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JP2005303775

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DESCRIPTION JP2005303775
PROBLEM TO BE SOLVED: To be able to effectively lower the lowest resonance frequency F0 by
equipping a V-shaped groove to an edge portion of a diaphragm for acoustic converter, and to
suppress generation of distortion in acoustic characteristics on a diaphragm main body, Get high
quality acoustics. SOLUTION: A roll-type edge portion 35 is integrally formed on the outer
periphery of the diaphragm main body 33, and a plurality of V-shaped grooves 37 are tangential
to the outer peripheral edge of the diaphragm main body 33 in this edge portion 35. In the
acoustic transducer diaphragm 31 formed in each of the V-shaped grooves 37, both end
positions are respectively separated from the inner periphery and outer periphery of the edge
portion 35, and with respect to the roll height H of the edge portion 35, By setting the depth h of
the V-shaped groove 37 in the range of (1/3) H h h ((2/3) H, sufficient amplitude can be given to
the diaphragm body 33 even with a small driving force. Thus, the lowest resonance frequency F0
can be effectively lowered. [Selected figure] Figure 3
Vibrator plate for acoustic converter
[0001]
The present invention relates to a diaphragm for acoustic converter, and in particular, a roll-type
edge portion is integrally formed on the outer periphery of a circular diaphragm main body, and
a plurality of V-shaped grooves are formed on this edge portion. The present invention relates to
a diaphragm for an acoustic transducer formed along a tangential direction with respect to the
outer peripheral edge of the diaphragm body.
[0002]
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The acoustic transducer converts an electrical signal input from the outside into a vibration of
the diaphragm by converting it into vibration of the diaphragm like a speaker unit and outputs it,
conversely, an acoustic signal input from the outside like a microphone unit Can be roughly
divided into ones that are received by a diaphragm, converted into electrical signals, and output.
1 and 2 show a conventional example of an acoustic transducer used as a speaker unit.
[0003]
The speaker unit 1 shown here is a small-aperture unit used for a portable radio or the like, and
the structure is such that the magnet 6 and the center pole 7 are fixed to the central portion of
the bottomed cylindrical support yoke 5 There is. The magnet 6 and the center pole 7 are fixed
so that an air gap 8 is formed between the outer peripheral surface of the center pole 7 and the
inner peripheral surface of the support yoke 5. The outer peripheral edge of the diaphragm 2 is
fixed to the edge mounting portion 4 a of the outer peripheral edge of the frame 4 provided on
the opening end side of the support yoke 5.
[0004]
The diaphragm 2 has a roll-shaped edge 22 integrally formed on the outer periphery of a circular
diaphragm main body 21, and a plurality of V-shaped grooves 24 are formed on the edge 22 of
the diaphragm main body 21. It is formed along the tangential direction with respect to the outer
peripheral edge. In the case of the illustrated example, the V-shaped groove 24 is formed from
the back surface side of the edge portion 22. Therefore, the front appearance of the edge portion
22 is in the form of a ridge having a V-shaped cross section. Further, on the back surface side of
the outer periphery of the diaphragm main body 21, the voice coil 3 loosely fitted to the air gap
8 is bonded and fixed.
[0005]
In the speaker unit 1 described above, the magnetic circuit constituted by the support yoke 5, the
magnet 6, the center pole 7 and the like concentrates the magnetic flux in the air gap 8, and the
voice coil 3 disposed in the magnetic flux When input, the voice coil 3 vibrates in the axial
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direction according to the input electric signal. The vibration of the voice coil 3 causes the
diaphragm 2 to be amplitude-driven to generate a sound.
[0006]
The V-shaped groove 24 provided in the edge portion 22 of the diaphragm 2 functions as a
reinforcing rib to improve the strength of the edge portion 22 and, at the same time, elastically
opens and closes the groove width according to the amplitude of the diaphragm main body 21. It
is known that the deformation is effective as a means for reducing the minimum resonance
frequency F0 by facilitating a large amplitude of the diaphragm main body 21. Further, the Vshaped groove 24 divides the resonance wave generated concentrically on the diaphragm main
body 21 and the edge portion 22 and is also effective for preventing the deterioration of the
sound quality due to the resonance of the so-called axisymmetric resonance mode.
