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JP2008113275

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DESCRIPTION JP2008113275
PROBLEM TO BE SOLVED: To provide a speaker having high adhesive strength between a
speaker diaphragm and a voice coil, capable of reducing transmission loss, improving S / N ratio,
reducing peak dip on sound pressure frequency characteristic and having excellent reproduction
sound quality Provide a diaphragm and a speaker. A speaker diaphragm includes a first
diaphragm portion, a second diaphragm portion integrally formed with the first diaphragm
portion, and a back surface of a connecting portion between the first diaphragm portion and the
second diaphragm portion. The first diaphragm portion and the second diaphragm portion are
provided with a mounting portion provided projecting to the side and to which one end of the
voice coil bobbin is attached, and a rib portion provided projecting to the back side of the first
diaphragm portion A base material is impregnated with a thermosetting resin and molded, a
mounting part is molded by curing the thermosetting resin, and a rib part includes the base
material in their projecting parts and the thermosetting resin is hardened Being molded.
[Selected figure] Figure 1
Speaker diaphragm and speaker using the same
[0001]
The present invention relates to a speaker diaphragm having high bonding strength to a voice
coil bobbin and a speaker using the same, and more particularly, a speaker diaphragm having a
substantially elliptical outer shape having major and minor axes, a track shape or a rectangle,
The present invention relates to a speaker provided with a speaker diaphragm.
[0002]
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1
In the speaker, the bonding strength between the voice coil bobbin and the speaker diaphragm
affects the characteristics of the sound to be reproduced.
Conventionally, there is a speaker diaphragm which improves the adhesive strength between a
voice coil bobbin and a speaker diaphragm by the applicant of the present invention (Patent
Document 1). As shown in FIG. 2 of Patent Document 1, the speaker diaphragm 1 includes a first
diaphragm portion 5, a second diaphragm portion 6 integrally formed with the first diaphragm
portion 5, and a first diaphragm portion. And a mounting portion 7 provided on the back side of
the joint portion between the second diaphragm portion 6 and the second diaphragm portion 6
and to which one end of the voice coil bobbin is attached. The first diaphragm portion 5 and the
second diaphragm portion 6 The material is impregnated with the thermosetting resin, and the
mounting portion 7 is formed by curing the thermosetting resin. This speaker diaphragm can
reduce the transmission loss of the driving force from the voice coil bobbin, and the speaker
using this can improve the S / N ratio.
[0003]
In a speaker used for a display apparatus etc. which reproduces an image and sound, in order to
secure a screen part which mainly projects an image large, there may be restrictions in the
external shape of the diaphragm of a speaker, and its structure. Specifically, since a wide baffle
portion for mounting a speaker can not be secured around the screen portion of a display device,
a speaker diaphragm having a substantially elliptical outer shape having a major axis and a
minor axis (hereinafter referred to as An elongated speaker is often used when viewed from the
front using an elongated diaphragm. Compared with the speaker of the circular cone type
diaphragm which is often used, in the speaker of the elongated diaphragm, resonance is apt to
occur due to the insufficient strength of the elongated diaphragm (in particular, the lack of
strength in the longitudinal direction) As a result, there is a problem that peak dip appears in the
sound pressure frequency characteristic to cause deterioration of reproduction sound quality.
[0004]
In order to improve the characteristics by giving strength to the diaphragm portion of the
speaker diaphragm, there are some which are provided with ribs on the diaphragm.
Conventionally, there is a speaker diaphragm in which a plurality of reinforcing ribs in a radial
direction are integrally formed at the time of injection molding in a diaphragm main body by
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2
injection molding of a synthetic resin (Patent Document 2). Further, in the related art, there is
one in which a track type diaphragm is continuously curved in a convex-concave shape in a
direction in which sound radiates so as to suppress abnormal vibration in the longitudinal
direction (Patent Document 3).
[0005]
Patent No. 3846497 (FIGS. 1 to 4) Japanese Utility Model Application Publication No. 3-46296
(Fig. 1) Japanese Patent Laid-Open No. 2002-325294 (Fig. 1)
[0006]
However, even in the case of the speaker diaphragm of Patent Document 1 in which the bonding
strength is enhanced, resonance occurs due to the insufficient strength (in particular, the
strength in the longitudinal direction in the elongated direction) when the diaphragm shape is an
elongated diaphragm. As a result, there is a problem that peak dip appears in the sound pressure
frequency characteristic, which may cause deterioration of reproduction sound quality.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to increase the bonding strength between the speaker diaphragm and the voice
coil, to reduce the transmission loss, and to reduce the S / N ratio. It is an object of the present
invention to provide a speaker diaphragm and a speaker capable of improving the ratio, reducing
peak dips on sound pressure frequency characteristics, and excellent in reproduction sound
quality.
