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JPS57117897

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DESCRIPTION JPS57117897
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2 and FIG. 3 respectively show an
embodiment of a piezoelectric type sounding body according to the present invention-a sectional
view-4 is a headphone incorporating the sounding body according to the present invention FIG. 1
· · · · · · · · · · · · · · · · · · · · · · · Piezoelectric ceramic plate, 3 ° 5.6 · · · · · · · · · · · · · · · · ·
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
type sounding body, such as a headphone, a telephone receiver, etc., configured to receive sound
in a state of being brought close to the ear gear and used for a single speaker. 1, 2 and 3
respectively show cross-sectional views of a piezoelectric type sounding body according to the
present invention. In FIG. 1, reference numeral 1 denotes a circular diaphragm made of brass
plate, epoxy resin thin plate or the like, and a circular piezoelectric ceramic plate 2 having a
diameter smaller than that of the diaphragm 1 is concentrically bonded to one side of the
diaphragm 1 ing. Electrodes are formed on both sides of the piezoelectric ceramic plate 2 and
lead wires are soldered to one of the outer electrodes and the metallic feature (1) 1088 // 7F ′
′ / ′ moving plate 1 connected to the other electrode. When the moving plate l is insulating,
the other electrode is folded back one side or a conductive film is formed on the surface of the
vibrating plate 1 and lead wires are connected thereon. The composite of the diaphragm 1 and
the piezoelectric ceramic plate 2 is picked up in a bending vibration mode when a signal is
applied to the piezoelectric ceramic plate 2 through the lead wire. 3 has a sound absorbing
function 1. In order to have a sound absorbing function to a certain extent, it is made of
expanded polystyrene, rubber or the like, and its shape is the same diameter as the diaphragm 1
and thick (Lf: disk shaped) There is. In this vibrating body 3, the piezoelectric dragon rubber
plate 2 of the vibrating plate 1 is adhered and is adhered to the surface opposite to the T2 side.
When such a sounding body 4 is incorporated into a headphone, as shown in FIG. 4, the
peripheral portion of the vibrating body 3 is adhered and fixed to the annular portion 7a in the
horn case. 8 is a band and 9 is an exposed image. In the present embodiment, when a signal such
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1
as music is applied to the piezoelectric ceramic plate 2, the complex consisting of the diaphragm
l and the piezoelectric ceramic plate 2 is bent and vibrated, and this vibration passes through the
entire other surface of the diaphragm 1 (2) 089 is transmitted to the vibrating body 3 and a
sound is generated. At this time, the diaphragm 1? : The composite of the IE electro-ceramic plate
2 has a resonance peak specific to the piezoelectric effect, but is softened by the vibration body 3
(7) sound absorption function, and the bass regeneration area also extends well. -Since a
sufficient sound pressure can be obtained due to the inherent properties of the piezoelectric
ceramic plate 2, the blade high-pitched sound reproduction area can realize a flat sound
pressure-frequency characteristic over a wide sound band. When the sound generator 4 is
incorporated into the horn case, it is possible to attach the sound generator 4 roughly by
mechanical means, so that the mass producibility of the headphone can be improved and the
price can be lowered. FIG. 2 shows another embodiment, and the difference from the
embodiment of FIG. 1 lies in the configuration of the vibrating body 5.
The vibrating body 5 is provided with a plurality of through holes 5a and 5b, and by this
configuration, the high-pitched sound reproduction area is further extended. FIG. 3 shows still
another embodiment, and the difference from the embodiment of FIG. 1 is the shape of the
vibrating member 6 and the vibration of the vibration member 6 ("ch 'IO" "") "'" "° An annular
groove 6C is provided on the side of the disc 6a inside the annular portion 6b which protrudes to
the peripheral portion of the bowl 1 and the one saucer bowl. The outer diameter is adjusted to
the inner diameter of the groove (3) 101) υ6C, and the t-diaphragm 1 is attached and attached
to the groove 6C because the annular portion 6b is pushed and expanded. In the present
invention, a piezoelectric ceramic plate is bonded to a vibrating plate, the piezoelectric ceramic
plate of the vibrating plate is bonded, and a vibrating body having a sound absorbing function is
spread over almost the entire surface opposite to the one side. Since it is attached, it is possible
to obtain a sufficient sound pressure level as a speaker and speaker sound generator with a
simple configuration, and to obtain flat frequency characteristics over a wide range of voice
band. Furthermore, it can be easily incorporated in the horn case 2 of a headphone or the like
with high mass productivity.
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