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JP2007306237

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007306237
An object of the present invention is to reproduce high-quality sound by preventing deterioration
of sound quality caused by resonance of a diaphragm in a medium-high frequency range, and to
provide high-quality sound with a simple configuration without providing an unnecessary
configuration such as a balancer. Reproducing etc. A speaker device 100 includes a diaphragm 8
whose outer peripheral portion 8c is supported by a speaker frame, and a vibration source (voice
coil 5 and voice coil bobbin 4) joined to the diaphragm 8. , A reflection portion (rib 81) for
reflecting the propagation wave from the vibration source is provided along the circumferential
direction, and the distance from the bonding position of the vibration source and the diaphragm
(inner circumferential portion 8a) to the reflection portion is uneven in radiation direction The
reflective portion is formed to be [Selected figure] Figure 2
Speaker apparatus and speaker diaphragm
[0001]
The present invention relates to a speaker device and a speaker diaphragm.
[0002]
In a speaker device having a general conical (conical) diaphragm, the outer peripheral portion of
the diaphragm is vibratably supported by the speaker frame via the edge portion, and the inner
peripheral portion of the diaphragm is joined to the voice coil bobbin, A voice coil wound around
a voice coil bobbin is disposed so as to be freely oscillated between magnetic gaps of the
magnetic circuit.
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[0003]
In the speaker device of the above configuration, when an electric signal including an audio
signal is input to the voice coil, a driving force is generated in the voice coil by the
electromagnetic action to vibrate the voice coil, and the vibration is transmitted through the
voice coil bobbin and the joint portion. The vibration is transmitted to the diaphragm to vibrate,
and the diaphragm vibrates to vibrate an acoustic medium such as air around the diaphragm.
[0004]
The diaphragm generally vibrates in the low frequency range as a rigid body along the driving
direction, but in the middle high frequency range, the vibration propagation time from the
central portion to the periphery of the diaphragm can not be ignored and split resonance occurs.
This split resonance may cause dips or peaks in the frequency characteristics, and the sound
quality of the reproduced sound may be degraded.
For example, the cause is that the outer peripheral part of a general cone-shaped diaphragm and
the inner peripheral part (neck part) of the diaphragm are formed concentrically, and the length
of the generatrix along the outer peripheral part from the inner peripheral part Since the wave
length is formed in the same shape over the entire circumference, the occurrence of split
resonance unique to the diaphragm may be mentioned.
[0005]
For example, in the eccentric speaker disclosed in Patent Document 1, the deterioration of the
frequency characteristic due to the division resonance of the diaphragm is prevented by adopting
an eccentric cone diaphragm having a shape in which the center hole is eccentric.
[0006]
Patent No. 3405160 gazette
[0007]
As described above, in a general speaker, it is difficult to obtain good frequency characteristics in
a high frequency region due to the generation of standing waves of the diaphragm (split
resonance).
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[0008]
Further, in the eccentric speaker disclosed in Patent Document 1 described above, the division
resonance is reduced by adopting the eccentric cone-shaped diaphragm, but for example, rolling
phenomenon caused by weight imbalance in the circumferential direction of the eccentric coneshaped diaphragm. In order to reduce the occurrence of バ ラ ン サ, it is necessary to attach a
balancer separately to the surface of the cone.
[0009]
In addition, in the case of an eccentric speaker, since the central axis of the inner peripheral
portion of the eccentric cone-shaped diaphragm and the central axis of the outer peripheral
portion of the diaphragm are deviated, it is necessary to prepare a specially shaped speaker
frame is there.
Further, when assembling the eccentric cone-shaped diaphragm to the speaker frame, it was
necessary to perform positioning so that the respective eccentric directions match (directionality
management).
[0010]
The present invention takes an example of the problem to address such a problem.
That is, high quality sound can be reproduced by preventing deterioration of the sound quality
due to the resonance of the diaphragm in the medium high frequency range, and high quality
sound can be reproduced with a simple configuration without providing an unnecessary
configuration such as a balancer. It is an object of the present invention that the speaker device
having the above-mentioned characteristics can be manufactured by a simple process without
performing complicated assembly processes such as direction management.
[0011]
In order to achieve such an object, the present invention at least comprises the configurations
according to the following independent claims.
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[0012]
The invention according to claim 1 is a speaker device provided with a diaphragm having an
outer peripheral portion supported by a speaker frame, and a vibration source joined to the
diaphragm, wherein the vibration plate is formed from the vibration source. The reflection
portion is formed along the circumferential direction to reflect the propagation wave, and the
reflection portion is formed so that the distance from the joining position of the vibration source
and the diaphragm to the reflection portion is uneven in the radiation direction. It is
characterized by
[0013]
The invention according to claim 10 is a speaker diaphragm in which an outer peripheral portion
is supported by a speaker frame, and the diaphragm is a reflection portion that reflects a
propagation wave from a vibration source joined to the diaphragm. The reflecting portion is
formed along the circumferential direction, and the reflecting portion is formed so that the
distance from the joining position of the vibration source and the diaphragm to the reflecting
portion is uneven in the radiation direction.
It features.
[0014]
The invention according to claim 10 is a speaker diaphragm in which the outer peripheral
portion is vibratably supported by the speaker frame directly or indirectly, the diaphragm
including a rib, and a central axis of the rib is It is characterized in that it is formed to be offset
with respect to the central axis of the diaphragm.
[0015]
The invention according to claim 11 is a speaker diaphragm in which the outer peripheral
portion is supported by the speaker frame so as to be vibrated directly or indirectly, and the
central axis of the inner peripheral portion is the central axis of the outer peripheral portion. It is
characterized in that it is formed to be offset.
[0016]
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A speaker device according to an embodiment of the present invention is a speaker device
including a diaphragm having an outer peripheral portion supported by a speaker frame, and a
vibration source joined to the diaphragm, the diaphragm from the vibration source The reflection
portion is provided along the circumferential direction to reflect the propagation wave, and the
reflection portion is formed such that the distance from the joining position of the vibration
source and the diaphragm to the reflection portion is nonuniform in the radiation direction.
For example, the reflecting portion is the outer peripheral portion of the diaphragm, and the
central axis of the outer peripheral portion of the diaphragm is formed to be offset with respect
to the central axis of the inner peripheral portion of the diaphragm.
The reflection portion is an outer peripheral portion of the diaphragm, and the central axis of the
outer peripheral portion of the diaphragm is formed to be offset with respect to the central axis
of the inner peripheral portion of the diaphragm.
[0017]
In the speaker device of the above configuration, the distance from the joining position of the
vibration source and the diaphragm to the reflection portion is formed uneven in the radiation
direction, so the propagation wave from the vibration source is uneven due to the reflection
portion The reflection reduces the formation of a standing wave on the diaphragm.
That is, the resonance inherent to the diaphragm can be dispersed.
Therefore, it is possible to reproduce high quality sound by preventing the deterioration of the
sound quality caused by the resonance of the diaphragm in the middle high frequency region.
In addition, high-quality sound can be reproduced with a simple configuration without providing
an unnecessary configuration such as a balancer.
Moreover, the speaker device having the above-described characteristics can be manufactured by
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a simple process without performing a complicated assembly process such as directionality
management.
[0018]
Hereinafter, a speaker device and a diaphragm for a speaker according to an embodiment of the
present invention will be described with reference to the drawings.
[0019]
First Embodiment FIG. 1 is a view for explaining a speaker device 100 according to a first
embodiment of the present invention.
1 (A) is a top view of the speaker device 100, and FIG. 1 (B) is a cross-sectional view of the
speaker device 100 shown in FIG. 1 (A) along the line A-A. FIG. 2 is a diagram for explaining the
operation and effects of the speaker device 100 according to the first embodiment of the present
invention. Specifically, FIG. 2A is a top view of the speaker device shown in FIG. 1A, and FIG. 2B
is a line AA in the vicinity of the diaphragm of the speaker device shown in FIG. And FIG. FIG. 3A
is a top view of the speaker device 100j of the comparative example, and FIG. 3B is along the line
A-A near the diaphragm of the speaker device 100j of the comparative example shown in FIG. It
is an expanded sectional view.
[0020]
In each drawing, a central axis 800 of the speaker device 100 is taken as z axis, a predetermined
radial direction orthogonal to the central axis 800 as x axis, and a radial direction orthogonal to
the x axis and z axis as y axis. In each drawing, the sound output side of the diaphragm 8 is
referred to as the front side or the upper side, and the opposite side is referred to as the back
side, the back side, or the lower side.
