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JP2013219472

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DESCRIPTION JP2013219472
Abstract: [Problem] To provide a speaker capable of preventing generation of abnormal sound
and deterioration of sound quality caused by twisting of a frame due to unevenness or distortion
of a mounting portion of the speaker. SOLUTION: An edge 8 is provided on an edge 8 connected
to an outer peripheral edge of a diaphragm 2 of a speaker, and one end is between the mounting
surface 3h of the frame 3 to a mounting portion and an annular portion 3j to which the magnetic
circuit 1 is attached. A plurality of beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, separated from the
outer wall 3g of the frame, the other end being tangentially connected to the annulus, the back
part being X-shaped 9j is provided. By absorbing the deformation stress of the mounting surface
with the unevenness of the edge and dispersing and canceling it with the X-shaped beam, the
voice coil gap is affected and the dimensions of the voice coil and the magnetic circuit gap can
not hold the design value. It is possible to prevent the generation of sound and the deterioration
of sound quality. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices, and, for example, to a
frame structure suitable for use in vehicles and an edge structure of a diaphragm.
[0002]
Conventionally, this type of speaker is configured as shown in, for example, FIGS. 6 (a) to 6 (c)
and FIG.
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1
6 (a) is a rear view of the speaker, FIG. 6 (b) is a cross section and a side view, FIG. 6 (c) is a front
view, and FIG. 7 is an enlarged cross sectional view of the upper part of FIG. .
[0003]
In FIGS. 6 and 7, 1 is a magnetic circuit, 2 is a diaphragm (for example, cone paper), and 3 is a
frame. Mounting portions 3a, 3b and 3c for mounting on the mounting portion are formed on the
outer edge portion of the frame 3 so as to protrude outward, and screw holes 3d, 3d and 3c are
respectively formed on these mounting portions 3a, 3b and 3c. 3e and 3f are provided.
[0004]
The outer wall 3g of the frame 3 is formed with a flange 3i. An annular buffer member 4 made of
urethane, rubber or the like is fixed to the mounting surface 3h of the flange 3i. The mounting
surface 3h of the frame 3 is attached to the mounting portion via the buffer member 4 with the
screw holes 3d, 3e, and 3f as fixing points (3 places).
[0005]
Further, the frame 3 is provided with beams 3k, 3l, 3m, 3n, 3n, 3o, 3p which are directed linearly
from the outer wall 3g to the annular portion 3j arranged to surround the magnetic circuit 1. In
other words, the mounting surface 3h of the frame 3 and the annular portion 3j to which the
magnetic circuit 1 is attached are connected by linear beams 3k, 3l, 3m, 3n, 3o and 3p.
[0006]
Furthermore, a wide beam 3q is provided from the outer wall 3g toward the annular portion 3j,
and the ends of the wires 6a and 6b from the voice coil are connected to the terminals 5a and 5b
attached to the beam 3q, respectively. ing. The outer wall 3g of the frame 3 corresponding to the
terminals 5a and 5b protrudes in a tongue shape on the back side, and the tongue-like projection
3r protects the terminals 5a and 5b, for example, the mounting portion and the terminals 5a and
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2
5b. It prevents interference and prevents the terminals 5a and 5b from being hit when water
such as water drops intrudes.
[0007]
The edge 2a of the diaphragm 2 generally has a half roll shape as shown in FIG. 8, for example.
Although not shown, a voice coil is joined near the central part of the diaphragm 2, and the voice
coil is disposed in the magnetic field between the air gaps of the magnetic circuit 1 to flow a
current, whereby the diaphragm 2 is It is supposed to be driven.
[0008]
By the way, since the above speaker is attached to the mounting portion through the frame, the
frame accurately holds the vibration system such as the diaphragm and the voice coil and the
support system such as the edge and the damper with respect to the magnetic circuit. Is required.
[0009]
In addition, the aperture ratio needs to be high so that the back pressure applied to the rear
surface during vibration of the diaphragm does not adversely affect the frequency characteristics
etc. For example, Patent Document 1 discloses that the back of the diaphragm is not reduced in
strength as a frame. A technology is disclosed that increases the aperture ratio to reduce weight
and cost.
[0010]
Furthermore, for example, Patent Document 2 describes a technique for preventing generation of
resonance noise by transmitting vibration to the mounting portion when the frame vibrates due
to driving of the speaker.
