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FIELD OF THE INVENTION The present invention relates to a piezoelectric handset for use in a
handset of a telephone or an interphone, and in particular, provides a device which can prevent
discharge due to static electricity charged on the human body and at the same time use the
handset for deaf persons. It is. 2. Description of the Related Art An electromagnetic type, an
electrodynamic type, and a piezoelectric type have been put to practical use as a sound generator
used for a telephone set and an interphone receiver. The electromagnetic type is operated by
winding a coil so as to increase or decrease the magnetic flux of the magnet by means of a
vibrating plate on which a magnetic body is fixed and a magnet, and a current flows. The
electrodynamic type forms a narrow gear knob where magnetic flux is concentrated by magnets
and magnetic materials, and by passing an electric current to the coil contained in the gap, a
force for displacing the coil acts to be bonded to the coil and the next diaphragm vibrates. . In the
case of the piezoelectric type, electrodes are provided on both sides of a ceramic thick plate
having piezoelectricity, and by applying a signal between them, the ceramic piezoelectric body
expands and contracts. By bonding the ceramic piezoelectric body to the metal plate, a deflection
deformation is generated as a whole to generate a sound. According to the operation principle,
the former two cause current to flow in the coil to generate magnetic flux, so a part of the
magnetic flux leaks to the outside though it is small. However, the latter does not generate any
magnetic flux since it utilizes the piezoelectricity of the material. In addition, many of these
handsets use a metal material as a case material, and the case is in direct contact with one of the
input terminals in some cases. In particular, in the case of the piezoelectric type, since the
imaging plate is made of metal, the case and the input terminal are electrically at the same
potential. FIG. 4 shows a cross-sectional view of a conventional piezoelectric receiver. The main
components of the conventional piezoelectric receiver consist of a front case 31, a vibrator in
which a ceramic piezoelectric body 34 and a diaphragm 33 are bonded, and a rear case 35. The
front case 31 is made of metal and provided with a sound hole 32. The vibrating plate 33 is a
thin metal plate and is bonded to the ceramic piezoelectric body 34, and is electrically connected
to the electrode on the bonding surface. An input terminal 38 is fixed to the rear case 35, and the
other input terminal 39 uses a bent portion of the front case 31. The rear case 35 is provided
with a leak hole 36 and an acoustic resistance member 3 which are important for the frequency
characteristics of the handset. Problems to be Solved by the Invention In such a conventional
configuration, since the piezoelectricity is used for sound generation, almost no magnetic field is
generated, and therefore no leakage flux is generated at all. Such a handset can not be used
because the deaf person uses the phone in a way to pick up the leakage flux. In addition, the
front case of the piezoelectric receiver is made of metal, and is in electrical contact with one of
the electrodes of the ceramic piezoelectric body through the diaphragm, and often used as one of
the input terminals, etc. It has the disadvantage of being prone to discharge.
When the phone is used in dry seasons and places, static electricity is accumulated in the human
body by friction such as chemical fibers, and when the person using the phone uses the phone,
the handset in the handset when the phone is used And spark discharge. In the case of a
telephone including an electronic circuit such as an IC, the semiconductor device may be broken
and become unusable due to the voltage current at the time of the discharge. The discharge also
makes the user uncomfortable. The present invention solves such a problem and generates
leakage magnetic flux so that a hearing-impaired person can use a telephone using a
piezoelectric receiver, and also, it can be used in dry seasons and places even when it is used
electrostatically. It is an object of the present invention to provide a handset which does not
cause discharge due to Means for Solving the Problem In order to solve the problem, the present
invention comprises a front case made of an electrical insulator, a partition plate made of an
electrical insulator, a coil, a vibrator and a rear case, and The installed / notted sound holes and
the sound holes provided in the partition plate are alternately arranged, and the coil is wound
around a front case or a coil bobbin provided in the partition plate. Operation With this
configuration, the conductor coupled to the input terminal of the handset can not be directly
viewed when viewed from the earpiece of Dodse Soto. That is, the discharge path in the case of
causing the discharge becomes long, the electrostatic withstand voltage becomes high, and the
discharge does not occur practically. In addition, a magnetic flux can be leaked by adding a coil
to the piezoelectric handset and energizing it. EXAMPLES Examples of the present invention will
be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the
structure of a coiled piezoelectric receiver according to the present embodiment. In FIG. 1, the
front case 1 has a sound hole 2 and a coil 6, and has a structure in which the partition plate 3,
the diaphragm 14, the ceramic piezoelectric body 13 and the rear case 8 are accommodated.