[0021]
The speaker device 100 according to the first embodiment of the present invention is, as shown
in FIGS. 1 and 2, a pole portion 1a erected at the central portion of the speaker device 100, a
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base end 1b of the pole portion 1a, and a base end. A yoke 1 integrally formed with a bottom
yoke 1c extending radially outward from the portion 1b, and a permanent magnet disposed on
the flat surface portion 1d of the bottom yoke 1c and coaxially formed around the pole portion
1a And an annular magnet 2 made of an electromagnet or the like, and an annular plate 3
coaxially formed around the pole portion 1 a and disposed on the magnet 2. The magnetic circuit
101 includes the yoke 1, the magnet 2, and the plate 3. The magnetic circuit 101 forms a
magnetic gap 102 between the outer peripheral surface of the pole portion 1 a and the inner
peripheral surface of the plate 3.
[0022]
In the speaker device 100, the voice coil 5 wound around the lower portion of the voice coil
bobbin 4 is disposed in the magnetic gap 102 of the magnetic circuit 101. The voice coil bobbin
4 is vibrated along the central axis 800 (coincident with the central axis direction (z-axis
direction) of the pole portion 1 a) of the voice coil bobbin 4 by a damper member 6 such as a
spider, for example. It is supported by
[0023]
The voice coil 5 (voice coil bobbin 4) corresponds to an embodiment of the vibration source of
the present invention.
[0024]
In the vicinity of the upper end portion of the voice coil bobbin 4, the inner peripheral portion 8
a of the central opening 80 of the diaphragm 8 is joined.
Specifically, a cone neck portion 8 b is formed on the inner peripheral portion 8 a of the
diaphragm 8, and the cone neck portion 8 b is formed in a tubular shape along the outer surface
of the voice coil bobbin 4.
[0025]
In the diaphragm 8, a body 8d having a sloped surface with a half apex angle θ1 from the cone
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neck 8b to the central axis 800 is formed, and the outer periphery 8c of the diaphragm 8 is
directly or indirectly (for example, It is vibratably supported on the flat portion 7a of the frame 7
via the edge portion 9). A magnetic circuit 101 is fixed to the lower part of the frame 7. In the
present embodiment, the end of the frame 7 is fixed to the plate 3 of the magnetic circuit 101.
[0026]
Further, as shown in FIGS. 1 and 2, the central axis of the frame 7, the central axis of the voice
coil bobbin 4, the central axis 800 of the inner peripheral portion 8a of the diaphragm 8, and the
center of the cone neck 8b of the diaphragm 8 The axis and the central axis of the outer
peripheral portion 8c of the diaphragm 8 are formed on the same axis. That is, each is formed
concentrically.
[0027]
Further, a rib 81 is formed on the body portion 8d between the inner peripheral portion 8b and
the outer peripheral portion 8c of the diaphragm 8. The ribs 81 are formed along the
circumferential direction on the front surface side or the back surface side of the diaphragm 8,
and are formed in various prescribed shapes such as a convex shape, a concave shape, and a
wave shape in a radial direction cross sectional shape. The rib 81 changes, for example, the
stiffness and the internal loss of the diaphragm 8 and increases the strength of the diaphragm 8.
The rib 81 corresponds to an embodiment of the reflecting portion according to the present
invention, and also corresponds to an embodiment of the rib according to the present invention.
Details of the rib 81 will be described later.
[0028]
Next, the edge portion 9 will be described. The edge portion 9 is formed, for example, in an
annular shape, and is formed to move flexibly with respect to the movement of the diaphragm 8.
The diaphragm 8 has, for example, a function as an end of the acoustic vibration of the
diaphragm 8, a function of supporting the outer peripheral portion 8c of the diaphragm 8 and
holding it at a prescribed position, and a lateral movement of the diaphragm 8. It has a function
of braking, a function of shielding so that the sound wave of the sound radiation on the back
surface of the diaphragm 8 does not interfere with the sound wave on the front surface, and the
like.
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[0029]
The edge portion 9 has an inner bonding portion 91, an outer bonding portion 92, and a roll
portion 93, as shown in detail in FIGS. Further, in the edge portion 9, the inner circumferential
side joint portion 91, the outer circumferential side joint portion 92, and the roll portion 93 are
integrally formed in an annular shape. The inner bonding portion 91 is formed in an annular
shape, and is fixed to a bonding portion 8 e in the vicinity of the outer peripheral portion 8 c of
the diaphragm 8 with an adhesive or the like. For example, as shown to FIG. 4 (A), the inner
peripheral side junction part 91 of the edge part 9 may be adhered to the back side of the outer
peripheral part 8c vicinity of the diaphragm 8, and it shows to FIG. 4 (B). Thus, the inner
peripheral side bonding portion 91 of the edge portion 9 may be fixed to the front side in the
vicinity of the outer peripheral portion 8 c of the diaphragm 8. The outer peripheral side bonding
portion 92 is formed in an annular shape, and is fixed in the vicinity of the upper portion of the
frame 7 by an adhesive or the like. The roll portion 93 is provided between the inner peripheral
side joint portion 91 and the outer peripheral side joint portion 92, and is formed in various
shapes such as a convex shape, a concave shape, and a wave shape in the radial direction. It is
formed in a ring shape. In the edge portion 9 according to the present embodiment, the central
axes of the outer diameter 92a and the inner diameter 91a of the edge portion 9 and the central
axes of the outer diameter portion 93a and the inner diameter portion 93b of the roll portion 93
It is formed to be coaxial with the vibration direction of the voice coil bobbin 4). In the abovedescribed speaker device 100, the diaphragm 8 is supported by the frame 7 in a freely vibrating
manner via the edge portion 9, but the present invention is not limited to this. As in the case of a
fake edge, the edge portion and the diaphragm may be integrally formed of the same material.
[0030]
Moreover, in the speaker apparatus 100 mentioned above, although the center opening part 8a
was formed in the diaphragm 8, it is not restricted to this form. For example, the central opening
8 a may not be formed, and the voice coil 5 as a vibration source, the voice coil bobbin 4 with the
voice coil 5 wound (wound), etc. It should just be joined to the part.
[0031]
Further, in the present embodiment, a body portion 8d having a sloped surface portion with a
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half apex angle θ1 with respect to the central axis 800, a so-called flat cone, is adopted as the
diaphragm 8, but the present invention is not limited to this. As the diaphragm 8, for example,
various types of diaphragms such as a curved cone and a parabolic cone may be adopted.
[0032]
In the speaker device 100 having the above configuration, for example, when an electrical signal
including an audio signal is input to an external terminal (not shown) disposed in the frame 7, the
electrical signal is input from the external terminal via a tinsel wire (not shown). The voice is
input to the voice coil 5 and a driving force is generated in the voice coil 5 by the
electromagnetic action. By the driving force of the voice coil 5, as shown in FIG. 1 (B), the voice
coil bobbin 4 vibrates along the central axis 800 (in the z-axis direction in the figure). The
diaphragm 8 vibrates the diaphragm 8 via the upper end portion vicinity 4a of the voice coil
bobbin 4 joined to the inner peripheral portion 8b, and the diaphragm 8 vibrates to vibrate an
acoustic medium such as air around the diaphragm. Let
[0033]
Comparative Example Next, as a comparative example, a diaphragm 8 j in which a rib is
concentrically formed on a cone-shaped diaphragm will be described. As shown in FIGS. 3A and
3B, the cone-shaped diaphragm 8j has a plurality of ribs 81j (811j, 812j, 813j) along the
circumferential direction on the body of the diaphragm 8j. Is formed in a circular shape. The
diaphragm 8j is formed such that the central axis 800 of the diaphragm 8j and the central axis of
the rib 81j are located on the same axis. That is, they are formed concentrically. More
specifically, as shown in FIGS. 3A and 3B, the first rib 811 j has a radius r 811 j along the radial
direction from the central axis 800 (a prescribed direction orthogonal to the central axis 800, for
example, the x-axis). The second rib 812 j has a radius r 812 j, and the third rib 813 j has a
circular shape with a radius r 813 j. Also, for example, with reference to the inner peripheral
portion 8a of the diaphragm 8j, lengths (heights) h811j and h812j along the z-axis direction of
the first rib 811j, the second rib 812j, and the third rib 813j. , H 813 j are constant over the
entire circumference. In the diaphragm 8j configured as described above, as shown in FIGS. 3 (A)
and 3 (B), from the inner peripheral portion 8a (cone neck portion 8b) of the diaphragm 8j along
the inclined surface portion of the body portion of the diaphragm 8j. Since the distance to each
rib 81 j is uniform, a standing wave unique to the diaphragm 8 j is formed, and split resonance
occurs. For this reason, peak dip may occur in the middle and high frequency range of sound
pressure.