[0011]
JP, 2002-142290, A JP, 2006-229522, A
[0012]
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3
However, when the speaker having the above-described structure is attached to the mounting
portion, if the mounting portion (speaker mounting surface) has irregularities or distortion,
distortion occurs on the mounting surface 3 h of the frame 3.
In particular, since the vehicle-mounted speaker is attached to a door panel, a rear tray, a
dashboard or the like, the mounting portion is often not flat.
[0013]
For this reason, if the mounting portion 13 is flat as shown in FIG. 9A, the mounting portion 3b
(same for the flange 3i) of the frame 3 is in close contact with the surface of the mounting
portion 13 and there is no distortion. On the other hand, when the mounting portion 13 has
unevenness or distortion, the mounting portion 3b of the frame 3 (same as the flange 3i) floats
from the surface of the mounting portion 13 as shown in FIG. 9B. The mounting portion 3b and
the flange 3i are deformed.
[0014]
The deformation stress of the flange 3i is applied to the edge 2a of the diaphragm 2, the roll of
the edge 2a of the one-sided half roll shape is deformed, and the stress that lifts and deforms the
diaphragm 2 by the repulsive force of the deformed roll work.
This stress acts as a force causing deformation of the voice coil through the diaphragm 2 as
indicated by the arrow.
[0015]
As described above, since the edge 2a has a constant convex shape, the deformation stress is
transmitted to the junction point of the voice coil located at the center via the edge 2a and the
diaphragm 2 as the flange 3i is deformed.
[0016]
As a result, the gap in which the voice coil is disposed is affected, and the design value of the gap
(gap) between the voice coil and the magnetic coil can not be maintained, which causes
generation of abnormal sound and deterioration of sound quality.
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[0017]
Further, since the outer wall 3g of the frame 3 and the beams 3k, 3l, 3m, 3n, 3o and 3p are
connected, the beams 3k, 3l, 3m, 3n and 3o provided linearly from the outer wall 3g to the
magnetic circuit 1 , 3p, the “torsion stress” generated by the twisting of the attachment
portions 3a, 3b, 3c is directly transmitted to the magnetic circuit 1, and the magnetic circuit 1 is
inclined.
[0018]
In FIGS. 6A and 6C, the manner in which the generated deformation stress is transmitted to the
magnetic circuit 1 is shown by the arrows, as the mounting portion 3b or the flange 3i in the
vicinity thereof is twisted.
As a result, the voice coil gap is affected, and the design values of the voice coil and magnetic
circuit gap dimensions (gaps) can not be held, which also causes generation of abnormal noise
and deterioration of sound quality.
[0019]
The present invention has been proposed in view of the above, and an object of the present
invention is to provide a speaker capable of preventing generation of abnormal sound and
deterioration of sound quality due to twisting of a frame due to unevenness or distortion of a
mounting portion of the speaker. It is to do.
[0020]
In order to solve the above problems, the speaker according to the present invention according
to claim 1 is provided continuously with a magnetic circuit 1, a vibration system having a
diaphragm 2 driven by the magnetic circuit, and an outer peripheral edge portion of the
diaphragm. A speaker including a support system having the edge 8 and a frame 3 for holding
the magnetic circuit, the vibration system and the support system and attaching the support
system to the mounting portion 13, wherein the edge 8 is provided with irregularities. One end
of the frame 3 is separated from the outer wall of the frame, and the other end is tangentially
coupled to the annular portion, between the attachment surface 3 h of the frame 3 to the
mounting portion and the annular portion 3 j to which the magnetic circuit 1 is attached. A
plurality of beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j whose backs are X-shaped are provided.
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[0021]
The invention according to claim 2 relates to the speaker according to claim 1, wherein the
unevenness of the edge 8 includes a pair of convex portions 11-1 and 11-2 and a concave
portion 12 sandwiched between the convex portions. It is characterized in that one set is formed,
a plurality of sets surround the diaphragm 2, and the asperities are arranged in a spiral.
[0022]
The invention according to claim 3 relates to the loudspeaker according to claim 1 or 2, wherein
the outer wall 3g of the frame 3 and the plurality of beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j. It
is characterized by including a groove-like separation region 10 interposed between one end and
the other.
[0023]
According to the speaker of the present invention, one end is separated from the outer wall of the
frame between the mounting surface of the frame and the annular portion to which the magnetic
circuit is attached, and the other end is tangential to the annular portion. By providing the beams
to be coupled, the stress of the flange deformation can be dispersed and absorbed by the
unevenness of the edge and the beams respectively to prevent the generation of abnormal noise
and the deterioration of the sound quality.
