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JP2007311966

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007311966
The present invention provides a diaphragm for an eccentric type speaker device capable of
improving sensitivity without mainly increasing the weight of a body. An eccentric type
diaphragm is constituted by a laminate (body) formed by laminating a plurality of substrates, has
an attachment hole for attachment to a voice coil bobbin, and is attached to the center of the
laminate. The center of the hole has an eccentric shape, and at least one of the plurality of
substrates, an opening is provided on the side where the distance from the center of the
mounting hole to the outer edge of the laminate is large, and the opening is a laminate It has not
penetrated the body. This makes it possible to reduce the weight of the portion of the laminate
corresponding to the overweight side with reference to the center of the mounting hole, and
correct the unbalance of the moment of inertia. Moreover, the weight of the diaphragm itself can
be reduced by this, and the sensitivity can be improved. Furthermore, since the opening does not
penetrate through the laminate, when the diaphragm vibrates, the sensitivity of the speaker
device does not decrease due to the opening. [Selected figure] Figure 2
Eccentric diaphragm device and speaker device
[0001]
The present invention relates to the structure of an eccentric type diaphragm for a speaker
device.
[0002]
Heretofore, there has been known an eccentric diaphragm having a shape in which the center of
a mounting hole used when being attached to a voice coil bobbin is eccentric with respect to the
center of a body.
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[0003]
In a speaker device having such an eccentric diaphragm, the eccentric diaphragm is mounted
through the mounting hole so that the central axis passing through the center of the mounting
hole is coaxial with the central axis of the voice coil bobbin. Is attached to
According to such a configuration, it is possible to disperse divided vibrations generated in the
eccentric diaphragm, obtain frequency characteristics with few peaks and dips, and suppress
deterioration of high-frequency directional characteristics.
[0004]
However, as described above, such an eccentric diaphragm has a shape in which the center of the
mounting hole used when mounted on the voice coil bobbin is eccentric to the center of the
body.
For this reason, in such an eccentric diaphragm, the weight on the side where the distance from
the center of the mounting hole to the outer edge of the body is larger from the center of the
mounting hole to the outer edge of the trunk is based on the center of the mounting hole. The
distance is greater than the smaller weight. For this reason, in such an eccentric diaphragm, the
balance between the moment of inertia of the body portion on the heavy side and the moment of
inertia of the body portion on the side of small weight is broken. As a result, when the eccentric
diaphragm vibrates, rolling occurs, and the vibration system member such as the voice coil
bobbin or the voice coil wound around the voice coil bobbin and the magnetic circuit easily come
into contact with each other mechanically. There is a problem that an abnormal sound is
produced by a hit.
[0005]
For example, Patent Documents 1 and 2 disclose eccentric diaphragms (e.g., eccentric cones for
speakers) that can solve this type of problem.
[0006]
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In the eccentric cone for a speaker described in Patent Documents 1 and 2, a metal balancer is
attached to the outer peripheral portion of the cone surface on the side where the moment of
inertia is smaller than the eccentric hole.
As a result, the unbalance of the moment of inertia of the entire speaker eccentric cone is
corrected, and the above-mentioned problems can be improved.
[0007]
It is to be noted that an eccentric speaker device capable of correcting the unbalance of the
moment of inertia by making the magnetic flux density between the magnetic flux density at a
portion close to the central portion of the diaphragm and the magnetic flux density at a distant
portion nonuniform has been proposed (for example, , Patent Document 3).
[0008]
Moreover, although it is not an eccentric diaphragm, an example of a diaphragm for a speaker
device, a speaker device and an edge for a speaker device which can solve the above problems is
proposed in Patent Documents 4 to 6, respectively. .
[0009]
In the diaphragm for a speaker device described in Patent Document 4, a weight balance portion
thicker than the other portion is integrally formed on the opposite side of the diaphragm to the
side supporting the voice coil feeder.
This is said to suppress rolling.
[0010]
Further, in the speaker device described in Patent Document 5, the cone surface radius on the
left and right is equal to the center line of the cone-shaped diaphragm, and the curvature of the
cone curve is asymmetrical. It will be installed as a point side.