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[0034]
[Speaker Device 100 According to the Present Invention] Next, a reflecting portion or the like of
the diaphragm 8 which is a characterizing portion according to the present invention will be
described in detail with reference to the drawings.
[0035]
The speaker device 100 according to the first embodiment of the present invention has, for
example, a rib 81 formed along the circumferential direction as a reflection portion of the
diaphragm 8, and the rib 81 is a vibration source (the voice coil 5 is wound It is formed so that
the distance (length) from the inner circumferential portion 8b (joining position) of the
diaphragm 8 to which the mounted (wound) voice coil bobbin 4 is joined is uneven in the radial
direction from the rib 81 ing.
For example, the rib 81 may be formed such that the distance (length) from the bonding position
of the vibration source to the rib 81 is radial and at least a part of the entire circumference is
nonuniform.
[0036]
In detail, as shown in FIGS. 1 and 2 in the diaphragm 8, when a plurality of ribs 81 (811, 812,
813) are viewed from the front in the body portion 8d (for example, viewed from the + z axis
side) The central axis 800 of the diaphragm 8 and the central axis 810 of the circular rib 81 are
formed so as to be displaced from each other.
[0037]
Specifically, in the body portion 8 d of the diaphragm 8, the central axis 810 of the plurality of
ribs 81 j (811 j, 812 j, 813 j) is in a defined direction (for example, −x axis direction) with
respect to the central axis 800 of the diaphragm 8. Are formed offset by a prescribed distance
dL8.
In the present embodiment, the central axis 810 of the rib 81 and the central axis 800 of the
diaphragm 8 have a parallel positional relationship.
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[0038]
The first rib 811 j has a radius r811 along the radial direction (x-axis) from the central axis 810,
and the second rib 812 has a radius r812 along the radial direction (x-axis) from the central axis
810, and the third rib 813 Is formed to have a radius r813 along the radial direction (x-axis)
from the central axis 810.
[0039]
However, the distance d81 (d811, d812, d813) from the inner peripheral portion 8a of the
diaphragm 8 to the rib 81 (811, 812, 813) along the body portion 8d of the diaphragm 8
becomes uneven in the radial direction ing.
Specifically, the distance d81 (d811, d812, d813) from the inner peripheral portion 8a of the
diaphragm 8 to the rib 81 (811, 812, 813) along the radial direction of the body portion 8d of
the diaphragm 8 is The −x axis side is longer than the + x axis side.
[0040]
More specifically, for example, as shown in FIG. 2B, when viewed in plan from the + z-axis side,
the radial direction (-x-axis) from the central axis 800 of the diaphragm 8 to the first rib 81 The
length s 811 ′ along the radial direction (+ x axis) from the central axis 800 of the diaphragm 8
to the first rib 81 is shorter than the length s 81 along the length s 811. Further, from the central
axis 800 of the diaphragm 8 to a length s812 along the radial direction (−x axis) from the
second rib 82, the radial direction from the central axis 800 of the diaphragm 8 to the second rib
82 The length s812 'along the (+ x axis) is short. Further, from the central axis 800 of the
diaphragm 8 to a length s813 along the radial direction (-x axis) from the third rib 83, the radial
direction from the central axis 800 of the diaphragm 8 to the third rib 83 The length s813 'along
the (+ x axis) is short.
[0041]
Further, for example, as shown in FIG. 2B, when the inner peripheral portion 8a of the diaphragm
8 is used as a reference, the first rib 811, the second rib 812, and the third rib 813 along the zaxis direction The lengths (heights) h811, h812, and h813 are uneven.
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[0042]
Specifically, as shown in FIG. 2B, for example, when the inner peripheral portion 8a of the
diaphragm 8 is used as a reference, a length (height) h811 along the z-axis direction of the first
rib 811 Is longer on the −x axis side than on the + x axis side.
The length (height) h 812 along the z-axis direction of the second rib 812 is longer on the −xaxis side than on the + x-axis side. The length (height) h 813 along the z-axis direction of the
third rib 813 is longer on the −x-axis side than on the + x-axis side.
[0043]
As described above, in the speaker device 100 configured as described above, the distance d81
from the inner peripheral portion 8a of the diaphragm 8 to the rib 81 (811, 812, 813) along the
radiation direction of the body portion 8d of the diaphragm 8 Since (d 811, d 812, d 813) is
nonuniform, the rib 81 reflects the propagation wave of the diaphragm 8 nonuniformly, so that
the resonance unique to the diaphragm 8 can be dispersed. Therefore, it is possible to reproduce
high quality sound by preventing the deterioration of the sound quality caused by the resonance
of the diaphragm in the middle and high frequency range. That is, it is possible to obtain smooth
sound pressure frequency characteristics.
[0044]
In addition, the speaker device 100 according to the present invention can reproduce highquality sound with a simple configuration without providing an unnecessary configuration such
as a balancer as in the conventional eccentric speaker device.
[0045]
In the speaker device 100 according to the present embodiment, the central axis of the frame 7,
the central axis of the edge portion 9, the central axis of the voice coil bobbin 4, the central axis
800 of the inner peripheral portion 8 a of the diaphragm 8, and the cone. The central axis of the
neck portion 8b and the central axis of the outer peripheral portion 8c are formed on the same
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axis.
That is, each is formed concentrically. For example, in a conventional eccentric speaker device, it
is necessary to newly manufacture a speaker frame or a magnetic circuit having a special shape
corresponding to the eccentric cone diaphragm, and positioning in consideration of the eccentric
direction of the eccentric cone diaphragm during assembly, It is necessary to manage
directionality. On the other hand, as described above, in the speaker device 100 according to the
present invention, since the general concentric frame 7, the edge portion 9, the voice coil bobbin
4 and the magnetic circuit 101 can be used, the manufacturing cost is reduced. Can. Further,
since the inner peripheral portion 8a and the outer peripheral portion 8c of the diaphragm 8 are
formed concentrically, the speaker device 100 can be easily manufactured without performing
an extra process such as directionality management.
[0046]
Also, the rib 81 is not limited to the above embodiment. For example, as shown in FIG. 5A, the rib
81 may be formed in a hollow shape as well as a convex shape in the radial direction crosssectional shape toward the sound output side of the diaphragm 8. Further, as shown in FIG. 5 (B),
the rib 81 may be formed in a convex shape toward the sound output side and may be formed in
a medium density while being formed in a convex shape. Further, as shown in FIG. 5C, the rib 81
may be formed in a hollow shape while being formed in a convex shape in the radial direction in
cross section toward the rear surface side. Further, as shown in FIG. 5D, the rib 81 may be
formed so as to have a convex in the radial direction cross-sectional shape toward the back
surface side and a medium density.
[0047]
Moreover, although the rib 81 which concerns on the said embodiment was formed circularly in
the plain view from the sound emission side of the diaphragm 8, for example, the shape of the
plain view of this rib 81 is, for example with respect to the central axis of a rib It may be formed
concentrically in various shapes such as a substantially circular shape, a substantially elliptical
shape, a substantially triangular shape, a tetragonal shape, a polygonal shape and the like.
[0048]
Further, as described above, the central axis 810 of the rib 81 is formed to be offset with respect
to the central axis 800 of the diaphragm 8 as described above, but the direction and the size of
the offset of the central axis 810 of the rib are For example, it is appropriately set according to
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various conditions such as directivity and frequency characteristics.
[0049]
Also, as described above, the rib 81 is formed to deviate from the central axis 800 of the
diaphragm 8 by the specified distance dL8 toward the −x axis side, but the direction and the size
of the deviation depend on various conditions. It is preferable to set appropriately.
[0050]
First Specific Example FIGS. 6 and 7 are views for explaining another specific example of the rib
81 according to the present invention.
[0051]
FIGS. 6A and 6B are diagrams for explaining a diaphragm 8A according to a first example of the
present invention.
[0052]
In the above embodiment, the plurality of ribs 81 (811 to 813) are formed on the diaphragm 8,
and the central axes of the plurality of ribs 811 to 813 are formed to have the same size and
displacement amount, respectively. It is not limited to this form.
For example, in the ribs defined among the plurality of ribs, the magnitudes and directions of
deviations of central axes of the plurality of ribs may be different.
[0053]
For example, as shown in FIGS. 6A and 6B, the diaphragm 8A is provided with a plurality of ribs
81, and the direction and amount of displacement of each rib are different with respect to the
central axis 800 of the diaphragm 8. It may be formed in
[0054]
Specifically, the rib 81A according to the first specific example includes a first rib 811A, a second
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rib 812A, and a third rib 813A.
The first rib 811A is an innermost rib formed in a circular shape in plan view.
