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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are cross-sectional views of the
conventional piezoelectric sounding body in the case of peripheral support and nodal support,
and FIG. 2 is a graph showing sound pressure-frequency characteristics of the conventional
piezoelectric sounding body. FIG. 3 shows an example, FIG. 3 is a sectional view showing an
embodiment of the piezoelectric sounding body according to the present invention, and FIG. 4 is
a sectional view showing another embodiment of the present invention. FIG. 5 is a view showing
an example of the sound pressure-frequency characteristic of the piezoelectric speaker according
to the present invention. 5.6 · · · · · · · · · Piezoelectric porcelain plate, 7, 8 · · · · · · · · · · · · · · · · · · · · · ·
· · · · Case.
[Detailed description of the invention] The present invention has a monomorph structure in
which a piezoelectric ceramic plate and a metallic thin plate having a metal root are laminated,
and a hymorph structure in which a piezoelectric diaphragm and a pressure magnet are
temporarily laminated. It is an object of the present invention to provide a piezoelectric sound
generator 1862r + v * which has a structure that generates sound by using a sound pressurefrequency special diaphragm of this piezoelectric sounding body as a vibration source. The
conventional piezoelectric sounding body has a structure in which one piezoelectric diaphragm is
held by the case 3 as shown by the curved surface of this structure in FIG. 1, and FIG. 1 supports
the periphery of the diaphragm The structure shown in FIG. 1 is a structure for supporting the
vibration fIIIs of the diaphragm. In the figure, 1 is a piezoelectric ceramic plate, 2 is a metal plate
which is bonded to the piezoelectric ceramic plate 1 to form a piezoelectric transmission plate,
and 4 is a signal voltage applied to the electrodes (not shown) of the piezoelectric ceramic plate 1
Lead wire. The piezoelectric body is characterized by very low power consumption, light color
and light weight, and has been used in many devices in recent years as a booster for generating
single-frequency sound. However, this conventional piezoelectric issuer has a resonance plate
which is very sharp in the case of a vibration plate. As shown in FIG. 2, it is very high around the
resonance frequency equation, and the level change due to the I @ wave number is extremely
large. Therefore, when using this sounding body as melody-) as a single force, only the sound
with a specific number of gate enemies is emphasized, so it is a major drawback in reproducing
natural sound 1873. It had become. The present invention eliminates such a conventional defect
and flattens the peripheral liquid number characteristic of sound ratio to provide a one-tone
sounding body capable of reproducing natural melody and voice. The king according to the
present invention [11, the sounding body is in one case multiple pressure of pressure 'pregnancy 11! The most important feature of the present invention is to attach & !, which will be
described below with reference to FIG. In FIG. 3, 6 and 6 are piezoelectric ceramic plates.
Numerals 7 and 8 are metal plates laminated with the piezoelectric ceramic plate 5.6,
respectively, and the first piezoelectric diaphragm is constituted by the piezoelectric ceramic & 6
and the metal plate 7, and the piezoelectric ceramic plate 6 and the metal plate 8 The two
piezoelectric vibrators & make up, cn et al. The two piezoelectric diaphragms are their size and
thickness. The number of resonance frequencies is set to be different from each other by C which
makes the material etc. different. The piezoelectric diaphragms 2 ') are respectively supported by
the peripheral support at an interval of F9T between the thickness directions of the case 9 and
the case 9 is provided with a through hole 11.12. And 10) are leads for simultaneously applying
a signal withstand voltage to the electrodes of the piezoelectric ceramic plate
The first and second piezoelectric diaphragms vibrate independently of each other due to the
signal-pressure applied by the first capacitor 10 in 1884 tables, and the resonance frequencies of
the first and second piezoelectric diaphragms are different. Can be formed by adding the sound
pressure '# property of the two piezoelectric diaphragms. That is, at low frequencies the sound
pressure by the first piezoelectric diaphragm compensates for the sound pressure by the second
piezoelectric diaphragm, and conversely at the frequencies at which the sound pressure by the
second piezoelectric diaphragm is low the first piezoelectric diaphragm It can compensate for the
sound pressure. FIG. 4d shows another embodiment of the piezoelectric sounding body of brown,
in which two piezoelectric diaphragms are supported on the case 9 at the vibration nodes
respectively. In FIG. 4, the same parts as in FIG. 3 are indicated by the same numbers. In the
above-described FIGS. 3 and 4, the piezoelectric diaphragm is exemplified by a monomorph
forgery in which a piezoelectric ceramic plate and a metal plate are bonded together, but the
present invention is equivalent to a bimorph structure in which piezoelectric ceramic plates are
mutually bonded. It goes without saying that the effects of In addition, it is possible to use an
elastic thin plate such as another film-shaped diaphragm instead of the gold foil temporarily.
Furthermore, the number of piezoelectric diaphragms does not have to be two, and a large
number of piezoelectric diaphragms with slightly different resonance frequencies may be used,
and the level change due to the frequency of sound pressure can be made smaller as the number
of piezoelectric diaphragms deviates. . When two piezoelectric diaphragms are used, the first
resonance frequency at which the sound pressure of the first piezoelectric diaphragm decreases
and the first resonance frequency of the second piezoelectric diaphragm in the middle of the
second resonance frequency 畝 Q It is most effective to set An example of the sound pressurefrequency characteristic in this case is shown in FIG. The piezoelectric brother according to the
present invention can be compared to the conventional piezoelectric N sound by compensating
for the sound pressure with each other because of the use of a small number of piezoelectric
vibrations @ different in co-image frequency as in the characteristic of FIG. Can you significantly
reduce the level change due to sound pressure l @ l [ff, melody or sound? If you want to play
faithfully will be able to play, it is very useful and practical.
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