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JPS57113600

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS57113600
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
piezoelectric buzzer, FIG. 2 is a cross-sectional view of a first embodiment of the present
invention, FIG. 3 is a plan view of the magnetic diaphragm of FIG. FIGS. 4 to 6 are sectional views
of second to fourth embodiments of the present invention, respectively. 2A: elastic diaphragm,
2B: piezoelectric magnetic plate, 4: case, 8: case bottom plate, 9: vibrator holding member, 10,
IOA, IOB, IOC: cylindrical Permanent magnet, 11 ... convex streaks.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic transducer such as a piezoelectric buzzer using a bimorph (composite) piezoelectric
vibrator in which a ceramic plate is fixed to a magnetic vibration plate. In general, 1, □, for
electro-acoustic transducers, in particular piezoelectric buzzers. 1−11ろ6°。 In the case of
the bimorph piezoelectric vibrator, a cylindrical support supports a portion of a node of vibration
of the bimorph piezoelectric vibrator and a peripheral edge of the vibrator. FIG. 1 shows a
conventional such piezoelectric buzzer. In this figure, the piezoelectric buzzer comprises a discshaped elastic diaphragm 2A, a disc-shaped piezoelectric ceramic plate 2B bonded to the disc, a
cylindrical support 3 and a case 4 having a sound release hole 6. ing. The elastic vibration 1i2A
is adhered to the tip end surface of the tubular support 3 by filling the U-shaped or V-shaped
adhesive groove 5 formed on the tip end of the cylindrical support 3 with an adhesive. In such a
conventional example, the number of working steps is increased to use the adhesive, and the
drying waiting time of the adhesive is required at the time of assembly, so that the production
efficiency is difficult to increase. In addition, since the bimorph piezoelectric vibrator is adhered
to the support, there is a drawback that it is difficult to adjust the support strength and adjust the
frequency characteristics, sound pressure, timbre and the like. In the present invention, the
magnetic diaphragm is crimped and supported on a cylindrical support by using the attraction
force of a magnet, and the conventional defect described above is eliminated and improved from
the 2-1 v (SJ co. . 2 is a sectional view of the first embodiment of the present invention, and FIG.
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3 is a bottom view of the magnetic diaphragm. In FIG. 2, the same reference numerals as in FIG. 1
denote the same or equivalent parts. 8 is a case bottom plate, 9 is a vibrator holding member
made of a cylindrical nonmagnetic material, 10 is a cylindrical permanent magnet (for example,
ferrite magnet ring) disposed on the outer periphery of the holding member 9, 11 is a magnetic
diaphragm 2 Is provided on the lower surface of the case, and is a ridge for preventing its
positional deviation. In addition, as shown by the dotted line, the substrate 7 on which the
electronic component is mounted can be stored in the inner space of the holding member 9. In
this embodiment, the magnetic diaphragm 2A is absorbed downward by the cylindrical
permanent magnet 10, and the diaphragm 2A is crimped and supported by the holding member
9 by this suction force. FIG. 4 is a cross-sectional view of a second embodiment of the present
invention. In the figure, the same reference numerals as in FIG. 2 denote the same or equivalent
parts, 9A denotes a cylindrical permanent magnet formed of a plastic magnet or the like, and in
this example, 3-1J + S] also functions as a holding member. doing. That is, the magnetic imaging
plate 2 is attracted by the cylindrical permanent magnet 9A and held by itself.
FIG. 5 is a sectional view of a third embodiment of the present invention. In the figure, the same
reference numerals as in FIG. 2 denote the same or equivalent parts, and 4A is a cylindrical
holding member formed to hang downward (inwardly) from the periphery of the sound output
hole 60 of the case 4 And IOB are cylindrical permanent magnets disposed on the outer
periphery of the holding member 4A. In the first embodiment, the magnetic diaphragm 2A is
attracted by the cylindrical permanent magnet 10B and is crimped and supported by the lower
end edge of the holding member 4A. FIG. 6 is a cross-sectional view of a fourth embodiment of
the present invention. In the figure, the same reference numerals as in FIG. 5 are assigned to the
same or equivalent parts, 4B is a cylindrical support protrusion provided on the inner wall of the
case 4 and IOC is provided below the cylindrical support protrusion 4B. It is a cylindrical
permanent magnet. In this embodiment, the magnetic diaphragm 2A is attracted by the
cylindrical permanent magnet 10C, and is crimped and supported on the upper surface of the
support protrusion 4B. 4-10t3: As in the respective embodiments of J1 and above, in the present
invention, it is not necessary to bond the magnetic diaphragm, so the number of T types at
assembly decreases, and it is necessary to wait for the adhesive drying time. (Therefore, the time
and time required for assembly can be reduced, and mass production can be facilitated. Further,
by adjusting the suction force of the magnet, it becomes easy to adjust frequency characteristics
such as a buzzer, sound pressure, timbre and the like. Furthermore, if the cylindrical permanent
magnet is formed of a plastic magnet, it has the advantage of facilitating the molding process. In
the embodiment of FIGS. 2 and 5, the cylindrical magnet may be disposed inside the holding
member, and in each of the embodiments, the permanent five stones are cylindrical, rod-like or
plate-like. It is obvious that magnets and the like may be arranged in a cylindrical shape, and
magnets of such configuration and arrangement also fall within the scope of cylindrical
permanent magnets as referred to in the present invention. Although the present invention has
been described above as applied to a piezoelectric buzzer, it will be apparent that the present
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invention can also be applied to other electric sound 11f converters. 5−K)t4. No
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