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JPS56103599

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DESCRIPTION JPS56103599
Description 1 Title of Invention
Composite speaker
3. Detailed Description of the Invention A speaker capable of efficiently reproducing voice, a
person of voice, and a speaker (or microphone) capable of detecting and reproducing an output
signal have been required. Speaking of the former, the sound signal has a center frequency of
1KH2 and if it is 1-3 octaves before and after, practically sufficient hearing feeling is obtained,
and if it is from 1 drive efficiency, the excitation of the diaphragm only in this band is It will be
good if it can be obtained. Regarding the latter, it is desirable to operate the device by voice input
(a small-sized microphone is required, but it is desirable to share a microphone and a speaker in
terms of space in portable devices etc.). The detection of sound pressure is small in a normal
speaker, so the solution to this is desirable. The present invention, which was made to solve the
request of the previous day at once, relates to the structure of the speaker, in particular to the
configuration of the vibration system. The invention will be described in the following on the
basis of the drawings. FIG. 1 shows a cross-sectional view of the main structure of the present
invention, and FIG. In FIG. 1, 1 is a composite speaker according to the present invention, 1 is a
stainless steel diaphragm such as stainless steel (hereinafter referred to as an image moving
plate), 2 is Pb (Zr, Tt) (J) 3 such as ZnOBaTiIJ3 Piezoelectric EndPage: 1 body A thin film of
substance (hereinafter referred to as a piezoelectric thin film) is formed on a vibrating plate by
ion plating, sputtering or the like, and an electrode substance 9 is formed on the surface thereof
by vapor deposition or the like. 3Id upper yoke, 4 lower yoke, 5 permanent magnet, 6 voice coil,
7 иии piezoelectric thin film terminal, 8 voice coil terminal voice coil 6 directly fixed to electrode
material 9 with adhesive The upper yoke 3 and the lower yoke 4 are connected with the magnet
5 interposed therebetween, and the lower yoke 4 receives the outer peripheral portion of the
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diaphragm. FIG. 2 shows an embodiment of the composite speaker of the present invention in
FIG. 1, wherein 12 is a frequency detector, 10 is a gain controller of an amplifier, and 11 is an
amplifier. When the speaker 1 vibrates, a voltage is detected by the piezoelectric thin film. For
example, at a frequency of 4 KHz or more, the gain is suppressed to suppress the excitation
power from flowing into the voice coil terminal 8. If this is done, the drive efficiency of the circuit
will be improved. When trying to operate the device by voice input, a small microphone with
high sensitivity is required, but in portable devices, it is desirable to share a speaker and a
microphone from the viewpoint of space efficiency. However, when a normal speaker is used,
detection sensitivity is low and sufficient functions can not often be performed when using it as a
microphone.
According to the present invention, a piezoelectric thin film, particularly, co-BaTiO 3 or the like
having a large piezoelectric constant pb (Zr, Tt) o 3 ░ is formed on the diaphragm, so that the
excitation of the sound due to air vibration is detected. It can be detected as a sensitivity voltage.
Voice input to this milled rice, small portable information equipment and educational equipment
becomes possible. This input signal can perform one of the devices, for example, start, stop,
change of stored contents, etc., in accordance with the internal signal processing system. On the
other hand, in the present invention or the composite speaker, since the voice coil is also fixed to
the diaphragm, the output information of the device can be voiced. As described above, according
to the present invention, it is possible to configure a full-blown microphone with one speaker. In
another embodiment, as shown in FIG. 2; as shown here, when the diaphragm 1 is vibrating by
the voice coil drive as a speaker, the vibration detection is performed on the piezoelectric thin
film 2 at the same time, Only the necessary band can be emphasized by feedback control.
Further, in some cases, the damping can be improved by shorting the both ends 7a-7b of the
detection terminal I. Further, according to the present invention, since the piezoelectric thin film
is provided from the central portion to the peripheral portion of the diaphragm, it is also effective
in suppressing the division vibration of the diaphragm. 7t, the diaphragm may be made of a
material other than metal, such as holialate resin, polypropylene, etc., and a piezoelectric thin
film may be formed on a metal plate prepared in advance, and this may be used by bonding to
the diaphragm. As described above, according to the present invention, practical effects are
remarkable because it can be realized with a simple structure, such as that a high sensitivity
microphone can be built up with one speaker, feedback control of the speaker is possible, and so
on.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of the main part of the
composite speaker according to the present invention, and FIG. 2 is an explanatory view of an
embodiment of the composite speaker according to the present invention. 1 и composite speaker
1 diaphragm 2 и и piezoelectric thin film 3 и upper yoke 4 и lower yoke 5 и и и permanent magnet 6
voice coil 7 detection terminal 8 и и voice coil terminal 9 electrode material 10 gain controller 11 и
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amplifier 12 и и и Detector Patent Assignee Shizun Watch Co., Ltd. Attorney Attorney Toshihiko
KanayamaEndPage: ?
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