[0008]
The speaker diaphragm according to the present invention includes the first diaphragm portion,
the second diaphragm portion integrally formed with the first diaphragm portion, and the back
side of the joint portion between the first diaphragm portion and the second diaphragm portion.
The first diaphragm portion and the second diaphragm portion are provided with a mounting
portion which is provided so as to project to the end and to which one end of the voice coil
bobbin is attached, and a rib portion which is projected out on the back side of the first
diaphragm portion. The base material is impregnated with the thermosetting resin and molded,
the mounting part is molded by curing the thermosetting resin, and the rib part contains the base
material in their projecting parts and the thermosetting resin is hardened. It is molded.
[0009]
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Preferably, in the speaker diaphragm of the present invention, the maximum height h of the
projection of the rib portion is equal to or less than the diaphragm thickness t at the portion
excluding the rib portion of the first diaphragm portion, and the maximum of the projection of
the rib portion The small width w is equal to or greater than the diaphragm thickness t.
[0010]
Preferably, in the speaker diaphragm of the present invention, the rib portion is a radial rib
portion radially formed outward from the center side of the first diaphragm portion, and the
mounting portion and the radial rib portion are connected and integrally molded. It is done.
[0011]
In addition, preferably, in the speaker diaphragm of the present invention, the external shape
having the major axis and the minor axis is a substantially elliptical, track or rectangular speaker
diaphragm, and the central axis of the radial rib portion intersects with the major axis The angle
is less than 45 degrees.
[0012]
More preferably, in the speaker diaphragm of the present invention, the thermosetting resin is an
unsaturated polyester resin.
[0013]
Furthermore, a speaker of the present invention includes any of the above-described speaker
diaphragms of the present invention.
[0014]
Hereinafter, the operation of the present invention will be described.
[0015]
The speaker diaphragm according to the present invention includes the first diaphragm portion,
the second diaphragm portion integrally formed with the first diaphragm portion, and the back
side of the joint portion between the first diaphragm portion and the second diaphragm portion.
And a mounting portion to which one end of the voice coil bobbin is attached, and a rib portion
protruding to the back side of the first diaphragm portion.
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The first diaphragm portion and the second diaphragm portion are formed by impregnating the
substrate with the thermosetting resin, and the mounting portion is formed by curing the
thermosetting resin, so the speaker diaphragm and the voice are formed. A speaker is realized
that has high adhesive strength with the coil, reduces transmission loss, and improves the S / N
ratio.
[0016]
In addition, in the speaker diaphragm of the present invention, by providing the rib portion in the
first diaphragm portion, it is possible to reduce the peak dip on the sound pressure frequency
characteristic.
The rib portion is a radial rib portion radially formed outward from the center side of the first
diaphragm portion, and if the attachment portion and the radial rib portion are connected and
integrally formed, the diaphragm shape is an elongated shape Even in the case of a diaphragm (in
the case of a substantially elliptical, track-shaped or rectangular speaker diaphragm having a
major axis and a minor axis), it is possible to reduce peak dips in sound pressure frequency
characteristics .
When the radial rib portion is disposed such that the angle at which the central axis of the radial
rib portion intersects the major axis is smaller than 45 degrees, the rigidity of the portion of the
first diaphragm portion that easily causes split resonance is enhanced. Therefore, the peak dip is
more effectively reduced.
[0017]
Here, the rib portion is formed by curing the thermosetting resin including the base material in
the projecting portion thereof.
The protruding portion of the rib portion refers to a protruding portion as compared to the
surface of the speaker diaphragm without the rib, and is a portion where the diaphragm
thickness is increased by the amount of the protruding portion.
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That is, in the rib portion of the speaker diaphragm of the present invention, the thermosetting
resin is cured in a state in which the base material also enters the inside of the protruding
portion of the rib portion, so the configuration of the other first diaphragm portion It is formed
by material composition closer to.
