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JPS5173023

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DESCRIPTION JPS5173023
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the main part of the present
invention, and FIGS. 2 and 3 are side views of the main parts of another modification. 1, 11A,
11B, 21A, 21B иииии Piezoelectric element, d pole, 3A, 14 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и Support body. -47- Japanese Utility Model Application Publication No.
51-73023 (2)-48-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a piezoelectric transducer, and particularly in a very small microphone such as a hearing aid
microphone, the desired sensitivity can be obtained and the disturbance of the pyro effect due to
temperature change is eliminated. It is a thing. In this device, a piezoelectric element formed in a
rectangular parallelepiped has one connecting port with one end coupled to the other end, and
the other end coupled portion of D as a force acting point to give the piezoelectric element a
remote deformation operation and a desired corresponding to the piezoelectric constant g + s In
addition to obtaining the output (1), it is characterized in that the pyro effect is eliminated. The
invention will now be described with reference to the drawings. In FIG. 1, the piezoelectric
element 1 such as a magnetic pole formed in a rectangular parallelepiped is polarized in the
lateral direction, that is, in the arrow P direction, and the upper and lower surfaces are output
electrodes 2A, 2B. In this upper and lower surface, there are further two electrically
nonconductive connecting ports such as synthetic resin materials. One end of the diode 3A, 3B is
adhesively bonded, and the connecting rod extends to one side of the piezoelectric element 1 to
couple the other end to form a force application point 4. The above assembly. The lower side of
the piezoelectric element 1 is bonded and fixed to an appropriate fixed support 5. 6A and 6B
denote output terminals connected to the electrodes 2A and 2B, respectively. In the converter
configured as described above, when the action of the imaging plate (not shown) is transmitted
to the force application point 4. Since the connection port and dot are displaced as shown by the
dotted line, and the piezoelectric element 1 is similarly deformed in the bending mode as shown
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by the dotted line, an output corresponding to the piezoelectric constant g + 5 is obtained
between the electrodes 2A and 2B. As this converter (2) has a high input impedance such as F'ET,
the temperature change that occurs when the output is applied to the device is eliminated. And,
since the connection port and the end portion appropriately extended out of the port are used as
the force application point, conversion efficiency is improved, desired high sensitivity is obtained,
and sufficient miniaturization can be realized. FIG. 2 shows another modification, in which two
piezoelectric elements 11A and IIB are adhesively bonded by holding the intermediate electrode
12 therebetween. What provided electrodes 13A and 13B on the upper and lower surfaces. The
connection rods 14 are coupled, and polarizations P, P in opposite directions are applied to both
of the piezoelectric elements 11A and IIB, and the output ends are connected in parallel. . The
output by can be obtained. FIG. 3 shows still another modification, in which two piezoelectric
elements 21A and 21B having electrodes respectively provided on the lower surface thereof are
coupled by holding a metal support 22 in the middle. Even if the connection port and the
connection port 24 are connected to the mounting end 23A of the support 22 on the support 23,
the same output by the turning moat is obtained.
The connection port in each of the above-mentioned embodiments and A should appropriately
select a material through which the force is transmitted without loss. As one example, a glass
epoxy board having a thickness of about 0.1 mm may be mentioned. As an example of the
prototype of the present inventor, as shown in FIG. 2, the dimensions of a combination of two
piezoelectric elements are 0.3 x 10 x 0.5 x 0.4 mm wide, with a width of 0, 3 mm D connection
port The lower limit of the capacitance value was 20 pF when the total length was made 2.5 mm
by bonding the do and the performance was sufficiently obtained. Incidentally, the piezoelectric
constant g + 5 in the lead zirconate titanate ceramic piezoelectric element is as large as 15 times
gs3 and g3 + 031 times as large as gs3, and sufficiently high sensitivity can be obtained as
compared with the conventional one by gs3 or g3 +. As mentioned above, this device has high
sensitivity. Eliminate the damage caused by the pyro effect caused by temperature changes. It
can be easily configured in a small size and has a large practical effect.
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