In addition, by forming the back of the frame in an X shape, deformation of one beam can be
suppressed by the other beam, and a high absorption effect of deformation stress can be
obtained.
[0024]
Further, by arranging the unevenness of the edge in a spiral form with respect to the center of
the diaphragm, the stress directed from the outer wall of the frame toward the magnetic circuit
can be dissipated in an oblique direction and absorbed easily.
[0025]
The speaker which concerns on the Example of this invention is shown, (a) A view is a rear view,
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(b) A view is a cross section and a side view, (c) A view is a front view.
It is an expanded sectional view of the upper part of FIG.1 (b).
It is a perspective view of the diaphragm in the speaker shown to FIG. 1 and FIG.
It is an expanded sectional view of the edge in the diaphragm shown in FIG.
It is for explaining absorption of the deformation stress of the attaching part of the frame and the
flange in the speaker shown in FIG. 1, (a) Figure shows a normal state, (b) a sectional view
showing the attaching state and the deformed state of the flange It is.
The conventional speaker is shown, (a) figure is a rear view, (b) figure is a cross section and a
side view, (c) figure is a front view.
It is an expanded sectional view of the upper part of FIG.6 (b).
It is an expanded sectional view of the edge of the diaphragm in the speaker shown in FIG.
FIG. 6 is for explaining the transmission of deformation stress from the flange of the frame to the
voice coil in the speaker shown in FIG. 6; FIG. 6A shows a normal state; FIG. FIG.
[0026]
Hereinafter, an embodiment of the present invention will be described based on the drawings.
[0027]
FIG. 1 shows a speaker according to an embodiment of the present invention, wherein (a) is a
rear view, (b) is a cross section and a side view, and (c) is a front view.
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FIG. 2 is an enlarged cross-sectional view of the upper portion of FIG. 1 (b).
In FIGS. 1 and 2, parts corresponding to those in FIGS. 6 and 7 are denoted by the same
reference numerals.
[0028]
That is, mounting portions 3a, 3b and 3c are provided on the outer edge portion of the frame 3
so as to protrude outward, and screw holes 3d, 3e and 3f and these screw portions are
respectively provided in these mounting portions 3a, 3b and 3c. A pair of recesses 7a, 7b, 7c, 7d,
7e, 7f are provided on the back side to prevent shrinkage of the resin and reduce weight so as to
sandwich the holes 3d, 3e, 3f, respectively.
[0029]
Further, a flange 3i is provided on the outer wall 3g of the frame 3, and an annular buffer
member 4 made of urethane, rubber or the like is fixed to a mounting surface 3h of the flange 3i.
The mounting surface 3h of the frame 3 is attached to the mounting portion via the buffer
member 4 with the screw holes 3d, 3e, and 3f as fixing points (3 places).
[0030]
Furthermore, between the mounting surface 3h of the frame 3 and the annular portion 3j for
attaching the magnetic circuit 1, one end is separated from the outer wall 3g of the frame 3 and
the other end is coupled tangentially to the annular portion 3j A plurality of beams 9a, 9b, 9c, 9d,
9e, 9f, 9g, 9h, 9i, 9j are provided such that the back portion has an X shape. These beams 9a, 9b,
9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j disperse the “torsion stress” generated by the twisting of the
mounting surface 3h of the frame 3, and this stress directly affects the magnetic circuit 1 Not to
act on
[0031]
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That is, when the mounting portion 3b or the flange 3i in the vicinity thereof is deformed and, for
example, a deformation stress as shown by the arrows is applied to the beams 9a and 9b in FIGS.
1 (a) and 1 (c), the deformation stress becomes two beams 9a. , 9b, and in the tangential
direction of the annular part 3j, the stresses are transmitted in such a way as to cancel the
deformation in the rotational direction. As a result, deformation of the annular portion 3j can be
suppressed, the air gap in which the voice coil is disposed can be prevented from being affected,
and the design values of the dimensions of the voice coil and the magnetic circuit air gap can be
maintained. As a result, it is possible to prevent the generation of abnormal noise and the
deterioration of sound quality.
[0032]
In addition, a groove-like separation area 10 along the inner wall of the frame 3 between the
mounting surface 3h of the frame 3 and the beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j,
respectively. Are formed, and one end of the beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j is
separated from the outer wall 3g of the frame 3, so that torsion stress generated in the flange 3i I
try not to let
[0033]
That is, while the outer wall 3g of the frame 3 and the beams 3k, 3l, 3m, 3n, 3o, 3p and 3q are
conventionally joined in a V shape, a groove-shaped separation region 10 having a U-shaped
cross section is provided. As a result, the transmission of stress is blocked by the two corner
portions on the inner surface of the separation region 10 so as not to affect the magnetic circuit
1 portion.
