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DESCRIPTION JPS51150321

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DESCRIPTION JPS51150321
Patent request 3. Patent applicant address 1st, 1st and 6th names in Ichiyokucho, Chiyoda-ku,
Tokyo Name (422) Nippon Telegraph and Telephone Public Corporation Rei Yonezawa [Face]
Japan Patent Office 0 JP-A-5 JP 51-150 210 1 (1976) 12.23 Internal Serial Number Specification
1, Title of Invention
, Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer. For example, a vibrating film is used for an electroacoustic transducer such as a
microphone or a speaker, and this vibrating film is being changed from a conventional metal thin
film to a piezoelectric thin film. With piezoelectric thin films, when each electrode is formed on
both sides of this film and the film is expanded or contracted, an electric potential difference is
generated between the electrodes according to the degree of expansion and contraction.
Depending on the property of the film, the film has a property to expand and contract, and there
is, for example, a high polymer vibrating film and the like. Heretofore, as a microphone using this
piezoelectric thin film, one shown in the explanatory view of the main part of FIG. 1 is known. In
the container-like frame 1 in FIG. Tb, the urethane foam 2 whose surface is raised spherically is
fixed and disposed, and on this upper surface, film-like electrodes 3 and 4 are formed on the
entire front surface and the entire rear surface. The produced bipolymer vibrating film 5 is
disposed so as to have no gap with the urethane foam 2. Then, for the purpose of fixing and
protecting the bipolymer vibrating film 5 from external damage, a covering body 6 is integrated
with the frame 1 by sandwiching the end of the bipolymer vibrating film 5. The upper surface of
the cover 6 is provided with a plurality of holes T so that sound waves from the outside vibrate
the bipolymer vibrating film sufficiently. As described above, by making the surface spherical and
interposing the urethane foam 2 between the frame 1 and the bipolymer vibrating film 5 in a
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spherical shape, each portion of the bipolymer vibrating film 5 is given uniform tension. In the
state, the Hay Polymer vibrating film 5 slightly vibrates in the direction perpendicular to the film
surface (arrow A) by the sound wave from the outside so that a large EndPage 1 expansion /
contraction (arrow B) is performed. However, in the electro-acoustic transducer having such a
configuration, the quality of the urethane foam changes with temperature or humidity, and the
curvature or acoustic constant of the urethane foam also changes. Therefore, it has the
disadvantage that an electroacoustic transducer having uniform frequency characteristics can
not be obtained with aging. Even in the case of a large amount of tfc biopsies, the curvature of
the urethane foam contained in the individual 'electro-acoustic transducers will vary, so the
curvature of the urethane foam or the acoustic constant is different 9 and has uniform frequency
characteristics. There is a possibility that an electroacoustic transducer can not be obtained. It is
an object of the present invention to obviate such drawbacks and to provide an electroacoustic
transducer having uniform frequency characteristics both with aging and in t7 IC mass
production.
In order to achieve such an object, the basic configuration of the present invention will be
described by fixing the end of the vibrating membrane to the taber portion of the substrate
having the taber, and covering the central portion of the vibrating membrane. FIG. 2 is a crosssectional view showing an embodiment of the electro-acoustic transducer according to the
present invention. This figure shows a diaphragm fixing device for a microphone, which is a
container-like metal frame 11 having a circular bottom, a hole 12 is formed on the bottom, and
an inner side of the upper end of the nine-piece surface is a taver 11 'a is formed. An insulating
ring 13 is fixed to the lower end of the side surface of the frame 11. The inner diameter of the
upper portion of the side surface is substantially equal to the inner diameter of the frame 11 and
the center of the side surface is formed in the frame 11. A tapered taber 15m is formed at the
same angle as the tapered tab 11a and is wider than this, and the inner diameter of the side face
of the lower portion is substantially equal to the outer diameter of the insulating ring 13. Then,
the covering body 15 is in each of the frame bodies 11 is a taber 11a. The end of the bipolymer
vibrating film 16 having a diameter larger than the inner diameter of the lower part side surface
of the covering member 15 in the taber 15m is inserted and held in place 9, and the lower end of
the surface is crimped by the insulating ring 13K (see FIG. Ic) is integrated as in the middle
arrow. At this time, since the diameter of the bipolymer vibrating film 16 is larger than the inner
diameter of the lower side of the broken portion 15 in a state where the seven sides are held by
the tabers 1111 and 15 皐, the bipolymer vibrating film is Since a bending moment is applied to
the 16th surface, the spherical KID is increased. The bipolymer vibrating film 16 is one in which
film-like electrodes 11 and 18 are formed on the entire front surface and the entire rear surface.
In the electro-acoustic transducer configured in this manner, the frame 11 made of metal and the
covering 15 are electrically separated by the insulating ring 13, and the frame 11 is one of the
electrodes of the bipolymer vibrating film Since the cover body 15 is connected to the other
electrode 17 rc, the frame 11 and the cover body 15 are taken out as electrodes, and the electric
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signal obtained by converting the vibration of the bipolymer vibrating film 16 is * p. It can be put
out. In this way, it is possible to fix the bipolymer vibrating film so as to form a spherically
curved surface tJ without using urethane foam, so that the failure due to the quality change of
the urethane foam, because the uniform frequency characteristics can not be obtained And when
the light defects can be eliminated. Since the angle of the Taber and the diameter of the
bipolymer vibrating film are kept constant in mass production, the curvatures of the hypo and
limmer vibrating films are heated uniformly.
Therefore, uniform frequency characteristics can be obtained. By integrating the frame body 11
and the covering body 15 by caulking, there is no need to use a fixing jig or an adhesive or the
like different from VC% as in the prior art, so that assembly is easy, inexpensive and massproduced. Have the effect of In the present embodiment, the bottom single-hole 12 of the frame
11 is provided, but this is the ninth one which is surrounded by the bipolymer vibration 1116
and the frame 11 and keeps the air pressure in nine spaces constant with the atmosphere. It is
not necessary. Although the lower bipolymer vibrating film is used as a vibrating film in the
nineteenth embodiment, the present invention is not limited to this film, and other piezoelectric
vibrating films or other metal films can be applied to have EndPage: 2. Furthermore, although the
configuration of the microphone is described as an example in the present embodiment, the
present invention is not limited to this and can be applied to general electroacoustic conversion
gains such as speakers. As described above, according to the electro-acoustic transducer of the
present invention, it is possible to obtain a device having uniform frequency characteristics both
in secular change and in OSE production.
4. Brief Description of the Drawings FIG. 1 is a sectional view showing an example of a
conventional electroacoustic transducer, and FIG. 2 is a sectional view showing an embodiment
of the electroacoustic transducer according to the present invention. 1.11 Φ frame body 2 see
urethane foam 3.4. IT, 18 · · · · electrode, 5, 16 · · · bipolymer vibrating membrane, 6, 15. ...,
Covered body, 11a = 15! · · · · · · · · · · · · · · · · · · · insulation ring. Patent applicant Nippon Telegraph
and Telephone Corporation 1 Figure 2 Figure 1 a6, Inventors other than the above 1) Haruna 1)
Broadening End Page: 3
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