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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
piezoelectric vibrator in which a piezoelectric body is installed in a case where a metal plate is
supported by an elastic body in a cylinder, and FIG. The same sectional view of the piezoelectric
vibrator of the same conventional example in which the piezoelectric body is installed in the
cylindrical case provided. Fig. 3 is a piezoelectric oscillator according to the present invention in
which the piezoelectric body is installed in the case where the thin metal plate is provided in the
cylinder. FIG. 4 is a cross-sectional view showing another embodiment of a piezoelectric vibrator
according to the present invention in which a piezoelectric body is installed via a metal plate in a
case in which a thin metal plate is provided on a cylinder. is there. 7 ииииии Metal cylinder, 8 ииииииииии
Metal thin plate, 9 иии иии Piezoelectric body, 10 иииииии Metal plate.
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a piezoelectric
vibrator having a small resonance impedance. Conventionally, when manufacturing a
piezoelectric vibrator having a small resonance impedance by bonding a piezoelectric body to the
bottom of a cylindrical case having a bottom, as shown in FIG. 1, a metal bottom plate 2 with a
piezoelectric body 1 bonded and a cylinder A case in which a piezoelectric vibrator is configured
with rubber like between the parts 40 or via a resilient member 3 or a bellows-like elastic
support 5 is provided on part of the cylindrical part 6 as shown in FIG. X12. The piezoelectric
body 1 is adhered to the bottom of the (i) to form a pressure- / re / (non 22 electrophotographic
moving element). These elastically support the bottom of the case to which the piezoelectric body
1 is bonded by the elastic body 3 and the bellows-like elastic support portion 5, thereby
preventing an increase in resonance impedance. In the present invention, as shown in FIG. 3, a
thin metal plate 8 is bonded to one end opening of a metal cylinder 7 and a piezoelectric body 9
is bonded to the central portion of the thin metal plate 8. When there is a problem of strength, as
shown in FIG. 4, the metal plate 8 is bonded between the metal plate 8 and the piezoelectric
member 9 via a metal plate 1o thicker than the metal plate 8 to increase the strength and apply
external force to the piezoelectric member 9 It is configured to prevent the breakage of the
piezoelectric body 9 when a force is applied. In the structure according to the present invention,
since the metal thin plate 8 elastically supports the vibration of the piezoelectric body 9, the
increase of the resonance impedance can be prevented. According to the present invention, it is
easy to manufacture without using a complicated structure as shown in FIG. 1 of the prior art,
and FIG. The cost is low because there is no bellows-like elastic supporting portion as in the
above, and furthermore, it is possible to prevent the accumulation of dirt and water in the four
parts because there is no unevenness as in the prior art.
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