As a result, as compared with the case where a rib portion formed of only a simple resin is
formed on the first diaphragm portion, the acoustic impedance in the rib portion can be matched,
and the Young's modulus or the internal loss value becomes closer. And the peak dip on the
sound pressure frequency characteristics can be reduced.
[0018]
In addition, a rib part contains a base material in more than half of largest height h of the
protrusion part, and the thermosetting resin with which the base material was impregnated
should just be hardened ¦ cured and shape ¦ molded.
Since the base material of the speaker diaphragm is required to be rigid, a material which
extends into the protrusion of the rib may be difficult to use because the rigidity may be
insufficient.
Therefore, the maximum height h of the projecting portion of the rib portion corresponds to the
rib portion of the first diaphragm portion so that the thermosetting resin cures in a state in
which the base material has a certain degree of penetration inside the projecting portion of the
rib portion. The minimum thickness w of the projection of the rib portion may be equal to or
greater than the diaphragm thickness t at the portion excluding the thickness t.
[0019]
In the speaker diaphragm of the present invention, the thermosetting resin is an unsaturated
polyester resin.
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Therefore, a speaker diaphragm having a first diaphragm portion, a second diaphragm portion, a
mounting portion, and a rib portion which has a high curing speed and a low curing temperature
is easy to manufacture and has excellent internal loss. can get.
[0020]
The speaker diaphragm of the present invention has high adhesive strength between the speaker
diaphragm and the voice coil, can reduce transmission loss, can improve the S / N ratio, has less
peak dip on sound pressure frequency characteristics, and can be reproduced A speaker with
excellent sound quality can be realized.
[0021]
In the speaker diaphragm of the present invention and the speaker using the same, the bonding
strength between the speaker diaphragm and the voice coil is high, the transmission loss can be
reduced, the S / N ratio can be improved, and the peak on the sound pressure frequency
characteristic The purpose of realizing a speaker with less dip, excellent reproduction sound
quality, and a second diaphragm portion in which the speaker diaphragm is integrally formed
with the first diaphragm portion, the first diaphragm portion, and the first A mounting portion
which is provided on the back side of the joint portion between the diaphragm portion and the
second diaphragm portion so as to be attached to one end of the voice coil bobbin and a rib
portion which is provided on the rear side of the first diaphragm portion; The first diaphragm
portion and the second diaphragm portion are formed by impregnating the substrate with the
thermosetting resin, and the mounting portion is formed by curing the thermosetting resin, and
the rib portions are formed by Based on the protrusion of By such a thermosetting resin is
molded and cured include, I realized.
[0022]
Hereinafter, although the speaker diaphragm by the preferable embodiment of this invention and
the speaker using the same are demonstrated, this invention is not limited to these embodiments.
[0023]
FIG. 1 is a schematic cross-sectional view of a speaker 100 according to a preferred embodiment
of the present invention.
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FIG. 2 is a view for explaining the speaker diaphragm 1 constituting the speaker 100. As shown
in FIG.
FIG. 3 is an enlarged view of an essential part of the speaker diaphragm 1.
The speaker 100 has a speaker diaphragm 1, a voice coil bobbin 2 bonded to the speaker
diaphragm 1, and a voice coil 3 wound around the lower end of the voice coil bobbin 2.
The voice coil 3 is disposed in the magnetic gap of the magnetic circuit 4 and drives the speaker
diaphragm 1 by displacing the inside of the magnetic gap according to the input signal.
[0024]
The speaker diaphragm 1 has a first diaphragm portion 5 and a second diaphragm portion 6
integrally formed with the first diaphragm portion 5. As required, the speaker diaphragm 1
includes an edge portion 11 integrally formed with the first diaphragm portion 5 (the edge
portion 11 may not be integrally formed). The first diaphragm portion 5 forms a cone-shaped
diaphragm, and forms an outer peripheral portion of the speaker diaphragm 1. The second
diaphragm portion 6 forms a dome-shaped diaphragm (which may have a function as a dust cap),
and forms an inner peripheral portion of the speaker diaphragm 1. By integrally molding the first
diaphragm portion 5 and the second diaphragm portion 6, the vibration of the voice coil bobbin
2 is made smoother at the joint portion between the first diaphragm portion 5 and the second
diaphragm portion 6. Since transmission can be performed (without reflection), transmission loss
can be prevented. The speaker diaphragm 1 further has a mounting portion 7 to which the voice
coil bobbin 2 is mounted by an adhesive. The mounting portion 7 is provided so as to protrude
on the back side of the speaker diaphragm 1 (specifically, a connection portion between the first
diaphragm portion 5 and the second diaphragm portion 6). The back side is the side to which the
voice coil bobbin 2 of the speaker diaphragm 1 is adhered. Further, the coupling portion means a
portion where the first diaphragm portion 5 and the second diaphragm portion 6 are coupled
and the vicinity thereof. In other words, the coupling portion is a position where the curved
surface of the speaker diaphragm 1 changes from concave to convex and the vicinity thereof.