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With this configuration, the effective area of the vibrating surface facing the listening point is
increased, direct sound is increased, and the directivity characteristic to the listening point is
expanded. As a result, it is supposed that the sound quality can be improved.
[0011]
Further, the edge for a speaker device described in Patent Document 6 is coupled to the outer
periphery of an elliptical or non-circular diaphragm, and the width on the minor axis direction
side is narrower than the width on the major axis direction side of the diaphragm. The length
dimension at the time of unfolding at any position is equal over the entire circumference.
According to such a configuration, it is supposed that the stepness can be equivalent equally over
the entire circumference of the speaker device edge, the balance of the support system can be
corrected, and excellent performance with less distortion can be obtained.
[0012]
Patent Document 1: Japanese Patent Application Publication No. 11-155189 Patent Document 3:
Japanese Patent No. 3405160 Patent Document 2: Japanese Patent Application Publication No.
2002-374595 Patent Document 2: Japanese Patent Application Publication No. 2005-6140
Patent Document: Patent No. 2952920 Patent Document 3: Patent No. 3132253
[0013]
In the eccentric cone for a speaker described in Patent Documents 1 and 2 described above, by
providing a metal balancer, unbalance in moment of inertia is corrected, and abnormal noise due
to mechanical collision between the vibration system member and the magnetic circuit. It has the
advantage of preventing the occurrence.
[0014]
However, since such a speaker eccentric cone is provided with a metal balancer, the weight of the
speaker eccentric cone is increased by that amount, and the sensitivity of the speaker device
(particularly the sensitivity in the high region) is reduced. As a result, there is a problem that the
product cost of the eccentric cone for the speaker becomes high.
[0015]
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As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example.
The present invention improves the sensitivity of a speaker device without increasing the weight
of the eccentric type speaker device diaphragm, and can reduce the product cost of the speaker
device diaphragm and speaker device. The challenge is to provide
[0016]
The invention according to claim 1 is a diaphragm for a speaker device for an eccentric type,
which is constituted by a laminate formed by laminating a plurality of base materials, and has a
mounting hole for attaching to a voice coil bobbin, and the laminate The center of the mounting
hole has an eccentric shape with respect to the center of the body, and the distance from the
center of the mounting hole to the outer edge of the laminate is large in at least one of the
plurality of substrates. The side is provided with an opening, and the opening does not penetrate
through the layered product.
[0017]
In one embodiment of the present invention, the diaphragm for a speaker device for an eccentric
type is formed of a laminate formed by laminating a plurality of substrates, and has a mounting
hole for attaching to a voice coil bobbin, and The mounting hole has a shape in which the center
of the mounting hole is eccentric with respect to the center, and on at least one of the plurality of
substrates, the distance from the center of the mounting hole to the outer edge of the laminate is
large. Are provided with an opening, which does not penetrate the laminate.
[0018]
The above-mentioned diaphragm for the speaker device for an eccentric type is constituted by a
laminate formed by laminating a plurality of base materials, and has an attachment hole for
attaching to a voice coil bobbin, and the attachment hole with respect to the center of the
laminate. The center of the has an eccentric shape.
As described above, since such an eccentric type diaphragm for a speaker device is configured by
a laminate formed by laminating a plurality of base materials, compared with an eccentric type
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diaphragm composed of one base material, It is possible to improve the strength of the eccentric
type diaphragm for a speaker device.
In a suitable example, as a forming material of each base material, for example, a paper-based
material such as paper making, a polymer-based material such as polypropylene, a fiber-based
material such as cloth material, or a composite material including these materials is preferable.
[0019]
Further, in the diaphragm for the speaker device for such an eccentric type, an opening is
provided on the side where the distance from the center of the mounting hole to the outer edge
of the laminate is large in at least one of the plurality of substrates constituting the laminate. It is
provided.
Thereby, the weight of the portion of the laminate corresponding to the side of excess weight of
the laminate, that is, the side where the distance from the center of the attachment hole to the
outer edge of the laminate is large is lightened based on the center of the attachment hole. can
do.
