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JPS5711896

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DESCRIPTION JPS5711896
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views showing an
example of the construction of a conventional piezoelectric type electric sound-converter, and
FIGS. 3 and 4 are each an embodiment of the present invention. It is sectional drawing which
shows. Reference symbols 1 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 и и
и и и и и adhesion layer, 5.5 '-и и и Clamp ring, 6 иии и и и и и и и и и и и и и и и и и и и и и
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
piezoelectric electroacoustic transducer using a ceramic piezoelectric element. FIG. 1 shows an
example of the configuration of a conventional piezoelectric electroacoustic transducer. In the
figure, 1 is a metal plate, 2 is a piezoelectric ceramic plate bonded to the metal plate 1, 3 is a
frame, and 4 is an adhesive layer. In such a configuration, the metal plate 1 is fixed to the frame
3 by the adhesive layer 4, and nonuniformity such as the thickness and adhesive strength of the
adhesive layer 4 causes a deviation in the fundamental resonance frequency of vibration and
sensitivity. was there. In addition, the electric 1 и 8 ql from the metal plate 1 to the outside. In the
case of taking out the 1-on terminal, there is a disadvantage that it is necessary to use a
conductive adhesive or a separate lead wire. FIG. 2 is a cross-sectional view showing another
configuration example of a conventional piezoelectric electroacoustic transducer. In the figure, 1,
2 and 3 are the same as in FIG. 1, and 5.5 'is a clamp ring. In such a configuration, since the
metal plate 1 is made firmer than the metal plate 1 and fixed using the lamp ring 5.5 ', for
example, the clamp rings s and s' have a small contact portion with the metal plate 1 Due to the
distortion, the planarity of the metal plate 1 and the piezoelectric ceramic plate 2 is inhibited,
and the fundamental resonance frequency f. Increase in sensitivity, decrease in sensitivity, and a
slight difference in clamp pressure of clamp ring 5.5 ', etc., resulting in changes in lamp diameter,
fo, and sensitivity changes. Therefore, there is a disadvantage that a slight deviation of the size of
the clamp ring 5.5 ', such as K, causes a large deviation in sensitivity. This device is sailed to
eliminate the disadvantages of the prior art as described above, so the object of this device is to
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check the non-uniformity of the adhesive layer or the contact condition between the clamp ring
and the 2-? metal plate. It is an object of the present invention to provide a piezoelectric
electroacoustic transducer which does not cause a large difference in fundamental resonance
frequency and sensitivity due to slight deterioration of the sensor, and which is easy to take out
an electric terminal outside. The main point of the configuration of this invention is that in the
piezoelectric electroacoustic transducer, an annular recess or step is provided along the inside of
the fixed portion of the metal plate constituting the piezoelectric diaphragm. The drawings will
be described in detail below. FIG. 3 is a sectional view showing an embodiment of the present
invention, wherein 1 is a metal plate, 2 is a piezoelectric ceramic plate, 3 is a frame, 5 and 5 'are
clamp rings, and 6 is a gold plate 1 Four parts. By providing an annular recess 6 in the periphery
of the metal plate 10, the apparent stiffness of the recess 6 is reduced, and the portion inside the
recess s6 and the portion outside the four portions 6 are equivalently separated K Become.
Therefore, when the frame: l is fixed using clamp ring 5.5 'on the outer side of recess 6, the
influence on the vibration inside of four parts 6 is small even if there is a deviation in the
dimensions of clamp ring 5' 5 ', Collinear frequency, 3- to sensitivity ,! Deviation can be reduced.
Further, by providing the four portions 6, conditions close to peripheral support (the
displacement and bending moment are zero at the peripheral portion) can be realized, and
without increasing the outer diameters of the metal plate 1 and the piezoelectric ceramic plate 2,
or The resonant frequency can be reduced without reducing the thickness of the plate 1 and the
piezoelectric ceramic plate 2. Furthermore, by using metal for one or both of the clamp printers
5 and 5 ', the electric terminal can be easily taken out from the metal plate. FIG. 4 is a sectional
view showing another embodiment of the present invention, in which a step 7 is provided on the
periphery of the metal plate 10. As shown in FIG. The effect of the step 7 is the same as the effect
of the fourth part 6. In the embodiment shown in FIGS. 3 and 4, if the peripheral portion of the
metal plate 10 is fixed using a rigid member equal to or more than the metal plate, the fixing is
performed using an elastic member such as rubber. In addition to the above, structural reliability
is enhanced, and the electrode can be easily removed. -4 = As described above, according to the
present invention, the deviation of the fixed portion is an internal vibration by providing an
annular recess or step along the inside of the fixed portion of the metal plate constituting the
piezoelectric diaphragm. Because the influence on the sensor can be reduced, the deviation of the
resonance frequency and sensitivity can be reduced even if the manufacturing tolerance of the
clamp ring is relaxed. In addition, since the conditions for supporting the periphery can be
realized, the resonance frequency can be lowered. Further, the electrical terminals can be easily
taken out of the metal plate to the outside.
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