[0007]
By the way, if the V-shaped groove 24 is too shallow, even if the groove width is opened and
closed with the amplitude of the diaphragm main body 21, the displacement amount in the
amplitude direction of the diaphragm can not be taken large. The effectiveness as a means to
lower the resonance frequency F0 becomes thin. Therefore, until now, a technology has been
proposed in which the depth of the groove of the V-shaped groove 24 is set deeper than onethird of the height of the roll of the edge portion 22 (for example, Patent Document 1) reference).
[0008]
In addition, when the edge portion 22 is easily bent in the circumferential direction by arranging
a large number of V-shaped grooves 24 in a circumferential direction, distortion in the
circumferential direction occurs in the diaphragm body 21 at the time of the amplitude of the
diaphragm body 21. It causes distortion that reduces the sound quality. Therefore, as shown in
FIG. 1, a technique is proposed in which reinforcing V grooves 25 extending in the
circumferential direction are formed between adjacent V-shaped grooves 24 (see, for example,
Patent Document 2).
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[0009]
JP-A-11-313391 JP-A-9-224297
[0010]
However, according to the research of the inventor of the present invention, the V-shaped groove
24 formed on the edge portion 22 in the tangential direction with respect to the outer periphery
of the diaphragm main body 21 has an amplitude of the diaphragm if the depth of the groove is
too shallow. Since the displacement amount with respect to the direction can not be taken large
and the effectiveness as a means for lowering the lowest resonance frequency F0 becomes thin,
the groove depth of the V-shaped groove 24 is set to the roll of the edge portion 22 as in Patent
Document 1. It is important to set it deeper than 1/3 of the height of.
But that alone is not enough.
[0011]
If the depth of the V-shaped groove 24 is too deep, it is possible to increase the amount of
displacement of the diaphragm with respect to the amplitude direction, but the restorability after
large displacement decreases, or as a reinforcing rib If the function is too strong and the driving
force of the voice coil 3 is not large, there arises a problem that the diaphragm body 21 can not
be provided with an appropriate amplitude. Therefore, it will be an important issue in the future
to make the reference of the optimum depth so that the depth of the V-shaped groove 24
provided in the edge portion 22 does not become too deep.
[0012]
Further, in the case of the conventional diaphragm 2, since the end portion of the V-shaped
groove 24 provided in the edge portion 22 reaches the outer periphery of the diaphragm main
body 21, the V-shaped groove 24 is deformed. There is also a problem that distortion is directly
transmitted from the V-shaped groove 24 to the outer periphery of the diaphragm main body 21
and distortion on the diaphragm main body 21 is likely to occur.
[0013]
The problem to be solved by the present invention is the problem that the driving of the
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diaphragm becomes difficult because the depth of the V-shaped groove provided in the edge is
too deep, which occurs in the above-mentioned prior art. The problem that the deformation of
the V-shaped groove provided in the above becomes a cause of causing distortion in the
diaphragm main body can be mentioned as an example.
[0014]
In the diaphragm for acoustic converter according to claim 1, an edge portion of a roll-shaped
longitudinal section is integrally formed on the outer periphery of a circular diaphragm main
body, and a plurality of V-shaped grooves are formed in the edge portion. A diaphragm for an
acoustic transducer, which is formed along a tangential direction with respect to the outer
peripheral edge of the diaphragm body, and each V-shaped groove has both end positions
separated from the inner periphery and outer periphery of the edge portion by a predetermined
distance respectively The length is set as described above, and the depth h of the V-shaped
groove is in the range of (1/3) H ≦ hh (2/3) H with respect to the roll height H of the edge
portion. It is characterized by having set.
[0015]
Hereinafter, preferred embodiments of a diaphragm for acoustic converter according to the
present invention will be described in detail with reference to the drawings.
3 and 4 show an embodiment of the diaphragm for acoustic converter according to the present
invention, and FIG. 3 is a front view of the diaphragm for acoustic converter according to the
embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the line B-B
of FIG.