Therefore, the moment of inertia of the portion of the laminate corresponding to the side where
the distance from the center of the mounting hole to the outer edge of the laminate is large and
the distance from the center of the mounting hole to the side where the distance from the outer
edge of the laminate is smaller Unbalance with the moment of inertia of the part can be improved
(corrected). Therefore, in the speaker device using the eccentric type speaker device diaphragm,
rolling (rolling) hardly occurs at the time of the vibration, and mechanical contact between the
vibration system member and the magnetic circuit does not occur. As a result, no abnormal noise
is generated due to mechanical contact between the vibration system member and the magnetic
circuit.
[0020]
Further, in the diaphragm for the speaker device for the eccentric type, the laminated body is
provided with the opening, so the weight of the diaphragm for the speaker device for the
eccentric type is also lightened accordingly, and the sensitivity of the speaker device ( In
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particular, the sensitivity of the high region can be improved. Moreover, with such a
configuration, it is not necessary to provide a balancer as in the diaphragms of the abovementioned Patent Documents 1 and 2, etc., so the product cost of the diaphragm for an eccentric
type speaker device can be reduced accordingly. It also becomes possible to lower the product
cost of the speaker device.
[0021]
Further, in order to facilitate improvement of the unbalance of the moment of inertia of the
eccentric type diaphragm for a speaker device, the laminate has a cone shape, and the opening is
provided on the outer peripheral portion of the at least one base material. It is preferred that In a
preferred example, it is preferable that a plurality of the openings be provided along the outer
periphery of the at least one base material and at appropriate intervals.
[0022]
In addition, the size (area) of the opening is preferably set to a size that corrects the unbalance of
the moment of inertia of the laminate caused due to the shape of the laminate which is eccentric.
That is, the size (area) of the opening is the size of the moment of inertia of the portion of the
laminate having the largest distance from the center to the outer edge of the laminate with
respect to the center of the mounting hole; It is preferable that the size of the moment of inertia
of the portion of the laminated body on the side where the distance from the center to the outer
edge of the laminated body is the smallest be substantially the same (including the same).
[0023]
In addition, the plurality of base materials constituting the laminate are formed of materials
having different specific gravities, and the openings serving to correct the unbalance of the
moment of inertia of the diaphragm for an eccentric type speaker device are the plurality of
openings. It is preferable to be provided in the base material with the largest specific gravity
among the base materials. Thus, the size (area) of the opening formed in the laminate can be
reduced.
[0024]
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Further, in the case of a comparative example in which an eccentric diaphragm is formed not by
a plurality of substrates but by one substrate and an opening having the above-mentioned
function passes through the diaphragm, in this comparative example, At the time of vibration, air
leaks from the through-hole opening, and the sound wave radiated to the sound emission side
and the sound wave radiated to the sound emission side and the opposite side mutually interfere
with each other to reduce the sensitivity of the speaker device Problems can occur.
[0025]
In this respect, the diaphragm for a speaker device for an eccentric type is constituted by a
laminate formed by laminating a plurality of substrates, and an opening is provided in at least
one of the plurality of substrates, and the opening is a laminate Has a structure that does not
penetrate the body.
Therefore, when the diaphragm of the eccentric type speaker device vibrates, the problem as
described above does not occur, and the sensitivity of the speaker device does not decrease due
to the opening.
[0026]
In another embodiment of the present invention, the above-mentioned diaphragm for the speaker
device for the eccentric type and the voice coil bobbin, the diaphragm for the speaker device for
the eccentric type has an axis passing through the center of the mounting hole and the voice The
voice coil bobbin is attached to the voice coil bobbin through the attachment hole so as to be
coaxial with the central axis of the coil bobbin. Thus, a speaker device having an eccentric type
speaker device diaphragm can be configured.
[0027]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
[0028]
[Configuration of Speaker Device] FIG. 1 shows a cross-sectional view of the speaker device 100
including the eccentric-type diaphragm 8 according to the embodiment of the present invention
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cut along a plane passing through the central axis L1.
