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Showa + March 241 "Competitioner-Patent Office Director-House of the House, Name of
Invention 3, Patent Applicant: Tokyo Kokubunji, Kokubunji, 3-20-41, Higashimotocho, Rion Co.,
Ltd. Lion Corporation Telephone (0423) 22-11334, attached documents List of items fi +
statement @ 1 (2) Drawing 1 (3)-One draft request for examination (4) Request for a second copy
of the application form ■ Japan Patent Office ■ Japanese Patent Application Publication JP-A
49-1226860 Published Japanese Patent Application Publication No. (1974) 11.22-Japanese
Patent Application No. 4g-33g 2g-Application Kisho-,! ', (197, 3) 3.2. Application for examination
of examination data (all two pages) Specification 1, Title of invention 1, Title of invention
Piezoelectric transducer
2, departure J's address Tokyo Kokubunji City Tohocho 3-chome 20-41 Rion Co., Ltd.
3. Detailed Description of the Invention The invention is an acousto-electric transducer,
particularly a piezoelectric element such as lead zirconate titanate ceramic. The present invention
relates to an improvement of a piezoelectric transducer adapted to be required to be extremely
small, such as a hearing aid microphone. Although hearing aid microphones are required to be
smaller and smaller in size in the near future, nine proposals have been made to compensate for
the reduction in sensitivity due to miniaturization. According to the present invention, a bending
strain which is active 7 in a long direction is applied to a bimorph-like piezoelectric element in
which opposite polarizations are applied in the longitudinal direction of two pieces of 77 pieces.
By configuring it to In order to provide a small converter with high sensitivity and a high
sensitivity, an embodiment of the following drawings (in the following description, in FIG. 1, an
intermediate plate 1 such as a synthetic resin having a small dielectric constant may be held to
The piezoelectric element pieces 2 and 2 'are joined, and electrodes on the front and back of each
end portion are: A 3 'is provided, and the other end face 1 (electrodes 4, 4' are provided. The
polarization process is performed by applying polarization voltages reverse to each other
between the electrodes 3-4 and 3'-4 'as shown by arrows P and P'. . One end of the piezoelectric
element on which the electrodes 3 and 3 'are provided is clamped by a suitable support 5, and
the other end is coupled to the drive ring 6 and connected to the diaphragm 7. In the converter
having the above-mentioned configuration, when the diaphragm 7 vibrates in the direction A, the
free end of the piezoelectric element-is bent and vibrated, and a signal output is generated
between the electrodes 3.3 'and 4.4'. EndPage: Conventionally, it is well known that polarization
is applied in the thickness direction of a bimorph-like piezoelectric element and an output is
taken out by flexural vibration, but in comparison with such conventional ones The one is
extremely sensitive. For the same driving force, the intermediate plate is to increase the output
near the neutral surface, but the capacitance value decreases. In FIG. 2, electrodes 12.12 'and
13.13' are respectively provided on both end faces of a bimorph-like piezoelectric element
consisting of two sheets of coin-like piezoelectric element pieces 11 '. The 'P and l' are
polarized and supported at one end and clamped by the body 14. In the one that drives the free
end of the other end to make it bend and vibrate. An output is obtained between power supplies
4112.12 'and 13.13'. In this case, the central portion may be driven by clamping and supporting
both ends. FIG. 3 shows that in FIG. 2, the electrodes 20 are provided across the central part and
the electrodes 21 and 22 provided on both end surfaces of the electrodes 9 have opposite
polarizations P, P, 'and P2' P '. An output is obtained between the end face electrodes and the
center electrode 20 in the applied one.
As mentioned above, this invention is purchased 1 k! ? i’ijl’で。 One that can obtain
high sensitivity is "a profit of tl-.
4. Brief Description of the Drawings FIG. 1 is a sectional view of an essential part of one
embodiment of the present invention, and FIG. 2 and FIG. 3 are sectional views of a piezoelectric
element part of an embodiment of 1 #. 1: Intermediate plate, 2.2 ', 11.11': Piezoelectric element
piece. 5. 14: Support, 6: Drive Linda, 7: Vibrator. Patent Applicant Rion Ltd. EndPage: 2
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