[0016]
The acoustic transducer diaphragm 31 of this embodiment is used for a small diameter speaker
unit or the like used for a portable radio or the like.
The acoustic transducer diaphragm 31 has a roll-shaped edge portion 35 integrally formed on
the outer periphery of a circular diaphragm main body 33, and a plurality of V-shaped grooves
37 are formed in the edge portion 35. Are formed substantially tangentially to the outer
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peripheral edge of the diaphragm main body 33.
[0017]
In the case of the present embodiment, the diaphragm main body 33 and the edge portion 35 are
integrally formed by press molding of a synthetic resin film such as polypropylene and
polycarbonate.
Further, the V-shaped groove 37 on the edge portion 35 is also formed by press molding. In the
case of the present embodiment, the shape of the diaphragm main body 33 is a dome shape
convex on the front side, and the edge portion 35 is a roll type convex on the front side similar to
the diaphragm main body 33.
[0018]
A substantially cylindrical voice coil 39 is fixed to the inner peripheral edge on the back surface
side of the edge portion 35 by an adhesive. Although not shown, the outer peripheral edge of the
edge portion 35 is a flat flange portion, and this flat flange portion is fixed to the edge mounting
portion of the frame of the speaker unit.
[0019]
As shown in FIG. 3, each V-shaped groove 37 formed in the edge portion 35 has a length L set
such that both end positions are separated from the inner periphery and outer periphery of the
edge portion 35 by predetermined distances S1 and S2, respectively. ing. Further, as shown in
FIG. 4, the depth h of the V-shaped groove 37 is set in the range of (1/3) H ≦ h ≦ (2/3) H with
respect to the roll height H of the edge portion 35. doing.
[0020]
In the diaphragm 31 for an acoustic converter described above, the depth h of the groove of the
V-shaped groove 37 provided in the edge portion 35 can be maintained in the optimum range
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which is neither too shallow nor too deep. That is, since the depth of the V-shaped groove 37 is
too shallow, displacement of the diaphragm in the amplitude direction is not insufficient, and the
depth of the V-shaped groove 37 is too deep. There is no problem that the function as a rib is too
strong to require a large driving force for the amplitude of the diaphragm body 33.
[0021]
Therefore, the large amplitude of the diaphragm main body 33 can be realized without
increasing the driving force of the voice coil 39, and the minimum resonance frequency F0 can
be effectively lowered by the provision of the V-shaped groove 37. Moreover, as shown in FIG. 3,
since the end of the V-shaped groove 37 does not reach the outer peripheral edge of the
diaphragm main body 33, the V-shaped groove 37 is deformed by the deformation of the Vshaped groove 37 during the amplitude. From this, distortion is not transmitted to the diaphragm
main body 33, and generation of distortion in the acoustic characteristics on the diaphragm main
body 33 can be suppressed, and high-quality acoustic characteristics can be obtained.
[0022]
Furthermore, in the case of the present embodiment, since the diaphragm main body 33 has a
dome shape that can exhibit acoustic characteristics in a wider angle range, even with a small
diameter diaphragm, directivity is wide and highly efficient acoustic characteristics are ensured.
The directivity of the small-sized acoustic transducer and the acoustic characteristics of the bass
region can be improved by using the small-sized acoustic transducer incorporated in a mobile
phone, a headphone, or the like.
[0023]
In addition, in order to confirm the effect of the above this embodiment, about the Example of a
structure according to the diaphragm 31 for acoustic transducers of the said embodiment, and
the diaphragm for acoustic transducers of Comparative Examples 1 and 2, The degree of
influence of the distortion generated on the diaphragm main body on the frequency
characteristics, the lowest resonance frequency F0, and the like were compared and measured.
[0024]
In Comparative Example 1, the inner and outer diameters of the diaphragm main body and the
edge portion, the length L of the V-shaped groove, and the like were the same as those of the
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embodiment of the present invention.
However, the depth of the groove of the V-shaped groove formed in the edge portion was outside
the setting range of the above embodiment.