[0029]
As shown in FIG. 1, the speaker device 100 includes a magnetic circuit 30 including a yoke 1, a
magnet 2 and a plate 3, a frame 4, a voice coil bobbin 5, a voice coil 6, a damper 7, an eccentric
diaphragm 8 and an edge 9. And the vibration system member 31 including the cap 11.
In the present invention, the structure and driving method of the speaker device are not limited.
[0030]
First, the configuration of the magnetic circuit 30 will be described.
[0031]
The magnetic circuit 30 is configured as an external magnet type magnetic circuit.
[0032]
The yoke 1 has a pole portion 1a having a substantially cylindrical shape, and a flange portion 1b
formed to extend outward from the lower end portion of the outer peripheral wall of the pole
portion 1a.
[0033]
The magnet 2 has a substantially annular shape and is mounted on the flange portion 1 b.
A plate 3 having a substantially annular shape is mounted on the magnet 2.
A magnetic gap 32 is formed in the gap between the inner peripheral wall of the plate 3 and the
outer peripheral wall of the pole portion 1a.
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[0034]
Next, the configuration of the vibration system member 31 will be described.
[0035]
The frame 4 has a function of supporting various speaker device components.
The frame 4 has a substantially bowl-like shape and a step-like cross-sectional shape, and
includes a first step 4a, a second step 4b provided on the upper side of the first step 4a and an
outer side, and the second step And a third step 4c provided on the upper side and the outer side
of the step 4b.
The first step 4 a which is an element of the frame 4 is mounted on the plate 3.
Thus, the frame 4 is coupled to the magnetic circuit 30.
[0036]
The voice coil bobbin 5 has a substantially cylindrical shape. The vicinity of the lower end
portion of the voice coil bobbin 5 covers the vicinity of the upper end portion of the pole portion
1 a of the yoke 1. Therefore, the lower end portion of the inner peripheral wall of the voice coil
bobbin 5 is opposed to the upper end portion of the outer peripheral wall of the pole portion 1a
while the lower end portion of the outer peripheral wall of the voice coil bobbin 5 is the inner
peripheral wall of the plate 3 and They are respectively opposed to a part of the inner peripheral
wall of the magnet 2.
[0037]
The voice coil 6 is wound around the lower end portion of the outer peripheral wall of the voice
coil bobbin 5, and the outer peripheral wall of the voice coil 6 faces the inner peripheral wall of
the plate 3. The voice coil 6 consists of one wire and has positive and negative lead wires not
shown. The lead wire on the positive side is an input wiring of the L (or R) channel signal, and the
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lead wire on the negative side is an input wiring of the ground (GND: ground) signal. The positive
and negative lead wires are electrically connected to terminals (not shown) provided at
appropriate positions of the frame 4 respectively, while the terminals are also electrically
connected to output wires on the amplifier side (not shown). ing. As a result, signals and power
for one channel are input to the voice coil 6 from the amplifier side through the terminals and
the plus and minus lead wires.
[0038]
The damper 7 has a substantially annular shape and is configured to include a plurality of
concentric wave-shaped elastic portions that elastically support the voice coil bobbin 5 and the
like. The inner peripheral edge of the damper 7 is attached near the upper end of the outer
peripheral wall of the voice coil bobbin 5, while the outer peripheral edge of the damper 7 is
attached on the second step 4 b of the frame 4.
[0039]
The eccentric diaphragm 8 has a function of emitting a sound wave according to the input signal.
The eccentric diaphragm 8 has a cone-like shape, and is provided with a mounting hole 8 c used
when attaching itself to the voice coil bobbin 5. The inner peripheral edge 8 b of the eccentric
diaphragm 8 is attached to the upper end of the outer peripheral wall of the voice coil bobbin 5.
Thus, the central axis L1 of the speaker device 100, which is also the central axis of the voice coil
bobbin 5, and the axis L2 passing through the center of the mounting hole 8c of the eccentric
diaphragm 8 are coaxially located. On the other hand, an edge 9 having a substantially Q-shaped
cross-sectional shape is attached to the outer peripheral portion 8 d of the eccentric-type
diaphragm 8. The outer peripheral edge of the edge 9 is mounted on the third step 4 c of the
frame 4. The detailed configuration of the eccentric diaphragm 8 will be described later.
