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DESCRIPTION JPS5824299

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DESCRIPTION JPS5824299
[0001]
The present invention relates to a novel flat-plate piezoelectric speaker, and more particularly to
a pressure IEW speaker capable of emphasizing the reproducibility of the high range.
Hereinafter, 9 /! Of the present invention. An embodiment will be described in detail with
reference to the drawings. In FIG. 1, reference numeral l denotes a piezoelectric sounding body,
for example, in which a piezoelectric ceramic plate 3 which is similarly circular but has an outer
diameter smaller than that of the diaphragm 2 is concentrically attached to the circular metal
diaphragm 2 . Electrodes (not shown) are formed on both sides of the piezoelectric ceramic plate
3, and lead wires (not shown) are connected to one electrode and the metal diaphragm 2
electrically connected to the other electrode. There is. The piezoelectric sounding body l is fixed
to the annular frame 4 at its periphery as the piezoelectric vibrating body in the present
invention. At the center of this piezoelectric sounding body 1, for example, a disk-like object 5
having substantially the same diameter as the piezoelectric ceramic plate 3 and having rigidity
and light weight and made of expanded polystyrene or the like is attached with an adhesive or
the like It is done. In the present embodiment, when a signal is applied to the lead wire, the
piezoelectric sounding body 1 is bent and vibrated in a state of being supported on the outer
periphery, and an audible sound is generated. At this time, it is experimental that the sound on
the low frequency side of the audible frequency range is transmitted mainly through vibration
and motion near the outer periphery of the piezoelectric sounding body l, and the sound on the
high frequency side is mainly transmitted through vibration in the middle of the piezoelectric
sounding body l As shown in this example, when a rigid light object 5 is placed at the center of
the piezoelectric sounding body 1 as in this embodiment, the sound on the high frequency side
resonates with the object 5 to the outside. It is transmitted and high frequency characteristics are
often extracted. Therefore, a piezoelectric speaker emphasizing the reproducibility of the high
range is obtained. FIG. 12 shows a second embodiment, which differs from the above
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embodiment in that the peripheral portion of the piezoelectric sounding body 1 is attached to the
frame 7 via the annular elastic member 6. In the present embodiment, when the piezoelectric
sounding body 1 vibrates in a bending vibration monitor, the sound around the low sound side is
often extracted because the periphery of the piezoelectric sounding body 1 is supported by the
elastic body 6. Therefore, when configured as in this embodiment, a piezoelectric speaker having
a characteristic in which high frequency characteristics and low frequency characteristics are
simultaneously enhanced can be obtained. FIG. 3 shows a third embodiment, in which tension is
applied to one side of the annular frame 7 (in which the vibrating membrane 8 is attached, this
vibration 1 !! A piezoelectric sounding body 1 similar to that in the embodiment of FIG. 1.2 is
attached to the upper portion 8 and the piezoelectric vibrating body is constituted by the
vibrating film 8 and the piezoelectric sounding body 1. According to the 0 embodiment in which
the rigid and light object 5 is attached to the central portion of the vibration Ws 8, the
reproducibility of the high range is improved in addition to the frequency characteristic peculiar
to the piezoelectric speaker with the vibrating membrane 8 .
FIG. 4 shows a fourth embodiment, which differs from the embodiment shown in FIG. 1 in that a
bottom wall 9a is provided on the annular frame 9, and this bottom wall 9! A protrusion 9b is
provided at the central portion of I. The tip of the protrusion 9b is fixed to the central portion of
the piezoelectric sounding body 1 with an adhesive so that the vibration of the central portion of
the piezoelectric sounding body 1 is stationary. is there. According to the present embodiment,
when the central portion of the peripherally supported piezoelectric sounding body 1 is
supported and the vibration of that portion is stopped, the resonance beak peculiar to the
piezoelectric effect is suppressed, and flat frequency characteristics are obtained. At the same
time, the placement of the object 5 improves the reproducibility of the high-pitched sound. In
particular, when the repeatability of the high tone range is reduced due to the central support of
the piezoelectric sounding body 1, the effect of providing the object 5 may be very large. FIG. 5
shows the cost of the fifth embodiment, which differs from the embodiment shown in FIG. 2 in
that a bottom wall 10J is provided on the annular frame 10, and a protrusion is formed at the
center of the bottom wall 10a. 10b is provided, and the tip of the protrusion 10b is fixed to the
central portion of the piezoelectric sounding body 1 with an adhesive so that the vibration of the
central portion of the piezoelectric sounding body 1 is stopped. Oh. By supporting the central
portion of the piezoelectric sounding body 1 supported at the periphery in Fig. 6 and 16 and
stopping the vibration of that portion, the resonance peak specific to the piezoelectric effect is
suppressed and a flat frequency characteristic is obtained at the same time The placement of the
object 5 and the presence of the elastic body 6 -Vm improve the reproducibility of the sound in
the high and low range, and obtain flat frequency characteristics over a wide audio frequency
range. FIG. 6 shows a sixth embodiment, which differs from the embodiment shown in FIG. 1153
in that a bottom wall portion 11M is provided on the annular frame 11, and a projection 11b is
provided at the central portion of the bottom wall portion 111. The tip of the protrusion 11b is
fixed to the central portion of the piezoelectric sounding body 1 with an adhesive, and the
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vibration of the central portion of the piezoelectric vibrator is configured to stand still and is
generated here and the obtained effect is The third embodiment is substantially the same as the
combination of the embodiments shown in FIGS. In each of the above-described embodiments,
seven bonded bodies of the metal diaphragm 2 and the piezoelectric ceramic plate 3 are used as
the piezoelectric sounding body l, but in the present invention, a bonded ceramic body of a resin
diaphragm and a piezoelectric ceramic plate, a piezoelectric ceramic plate The two sheets may be
bonded to each other or one having a piezoelectric thin film formed on a vibrating plate may be
ground. In each of the above-described embodiments, changing the shape and size of the object 5
changes the frequency position of the reproduced sound in the high frequency range. For
example, when it is formed in an annular shape, the reproducibility of a slightly lower frequency
is improved. You can use it to fine tune the frequency response.
Furthermore, in each of the above-described embodiments, although the foam sting has rigidity
such as single ring and the light object 5 is provided on the diaphragm 2, the piezoelectric
ceramic plate 3 is provided on the outside of the diaphragm 2 The object 5 may be provided on
the piezoelectric ceramic plate 3, but rather the effect of high-pitched sound enhancement
becomes larger if configured in this way. According to the present invention, as described above,
the rigid and light object is placed on the central portion of the piezoelectric vibrator which is
supported in the periphery and vibrates in the flexural vibration mode, so that it is in the audio
frequency range. Reproducibility of the high range can be easily enhanced.
[0002]
Brief description of the drawings
[0003]
1, 2, 3 and 11!
FIGS. 4, 5 and 6 are all sectional views showing an embodiment of the piezoelectric speaker
according to the present invention. Figure 1 Figure 2 j j (4-E! ; (J calendar tm
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