Further, in the case of Comparative Example 2, the V-shaped groove in Comparative Example 1
was changed to a length in which the end of the V-shaped groove reaches the outer periphery of
the diaphragm main body as in the conventional case.
[0025]
As a result of comparative measurement for the above-described example and comparative
examples 1 and 2, as shown in the above embodiment, the predetermined separation distance is
set so that the end of the V-shaped groove 37 does not reach the outer periphery of the
diaphragm main body 33 It has been confirmed that securing S1 greatly contributes to the
prevention of the occurrence of distortion. Also, it is extremely effective to lower the lowest
resonance frequency F0 by restricting the depth h of the V-shaped groove 37 to the range of
(1/3) H ≦ h ≦ (2/3) H. It could be confirmed. Further, according to the research of the inventor
of the present application, when the depth h of the V-shaped groove 37 is more preferably set to
about half of the roll height H of the edge portion 35, the lowest resonance frequency F0 It could
be confirmed that it was more effective for the descent of
[0026]
The shape of the diaphragm main body in the diaphragm for acoustic converter according to the
present invention is not limited to the dome shape shown in the above embodiment. For example,
it is also possible to make the diaphragm body into a cone shape. However, if wide-angle
directivity is required for use in a small diameter acoustic transducer, it is preferable to use a
dome shape.
[0027]
Moreover, the material of the diaphragm for acoustic converter is not limited to the
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polypropylene and polycarbonate shown in the above embodiment. It is also conceivable to make
the diaphragm body and the edge portion different in material.
[0028]
Further, the diaphragm according to the present invention is not limited to the use to the speaker
unit shown in the above embodiment, but can be used to the microphone unit.
[0029]
As described above in detail, in the diaphragm 31 for an acoustic converter according to the
embodiment of the present invention, the edge portion 35 having a roll-shaped longitudinal
section is integrally formed on the outer periphery of the circular diaphragm main body 33.
Reference numeral 35 denotes an acoustic transducer diaphragm 31 in which a plurality of Vshaped grooves 37 are formed in a tangential direction with respect to the outer peripheral edge
of the diaphragm main body 33, and each V-shaped groove 37 has both end positions Is set to be
separated from the inner periphery and outer periphery of the edge portion 35 by a
predetermined distance, respectively, and the depth h of the V-shaped groove 37 is set to 1 3) H
≦ h ≦ (2/3) H is set.
Therefore, the depth of the groove of the V-shaped groove 37 provided in the edge portion 35 of
the diaphragm for acoustic converter 31 can be maintained in the optimum range which is
neither too shallow nor too deep. That is, since the depth of the groove of the V-shaped groove
37 is too shallow, the displacement amount of the diaphragm 31 for the acoustic converter does
not run short, and the depth of the groove of the V-shaped groove 37 is deep There is no
problem that the function as a reinforcing rib is too strong and the amplitude of the diaphragm
body 33 requires a large driving force. Therefore, a large amplitude of the diaphragm body 33
can be realized without increasing the driving force of the voice coil, and the minimum resonance
frequency F0 can be effectively lowered by the provision of the V-shaped groove. Moreover,
since the end of the V-shaped groove 37 does not reach the outer peripheral edge of the
diaphragm main body 33, distortion is transmitted from the V-shaped groove 37 to the
diaphragm main body 33 due to the deformation of the V-shaped groove 37 at the time of
amplitude. It is possible to obtain high-quality acoustic characteristics by suppressing the
occurrence of distortion in the acoustic characteristics on the diaphragm main body 33.
[0030]
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It is a front view of the speaker unit using the diaphragm for acoustic converters of the past. It is
sectional drawing in alignment with the AA of FIG. It is a front view of one embodiment of the
diaphragm for acoustic transducers concerning the present invention. It is sectional drawing in
alignment with the BB line of FIG.
Explanation of sign
[0031]
31 diaphragm for acoustic converter 33 diaphragm main body 35 edge portion 37 V-shaped
groove H height of roll at edge portion h groove depth of V-shaped groove
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