[0040]
The cap 11 has a dome-like shape, and the vicinity of the outer peripheral end thereof is attached
on the sound emitting surface of the inner peripheral portion of the eccentric-type diaphragm 8
on the sound emitting side. Therefore, the cap 11 plays a role of preventing moisture and foreign
matter from intruding into the magnetic circuit 30 from the sound output side.
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[0041]
In the speaker device 100 having the above configuration, the signal and the power output from
the amplifier side are supplied to the voice coil 6 through the terminals and the positive and
negative lead wires of the voice coil 6. As a result, driving force is generated in the voice coil 6 in
the magnetic gap 32, and the eccentric diaphragm 8 is vibrated in the direction of the central
axis L1 of the speaker device 100. Thus, the speaker device 100 emits a sound wave in the
direction of the arrow Y1.
[0042]
[Configuration of Eccentric-Type Vibration Plate] Next, the configuration of the eccentric-type
diaphragm 8 according to the embodiment of the present invention will be described with
reference to FIGS. 2 to 4.
[0043]
FIG. 2 is a perspective view of the eccentric diaphragm 8 as viewed from the rear side opposite to
the sound emission surface of the eccentric diaphragm 8 in the sound emission direction Y1 of
FIG.
FIG. 3 is a plan view of the eccentric diaphragm 8 as viewed from the back side opposite to the
sound emission surface of the eccentric diaphragm 8 in the sound emission direction Y1 of FIG.
In FIG. 1 to FIG. 3, the straight line L2 is an axis passing through the center O1 of the mounting
hole 8c, and the straight line L3 is the center O2 of the laminate constituting the eccentric
diaphragm 8 and the mounting hole 8c. It is a straight line passing through the center O1, and
the straight line L4 is a central axis of the stack 8a which passes through the center O2 of the
stack and is parallel to the straight line L2. FIG. 4 (a) is a cross-sectional view of the main part
showing the laminated structure of the eccentric type diaphragm 8 along the cutting line AA 'of
FIG. 2 and FIG. 3. In particular, the eccentric type diaphragm 8 is configured. It is principal part
sectional drawing when it cuts in the position which passes along the opening provided in the at
least one base material among a plurality of bases which are elements of a layered product.
[0044]
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The basic configuration of the eccentric type diaphragm 8 is as described above, and the
eccentric type diaphragm 8 has a cone shape, and as shown in FIG. The first base 80 disposed
opposite to the sound side, the third base 82 disposed on the sound emission side, and the first
base 80 disposed between the first base 80 and the third base 82 It is comprised by the
laminated body 8a which has a laminated structure (3 layer structure) with the 2nd 2nd base
material 81. FIG. In a preferable example, as a forming material of the first base 80, the second
base 81 and the third base 82, for example, a paper-based material such as paper making, a
polymer-based material such as polypropylene, a cloth material, etc. Preferred are fiber-based
materials of the above, or composite materials containing these materials.
[0045]
Further, the eccentric diaphragm 8 has a shape in which the center O1 of the mounting hole 8c
does not coincide with the center O2 of the laminate 8a constituting itself when viewed in a plan
view, that is, an eccentric shape. That is, in such an eccentric diaphragm 8, the distance between
the center O1 of the mounting hole 8c and the center O2 of the laminate 8a is set to d1 (> 0), and
the center O1 of the mounting hole 8c (or An axis L2 passing through the center O1 of the
mounting hole 8c is set at a position deviated from the center O2 of the laminate 8a (or a central
axis L4 passing through the center O2 of the laminate 8a), that is, an eccentric position.
[0046]
Thus, in the eccentric diaphragm 8, the outer edge (outer peripheral edge portion) of the
laminate 8a in the direction from the center O1 of the mounting hole 8c to the center O2 of the
laminate 8a (broken arrow Y2 direction) on the straight line L3. The distance to the end is d2,
and the distance from the center O1 of the mounting hole 8c to the outer edge (outer peripheral
edge) of the laminate 8a in the direction opposite to the direction from the center O2 of the
laminate 8a to the center O2 (solid arrow Y3) Is d3 (<d2).