A central axis 8110A of the first rib 811A is formed to be shifted in the + x-axis direction by a
distance dL81a with respect to a central axis 800 of the diaphragm 8A.
The second rib 812A is formed in a circular shape in a plan view, and is formed on the outer side
of the first rib 811A, and the central axis 8120A of the second rib 812A corresponds to the
central axis 800 of the diaphragm 8A. In contrast, it is formed to be deviated in the + x-axis
direction by the distance dL 82a.
The third rib 813A is formed in a circular shape in plan view, and is the outermost rib formed
outside the second rib 812A.
The central axis 8130A of the third rib 813A is formed to be offset from the central axis 800 of
the diaphragm 8A by a distance dL 83a in the -x-axis direction.
[0055]
As described above, in the diaphragm 8A according to the first specific example, the ribs defined
among the plurality of ribs are formed so that the magnitudes and directions of deviations of the
central axes of the plurality of expected ribs are different. Because the distance from the inner
peripheral portion 8a of the diaphragm 8 to each rib along the body in the radial direction is
formed so that at least a part is uneven over the entire circumference, The resonance of the
standing wave inherent to the diaphragm can be dispersed more.
[0056]
Second Specific Example FIGS. 7A and 7B are views for explaining a diaphragm 8B according to a
second specific example of the present invention.
As shown in FIGS. 7A and 7B, the diaphragm 8B is provided with a plurality of ribs 81, and the
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direction and amount of displacement of each rib are different, and when viewed from the front,
the first and second The shape of the rib 811B is formed in a substantially elliptical shape.
[0057]
For example, the rib 81B according to the second specific example has a first rib 811B, a second
rib 812B, and a third rib 813B.
[0058]
The first rib 811B is an innermost rib formed in an elliptical shape in plan view.
The central axis 8110 B of the first rib 811 B is formed to be offset from the central axis 800 of
the diaphragm 8 by the distance dL 81 b in the −x axial direction and the −y axial direction.
[0059]
The second rib 812 B is formed in an elliptical shape in a plan view, and is formed outside the
first rib 811 B, and the central axis 8120 B of the second rib 812 B corresponds to the central
axis 800 of the diaphragm 8. It is formed to be offset in the −x-axis direction by the distance dL
82 b.
[0060]
The third rib 813B is formed in a circular shape in a plan view, and is the outermost rib formed
outside the second rib 812B.
The central axis 8130 B of the third rib 813 B is formed to be offset from the central axis 800 of
the diaphragm 8 in the −x-axis direction by the distance dL 83 b.
[0061]
As described above, in the diaphragm 8B according to the second specific example, the
magnitudes and directions of the displacements of the central axes of the ribs defined among the
plurality of ribs are different from each other, and are formed in an elliptical shape. At least a
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part of the distance from the inner circumferential portion 8a of the plate 8 to each rib along the
body in the radial direction is at least partially nonuniform over the entire circumference, and
resonance can be further dispersed.
[0062]
Second Embodiment FIG. 8 is a view for explaining a speaker device according to a second
embodiment of the present invention.
Specifically, FIG. 8A is a top view of the speaker device, and FIG. 8B is a cross-sectional view of
the speaker device shown in FIG. 8A along the line A-A. The description of the same
configuration and effects as those of the first embodiment will be omitted.
[0063]
In the speaker device 100C according to the present embodiment, as shown in FIGS. 8A and 8B,
in plan view from the + z-axis direction, the central axis 810c of the rib 81c is the central axis
800 of the conical diaphragm 8. The distance h (also referred to as the height) along the central
axis 800 from the inner peripheral portion 8a of the diaphragm 8 is constant. In detail, the size
of the projection of the rib 81c is formed such that at least a part of the entire circumference is
nonuniform.
[0064]
As shown in FIG. 8, the diaphragm 8C according to the present embodiment is provided with a
plurality of ribs 81C (811C, 812C). Specifically, in the diaphragm 8C, as shown in FIG. 8, the
central axis 810c of the rib 81C is formed offset from the central axis 800 of the diaphragm 8 in
the −x axis direction by a prescribed distance. Specifically, the size of the protrusion of the rib
811 CL on the side of the displacement direction (−x-axis direction) of the central axis 810 c of
the rib 81 with respect to the central axis 800 of the diaphragm 8 is the opposite direction to the
displacement (+ x-axis direction Smaller than the size of the protrusion of the rib 811CR on the
side).
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[0065]
Further, in the diaphragm 8C according to the present embodiment, the two ribs 811C and 812C
are formed to be the same central axis 810C.
[0066]
In the speaker 100C including the diaphragm 8C having the above configuration, for example,
when the voice coil bobbin 4 joined to the inner peripheral portion 8a vibrates, the vibration in
the middle to high frequency is directed from the inner peripheral portion 8a in the radial
direction And the size of the protrusion of the rib 81C is formed so that at least a part of the
entire circumference is uneven. Specifically, the size of the protrusion of the rib 81C is at least
one of the entire circumference. Since the portions are formed so as to be uneven, more
specifically, since the distance from the inner peripheral portion 8a to the tip end of the
projection of the rib 81C is different, for example, a conventional cone shape in which the rib is
formed concentrically Resonance is reduced compared to the diaphragm.
[0067]
As described above, in the diaphragm 8 of the speaker device 100 according to the present
embodiment, the size of the protrusion of the rib 81C is formed such that at least a part of the
entire circumference is nonuniform, so that Since the size of the protrusion of the rib 81C is
formed so that at least a part of the entire circumference is uneven, resonance is reduced, and
dips and peaks in the middle and high frequency range of the sound pressure frequency
characteristic Can be reduced.
[0068]
Third Specific Example FIG. 9 is a view for explaining a speaker device 100D according to a third
specific example of the present invention.
9A is a top view of the speaker device 100D, and FIG. 9B is a cross-sectional view of the speaker
device shown in FIG. 9A taken along the line A-A.
[0069]
In the diaphragm 8C according to the second embodiment, the central axes of the plurality of
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ribs 811C and 812C are formed to be offset from the central axis 800 of the diaphragm 8 by the
same amount in the same direction. It is not limited to the form.
The cone-shaped diaphragm may be provided with a plurality of ribs, and the displacement of the
central axis of at least one of the plurality of ribs may be different from the displacement of the
central axes of the other ribs.
Further, the directions and the magnitudes of the deviations of the central axes of the plurality of
ribs may be different.
[0070]
For example, as shown in FIGS. 9A and 9B, the speaker device 100D according to the third
specific example of the present invention has a plurality of substantially circular ribs in the
diaphragm 8D in plan view from the + z-axis direction. 81D (811D, 812D) is formed, and the
central axis 810D of the first rib 811D is formed offset from the central axis 800 of the
diaphragm 8 by the prescribed distance on the −x axis side, and the second axis The central axis
of the rib 812 D is formed to be substantially the same as the central axis of the conical
diaphragm 8.
[0071]
In the speaker device 100D having the above configuration, in the diaphragm 8D, the central axis
810D of one of the two ribs 811D and 812D with respect to the central axis 800 of the
diaphragm 8 defines a prescribed direction (for example, -x axis) And the center axis of the rib
812D is formed to be substantially the same as the center axis 800 of the diaphragm 8D.
[0072]
Further, in the speaker device 100D having the above configuration, only the central axis of one
of the two ribs is formed to be offset from the central axis of the diaphragm 8D, so this is
compared to the case where the ribs are simply provided concentrically. Since the distance from
the end of the rib 811D to the end of the rib 812D along the diaphragm is at least partially
nonuniform over the entire circumference, resonance inherent to the diaphragm is reduced.
For this reason, in the sound pressure frequency characteristics of the diaphragm, it is possible to
12-05-2019
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reduce the peak dip in the middle high frequency region.
[0073]
Fourth Specific Example FIG. 10 is a view for explaining a speaker device 100E according to a
fourth specific example of the present invention.
10 (A) is a top view of the speaker device 100D, and FIG. 10 (B) is a cross-sectional view of the
speaker device 100E shown in FIG. 10 (A) along the line A-A. The description of the same
configuration and effects as those of the embodiment and the specific example described above
will be omitted.
[0074]
The speaker device 100E according to the fourth example has a plurality of ribs 81E (811E,
812E, 813E) on the diaphragm 8E as shown in FIGS. 10 (A) and 10 (B), and each of the ribs
811E-813E The central axis 810E is formed to deviate by a prescribed distance along the
prescribed direction (−x-axis direction).
[0075]
In the speaker device 100E configured as described above, since the diaphragm 8E is provided
with three ribs 811E to 813E having uneven rib sizes, resonance unique to the diaphragm can be
obtained as compared to the case where two ribs are simply provided. It can be further reduced.
