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Patent application May 16, 1972, title of the invention ■ Japanese Patent Application,
Publication No. 5Q-49920, Japanese Patent Application Publication No. 5Q, (1975) 1.20,
Japanese Patent Application No. 40, ■ Application date Nichinan Mo, 19Q), ff1. / Application
date Nichinan Mo, (19Q), ff1. / Request for examination (all 2 pages) Office internal reference
number o [] 1 classification / / 1J4tjlt, / ρ l θl 3 to 2 5S / 2 2 Il specification 1, invention title 1,
invention title piezoelectric type converter
Address Tokyo Kokubunji 3-Chome Tomotocho 20-41 Rion stock company? -Inside residence
Tokyo Kokubunji, Kokubunji, 3-20-4, Tomotocho, catalog of attached documents [Fa] Japan
Patent Office published patent bulletin
3. Detailed Description of the Invention The present invention relates to the improvement of a
piezoelectric transducer using a piezoelectric material such as lead zirconate titanate ceramic. It
significantly increases the voltage generated with respect to the driving force, and is particularly
effective as an acousto-electric converter such as a microphone. An object of the present
invention is characterized in that polarization is applied in the same direction in the longitudinal
direction of a bimorph-shaped second-plate annual porcelain element, and bending strain along
the longitudinal direction is given to the same. A piezoelectric transducer is provided. An
embodiment of the following two drawings will be described. In FIG. 1, an intermediate plate 1
such as a synthetic resin having a small dielectric constant is held to bond an annual
piezoelectric element piece Electrodes 3 and 31 are provided on the front and back,
and electrodes 4 and 41 are provided on the end face at the other end. In order to polarize the
bimorph-shaped converter as described above, as shown by arrows P and P ', the electrodes 34.3'-4' share the same = -direction between each other. Apply pressure. In use, the electrodes 4
and 41 are short-circuited, the electrode 3 31 side is clamped by an appropriate support 5, and
the diaphragm 6 is suitably connected to the other end. When the diaphragm 6 vibrates in the
direction of the arrow, a bending strain in the longitudinal direction occurs in the piezoelectric
element, and an output is generated between the respective outer electrodes of the electric wires
wi3, 3 '. Take it out. The piezoelectric transducer having the structure described in-can
significantly increase the ratio of the output voltage to the set m1 force as compared with the
conventional one. In addition, electrostatic answer) t becomes small. EndPage: 1 Internal
impedance with the drawback of becoming a dog. It can be fully compensated by the input circuit
technology with elements such as field effect l-Lanster. 2 is equivalent to the arrangement of two
pieces of FIG. 1 in parallel, and the annual piezoelectric element 12.12 'is held by joining the
intermediate plate 11 and joined to each end face. Electrolytic 'l fi, 13.14.13', 14 ', provided with
an intermediate electrode 15.15' on the front and back of each of the intermediate part, and
arrows 1), p, and i) between the intermediate electrode and the end face electrode , 1. As shown
by p21, the left and right direction is reversed in the same direction, and polarization is applied
in the same direction. When used, each end electrode 13.13 'and 14.14' is short-circuited and 9
both ends are appropriately supported by the support 16.16 '. Then, the intermediate portion is
driven in the direction indicated by the arrow B to impart a bending strain in the longitudinal
direction to the transducer so that an output can be obtained between the outer intermediate
electrodes. Although the embodiment shown in FIG. 2 is, in other words, a configuration in which
two series transducers are connected in parallel, the configuration in which the number is further
increased is also effectively used for the same reason. it can.
It can be used for various applications as a sensitive converter, and has great industrial benefits.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of an essential part of one
embodiment of the present invention, and FIG. ], II: middle plate, 2.2 ', 12.12': piezoelectric
element piece, 3.3 ', 4.4', 13.13 ', 14.14', 15.15 ': electrode, 6: Diaphragm, 16.16 ": support.
Patent Applicant Rion Ltd. EndPage: 2
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jps504992, description
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