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DESCRIPTION JPS626599

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DESCRIPTION JPS626599
[0001]
Industrial Applicability The present invention is a composite type piezoelectric buzzer diaphragm
used for a piezoelectric sounding body or a piezoelectric speaker that generates a sound by a
piezoelectric buzzer diaphragm in which a piezoelectric element thin plate is bonded to a
conductive elastic thin plate such as a metal plate. It is about PRIOR ART As shown in FIG. 4, a
piezoelectric buzzer diaphragm used in a conventional piezoelectric sounding body or
piezoelectric speaker has a piezoelectric element 2 connected to a conductive elastic thin plate 1
such as brass, aluminum, phosphor blue electricity, steel plate or the like. It has a bonded
structure with an agent. When sound is generated using this piezoelectric buzzer perturbation
plate, since the sound generation efficiency drops sharply below the fundamental resonance
frequency of the piezoelectric buzzer diaphragm, the sound generation area is broadened and the
voice and melody etc. are reproduced faithfully with good sound quality. In order to be possible,
the fundamental resonance frequency needs to be lowered to 300 H 2 or less. Therefore, it is
necessary to make the piezoelectric buzzer diaphragm as thin as possible and to increase the
diameter. Recently, it is possible to mass-produce piezoelectric elements with a thickness of 60 to
100 ?m and a diameter of 40 ? ? gI, and bonding to an Oshi diameter 60 QTIII + a metal plate
of 100 ?m or less in thickness realizes a fundamental resonance frequency of 3 oo Hz or less
from K It is possible. FIG. 5 shows an example of sound pressure frequency characteristics of a
piezoelectric sounding body using this piezoelectric buzzer diaphragm. Problems to be Solved by
the Invention However, although it has become possible to sufficiently lower the fundamental
resonance frequency in the piezoelectric speaker and the piezoelectric speaker using this
piezoelectric buzzer diaphragm, the level change of the sound pressure depending on the
frequency is shown in FIG. As shown in FIG. 2, the fidelity is insufficient when reproducing
speech or melody. An object of the present invention is to provide a composite type piezoelectric
buzzer diaphragm which can solve the conventional problems. Means for Solving the Problems In
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order to solve the problems, the present invention uses a plurality of piezoelectric buzzer
diaphragms of different diameters, and a second smaller diameter on the first diaphragm of
larger diameter. The outer peripheral portion of the diaphragm is fixed, and a hole is made in a
portion overlapping with the second diaphragm of the first diaphragm. Operation With this
structure, the first piezoelectric buzzer diaphragm and the second piezoelectric buzzer
diaphragm can be configured to interpolate sound pressure frequency characteristics with each
other. 1 and 2 are front views showing a composite type piezoelectric buzzer diaphragm
according to an embodiment of the present invention. In FIG. 1, 3 is a first metal plate having a
large diameter. The first piezoelectric element 4 is bonded to the first metal plate 3 and these
constitute a first piezoelectric buzzer diaphragm.
The second metal plate 6 is a second metal plate for fixing the periphery thereof to the first metal
plate 3. The second piezoelectric element 6 is bonded to the second metal plate 6, and these
constitute a second piezoelectric buzzer diaphragm. Further, the first piezoelectric buzzer
diaphragm 4 is provided with a hole 7 in the vicinity of a central portion overlapping the second
piezoelectric buzzer diaphragm. Further, 8 is a lead wire connected to the first and second metal
plates 3 and 5, 9 and 1o are lead wires connected to the first piezoelectric element 4 and the
second piezoelectric element 6, respectively. Here, the diameter and thickness of the first metal
plate 3 and the piezoelectric element 4 are substantially determined by the lower limit frequency
of the sound range to be generated. The diameter (fixed diameter) and thickness of the second
metal plate 6, the diameter and thickness of the second piezoelectric element 6 apply a signal
between the lead wires 8 and 9, and only the first piezoelectric buzzer diaphragm is The
fundamental resonance when only the second piezoelectric buzzer diaphragm is driven by
applying a signal between the lead wires 8.10 in the middle of the fundamental resonance
frequency (first resonance frequency) and the second resonance frequency when driving.
Determine the frequency to be located. The size and shape of the hole 6 formed in the first metal
plate 3 are determined so that the first and second piezoelectric buzzer diaphragms are mutually
acoustically controlled so that the change due to the frequency of the sound pressure becomes as
small as possible. Further, as a method of fixing the second piezoelectric buzzer diaphragm to the
first piezoelectric buzzer diaphragm, the inner side from the outer peripheral portion may be
adhered in a ring shape by an elastic adhesive 11 such as silicone rubber as shown in FIG. . In
FIG. 2, the same parts as in FIG. 1 are indicated by the same symbols. FIG. 3 is a sound pressure
characteristic diagram of the composite piezoelectric buzzer diaphragm obtained by the present
embodiment shown in FIGS. 1 and 2. FIG. Thus, according to the present embodiment, it is
possible to reduce the change in sound pressure level. Although these examples show an example
using two piezoelectric buzzer diaphragms, it goes without saying that three or more
piezoelectric buzzer diaphragms may be configured in the same manner. Although three lead
wires are shown, normally, lead wires 9.10 are connected to drive the first and second
piezoelectric buzzer diaphragms in parallel. However, depending on the circuit, between the lead
wires 8.9 and between the lead wires 8 and 10 may be separately driven. The composite type
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piezoelectric buzzer diaphragm of the present invention integrates and utilizes the resonance
characteristics of a plurality of piezoelectric buzzer diaphragms, and significantly reduces the
change in sound pressure level due to frequency, thereby making it possible to combine melody,
voice and the like. This is to improve the sound quality of a piezoelectric speaker and a
piezoelectric speaker that generate sound. In addition, the thin feature of the piezoelectric
sounding body is not lost and this is a very useful invention.
[0002]
Brief description of the drawings
[0003]
1 and 2 are front views showing a composite type piezoelectric buzzer diaphragm according to
an embodiment of the present invention, FIG. 3 is a sound pressure frequency characteristic
diagram of the composite type piezoelectric buzzer diaphragm of the present invention, and FIG.
FIG. 5 is a perspective view showing a conventional piezoelectric buzzer diaphragm, and FIG. 5 is
a diagram showing an example of sound pressure frequency characteristics of the conventional
piezoelectric buzzer diaphragm.
3 иии First metal plate, 4 и и и First piezoelectric element, 6 и и и Second metal plate, 6 и и и Second
piezoelectric Elements 7,..., Holes, 8, 9, 10. Name of agent Attorney Nakao Toshio and 1 other
person Figure 2 N4 wave role (H2)
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