Further, by providing the diaphragm 8E with a plurality of three or more ribs, the resonance
unique to the diaphragm can be further reduced.
[0076]
Fifth Specific Example FIG. 11 is a view for explaining a speaker device 100F according to a fifth
specific example of the present invention. 11A is a top view of the speaker device 100F, and FIG.
11B is a cross-sectional view of the speaker device 100F shown in FIG. 11A along the line A-A.
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21
The description of the same configuration and effects as those of the embodiment and the
specific example described above will be omitted.
[0077]
The speaker device 100F according to the fifth example has a plurality of ribs 81F (811F, 812F)
on the diaphragm 8F as shown in FIGS. 11A and 11B, and central axes of the ribs 811F and
812F. , And 810F are formed so as to be deviated by a prescribed distance along the prescribed
direction (−x-axis direction).
[0078]
The rib 81F according to this specific example is formed to have a sharp projection as compared
to the above-described embodiment.
Specifically, the rib 81F is formed in a polygonal shape such as a triangular shape in cross
section in the radial direction.
[0079]
In the above speaker device 100F, since the diaphragm 8 has the sharply projecting rib 81F, for
example, by forming the rib in a desired projecting shape, desired frequency characteristics and
directivity can be easily obtained. In addition, the resonance of the diaphragm 8 can be reduced.
[0080]
Sixth Specific Example FIG. 12 is a view for explaining a speaker device 100G according to a sixth
specific example of the present invention. More specifically, FIG. 12A is a top view of the speaker
device 100G, and FIG. 12B is a cross-sectional view of the speaker device 100G shown in FIG.
12A along the line A-A. The description of the same configuration and effects as those of the
embodiment and the specific example described above will be omitted.
[0081]
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22
The speaker device 100G according to the sixth specific example has a plurality of ribs 81G
(811G, 812G) on the diaphragm 8G, and as shown in FIG. 12A, it has a substantially elliptical
shape when viewed in front from the + z-axis direction For example, the major axis is formed
along a prescribed direction (for example, the x-axis direction), the minor axis is formed along the
y-axis direction, and the respective centers of gravity 810G of the ribs 811G and 812G As shown
in FIG. 12 (B), the distance from the inner circumferential portion 8a of the diaphragm 8G along
the z-axis direction is formed, as shown in FIG. It is formed in the shape where (height) becomes
substantially the same.
[0082]
In the diaphragm 8G according to this specific example, the inner peripheral portion 8a is formed
in a circular shape centering on the central axis 800 when viewed in plan from the + z-axis
direction, and the outer peripheral portion 8c is formed in a substantially elliptical shape The
long axis is formed along the defined direction (for example, the x-axis direction).
Further, as shown in FIGS. 12A and 12B, the center of gravity 800G of the outer peripheral
portion 8c may be formed off the central axis 800 of the inner peripheral portion 8a, or may be
formed on the central axis 800. It is also good.
[0083]
Moreover, although the outer peripheral part 8c of the diaphragm 8G mentioned above was
formed in substantially elliptical shape, you may form in circular shape and may be formed in
various shapes.
[0084]
In the speaker device 100G configured as described above, the elliptical rib 81G is provided on
the cone-shaped diaphragm 8G whose outer peripheral portion 8c is substantially elliptical,
whereby the distance from the inner peripheral portion 8a of the diaphragm 8G to the rib 81G,
and details Since the distance to the tip of the projection of the rib 81G is not uniform at least in
part of the entire circumference, resonance inherent in the diaphragm 8G can be reduced.
Further, the magnitude and the direction of the displacement of the center of gravity of the rib
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81G are not limited to the above specific example, and can be set according to various conditions.
[0085]
Seventh Specific Example FIG. 13 is a view for explaining a speaker device 100H according to a
seventh specific example of the present invention. 13A is a top view of the speaker device 100H,
and FIG. 13B is a cross-sectional view of the speaker device 100H shown in FIG. 13A along the
line A-A. The description of the same configuration and effects as those of the embodiment and
the specific example described above will be omitted.
[0086]
In the speaker device 100H according to the seventh example, as shown in FIGS. 13A and 13B,
the projection of the rib 81H formed on the diaphragm 8H has a round corner shape as
compared with the sixth example. It is formed.
[0087]
In the speaker device 100H having the above configuration, as compared to the sixth example,
the rib 81H having the above shape is formed on the diaphragm 8H, so the distance from the
inner circumferential portion 8a of the diaphragm 8H to the rib 81H is detailed. Since the
distance to the tip of the projection of the rib 81H becomes long and at least a part of the entire
circumference becomes nonuniform, resonance inherent in the diaphragm 8H can be reduced.
[0088]
Third Embodiment FIG. 14 is a view for explaining a speaker device 100K according to a third
embodiment of the present invention.
In detail, FIG. 14A is a top view of the speaker device 100K, and FIG. 14B is a cross-sectional
view of the speaker device 100K shown in FIG. 14A along the line A-A.
FIG. 15 is a diagram for explaining the operation and effects of the speaker device 100K
according to the third embodiment of the present invention. 15 (A) is a top view of the speaker
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24
device 100K shown in FIG. 14 (A), and FIG. 15 (B) is an A- diagram near the diaphragm of the
speaker device 100K shown in FIG. 15 (A). It is an expanded sectional view along A line. FIG. 16
(A) is a top view of the speaker device 100J of the comparative example, and FIG. 16 (B) is along
the line A-A near the diaphragm of the speaker device 100j of the comparative example shown in
FIG. FIG.
[0089]
In each drawing, a central axis 800 of the speaker device 100K is taken as z axis, a
predetermined radial direction orthogonal to the central axis 800 as x axis, and a radial direction
orthogonal to the x axis and z axis as y axis. In each drawing, the sound output side of the
diaphragm is referred to as the front side or the upper side, and the opposite side is referred to
as the back side, the back side or the lower side.
[0090]
The speaker device 100K according to the third embodiment of the present invention, as shown
in FIGS. 14 and 15, includes a pole portion 1a erected at the central portion of the speaker device
100K, and a base end portion and a base end portion of the pole portion 1a. A yoke 1 integrally
formed with a bottom yoke 1c extending radially outward from 1b, and a permanent magnet
disposed on a flat surface portion 1d of the bottom yoke 1c and coaxially formed around the pole
portion 1a, for example It has an annular magnet 2 made of an electromagnet or the like, and an
annular plate 3 coaxially formed around the pole portion 1 a and disposed on the magnet 2. The
magnetic circuit 101 includes the yoke 1, the magnet 2, and the plate 3. The magnetic circuit
101 forms a magnetic gap 102 between the outer peripheral surface of the pole portion 1 a and
the inner peripheral surface of the plate 3.
[0091]
Further, in the speaker device 100K, the voice coil 5 wound around the lower portion of the
voice coil bobbin 4 is disposed in the magnetic gap 102 of the magnetic circuit 101. The voice
coil bobbin 4 is vibrated along the central axis 800 (coincident with the central axis direction (zaxis direction) of the pole portion 1 a) of the voice coil bobbin 4 by a damper member 6 such as
a spider, for example. It is supported by
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[0092]
In the vicinity of the upper end portion of the voice coil bobbin 4, an inner peripheral portion 8a
of a central opening 80 of the diaphragm 8K is joined. Specifically, a cone neck portion 8 b is
formed on the inner peripheral portion 8 a of the diaphragm 8, and the cone neck portion 8 b is
formed in a tubular shape along the outer surface of the voice coil bobbin 4.
[0093]
In the diaphragm 8K, a body portion 8d including a sloped surface having a half apex angle θ1
with respect to the central axis 800 from the cone neck 8b is formed, and the outer periphery 8c
of the diaphragm 8K is directly or indirectly (for example, an edge) Through the portion 9) on the
flat portion 7a of the frame 7. A magnetic circuit 101 is fixed to the lower part of the frame 7. In
the present embodiment, the end of the frame 7 is fixed to the plate 3 of the magnetic circuit
101.
[0094]
As shown in FIGS. 14 and 15, the central axis of the frame 7, the central axis of the voice coil
bobbin 4, the central axis 800 of the inner peripheral portion 8a of the diaphragm 8, and the
central axis of the cone neck 8b are the same. It is formed to be positioned on the axis. That is,
each is formed concentrically.
[0095]
Next, the edge portion 9 will be described. The edge portion 9 is formed, for example, in an
annular shape, and is formed to move flexibly with respect to the movement of the diaphragm 8.