[0047]
Further, a plurality of base materials constituting the laminate 8 a of the eccentric type
diaphragm 8, that is, the first base of the first base 80, the second base 81 and the third base 82.
The material 80 is provided with a plurality of openings 80a having a circular planar shape on
the side where the distance from the center O1 of the mounting hole 8c to the outer edge of the
laminated body 8a is large (in the direction of the broken arrow Y2).
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In the present example, a plurality of openings 80a are provided along the outer peripheral
portion of the first base material 80 constituting the laminate 8a and at appropriate intervals. For
this reason, the opening 80a does not penetrate through the laminate 8a constituting the
eccentric type diaphragm 8.
[0048]
The eccentric type diaphragm 8 having the above configuration is mounted such that the axis L2
passing through the center O1 of the mounting hole 8c is located coaxially with the central axis
L1 of the voice coil bobbin 5 as shown in FIG. It is attached near the upper end of the outer
peripheral wall of the voice coil bobbin 5 through the hole 8c.
[0049]
Next, the unique function and effect of the eccentric type diaphragm 8 according to the abovedescribed embodiment will be described.
[0050]
Generally, the eccentric diaphragm has a shape in which the center of the mounting hole used
when mounting itself on the voice coil bobbin is eccentric to the center of the body constituting
itself, so the outer edge from the center of the mounting hole The effective area of the torso
portion on the side with a large distance is larger than the effective area of the torso portion on
the side with a small distance from the center of the mounting hole to the outer edge.
Therefore, in such a diaphragm, the weight of the body portion on the side where the distance
from the center of the mounting hole to the outer edge is larger is larger than the weight of the
body portion on the side where the distance from the center of the mounting hole to the outer
edge is smaller.
Thus, in such a diaphragm, the moment of inertia of the body portion on the side where the
distance from the center of the mounting hole to the outer edge is larger is larger than the
moment of inertia of the body portion on the side where the distance from the center of the
mounting hole to the outer edge is smaller . As a result, in such an eccentric diaphragm, due to its
shape, the moment of inertia of the body portion on the side where the distance from the center
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of the mounting hole to the outer edge is large and the distance from the center to the outer edge
of the mounting hole are small. The balance with the moment of inertia of the torso portion on
the side will be lost.
[0051]
Therefore, when the eccentric diaphragm vibrates, rolling (rolling) occurs due to the unbalance of
the inertia moment of the eccentric diaphragm itself, and the voice coil wound around the voice
coil bobbin or the voice coil bobbin, etc. There is a problem that the mechanical contact between
the vibration system member and the magnetic circuit occurs, and an abnormal sound is
generated accordingly.
[0052]
Therefore, in order to improve such a problem, for example, in Patent Documents 1 and 2
described above, a balancer made of metal is attached to a portion of the diaphragm on the side
where the distance from the center to the outer edge of the mounting hole of the diaphragm is
small. The balance between the moment of inertia of the portion of the diaphragm where the
distance from the center of the mounting hole to the outer edge is large and the moment of
inertia of the portion of the diaphragm where the distance from the center of the mounting hole
to the outer edge is small I am trying to improve.
As a result, the unbalance of the moment of inertia is corrected, rolling is suppressed, and the
above-described abnormal noise is less likely to occur.
[0053]
However, when the balancer is provided on the eccentric diaphragm in this way, the weight of
the eccentric diaphragm is increased by that amount, and the sensitivity of the speaker device
(particularly, the sensitivity in the high region) is lowered. There is a problem that the product
cost of the eccentric type diaphragm becomes high.
[0054]
Therefore, in the present embodiment, such problems are eliminated, and the unbalance of the
moment of inertia generated due to the shape of the eccentric diaphragm is corrected to
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suppress the rolling and prevent the generation of the abnormal sound. An opening is provided
on the overweight side of the laminate 8a constituting the eccentric diaphragm 8, and the weight
on the overweight side of the laminate 8a is reduced.
The concept of the method for improving the unbalance of the moment of inertia in the present
invention is substantially the same as in the above-mentioned Patent Documents 1 and 2, so refer
to those patent documents.