Since the mounting portion 7 is projected not on the surface side of the speaker diaphragm 1 but
on the back side, it is necessary to form a bent portion in the first diaphragm portion 5 and the
second diaphragm portion 6 to form the mounting portion 7 There is no Therefore, since the
mounting portion 7 is not exposed on the surface side of the speaker diaphragm 1, the aesthetics
of the speaker diaphragm 1 become extremely excellent.
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[0025]
The mounting portion 7 is integrally formed with the first diaphragm portion 5 and the second
diaphragm portion 6. Since it is integrally molded, the manufacturing process is simplified, and
the attachment portion 7 can be prevented from being separated from the first diaphragm
portion 5 and the second diaphragm portion 6. The mounting portion 7 includes a first extending
portion 8 extending from the first diaphragm portion 5 to the back side and a second extending
portion 9 extending from the second diaphragm portion 6 to the back side. The bobbin bonding
groove 10 is defined between the first extending portion 8 and the second extending portion 9.
The thickness of the first extending portion 8 and the second extending portion 9 is preferably
0.5 to 20 mm. If it is smaller than 0.5 mm, the adhesive strength is insufficient, and if it is 20 mm
or more, the weight of the joint portion between the first diaphragm portion 5 and the second
diaphragm portion 6 is excessively increased, and the sound pressure is reduced. is there. One
end of the voice coil bobbin 2 is inserted into the bobbin bonding groove 10 of the mounting
portion 7, and the voice coil bobbin 2 is bonded in a state of being sandwiched by the first and
second extending portions. Here, since one end of the voice coil bobbin 2 is in contact with the
first diaphragm portion 5 and the second diaphragm portion 6, vibration in the Z direction of the
voice coil bobbin 2 does not go through the first and second extension portions. Directly to the
first diaphragm portion 5 and the second diaphragm portion 6. The vibration of the voice coil
bobbin 2 is transmitted without being reflected in the first diaphragm portion 5 and the second
diaphragm portion 6, as shown by Z1 and Z2 in FIG.
[0026]
In the present embodiment, the first diaphragm portion 5 and the second diaphragm portion 6 of
the speaker diaphragm 1 are formed by impregnating a base material with a thermosetting resin.
For example, the base material is a laminate including a natural fiber woven layer and a natural
fiber non-woven layer, and the thermosetting resin may be any suitable thermosetting resin, but
is preferably unsaturated polyester. It is. This is because the first diaphragm portion 5 and the
second diaphragm portion 6 having a high curing rate and a low curing temperature are easy to
manufacture and have excellent internal loss. The average diaphragm thickness t of the speaker
diaphragm 1 of the present embodiment is about 0.32 mm except for the protruding portion of
the rib portion 12 of the first diaphragm portion 5 described later.
[0027]
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9
As the substrate, any suitable woven or non-woven fabric may be employed depending on the
application and purpose. It may be a woven fabric or a non-woven fabric alone, or may be a
laminate having a plurality of non-woven fabrics, or a laminate of a woven fabric and a nonwoven fabric. The non-woven fabric typically includes para-aramid fibers, meta-aramid fibers,
rayon fibers, cotton fibers, ultra-high strength polyethylene fibers, polyarylate fibers and the like.
Examples of the woven fabric include poly (trimethylene terephthalate), polyethylene naphthalate
(PEN) fibers and the like. The woven or non-woven fibers may be natural fibers or inorganic
fibers as described above.