The diaphragm 8 has, for example, a function as an end of the acoustic vibration of the
diaphragm 8, a function of supporting the outer peripheral portion 8c of the diaphragm 8 and
holding it at a prescribed position, and a lateral movement of the diaphragm 8. It has a function
of braking, a function of shielding so that the sound wave of the sound radiation on the back
surface of the diaphragm 8 does not interfere with the sound wave on the front surface.
12-05-2019
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[0096]
The edge portion 9 has an inner bonding portion 91, an outer bonding portion 92, and a roll
portion 93, as shown in detail in FIGS. Further, in the edge portion 9, the inner circumferential
side joint portion 91, the outer circumferential side joint portion 92, and the roll portion 93 are
integrally formed in an annular shape. The roll unit 93 corresponds to an embodiment of the
deformable unit according to the present invention. The inner bonding portion 91 is formed in an
annular shape, and is fixed to a bonding portion 8 e in the vicinity of the outer peripheral portion
8 c of the diaphragm 8 with an adhesive or the like. As described above, for example, as shown in
FIG. 4A, the inner peripheral side bonding portion 91 of the edge portion 9 may be fixed to the
back surface near the outer peripheral portion 8c of the diaphragm 8; As shown in B), the inner
peripheral side bonding portion 91 of the edge portion 9 may be fixed to the front side in the
vicinity of the outer peripheral portion 8 c of the diaphragm 8. The outer peripheral side bonding
portion 92 is formed in an annular shape, and is fixed in the vicinity of the upper portion of the
frame 7 by an adhesive or the like. The roll portion 93 is provided between the inner peripheral
side joint portion 91 and the outer peripheral side joint portion 92, and is formed in various
shapes such as a convex shape, a concave shape, and a wave shape in the radial direction. It is
formed in a ring shape. In the edge portion 9 according to the present embodiment, the central
axes of the outer diameter 92a and the inner diameter 91a of the edge portion 9 and the central
axes of the outer diameter portion 93a and the inner diameter portion 93b of the roll portion 93
It is formed to be coaxial with the vibration direction of the voice coil bobbin 4).
[0097]
In the above-described speaker device 100K, the central opening 8a is formed in the diaphragm
8K, but the present invention is not limited to this. For example, the central opening 8a may not
be formed, and the voice coil 5 as a vibration source, the voice coil bobbin 4 with the voice coil 5
wound (wound), etc. are joined to the central portion of the diaphragm 8K. It should just be.
[0098]
Further, in the present embodiment, a body portion 8d having a sloped surface portion with a
half apex angle θ1 with respect to the central axis 800, a so-called flat cone, is adopted as the
diaphragm 8K. For example, various shapes such as a curved cone and a parabolic cone may be
adopted as the diaphragm 8K.
12-05-2019
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[0099]
In the speaker device 100K having the above configuration, for example, when an electrical
signal including an audio signal is input to an external terminal (not shown) disposed in the
frame 7, the electrical signal is input from the external terminal via a tinsel wire (not shown) The
voice is input to the voice coil 5 and a driving force is generated in the voice coil 5 by the
electromagnetic action. By the driving force of the voice coil 5, as shown in FIG. 14B, the voice
coil bobbin 4 vibrates along the central axis 800 (in the z-axis direction in the figure). The
diaphragm 8K vibrates the diaphragm 8K via the upper end portion vicinity 4a of the voice coil
bobbin 4 joined to the inner circumferential portion 8b, and the diaphragm 8K vibrates to vibrate
an acoustic medium such as air around the diaphragm. Let
[0100]
Comparative Example Next, as a comparative example, a diaphragm 8J in which the inner
circumferential portion 8a and the outer circumferential portion 8c are concentrically formed
will be described. The diaphragm 8J as a comparative example is, as shown in FIGS. 16A and
16B, a central axis 800 of the diaphragm 8J, a central axis of the inner peripheral portion 8a, a
central axis of the outer peripheral portion 8c, and an edge The central axis of the portion 9 is
formed on the same axis. In the diaphragm 8J configured as described above, as shown in FIGS.
16A and 16B, the distance from the inner peripheral portion 8a of the diaphragm 8J to the outer
peripheral portion 8c along the inclined surface portion of the body portion of the diaphragm 8J.
d8 j is uniform over the entire circumference. Specifically, the outer peripheral portion 8c of the
diaphragm 8J is formed in a circular shape having a radius r8J along the radial direction (x-axis)
from the central axis 800. Further, for example, when based on the inner peripheral portion 8a of
the diaphragm 8j, the length (height) h8J along the z-axis direction up to the outer peripheral
portion 8c of the diaphragm 8J is constant over the entire periphery. There is. In the diaphragm
8J configured as described above, the distance d8j from the inner peripheral portion 8a of the
diaphragm 8J to the outer peripheral portion 8c along the inclined surface of the body of the
diaphragm 8J is uniform over the entire periphery. A standing wave unique to 8J is formed. For
this reason, peak dip may occur in the middle and high frequency range.
[0101]
[Speaker 100 K According to the Present Invention] Next, a reflecting portion and the like of the
diaphragm 8 K which is a characterizing portion according to the present invention will be
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described in detail with reference to the drawings.
[0102]
The speaker device 100K according to the third embodiment of the present invention includes a
reflection portion for dispersing the standing wave of the diaphragm 8, and as this reflection
portion, a vibration source (voice in which the voice coil 5 is wound (wound)) The distance from
the inner circumferential portion 8b (joining position) of the diaphragm 8 to which the coil
bobbin 4 is joined is made uneven in the radial direction at the outer circumferential portion 8c
of the diaphragm.
[0103]
Specifically, as shown in FIG. 14 and FIG. 15, the inner peripheral portion 8a is formed in a
circular shape on the diaphragm 8 when viewed from the front (for example, when viewed from
the + z axis side). Is formed in a substantially circular shape, and a position where the central axis
800 of the diaphragm 8 (the same axis as the central axis of the inner peripheral portion 8a and
the central axis of the voice coil bobbin 4) is offset from the central axis 810K of the outer
peripheral portion 8c. It is formed to be in a relationship.
Specifically, the central axis 800 of the diaphragm 8 and the central axis 810K of the outer
peripheral portion 8c are parallel to each other with a predetermined distance therebetween in
the predetermined direction.
[0104]
Specifically, as shown in FIGS. 15A and 15B, the distance r8 from the central axis 800 to the
outer peripheral portion 8c along the radial direction (the prescribed direction orthogonal to the
central axis 800, for example, the x-axis direction) is At least a part of the entire circumference of
the outer peripheral portion 8c is uneven.
Specifically, of the distance r8 from the central axis 800 to the outer peripheral portion 8c in the
radial direction, the outer peripheral portion 8c is formed so as to have a minimum distance r8R
on the + x axis and a maximum distance r8L on the -x axis. There is.
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[0105]
Further, as shown in FIGS. 15A and 15B, the distance s8 from the central axis 810K of the outer
peripheral portion to the outer peripheral portion 8c along the radial direction (a prescribed
direction orthogonal to the central axis 800, for example, the x-axis direction) is , The same
distance over the entire circumference.
[0106]
Further, as shown in FIG. 15B, when the inner peripheral portion 8a (cone neck portion 8b) of
the diaphragm 8 is used as a reference, the z axis (the central axis 800 of the diaphragm 8K and
the central axis of the voice coil bobbin 4) The length (height) h8 to the outer peripheral portion
8c along the) is at least partially nonuniform along the entire periphery of the outer peripheral
portion 8c.
In detail, for example, with reference to the inner peripheral portion 8a (cone neck portion 8b) of
the diaphragm 8, the outer peripheral portion 8c along the z axis (the central axis 800 of the
diaphragm 8K and the central axis of the voice coil bobbin 4). The length (height) h8 up to + x is
smaller than the height h8L on the + x-axis side than the height h8L on the −x-axis side.
[0107]
The speaker device 100K configured as above emits radiation along the body portion 8d of the
diaphragm 8K from the inner peripheral portion 8a (corn neck portion 8b) to which the voice
coil bobbin 4 on which the voice coil 5 serving as a vibration source is wound is joined. In the
direction, the distance d8 to the outer peripheral portion 8c of the diaphragm 8K is uneven,
specifically, from the inner peripheral portion 8a of the diaphragm 8K to the radial direction
along the body portion 8d of the diaphragm 8K The distance d8 to the outer peripheral portion
8c is the minimum distance d8R on the + x axis side, and is the maximum distance d8L on the
−x axis side.
[0108]
In the diaphragm 8K having the above-described configuration, the outer peripheral portion 8c
of the diaphragm 8K is bonded to the inner peripheral side bonding portion 91 of the edge
portion 9 through, for example, an adhesive or the like. As shown to B), the area of joining of the
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outer peripheral part 8c and the inner peripheral side junction part 91 becomes non-uniform
along the circumferential direction.