[0034]
Furthermore, a wide beam 3q is provided from the outer wall 3g toward the annular portion 3j,
and the ends of the wires 6a and 6b from the voice coil are connected to the terminals 5a and 5b
attached to the beam 3q, respectively. ing.
The outer wall 3g of the frame 3 corresponding to the terminals 5a and 5b protrudes in a tongue
shape on the back side, and the tongue-like projection 3r protects the terminals 5a and 5b, for
example, the mounting portion and the terminals 5a and 5b. It prevents interference and
prevents the terminals 5a and 5b from being hit when water such as water drops intrudes.
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9
[0035]
FIG. 3 is a perspective view of the diaphragm in the speaker shown in FIGS. 1 and 2. FIG. 4 is an
enlarged sectional view of an edge 8 of the diaphragm 2 shown in FIG.
As shown in FIG. 3 and FIG. 4, the edge 8 continuously connected to the outer peripheral edge
portion of the diaphragm 2 is formed uneven. In this example, the unevenness is such that a pair
of convex portions 11-1 and 11-2 and one concave portion 12 sandwiched by these convex
portions form one set and plural sets surround the diaphragm 2. And it is arranged in a spiral.
Due to the unevenness, a part of the stress of the flange deformation is absorbed at the edge 8.
[0036]
As shown in FIG. 5A, when the mounting portion 13 is flat, the mounting portion 3b (same for
the flange 3i) of the frame 3 is in close contact with the surface of the mounting portion 13 and
no distortion is normal. It becomes attached state. On the other hand, when there is unevenness
or distortion in the mounting portion 13, the mounting portion 3b (same for the flange 3i) of the
frame 3 floats from the surface of the mounting portion 13 as shown in FIG. 5B. The portion 3b
and the flange 3i are deformed. At this time, the unevenness of the edge 8 is convoluted
(collapsed) so as to absorb the stress, so that it is possible to prevent the stress from being
transmitted to the diaphragm 2 even in a mounting surface defect.
[0037]
As described above, according to the present invention, since the edge 8 absorbs the deformation
stress of the mounting portions 3a, 3b, 3c and the flange 3i by providing the unevenness on the
edge 8, the broken arrow in FIG. As shown, deformation stress can be prevented from being
transmitted to the junction with the voice coil via the diaphragm 2.
[0038]
In addition, X-shaped beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j are formed between the
mounting surface 3h of the frame 3 and the annular portion 3j to which the magnetic circuit 1 is
attached. The mounting portions 3a, 3b, 3c and the flange 3i are provided by providing and
separating the beams 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, 9j from the outer wall 3g of the frame 3 in
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the separation area 10. Can be prevented from being transmitted to the magnetic circuit 1.
[0039]
As a result, the design dimensions of the voice coil and the magnetic circuit gap can be
maintained, and the generation of abnormal noise and the deterioration of sound quality can be
prevented.
Therefore, according to the present invention, it is possible to prevent the generation of
abnormal sound and the deterioration of sound quality caused by the twisting of the frame due to
the speaker mounting surface defect.
[0040]
Although the case of using paper-based cone paper as the diaphragm 2 has been described as an
example, the present invention can be applied to various materials such as metal-based, polymerbased and ceramic-based vibration materials.
[0041]
Moreover, if the edge 8 can also form an unevenness | corrugation, the thing of various
materials, such as urethane, rubber, rubber | gum, foam rubber, an artificial leather, can be used.
[0042]
Furthermore, as a forming material of the said flame | frame 3, a well-known various material
can be used, For example, ABS resin, a polypropylene resin, polycarbonate resin etc. are
employable.
[0043]
DESCRIPTION OF SYMBOLS 1 magnetic circuit 2 diaphragm 2a edge 3 frame 3a, 3b, 3c
attachment part 3d, 3e, 3f screw hole 3g outer wall 3h attachment surface 3i flange 3j annular
part 3k, 3l, 3m, 3n, 3o, 3p, beam 3r tongue Projection part 4 Buffer member 5a, 5b Terminal 6a,
6b Wiring 7a, 7b, 7c, 7d, 7e Recess 8 Edge 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i Beam 10 Separation
Region 11-1, 11-2 Convex part 12 Concave part 13 Mounting part
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