[0028]
The speaker diaphragm 1 is a track-shaped speaker diaphragm having an outer diameter of 12
× 6 cm having a major axis X and a minor axis Y, and the first diaphragm portion 5 of the
speaker diaphragm 1 is provided so as to protrude on the back side Provided with the rib portion
12. As will be described later, the rib portion 12 is formed by curing the thermosetting resin,
including the base material in the projecting portion thereof. Further, as illustrated, the rib
portions 12 are radial rib portions 12a to 12d formed radially outward from the center of the
first diaphragm portion 5, and the central axis a of the radial rib portion 12a and the major axis
X Is approximately 25 degrees. Since the mounting portion 7 and the radial rib portions 12a to
12d are connected and integrally molded, the strength in the long axis X direction of the first
diaphragm portion 5 having a larger area than the short axis Y direction is improved. . In other
words, the mounting portion 7 and the radial rib portions 12a to 12d increase the rigidity of the
portion where the split resonance of the elongated diaphragm is likely to occur. The maximum
height h of the projecting portion which is a portion of the rib portion 12 which protrudes to the
back side of the first diaphragm portion 5 is about 0.31 mm and is equal to or less than the
diaphragm thickness t. Further, the radial rib portions 12a to 12d of the present embodiment
have a rib shape in which the width increases toward the outer diameter, and the minimum width
w closest to the mounting portion is about 0.58 mm and the diaphragm thickness t or more The
maximum width is about 2.15 mm.
[0029]
FIG. 4 is an enlarged view of a cut surface of the speaker diaphragm 1 of the embodiment. FIG. 4
(a) is an O-X cut enlarged view of the attachment 7 (the first extension 8 and the second
extension 9), and FIG. 4 (b) is a B-B view of the radial rib 12a. 'It is a cut enlarged view. As shown
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in FIG. 4A, the first diaphragm portion 5 and the second diaphragm portion 6 are formed of a
resin including a base material, and the mounting portion 7 is formed of a resin. Preferably, the
mounting portion 7 is formed by curing a thermosetting resin used for the first diaphragm
portion 5 and the second diaphragm portion 6. That is, the mounting portion 7 is preferably
molded of unsaturated polyester. This is because the curing speed is high and the curing
temperature is low, so that manufacturing is easy and a mounting portion with excellent internal
loss can be obtained. Although details will be described later, at the same time as the
thermosetting resin is impregnated in the base material of the first diaphragm portion 5 and the
second diaphragm portion 6, the mounting portion 7 is heated to the shape portion of the
mounting portion 7 of the mold Since the curable resin is dropped and cured, the manufacture is
extremely simplified.
[0030]
Furthermore, since the mounting portion 7 is formed of only the thermosetting resin, the internal
loss is higher than the first diaphragm portion 5 and the second diaphragm portion 6 formed by
impregnating the substrate with the thermosetting resin. . For example, when the base material is
PEN fiber and the thermosetting resin is unsaturated polyester, the ratio of internal loss between
the mounting portion 7 and the first diaphragm portion 5 (and the second diaphragm portion 6)
The internal loss of the mounting portion 7 is 0.3 to 0.6, and the internal loss of the first
diaphragm portion 5 and the second diaphragm portion 6 is 0.1 ˜ 0.5). Therefore, the vertical
vibration of the voice coil bobbin 2 is attenuated by the high internal loss attachment 7 and is
not transmitted to the first diaphragm portion 5 and the second diaphragm portion 6. Therefore,
distortion or noise can be prevented from being generated due to the vertical vibration of the
voice coil bobbin 2, and the S / N ratio can be improved.
[0031]
On the other hand, as shown in FIG. 4B, the radial rib portions 12a to 12d are formed by curing
the thermosetting resin including the base material in their projecting portions. That is, as in the
case where the first diaphragm portion 5 and the second diaphragm portion 6 include the base
material over the entire diaphragm thickness t and the thermosetting resin is cured, the radial rib
portions 12 a to In the state 12d, the thermosetting resin is cured in a state in which the base
material also enters the inside of the protruding portion where the rib portion 12 protrudes. At
the end of the radial rib portions 12a to 12d, even if the base material is reduced and the ratio of
the thermosetting resin may be increased, as shown in FIG. 4 (b) It is preferred to include a
substrate. The height of the projecting portion, which is the portion of the rib portion 12
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11
projecting to the back side of the second diaphragm portion 6, is smaller than the diaphragm
thickness t, and the maximum height h is about 0.31 mm. You can get deep into the department.