For example, the bonding area of the outer peripheral portion 8 c and the inner peripheral side
bonding portion 91 is set larger on the −x axis side than on the + x axis side.
[0109]
The shape is not limited to the shape of the edge portion 9 of the above configuration, and for
example, the bonding area between the outer peripheral portion 8 c of the diaphragm 8 K and
the inner peripheral side bonding portion 91 of the edge portion 9 is uniform over the entire
circumference. The inner peripheral shape of the inner peripheral side bonding portion 91 of the
edge portion 9 may be formed in accordance with the shape of the outer peripheral portion 8c of
the diaphragm 8K.
[0110]
[Frequency Characteristics of Sound Pressure] In order to confirm the performance of the
speaker device 100K according to the third embodiment of the present invention, the inventor of
the present invention compares the speaker device 100K shown in FIG. 14 with that shown in
FIG. The frequency characteristics of the speaker device 100J were measured, and the respective
frequency characteristics were compared.
[0111]
FIG. 17 shows the frequency characteristic (solid line) of the sound pressure level of the
reproduced sound of the speaker device 100K according to the third embodiment of the present
invention shown in FIG. 14 and the reproduction of the speaker device 100J as a comparison
object shown in FIG. It is a figure which shows the frequency characteristic (broken line) of the
sound pressure level of a benefit.
[0112]
[Speaker Device 100J to be Compared] As shown in FIG. 17, in the speaker device 100J, peak dip
was measured in a middle high frequency region (for example, a frequency of about 1 kHz or
more).
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Specifically, the dip in the sound pressure level was measured at about 4 kHz, the peak was
measured at about 5 kHz, the dip was measured at about 6 kHz, and the peak was measured at
about 7 kHz.
The peak dip in the middle high frequency region is one of the factors of the split resonance
inherent to the diaphragm 8J.
[0113]
[Speaker Device 100K According to the Present Invention] On the other hand, in the speaker
device 100K according to the present invention, as shown in FIG. 17, the peak dip in the middle
high frequency region is reduced compared to the speaker device 100J.
In detail, the peak of about 5 kHz was reduced, the degree of dip of about 6 kHz was reduced,
and the peak of about 7 kHz was reduced, and measurement results of smooth frequency
characteristics were obtained. That is, in the speaker device 100K, the distance from the inner
peripheral portion 8a of the diaphragm 8K to the outer peripheral portion 8c of the diaphragm
8K serving as the boundary condition is formed such that at least a part of the entire periphery
becomes uneven. Therefore, as a result of dispersion of the resonance of the diaphragm 8K, it
was possible to confirm that the peak dip in the middle high frequency region of the reproduced
sound is reduced.
[0114]
As described above, in the speaker device 100K according to the present embodiment, from the
inner peripheral portion 8a (cone neck portion 8b, bonding position) to which the voice coil
bobbin 4 on which the voice coil 5 serving as the vibration source is wound is bonded. Since the
distance d8 to the outer peripheral portion 8c of the diaphragm 8K is nonuniform in the radial
direction along the body portion 8d of the diaphragm 8K, the propagation wave from the joining
position is reflected nonuniformly at the outer peripheral portion The formation of the standing
wave of the diaphragm 8K can be reduced. That is, the resonance inherent in the diaphragm 8K
can be dispersed. Therefore, it is possible to reproduce high quality sound by preventing the
deterioration of the sound quality caused by the resonance of the diaphragm in the middle and
high frequency range. That is, the frequency characteristic of the sound pressure level of the
smooth reproduction sound can be obtained.
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[0115]
In the speaker device 100K according to the present embodiment, the central axis of the frame 7,
the central axis of the edge portion 9, the central axis of the voice coil bobbin 4, the central axis
800 of the inner peripheral portion 8a of the diaphragm 8K, and the cone neck It is formed so
that the central axis of the part 8b may be located on the same axis. That is, each is formed
concentrically. For this reason, in the speaker device 100K, since the general concentric frame 7,
the edge portion 9, the voice coil bobbin 4 and the magnetic circuit 101 can be used, the
manufacturing cost can be reduced.
[0116]
Further, in the conventional eccentric speaker device, it is necessary to newly manufacture a
speaker frame or a magnetic circuit having a special shape corresponding to the eccentric coneshaped diaphragm, and positioning in consideration of the eccentric direction of the eccentric
cone-shaped diaphragm during assembly Although it is necessary to perform directionality
management, in the present invention, the speaker device 100K can be easily manufactured
without performing extra steps such as directionality management.
[0117]
That is, since the half apex angle θ1 of the cone-shaped diaphragm 8K is formed the same over
the entire circumference, there is no difference in directivity due to the circumferential
attachment direction, and therefore there is no restriction in the attachment direction.
[0118]
In the said 3rd Embodiment, although the outer peripheral part 8c of the diaphragm 8K was
formed in substantially circular shape, when it was plainly viewed from + z axial direction, it is
not restricted to this form.
For example, the outer peripheral portion 8c of the diaphragm 8K may be formed in a
substantially elliptical shape when viewed from the front in the + z-axis direction.
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33
[0119]
The outer diameter of the outer peripheral portion 8c of the diaphragm 8L may be substantially
polygonal.
At this time, the center of gravity (central axis) of the outer diameter shape of the outer
peripheral portion 8c of the diaphragm is formed in a prescribed direction by shifting from the
central axis 800 of the voice coil bobbin 4, frame 7, edge portion 9 and the like. The distance
from the inner peripheral portion 8a to the outer peripheral portion 8c becomes uneven along
the radiation direction of the body portion 8d, so that resonance can be further reduced, and
high-quality sound can be reproduced.
[0120]
Eighth Specific Example FIG. 18 is a top view for illustrating a diaphragm 8L of a speaker device
100L according to an eighth specific example of the present invention. Descriptions of
configurations and effects similar to those of the other embodiments will be omitted.
[0121]
For example, as shown in FIG. 18, in the loudspeaker device 100L according to the eighth
specific example, the outer diameter of the outer peripheral portion 8c of the diaphragm 8L is
formed in a substantially polygonal shape, specifically in a substantially pentagonal shape. The
center of gravity 810L of the outer peripheral shape (substantially pentagonal shape) of the
outer peripheral portion 8c of the diaphragm 8L is defined in a specified direction with respect
to the central axis 800 of the diaphragm 8 (the central axis of the inner peripheral portion 8a or
the voice coil bobbin 4) It has become the positional relationship which shifted only.
[0122]
In the speaker device 100L configured as described above, since the distance from the inner
peripheral portion 8a to the outer peripheral portion 8c of the diaphragm 8L is uneven in the
radiation direction, resonance inherent to the diaphragm can be reduced. Therefore, high-quality
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sound can be reproduced.
[0123]
Fourth Embodiment FIG. 19 is a view for explaining a speaker device 100M according to a fourth
embodiment of the present invention. More specifically, FIG. 19A is a top view of the speaker
device 100M, and FIG. 19B is a cross-sectional view of the speaker device 100M shown in FIG.
19A along the line A-A. The description of the same configuration and effects as those of the
embodiment and the specific example described above will be omitted.
[0124]
In the speaker device 100M according to this embodiment, as shown in FIG. 19, the central axis
(center of gravity) 810M of the body portion d of the diaphragm 8M is the central axis 800 of
the diaphragm 8M, and more specifically, the inner periphery of the diaphragm 8M. It is
characterized in that it is formed offset with respect to the central axis 800 of the portion 8a.
Further, in the diaphragm 8M according to the present embodiment, the central axis of the outer
peripheral portion 8c and the central axis 800 of the inner peripheral portion 8a of the
diaphragm 8M coincide with each other.
[0125]
In the speaker device 100M, as shown in detail in FIGS. 19A and 19B, when the cross section of
the body portion 8d of the diaphragm 8M is taken along a plane orthogonal to the central axis
800, the diaphragm Diaphragm 8M is formed in a shape in which the center of gravity 810M of
the outer diameter shape of body portion 8d of 8M is shifted by a prescribed distance in a
prescribed direction with respect to central axis 800 of inner circumferential portion 8a or outer
circumferential portion 8c of diaphragm 8M. ing.
[0126]
Specifically, as shown in FIGS. 19A and 19B, for example, on the central axis 800 of the
diaphragm 8M (the central axes of the inner peripheral portion 8a and the outer peripheral
portion 8c), at the point a, the central axis 800 When the cross section is taken on a plane
orthogonal to the above, the outer peripheral portion 8c is included in the cross section.
