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JP2002176698

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2002176698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustoelectric converter, and more particularly to an acoustoelectric converter in which the
structure of a diaphragm vibrated by sound is improved.
[0002]
2. Description of the Related Art An acoustoelectric conversion device is known which detects a
vibration displacement by converting the vibration displacement of a diaphragm due to sound
into a change in the amount of light received and taking it out as an electrical signal. This
acoustoelectric conversion device is utilized for a microphone etc. The light emitting element and
the light receiving element are disposed facing the thin film diaphragm which is stretched on the
support member, and the light emitting element emits radiation to the diaphragm. It is
configured to detect the vibration displacement due to the sound of the diaphragm by receiving
the reflected light of the light by the light receiving element and extracting it as an electric signal.
[0003]
FIG. 6 shows the structure of a diaphragm used in such an acoustoelectric converter. As shown in
FIG. 6 (B), the diaphragm 1 is made of, for example, an aluminum foil having a thickness of about
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2 μ, and is used in a flat film shape without performing a forming process or the like. The
diaphragm 1 in the form of a thin film is used in a stretched state on a support member 2 such as
a ring having an opening at the center. As shown in FIG. 6A, light is emitted from the light
emitting element 4 provided at a position facing the diaphragm 1 to the diaphragm 1, and light
reflected by the diaphragm 1 is received by the light receiving element 5. It receives light and
takes it out as an electric signal.
[0004]
However, when such a conventional flat thin film diaphragm is used, the frequency characteristic
of the diaphragm 1 is not flat, and resonance occurs at a specific frequency of the diaphragm 1.
The amplitude width of the diaphragm 1 itself becomes narrow at frequencies other than the
resonance frequency. Therefore, in the structure of the conventional diaphragm as shown in FIG.
6, the amplitude for detecting a wide range of frequencies is hard to come out, and as a result, in
the acoustoelectric converter using the conventional light, the reproduction band of sound
becomes narrow. There was a drawback.
[0005]
Further, since the diaphragm 1 is made of an extremely thin film-like material such as aluminum
foil, in order to maintain the flatness of the diaphragm 1, it is necessary to prevent wrinkles or
sags. Therefore, it is necessary to adhere the diaphragm 1 to the support member 2 while
preventing the generation of wrinkles and sag while applying a predetermined tension to the
aluminum foil or the like. That is, while maintaining the diaphragm 1 in a stretched state, the
support member 2 at the outer peripheral portion of the diaphragm 1 must be stretched by
means such as adhesion.
[0006]
As described above, in the conventional diaphragm structure, the outer peripheral portion of the
diaphragm 1 is fixed to the support member 2 such as a ring while the diaphragm 1 is kept flat
at a predetermined tension. As described above, in the conventional diaphragm structure, since
the diaphragm 1 is fixed by applying tension, the compliance of the diaphragm 1 itself becomes
low. Therefore, the amplitude width of the diaphragm 1 is further reduced, and the amplitude
width for detecting a wide range of frequencies is further reduced. When a surface emitting laser
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element is used as the light emitting element 4, the amount of change in the reflected light of
light reflected on the surface of the diaphragm 1 is small because the amplitude width is narrow
and detection by the light receiving element 5 becomes extremely difficult .
[0007]
The present invention has been made to solve the problems of the diaphragm used in the abovedescribed conventional acoustoelectric converter, and provides an acoustoelectric converter
having a diaphragm structure suitable for high performance and mass production. The purpose is
[0008]
SUMMARY OF THE INVENTION According to the present invention, a light emitting element and
a light receiving element are disposed opposite to a thin film-like diaphragm tensioned on a
support member, and the light emitting element emits light to the diaphragm. In the
acoustoelectric conversion device for detecting the vibration displacement due to the sound of
the diaphragm by receiving the reflected light of the light by the light receiving element and
extracting it as an electric signal, the compliance of the diaphragm is raised to the outer
peripheral portion of the diaphragm A suspension member is attached, and the diaphragm is
stretched on the support member via the suspension member.
[0009]
In the acoustoelectric converter, the diaphragm may be formed in a dome shape or a cone shape.
.
In the acoustoelectric conversion device, a rib of a desired shape can be disposed at a desired
position of the diaphragm.
