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DESCRIPTION JPS5764997

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DESCRIPTION JPS5764997
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional piezoelectric
ceramic diaphragm, FIG. 2 is a plan view of an intermediate plate in FIG. 1, FIG. 3 is a sectional
view of an embodiment of the present invention, FIGS. 4 and 5 are plan views of the plate which
is being retracted, and FIG. 5 is a view showing the frequency characteristics of the piezoelectric
and electromagnetic vibrator diaphragms of the prior art and the present invention. 1.2 ...
Piezoelectric porcelain plate, 3A ... middle plate.
[Detailed description of the invention] In the present invention, the piezoelectric ceramic vibrator
is used as a piezoelectric speaker or a diaphragm of a piezoelectric speaker or a winter one which
can be used as a diaphragm of an electric sound generator. Pressure I suitable for It relates to a
magnetostrictor. An example of a conventional piezoelectric ceramic vibrator is shown in FIG. In
the figure, 1 and 2 piezoelectric ceramic plates, 3 is a middle plate sandwiched and bonded
between the prepressing electromagnetic a 'Fi 1.2. As shown in FIG. 2, it is formed of a flat plate
as shown in FIG. Although the illustration is omitted, electrodes W are respectively formed on the
piezoelectric ceramic plate 1.2. -1- = Q'77] Thus, in the piezoelectric ceramic vibrator, if the
thickness of middle #i 3 is reduced in order to improve the frequency response in the low
frequency range, the adhesive strength decreases and the use In the example, the adhesion
between the middle plate 3 and the piezoelectric ceramic plate 1.2 is easily exfoliated, etc. (by the
experiment of the inventor of the present invention, the diameter of 27 The frequency
characteristics of the piezoelectric ceramic vibrator formed by bonding and integrating a 60 μm
thick middle plate (beryllium, copper, etc.) with two iron plates, as shown by the dotted line in
FIG. In this case, when the sound pressure was about 100 dB at a distance of about lθm from the
sound source, ie, the piezoelectric ceramic imaging device, peeling of adhesion occurred. The
present invention improves the adhesive strength by removing a large number of through holes
in the middle plate, eliminates the above-mentioned drawbacks, and improves the frequency
response in the low frequency range. It is something to try. FIG. 3 is a cross-sectional view of an
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embodiment of the present invention, and FIG. 4 is a plan view of an intermediate plate used in
InI3. In the figure, 1.2 is a piezoelectric ceramic plate, 3A is a middle plate adhered and held
between the piezoelectric ceramic plates 1 and 2, and 4 is a small hole drilled in the middle plate
2 = 1. As well shown in FIG. 4, in the present embodiment, a large number of small holes 4 are
provided in the middle plate 3A. When bonding and integrating, the adhesive comes into direct
contact with both piezoelectric ceramic plates via the small holes 4. For this reason, the bonding
strength of the piezoelectric ceramic plate-middle-pressure-falling porcelain plate is significantly
improved. According to the present invention, the hole diameter of the small holes 4 to be drilled
in the middle plate 3A is preferably about 0.2 to 5 and the arrangement of the small holes 4 is #
11 of the middle plate 3A! It is preferable to cover the entire surface. According to the invention,
the pressure 30 m in diameter and 0.1 m thick is 1! j If two porcelain plates and an inner plate
(beryllium, copper, etc.) with a thickness of 10 to 60 inches are bonded together with an
adhesive, good frequency characteristics with good response in the low range can be obtained as
shown in Figure The
In addition, in the case of driving 件 where an output of Aoda 100 dB can be obtained at a
distance of about 101 from the sound source, that is, the piezoelectric ceramic vibrator, peeling
of the present and greetings did not occur at all. As described above, according to the present
invention, the thickness of the inner plate is reduced to improve the response of the piezoelectric
ceramic vibrator at a low frequency as well as bonding by pebbles formed by the inner plate.
Increase the number 112 and realize the increase in sound output 7).
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