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[0127]
The center of gravity 810Ma of the cross-sectional outer diameter shape of the body portion 8d
by the plane including the point a and orthogonal to the central axis 800 coincides with the
central axis 800.
[0128]
The center of gravity 810Mb of the cross-sectional outer diameter shape of the body portion 8d
by a plane including the point b and orthogonal to the central axis 800 is deviated by a
prescribed distance in a prescribed direction (for example, the x-axis direction).
[0129]
Similarly, the center of gravity 810Mc, the center of gravity 810Md, and the center of gravity
810Me of the cross-sectional outer diameter shape of the body portion 8d are similarly formed
by being deviated from the center axis 800 by a prescribed distance. Be done.
[0130]
The center of gravity 810Mf of the cross-sectional outer diameter shape of the body portion 8d
by the plane including the point f and orthogonal to the central axis 800 coincides with the
central axis 800.
[0131]
That is, in the diaphragm 8M of the above configuration, as shown in FIGS. 19A and 19B, in the
outer peripheral portion 8c, the center of gravity 800Ma of the cross-sectional outer diameter
shape by the plane orthogonal to the central axis 800 In the inner peripheral portion 8a, the
center of gravity 810Mf of the cross-sectional outer diameter shape matches the central axis.
On the other hand, in the body portion 8d between the inner peripheral portion 8a and the outer
peripheral portion 8c, at least a part of the center of gravity 810M of the cross-sectional outer
diameter shape is formed offset from the central axis 800 by a plane orthogonal to the central
axis 800.
[0132]
In the speaker device 100M configured as described above, since the distance from the inner
12-05-2019
36
circumferential portion 8a of the diaphragm 8M to the outer circumferential portion 8c along the
body portion 8d is nonuniform over the entire circumference, the resonance of the diaphragm
8M is dispersed , The peak dip in the high frequency region can be reduced.
[0133]
Further, in the speaker device 100M configured as described above, the central axis of the edge
portion 9, the central axis 800 of the inner peripheral portion 8a of the diaphragm 8, the central
axis of the cone neck portion 8b, and the central axis of the outer peripheral portion 8c are the
same. It is formed to be positioned on the axis.
That is, since each of them is formed concentrically, a general concentric edge portion 9, a
magnetic circuit 101, etc. can be used, so that the manufacturing cost can be reduced.
Further, since the inner peripheral portion 8a and the outer peripheral portion 8c of the
diaphragm 8M are formed concentrically, the speaker device 100M can be easily manufactured
without performing an extra process such as directionality management.
[0134]
As described above, in the speaker device according to the present invention, the cone-shaped
diaphragm 8 whose outer peripheral portion 8c is supported by the speaker frame, and the
vibration source joined to the diaphragm 8 (voice coil 5, voice coil bobbin 4) And the diaphragm
8 is provided along the circumferential direction with a reflection portion (rib 81 and the outer
peripheral portion 8c) for reflecting the propagation wave from the vibration source, and a
bonding position of the vibration source and the diaphragm (inner peripheral portion 8a) Since
the reflection part is formed so that the distance from the reflection part to the reflection part
becomes uneven in the radiation direction, the formation of the standing wave inherent to the
cone-shaped diaphragm is reduced, and the peak dip of the high-pass characteristic Can be
reduced, and high quality reproduced sound can be generated.
[0135]
Further, by reducing the peak dip in the high frequency region, the frequency characteristic (f
characteristic) can be obtained, and high quality reproduction sound can be generated.
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[0136]
In addition, with a diaphragm (oblique cone) or the like in which the conventional cone neck is
shifted from the center of the cone, it is necessary to prepare a special frame at the time of
incorporating the speaker and to manage the directionality of the cone. In this case, it can be
easily manufactured using a general concentric frame, a magnetic circuit, a voice coil bobbin, an
edge portion, a speaker frame and the like.
[0137]
Further, in the speaker device according to the present invention, high-quality sound can be
reproduced with a simple configuration without providing an unnecessary configuration such as
a balancer.
[0138]
The present invention is not limited to the embodiment described above.
You may combine the embodiment and the example which were mentioned above.
The shape of the diaphragm is not limited to the circular cone shape.
[0139]
It is a figure for demonstrating the speaker apparatus 100 which concerns on 1st Embodiment of
this invention.
(A) is a top view of the speaker apparatus 100, (B) is a cross-sectional view along the line A-A of
the speaker apparatus 100 shown in (A).
It is a figure for demonstrating the operation | movement and effect of the speaker apparatus
100 which concern on 1st Embodiment of this invention.
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(A) is a top view of the speaker apparatus shown to FIG. 1 (A), (B) is the expanded sectional view
along the AA line of diaphragm part vicinity of the speaker apparatus shown to (A).
(A) is a top view of the speaker device 100j of the comparative example, and (B) is an enlarged
cross-sectional view along the line A-A near the diaphragm of the speaker device 100j of the
comparative example shown in (A).
(A), (B) is a figure for demonstrating the joining form of the diaphragm 8 and the edge part 9.
FIG.
(A)-(D) are sectional drawings for demonstrating the modification of a rib. (A), (B) is a figure for
demonstrating the diaphragm 8A which concerns on the 1st example of this invention. (A), (B) is
a figure for demonstrating the diaphragm 8B which concerns on the 2nd example of this
invention. It is a figure for demonstrating the speaker apparatus which concerns on 2nd
Embodiment of this invention. FIG. 8A is a top view of the speaker device, and FIG. 8B is a crosssectional view along the line A-A of the speaker device shown in FIG. It is a figure for
demonstrating the speaker apparatus 100D which concerns on the 3rd example of this invention.
(A) is a top view of speaker device 100D, (B) is a sectional view along the line A-A of the speaker
device shown in (A). It is a figure for demonstrating the speaker apparatus 100E which concerns
on the 4th example of this invention. (A) is a top view of the speaker device 100D, and (B) is a
cross-sectional view along the line A-A of the speaker device 100E shown in (A). It is a figure for
demonstrating the speaker apparatus 100F which concerns on the 5th example of this invention.
(A) is a top view of the speaker device 100F, and (B) is a cross-sectional view taken along the line
A-A of the speaker device 100F shown in (A). It is a figure for demonstrating the speaker
apparatus 100G which concerns on the 6th example of this invention. (A) is a top view of the
speaker device 100G, and (B) is a cross-sectional view along the line A-A of the speaker device
100G shown in (A). It is a figure for demonstrating the speaker apparatus 100H which concerns
on the 7th example of this invention. (A) is a top view of the speaker device 100H, and (B) is a
cross-sectional view along the line A-A of the speaker device 100H shown in (A). It is a figure for
demonstrating the speaker apparatus 100K which concerns on 3rd Embodiment of this
invention. FIG. 14A is a top view of the speaker device 100K, and FIG. 14B is a cross-sectional
view of the speaker device 100K along line A-A shown in FIG. It is a figure for demonstrating the
operation | movement and effect of the speaker apparatus 100K which concerns on 3rd
Embodiment of this invention. FIG. 14A is a top view of the speaker device 100K shown in FIG.
14A, and FIG. 14B is an enlarged cross-sectional view along the line A-A near the diaphragm of
the speaker device 100K shown in FIG. is there. (A) is a top view of the speaker device 100J of
the comparative example, and (B) is a cross-sectional view taken along the line A-A near the
diaphragm of the speaker device 100j of the comparative example shown in (A). The frequency
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characteristic (solid line) of the sound pressure level of the reproduced sound of the speaker
device 100K according to the third embodiment of the present invention shown in FIG. 14 and
the sound pressure level of the reproduction benefit of the speaker device 100J as a comparison
object shown in FIG. FIG. 7 is a diagram showing the frequency characteristic (broken line) of
FIG.
It is a top view for demonstrating the diaphragm 8L of the speaker apparatus 100L which
concerns on the 8th example of this invention. It is a figure for demonstrating the speaker
apparatus 100M which concerns on 4th Embodiment of this invention. (A) is a top view of the
speaker apparatus 100M, (B) is a cross-sectional view taken along the line A-A of the speaker
apparatus 100M shown in (A).
Explanation of sign
[0140]
Reference Signs List 1 yoke 1a pole portion 1b base end portion 1c bottom yoke 2 magnet 3
plate 4 voice coil bobbin 5 voice coil 6 damper member 7 speaker frame (frame) 8 diaphragm 9
edge portion 81 rib 91 inner circumferential side joint portion 92 outer circumferential side joint
portion 93 Roll part 100 Speaker device 101 Magnetic circuit 102 Magnetic gap 800 Center axis
of speaker diaphragm (central axis of inner peripheral part of diaphragm, central axis of outer
peripheral part of diaphragm) 811, 812, 813 Rib
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