In the acoustoelectric converter, the diaphragm can be made of a resin film, a metal foil, or a
laminate of a resin film and a metal foil. In the acoustoelectric converter, the suspension member
may be integrally molded with the diaphragm using the same material as the diaphragm. A
corrugation may be integrally molded with the diaphragm on the outer peripheral portion of the
diaphragm, a flat portion having a predetermined dimension width connected to the outer
peripheral portion of the corrugation may be provided, and the flat portion may be attached to
the support member. In the acoustoelectric converter, the suspension member is a corrugation
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molded of a material different from that of the diaphragm, and a sticking portion having a
predetermined dimension width continuous with the inner and outer peripheral portions of the
corrugation is provided. The attachment portion can be attached to the support member and the
diaphragm. The corrugation can be molded from a member obtained by applying a rubber coat
to a woven fabric.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail below. The shape and structure of the diaphragm used in the acoustoelectric
converter according to the present invention are shown in cross-sectional views in FIGS. In the
embodiment shown in FIG. 1, a gap having a predetermined size is provided between the outer
peripheral portion of the diaphragm 1 and the inner peripheral portion of a support member
such as a ring for stretching the diaphragm 1, The suspension 3 is configured by applying a
predetermined amount of an agent or an acrylic dump agent or the like and curing the agent to a
predetermined hardness. The adhesive, dumping agent, and the like reach a predetermined
strength after a predetermined time, and naturally reach a predetermined hardness. The
suspension 3 thus formed supports the diaphragm 1 on the support member 2. Thus, the
suspension 3 provided on the outer peripheral portion of the diaphragm 1 makes it easy for the
diaphragm to oscillate and raises the compliance of the diaphragm 1.
[0011]
FIG. 2 shows another embodiment, in which a flat diaphragm is used as the diaphragm 1 and a
rising portion or a falling portion 12 is provided on the outer peripheral portion of the flat
diaphragm 1. . The diaphragm 1 can be stably coupled to the support member 2 by providing
such a rising portion or a falling portion 12. Further, as shown in FIG. 2, a rib 11 having a desired
shape can be provided at a desired position of the diaphragm 1 by means such as integral
molding. By providing the ribs 11 in this manner, the compliance of the diaphragm 1 can be
further raised.
[0012]
FIG. 3 shows still another embodiment of the present invention, in which the diaphragm 1 is
molded in a dome shape. When such a dome-shaped diaphragm 1 is used, the strength is
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increased as compared to a flat diaphragm, so that it is possible to further expand the sound
reproduction band.
[0013]
In the embodiment shown in FIG. 4, the diaphragm 1 is molded into a dome shape, and further, a
corrugation 3a is integrally molded on the outer peripheral portion of the dome and used as a
suspension member. A flat portion 3b having a predetermined dimension width is provided on
the outer peripheral portion of the corrugation 3a, and the flat portion 3b is attached to the
surface of the support member 2 as a bonding margin portion of the diaphragm 1. Accordingly,
the outer peripheral portion of the corrugation 3 a is in a state of being connected to the surface
of the support member 2, and the corrugation 3 a becomes a suspension 3 for supporting the
dome-shaped diaphragm 1.
[0014]
In FIG. 5, the diaphragm 1 is molded into a dome shape, and another material different from the
diaphragm 1, for example, a member for the suspension 3 in which a woven fabric is coated with
a rubber is similar to the corrugation 3a shown in FIG. The corrugation 3c is formed so as to
have a cross-sectional shape, and the bonding margin portions 3d and 3e continuously formed
on the inner peripheral portion and the outer peripheral portion of the corrugation 3c are
integrally formed. The bonding margin 3 d is fixed to the outer peripheral portion of the domeshaped diaphragm 1, and the bonding margin 3 e is fixed to the surface of the support member
2. As a result, a corrugation 3 c of a material different from that of the dome-shaped diaphragm 1
is connected to the support member 2, and this corrugation 3 c becomes a suspension 3 for
supporting the dome-shaped diaphragm 1.
[0015]
In the embodiment described above, the specific resin film formed in the heat and pressure
molding was molded into a flat shape or a dome shape, and a rib was further provided to form
the diaphragm 1. It doesn't matter if you use It is also possible to coat a metal such as nickel or
aluminum on the surface of the diaphragm 1 by means of vapor deposition or the like after
molding of the resin film.
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[0016]
As described above in detail, according to the present invention, by providing the suspension on
the outer peripheral portion of the diaphragm, the outer peripheral portion of the diaphragm is
not fixed to the support member as in the prior art, and the compliance is improved. I tried to
raise it. Therefore, the amplitude width of the diaphragm can be significantly increased. As a
result, since the amount of change of the reflected light is large, there is an advantage that the
detection of vibration becomes extremely easy.
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