[0055]
Specifically, first, the eccentric type diaphragm 8 of the present embodiment is formed by
laminating a plurality of base materials (that is, the first base 80, the second base 81, and the
third base 82). And has an attachment hole 8c for attaching itself to the voice coil bobbin 5, and
has a shape in which the center O1 of the attachment hole 8c is eccentric to the center O2 of the
laminate 8a, A so-called eccentric diaphragm is configured. As described above, since the
diaphragm 8 of the eccentric type according to the present embodiment has a laminated
structure including a plurality of substrates, the vibration of the eccentric type is compared with
the diaphragm of the eccentric type formed of one substrate. The strength of the plate 8 can be
improved.
[0056]
And in at least one base material (in this example, the first base material 80) among the plurality
of base materials, the distance from the center O1 of the mounting hole 8c to the outer edge
(outer peripheral edge) of the laminate 8a is An opening 80a is provided on the large side.
Thereby, based on the center O1 of the attachment hole 8c, the weight of the portion of the
laminate 8a corresponding to the overweight side of the laminate 8a, that is, the broken arrow
Y2 can be reduced. Therefore, it is possible to improve (correct) the unbalance between the
moment of inertia of the portion of the stacked body 8a corresponding to the broken arrow Y2
direction and the moment of inertia of the portion of the stacked body 8a corresponding to the
solid arrow Y3. Therefore, in the speaker device 100 using such an eccentric diaphragm 8,
rolling (rolling) is less likely to occur during its vibration, and mechanical contact between the
vibration system member 31 and the magnetic circuit 30 does not occur. Therefore, the
abnormal sound generated by the mechanical contact between the vibration system member 31
and the magnetic circuit 30 is not generated.
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[0057]
Further, since the opening 80a is provided in the laminated body 8a, the weight of the eccentric
diaphragm 8 is also lightened by that amount, and the sensitivity of the speaker device 100
(particularly, the sensitivity of the high region) is improved accordingly. be able to. Moreover, if
such a configuration is adopted, it is not necessary to provide a balancer as in the abovementioned eccentric type diaphragm, so the product cost of the eccentric type diaphragm 8 can
be reduced by that amount, and thus the speaker The product cost of the device 100 can be
reduced.
[0058]
Further, in the present embodiment, in order to facilitate improvement of the unbalance of the
moment of inertia of the eccentric type diaphragm 8, the opening 80a is a first member of the
laminated body 8a based on a general equation of the moment of inertia. It is preferable to be
provided on the outer peripheral portion of the base material 80 (e.g., in the vicinity of the
portion where the edge 9 and the laminate 8a are attached). In a preferred example, it is
preferable that a plurality of the openings 80a be provided along the outer periphery of the first
base material 80 constituting the laminate 8a and at an appropriate distance.
[0059]
Further, the size (area) of each opening 80a is preferably set to a size that corrects the unbalance
of the moment of inertia of the laminate 8a generated due to the shape of the laminate 8a being
eccentric. That is, the size (area) of each opening 80a is the laminate having the largest distance
from the center O1 of the mounting hole 8c to the outer edge (outer peripheral edge) of the
laminate 8a based on the center O1. The magnitude of the moment of inertia of the portion 8a
and the magnitude of the moment of inertia of the portion of the laminate 8a having the smallest
distance from the center O1 to the outer edge (outer peripheral edge) of the laminate 8a are
substantially the same (including the same It is preferable that the size is set to be
[0060]
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Further, the plurality of base materials (in this example, the first base material 80, the second
base material 81, and the third base material 82) constituting the laminate 8a are formed of
materials having different specific gravities, respectively, The opening serving to correct the
unbalance of the moment of inertia of the diaphragm 8 of the mold is preferably provided on the
substrate having the largest specific gravity among the plurality of substrates. Thus, the size
(area) of the opening formed in the laminate 8a can be reduced.