Further, the minimum width w of the radial rib portions 12a to 12d of the present embodiment is
about 0.58 mm in the place closest to the mounting portion 7, and is equal to or more than the
diaphragm thickness t. Therefore, the radial rib portions 12a to 12d of the first diaphragm
portion 5 can be matched in acoustic impedance as will be described later in comparison with the
case where the rib portion made of only a simple resin is formed on the first diaphragm portion 5
It has the advantage of
[0032]
Next, a method of manufacturing the speaker diaphragm 1 will be described with reference to
FIG. The base material 501a is prepared by being wound around the supply device 501 in a roll,
and sent out from the supply device 501 according to the flow of the process. In order to prevent
deformation at the time of molding, both sides with respect to the feeding direction of the fed-out
base material 501a are movably supported by clamps 502.
[0033]
Next, the thermosetting resin is selectively supplied from the resin supply nozzle 503a to the first
diaphragm portion 5 and the second diaphragm portion 6 of the base 501a.
[0034]
Next, the base material 501a supplied with the thermosetting resin is heat-pressed using the
upper mold 504a and the lower mold 504b in the shape of the diaphragm 1.
The upper mold 504a has the shape of the surface (the first diaphragm portion 5 and the second
diaphragm portion 6) of the speaker diaphragm 1, and the lower mold 504b is the back surface
of the diaphragm 1 (the first diaphragm It has the shape of the part 5, the 2nd diaphragm part 6,
the attaching part 7, and radial rib part 12a-12d). As a result, the thermosetting resin is
impregnated into the first diaphragm portion and the second diaphragm portion of the substrate
501a by rolling and hardened to form the first diaphragm portion 5 and the second diaphragm
portion 6, At the same time, the thermosetting resin supplied to the shape portion of the
mounting portion 7 of the lower mold 504 b is cured to form the mounting portion 7. Since only
the lower mold 504b has the shapes of the attachment portion 7 and the radial rib portions 12a
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to 12d, the attachment portion 7 and the radial rib portions 12a to 12d are formed on the back
side of the speaker diaphragm 1. Finally, die cutting and peripheral cutting are performed to
obtain the diaphragm 1.
[0035]
In addition, as conditions (for example, mold temperature, press pressure, press time, mold
clearance) of heat press, any appropriate conditions may be adopted depending on the purpose
and the non-woven fabric substrate to be used. Typically, the mold temperature is 100 to 130 °
C., the heating time is 0.5 to 3 minutes, the pressure at the time of pressing is 15 to 25 kg / cm
<2>, and the mold clearance (thickness of the member for speaker obtained) Corresponds to 0.1
to 0.5 mm.
[0036]
EXAMPLES Hereinafter, the present invention will be specifically described by way of examples,
but the present invention is not limited to these examples. In the Examples and Comparative
Examples, parts and percentages are by weight unless otherwise indicated.
[0037]
An unsaturated polyester solution having the following composition was prepared: Unsaturated
polyester resin (manufactured by Nippon Shokubai Co., Ltd .; N 350 L): 100 (parts) Low
shrinkage agent (Nippon Yushi Co., Ltd .; Modiper S 501): 5 Perocta O (Nippon Yushi Co., Ltd.):
1.3 On the other hand, two layers of cotton fiber woven fabric (cotton count 20 density 40 x 40
(book / inch) basis weight 110 g / m ^ 2) on the front side and cotton non-woven fabric (in
between) 100% unbleached fibers bonded by the spunlace (water entanglement) method, basis
weight: 110 g / m ^ 2) and laminated to make a three-layer structure and cut into 18 cm square
substrate . A jig with a circular hole with a diameter of about 14 cm at the center of an
approximately 30 cm square stainless steel plate is used as a clamp, and the laminated substrate
is sandwiched between the two clamps, and then the above-mentioned unsaturated polyester
solution (about Drop 5 g) near the center of the clamped substrate. The diaphragm of FIG. 6 was
molded at 130 ° C. for 30 seconds with a matched die mold of diaphragm shape to obtain a
diaphragm with a diameter of 12 × 6 cm and a thickness of 0.32 mm. Since the lower mold is
only dug, the mounting portion 7 is formed by curing the unsaturated polyester resin only on the
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back side of the speaker diaphragm 1. In addition, although the radial rib portions 12a to 12d
are formed on the back side of the first diaphragm portion 5, since the digging that defines the
maximum height h of the projecting portion formed only on the lower mold is not deep, The
thermosetting resin is cured in a state in which the base material also enters the inside of the
protruding portion of the rib 12.
