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DESCRIPTION JPS55121800

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DESCRIPTION JPS55121800
Description 1, title of the invention
Piezoelectric acoustic transducer
3. Detailed description of the invention The present invention mainly relates to a piezoelectric
acoustic transducer such as a speaker or a microphone in the audio frequency range using a
piezoelectric bending vibrator formed by bonding a piezoelectric ceramic plate and a diaphragm
such as a metal plate, The present invention provides a piezoelectric acoustic transducer having a
simple structure and good frequency characteristics of sound pressure and reception sensitivity.
Some of the conventional piezoelectric acoustic transducers are used in alarms, etc., but as shown
in FIG. 1, the piezoelectric emitter disk 1 and the metal plate 2 are bonded to each other to form
a lead wire 6.61. Are fixed to the case 3 by means such as adhesion so that the supports 4 and
41 are positioned at the nodes at the resonance frequency. The frequency characteristic of the
sound pressure of this piezoelectric acoustic transducer is maximized at its resonant frequency as
shown in FIG. The sound pressure can be further increased by changing the size and shape of the
window 6 provided on the front surface of the piezoelectric vibrator, and further by adding a
resonator, but the frequency characteristic of the sound pressure is extremely poor. The band is
extremely narrow, and there is a drawback that it can not be put to practical use in the case
where a wide frequency band such as a telephone or an interphone is required. The present
invention seeks to provide a piezoelectric, acoustic transducer in which such drawbacks have
been eliminated, and an embodiment of the present invention is shown in FIGS. Hereinafter,
embodiments of the present invention will be described with reference to the drawings. A
piezoelectric vibrator in which the piezoelectric ceramic plate 7 is bonded to a diaphragm or a
metal plate such as a brass plate or an aluminum plate or an insulating plate or an insulating
plate having a metal foil such as a glass epoxy printed board or an epoxy paper printed board;
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EndPage: 1-As shown in the figure, it is adhered to a disc-like elastic body 11 made of an elastic
body such as rubber having a hole 15 and a tubular body so as to close one opening of the
tubular body 12 The lead wires 9.9 'are respectively connected to portions fixed to the electrode
12 by bonding or the like and electrically connected to the electrodes provided on both sides of
the piezoelectric ceramic plate, and further provided on the terminal plate It is connected to the
main unit terminals 10, 10 '. In this case, as shown in FIG. 3, the piezoelectric vibrator and the
disc-like elastic body 11 may be bonded to the upper side of the disc-like elastic body 11 as
shown in FIG. It may be down. Further, in FIG. 3, although the cylindrical body 12 and the
terminal plate 13 are separate ones, it is natural that they may be integrally formed and have the
cylindrical body 12. In FIG. 3, the terminal plate 13 is provided with the hole 14, which is
intended to partially improve the frequency characteristic of the sound pressure, and the position
of the hole is good even on the side surface of the cylindrical body 12, Also, the size is
appropriately selected.
Usually, the diameter of the piezoelectric ceramic plate 7 is smaller than the diameter of the
diaphragm 8 such as a metal plate, and the diameter of the diaphragm 8 is larger than the
diameter of the hole of the disc-like elastic body 11. In this case, the diameter of the hole of the
disc-like elastic body and the diameter of the diaphragm 8 affect the magnitude of the sound
pressure and the frequency characteristics of the sound pressure, and the piezoelectric vibrator
is The vibrator is damped and the sound pressure is reduced, but the frequency characteristics
are improved. Usually, these are selected in combination. Also, in order to improve the sound
pressure and the frequency characteristics of the sound pressure, as shown in FIG. 5, the disklike elastic body 11 with the hole portion eccentrically made, and also in FIG. The disc-like elastic
body 11 may be used to damp the vibration of the central portion of the disc. The effects of the
present invention will be explained by the frequency characteristics of sound pressure and
admittance, which are shown in FIG. FIG. 6 is a curve diagram showing the frequency
characteristic of the admittance of a piezoelectric vibrator in which a piezoelectric, a ceramic
plate 7 and a diaphragm 8 such as a metal plate, an insulating plate or an insulating plate having
metal foil are bonded. FIG. 6a is a curve showing the frequency characteristics of the sound
pressure of the piezoelectric acoustic transducer of the present invention. In FIG. 6A, A indicates
the case where the terminal plate 13 is not provided with the hole 14 and B indicates the case
where the hole 14 is provided. That is, by mounting the piezoelectric vibrator through the disclike elastic body 11 so as to close one port of the cylindrical body 12, the frequency
characteristic of the sound pressure is the lowest resonance frequency determined from the
admittance curve. The vibration is damped appropriately by appropriately selecting the diameter
of the diaphragm and the diameter of the hole portion 15 of the disc-like elastic body 11, and
providing a hole in the terminal plate. The frequency characteristic of sound pressure is further
improved by this, and has a wide frequency band. It has a diameter of 24?. Piezoelectric vibrator
in which a 0.1 ?m thick piezoelectric ceramic plate is adhered to a 35 ?m diameter, 0.1 ?m
thick brass plate, outer diameter 4-shoulder m body, outer diameter 46 fl, diameter of hole 30. .
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An example at the time of using the disk-shaped elastic body which consists of rubber | gum of
thickness 1 fight is shown. Also, although only the sound pressure has been described, the
receiving sensitivity as a microphone is the same. As described above, although the configuration
of the present invention is very simple, it has an excellent wide frequency band and is sufficiently
used as an acoustic transducer such as a speaker or a microphone in an audio frequency range
such as a telephone or an intercom It is possible.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view showing an example of a
conventional piezoelectric acoustic transducer, FIG. 2 a characteristic diagram showing frequency
characteristics of sound pressure of the conventional piezoelectric acoustic transducer, FIG. 4 is a
perspective view of a disk-like elastic body used in the present invention, and FIG. 5 is a disk-like
elastic body used in the present embodiment, in the present embodiment. 6 is a characteristic
view showing the admittance and sound pressure frequency characteristics of the piezoelectric
vibrator showing the effects of the present invention, and FIG. 7 is a cross-sectional view showing
another example of the present invention. It is. 7 ...... piezoelectric ceramic plate, 8 ...... diaphragm,
9.9 '...... leads, 10, 10' ...... external terminal, 11 ... ииииии Disk-like elastic body, 12 иииииии Tubular body,
13 ииииии Terminal plate, 14 ииииииииииииииии Name of agent Attorney Nakao et al. 1 person EndPage: 2 Fig.
1 Fig. 211 Fig. 6 ? Fig. 7 EndPage: ?
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