[0061]
Further, in the case of a comparative example in which an eccentric diaphragm is formed not by
a plurality of substrates but by one substrate and an opening having the above-mentioned
function passes through the diaphragm, in this comparative example, At the time of vibration, air
leaks from the through-hole opening, and the sound wave radiated to the sound emission side
and the sound wave radiated to the sound emission side and the opposite side mutually interfere
with each other to reduce the sensitivity of the speaker device Problems can occur.
[0062]
In this respect, the eccentric type diaphragm 8 of the present embodiment is a laminate 8a
formed by laminating a plurality of substrates, that is, the first substrate 80, the second substrate
81, and the third substrate 82. The opening 80a is provided only in the first base material 80
among the plurality of base materials, and the opening 80a does not penetrate through the
laminate 8a.
Therefore, when the eccentric diaphragm 8 vibrates, the problem as in the comparative example
does not occur, and the sensitivity of the speaker device 100 is not reduced due to the opening
80a. In the present invention, in place of such a configuration, in order to improve such a
problem, the eccentric diaphragm is constituted by a laminate formed by laminating a plurality of
substrates, and An opening may be provided in at least one of the base materials, and the
opening may have a structure not penetrating the laminate.
[0063]
[Modifications] In the above-described embodiment, in the eccentric diaphragm 8, a plurality of
substrates (in the present embodiment, the first substrate 80, the second substrate 81, and the
third substrate) constituting the laminate 8a are provided. The opening 80a is provided in the
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first base material 80 among the base materials 82). Not limited to this, in the present invention,
as shown in FIG. 4 (b), an opening 81a is provided in the second base 81 among the plurality of
bases, or as shown in FIG. The opening 82 a may be provided in the third base material 82
among the plurality of base materials. 4 (b) and 4 (c) are cross-sectional views of the main part of
the eccentric-type diaphragm 8 corresponding to FIG. 4 (a). Further, in the present invention,
from the viewpoint of preventing a decrease in sensitivity of the speaker device 100 as described
above, such an opening does not have to penetrate through the laminate 8a, and such an opening
constitutes the laminate 8a. It may be provided on at least one of the plurality of substrates.
[0064]
In the above embodiment, the opening having the role of correcting the unbalance of the
moment of inertia of the eccentric diaphragm 8 is formed to have a circular planar shape, but in
the present invention, the opening has the shape of the opening. There is no limitation. For
example, in the present invention, as shown in FIG. 5, among a plurality of substrates constituting
the laminate 8a, a substrate serving as a sound emitting surface, that is, a third substrate in the
present example, in order to enhance the design. The material 82 may be provided with an
opening 82x having a design such as a logo made of characters, figures, patterns, and the like
and combinations thereof. Further, in this case, as shown in FIG. 5, the opening 82x having the
design property has a symmetrical shape with respect to a straight line L3 passing through the
center O2 of the laminate 8a and the center O1 of the attachment hole 8c. Preferably it is
formed. Thereby, the unbalance of the moment of inertia generated due to the shape of the
eccentric type diaphragm 8x can be improved.
[0065]
In the above embodiment, the laminate 8a constituting the eccentric diaphragm 8 has a threelayer structure including the first base 80, the second base 81, and the third base 82. However,
the present invention is not limited to this, and in the present invention, the laminate constituting
the eccentric diaphragm 8 may be configured to have at least a two-layer structure.
[0066]
FIG. 1 shows a cross-sectional view of a loudspeaker device having an eccentric diaphragm
according to an embodiment of the present invention.
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The perspective view when observing from the sound emission surface and the opposite side of
the sound emission surface of the eccentric type diaphragm which concerns on a present
Example is shown. The top view when observing from the sound emission surface and the
opposite side of the sound emission surface of the eccentric type diaphragm which concerns on a
present Example is shown. The various principal part sectional drawing cut in the position which
passes along the opening of the diaphragm of the eccentric type | mold which concerns on a
present Example is shown. The top view when observing from the sound emission surface of the
diaphragm concerning a modification is shown.
Explanation of sign
[0067]
8 Eccentric diaphragm 8a Laminate 8b Inner peripheral portion 8c Mounting hole 8d Outer
peripheral portion 80 First base 81 Second base 82 Third base 80a, 81a, 82a Opening 100
Speaker device
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