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JPS56108698

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DESCRIPTION JPS56108698
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of the piezoelectric speaker according to the present invention, FIG. 2 is an enlarged crosssectional view of the main part, and FIGS. 3 and 4 are other embodiments. It is an expanded
sectional view of an important section of the 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · 6, 7 · · · · · · · · Piezoelectric ceramic plate, 8 · · · · · · · · · · · · · · · · · recessed
portion.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
speaker comprising a piezoelectric vibrator and a cone-shaped diaphragm coupled thereto, and
in particular, an improvement in the piezoelectric vibrator and resonator to improve the coupling
strength with the diaphragm. It is intended to improve the position and position so that the
central axes of the scanning plate and the piezoelectric vibrator coincide with each other, and try
to obtain an excellent in quality-quality 1. A conventional piezoelectric speaker is a cone. An
adhesive is bonded to the center of the disc-like piezoelectric vibrator with the top of the center
of the disc-like diaphragm folded back, but sufficient-bond strength can not be obtained, and the
central axis 1 of the disc, ((, Q′12 does not coincide with the central axis of the piezoelectric
vibrator, the vibration of the piezoelectric vibrator is not correctly transmitted to the diaphragm,
and there is a disadvantage that the characteristic surface becomes unstable. In addition, the top
of the diaphragm is cut horizontally to provide a flat part, and this flat part is attached to the
upper surface of the piezoelectric vibrator, or a hole is provided at the center of the piezoelectric
vibrator, and the top of the diaphragm is fitted into this hole. Although those that bond
adhesively together are also developed, it is difficult to make the centers of the diaphragm and
the piezoelectric vibrator coincide with each other (although it is possible to improve ri adhesive
strength, sufficient results can be obtained in terms of characteristics. There was a drawback that
it did not happen. The present invention eliminates the prior art defects as follows. Hereinafter, a
practical example of the present invention will be described with reference to FIGS. Reference
11-05-2019
1
numeral 1 denotes a frame formed by synthetic four-component resin, and the peripheral portion
of the frame 1 has an Id cone-shaped diaphragm 20 around and an edge portion connected
stepwise. The central portion of the piezoelectric vibrator 3 is coupled to the central top portion
of the diaphragm 2. 3 As the piezoelectric vibrator 3, as shown in FIG. 2, piezoelectric ceramic
plates 6, 7 having a through hole 5 at the center are attached to the upper and lower surfaces of
the common electrode plate 4, respectively. An electrode plate 8 is provided on the other surface,
and a conical recess 9 is formed at the center of the common electrode plate 4 of brass or the
like, and the top of the diaphragm 2 is inserted into the recess 9. Positioning and adhesive
bonding. The piezoelectric vibrator 3 of the above embodiment is called a bimorph, but it may be
a monomorph type as shown in FIG. That is, an electrode plate 8 having a through hole at the
center is provided on the upper surface of the piezoelectric ceramic plate 6 having a through
hole 5 at the center, and an electrode plate 4 having a conical recess 9 at the center on the lower
surface It is also good. Further, as shown in FIG. 4, a bimorph-type circular recess 10 may be
provided at the center of the common electrode plate 4 and the top of the diaphragm 2 may be in
the form of a circular ridge that overlaps with the circular recess 7.
Thus, since the piezoelectric speaker of the present invention is constructed, the coupling
strength between the diaphragm and the piezoelectric vibrator is increased by the increase of the
coupling area, and the top of the diaphragm is the four parts of the electrode plate. Positioning of
the positioning diaphragm and the If 屯 vibrator can be performed to make the central axes of
the rain sound coincide with each other, and the vibration of the piezoelectric vibrator can be
transmitted to the diaphragm in a stable state.・ It has the benefit of becoming a big thing of
practical value.
11-05-2019
2
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