[0038]
The specific gravity, Young's modulus, and internal loss of the first diaphragm portion 5 (not
including the rib portion 12), the rib portion 12, and the mounting portion 7 were measured for
the obtained diaphragm. The measurement results are shown in Table 1 below.
[0039]
As shown in Table 1, the specific gravities of the first diaphragm portion 5, the rib portion 12
and the attachment portion 7 do not change so much. On the other hand, the Young's modulus of
the first diaphragm portion 5 (and the second diaphragm portion 6) is about 3.9 times the
Young's modulus of the mounting portion 7, and the internal loss of the mounting portion 7 is
the first diaphragm portion It is about 7.78 times the internal loss of 5 (and the second
diaphragm portion 6). Therefore, the vertical vibration of the voice coil bobbin is attenuated by
the mounting portion 7 having a high internal loss, and is hardly transmitted to the first
diaphragm portion 5 (and the second diaphragm portion 6). Therefore, the occurrence of
distortion can be prevented. Further, the specific gravity, Young's modulus and internal loss of
the rib portion 12 of the first diaphragm portion 5 are intermediate values between the first
diaphragm portion 5 and the mounting portion 7 and the internal loss value is relatively first It is
close to the value of diaphragm part 5. That is, compared with the case of providing the rib
portion formed only with resin as in the attachment portion 7, the rib portion 12 in which the
base material also penetrates into the inside of the projecting portion has a Young's modulus
value of the first diaphragm portion 5. As the value of the internal loss will not be extremely
different, the acoustic impedance at the rib 12 will be matched, the reflection of vibration will be
less, and the peak dip on the sound pressure frequency characteristic will be more It can be
reduced. Although the preferred embodiments of the present invention have been described
above, the present invention is not limited to these embodiments.
[0040]
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In addition, the rib part 12 provided in the 1st diaphragm part 5 is not limited to the radial rib
parts 12a-12d radially formed as mentioned above. The width of the ribs of the radial rib
portions 12a to 12d may be a fixed width, and the number of ribs may be more than four. The rib
portion 12 provided on the first diaphragm portion 5 in the case where the diaphragm shape is
an elongated diaphragm (in the case of a speaker diaphragm having an outer shape having a
major axis and a short axis that is substantially elliptical, track or rectangular) And other rib
shapes such as, for example, further having a plurality of radial ribs formed in parallel to each of
the radial rib portions 12a to 12d, provided that the attachment portion and the rib portion are
connected and integrally formed. It may be Also, the rib portion 12 may be parallel to the major
and minor axes. By forming the rib portion 12 in which the base material also enters into the
inside of the projecting portion, the acoustic impedance in the rib portion 12 can be matched as
compared with the case where the rib portion formed only of resin as in the mounting portion 7
Thus, it is possible to reduce the reflection of vibration and to reduce the peak dip on the sound
pressure frequency characteristic.
[0041]
The speaker diaphragm of the present invention can be suitably applied to a speaker used for
various applications (home use, car use). Furthermore, the present invention can be applied to
any speaker regardless of the characteristics, such as a woofer reproducing particularly a low
frequency region or a tweeter reproducing a high frequency region. Further, the speaker
diaphragm of the present invention is applicable not only to the speaker but also to a
microphone provided with a slender diaphragm.
[0042]
It is a figure explaining the speaker 100 by preferable embodiment of this invention. (Example 1)
It is a figure explaining the speaker diaphragm 1 by preferable embodiment of this invention.
(Example 1) It is a figure explaining the speaker diaphragm 1 by preferable embodiment of this
invention. (Example 1) It is a figure explaining the speaker diaphragm 1 by preferable
embodiment of this invention. (Example 1) It is a figure which shows the manufacturing method
of the speaker diaphragm 1 by preferable embodiment of this invention.
Explanation of sign
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[0043]
DESCRIPTION OF SYMBOLS 1 speaker diaphragm 2 voice coil bobbin 3 voice coil 4 magnetic
circuit 5 1st diaphragm part 6 2nd diaphragm part 7 attachment part 8 1st extending part 9 2nd
extending part 10 bobbin adhesion groove 11 edge part 12 rib part
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