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DESCRIPTION JPH03186100

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DESCRIPTION JPH03186100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric handset for use in a telephone set or an intercom handset. Prior Art (3) The
following describes a conventional piezoelectric receiver. FIG. 5 is a cross-sectional view showing
the structure of a conventional piezoelectric receiver. As shown in FIG. 5, the front and rear cases
3 and 4 of the piezoelectric vibration plate in which the piezoelectric ceramic plate 1 is bonded
to a metal substrate 2 are sandwiched by the front case 3 and the rear case 4. An acoustic
resistance material 5 is fixed to the rear case 4 to flatten the frequency characteristics. Further,
lead wires 6 are respectively connected to the metal substrate 2 and the piezoelectric ceramic
plate 1. 7 is a shock absorbing material. SUMMARY OF THE INVENTION However, in the abovedescribed conventional configuration, the sound pressure-frequency characteristic produces a
peak of high sound pressure at a frequency of 4 KHz or higher, so that the audibly highfrequency sound may be felt abnormally. I had it. SUMMARY OF THE INVENTION The present
invention solves the above-mentioned conventional problems, and an object of the present
invention is to provide a high-quality piezoelectric receiver with suppressed sound pressure
peaks in high frequencies. Means for Solving the Problems In order to achieve this object, the
piezoelectric receiver of the present invention is configured such that a metal substrate to be
bonded to a piezoelectric ceramic plate has a dome shape. Action By this configuration, pressure!
The high-order resonance of the diaphragm can be suppressed, the peak of the sound pressure in
the high region can be suppressed, and the sound quality can be improved. Embodiment An
embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a
cross-sectional view showing the structure of a piezoelectric receiver according to a first
embodiment of the present invention. In FIG. 1, reference numeral 8 denotes a dome-shaped
metal substrate having a diameter smaller than that of a second resonance node, and a discshaped piezoelectric ceramic plate 9 is bonded to the concave surface thereof to form a pressure
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it diaphragm. Do. The outer periphery of the piezoelectric diaphragm is sandwiched by the front
case 3 and the rear case 4 from the front and rear thereof, and the lead wires 6 are connected to
the dome-shaped metal substrate 8 and the piezoelectric ceramic plate 9 respectively. The same
elements as those of the conventional example described in FIG. 4 have the same reference
numerals and the description thereof will be omitted. FIG. 2 is a cross-sectional view showing the
structure of a piezoelectric receiver according to a second embodiment of the present invention.
In FIG. 2, a ring-shaped piezoelectric ceramic plate 10 is bonded to the convex side of the domeshaped metal substrate 8 to form a piezoelectric diaphragm. The same components as those of
the first embodiment described in FIG. 1 are denoted by the same reference numerals, and the
description thereof is omitted. FIG. 3 is a cross-sectional view showing the structure of a
piezoelectric receiver according to a third embodiment of the present invention. In FIG. 3, a discshaped piezoelectric ceramic plate 9 is bonded to the concave surface of the dome-shaped metal
substrate 8 to form a piezoelectric diaphragm, and in the recess of the dome-shaped metal
substrate 8 and the space of the piezoelectric ceramic plate 9. The elastic resin 11 is filled.
The same components as those of the first embodiment described in FIG. 1 are denoted by the
same reference numerals, and the description thereof is omitted. FIG. 4 is a diagram showing the
sound pressure-frequency characteristics of the piezoelectric handset in the third embodiment
together with that of the prior art. As described above, according to the present embodiment, the
peak of the sound pressure in the high region can be suppressed by making the metal substrate
constituting the piezoelectric diaphragm into a dome shape. As described above, the present
invention can realize an excellent piezoelectric receiver capable of suppressing high-order sound
pressure peaks by suppressing high-order resonance of a piezoelectric diaphragm by using a
dome-shaped metal substrate. It is a thing.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the configuration of a piezoelectric receiver according to
a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the
configuration of a piezoelectric receiver according to a second embodiment of the present
invention, and FIG. FIG. 4 is a cross-sectional view showing the configuration of a piezoelectric
receiver according to a third embodiment, FIG. 4 is a diagram showing sound pressure-frequency
characteristics of the piezoelectric receiver, and FIG. 5 is a cross-sectional view showing the
configuration of a conventional piezoelectric receiver.
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domed metal substrate, 9 и и и Piezoelectric ceramic plate, 10 и и и и и и Ring-shaped piezoelectric
ceramic plate, 11 и и и и и и и и и и elastic resin.
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