Sound holes 4 are provided in the partition plate 3 and are alternately arranged with the sound
holes 2 of the front case 1, and the diaphragm 14 can not be seen directly from the sound holes
2 of the front case 1. Both sound holes may be alternately arranged in the rotational direction.
The ceramic piezoelectric body 13 is bonded to the vibrating plate 14 to obtain electrical
conduction at the bonding surface. The rear case 8 is fixed to the input terminal 9.12i, and has a
leak hole 11 and an acoustic resistance material 10. In FIG. 1, the lead wire 6 from the coil 5 is
connected to all the grooves 7 of the side surface of the front case 1 and to the input terminal 9
° 12 respectively, but the input terminals are separately connected in series. It can also be done.
The input terminal 9 is connected to the vibrating plate 14, and the input terminal 12 is
connected to one electroabrasive of the ceramic piezoelectric body 13. The front case 1, the
partition plate 3 and the back case 8 are formed of an electrical insulator. For example, resins
such as polypropylene, polyethylene foam, polycarbonate and phenol can be used. FIG. 2 is a
cross-sectional view showing an example of attaching a coiled piezoelectric type handset
according to this embodiment to-. As shown in FIG. 2, by arranging the earpiece 16 of the
handset 16 alternately with the sound hole 2 of the front case 1, the electrostatic capacity can be
further increased. Also, if the coil is located on the front of the piezoelectric receiver 18 and the
pickup coil of the hearing aid is placed close to the earpiece 16 of the No-Ndse Soto 15, a large
magnetic flux can be obtained and sensitivity is high with little current It can be picked up.
Unnecessary sound pressure in the high region can be suppressed by utilizing the unevenness of
the front case 1 of the piezoelectric receiver 18 and using the space formed at the time of
attachment as the second chamber. In addition, by providing the ring-shaped projection 1T inside
the positioning part 16, the mounting can be facilitated. FIG. 3 shows a cross-sectional view of a
coiled piezoelectric type receiver according to another embodiment of the present invention. The
difference with respect to FIG. 1 is that the partition plate 22 is located in front of the front case
19 and the coil 23 is wound around the partition plate 22. The alternate arrangement of the
sound holes 20 and 21 and the materials of the front case 19, the partition plate 22 and the rear
case 24 are made of resin of the same type as in FIG. EFFECTS OF THE INVENTION As is
apparent from the above description, according to the present invention, a front case made of an
electrical insulator, a partition plate made of an electrical insulator, a coil, a vibrator and a rear
case, and a sound hole provided in the front case And the sound holes provided in the partition
plate are alternately arranged, and by winding the coil around the front case or the coil bobbin
provided in the partition plate, the amount of electrostatic Wd is excellent, practically practically
human body is charged Electrostatic discharge does not occur. By providing the coil for the front
case and the light, it is possible to realize a telephone which produces a large leakage flux and is
easy to use for the deaf.
Brief description of the drawings
Fig. 1 is a cross-sectional view showing a coiled piezoelectric type receiver according to an
embodiment of the present invention, and Fig. 2 is a cross-sectional view showing an example in
which the same coiled piezoelectric receiver is attached to Lundsenot, 1.19.31. · · · · · Front case,
3, 22 · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · sound hole 4, 21 · · · ...
sound holes.
Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 2
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