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JPS63158999

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DESCRIPTION JPS63158999
[0001]
BACKGROUND OF THE INVENTION The present invention relates to a stereo system using a
piezoelectric film speaker, and more particularly to adding separated stereo signals to
piezoelectric vibrators on both sides attached to both sides of a film diaphragm. The present
invention relates to a piezoelectric film speaker stereo system in which the effect of a stereo
system can be obtained with one speaker. 2. Description of the Related Art In general, a speaker
is a device for converting an electrical signal into an audio signal, and in particular, a dynamic
type loudspeaker is one, a voice coil provided in a magnetic circuit moves up and down
according to the applied electrical signal. The vibration of the diaphragm connected in series
makes it possible to reproduce the audio signal, and such a structure provides excellent
reproduction characteristics with a relatively simple configuration, and has a high conversion
efficiency. On the other hand, such a dynamic type speaker has a very heavy magnetic circuit and
a large shape because of the wide width of the reproduction band (Band). It has the disadvantage
of being affected by the sound quality. On the other hand, recently, development of a
piezoelectric solution speaker has been advanced using a piezoelectric element that can mutually
convert electrical energy and mechanical energy. Especially, a film speaker using a large number
of piezoelectric elements is a conventional buzzer. Or a mere high-sounding speaker, the range of
use of a specific piezoelectric solution speaker is greatly expanded, and it has been used as a
substitute for a dynamic speaker. 0 Such a piezoelectric film speaker is compared to a
conventional dynamic speaker Its weight is very light, its price is low, its height is not very small,
and uniform sound quality can be obtained regardless of the influence of humidity and
temperature, especially dome shape, arch shape, square shape, cylindrical shape etc. It has the
advantage that it can be used in various shapes and it can be used for decoration such as
desktops and desktops. On the other hand, in order to enjoy a three-dimensional sound that is
full of liveliness, the speaker system must be stereophonic, and a general stereo system using a
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conventional dynamic speaker has an input signal as shown in FIG. , A stereo separator 2 for
separating the input signal, an amplifier 3, 3 'for amplifying the separated signal, and a speaker
4.4' for reproducing an audio signal according to the amplified signal, The signals separated from
the stereo separator 2 into the left and right audio signals are amplified by the respective
amplifiers 3.3 'and sounded by the respective speakers 4.4'. However, such stereo systems must
transmit the separated left and right audio signals to their respective speakers and drive at least
two speakers 4.4 '. In order to satisfy good listening conditions, it takes time and effort, such as
adjusting the pointing direction of both speakers according to the listening distance of the
listener, and it is not a idiot that handling is inconvenient, its installation cost is bulky And other
problems.
[Means for Solving the Problems] Therefore, according to the present invention, to solve the
above-mentioned conventional problems, the separated stereo signals are respectively added to
the two side vibration elements of the piezoelectric film speaker. It is a thing. [Function] Not only
can you enjoy the stereo effect sufficiently by using one piezoelectric film speaker, but also when
the film diaphragm is formed in an arch shape, the left and right audio signals are heard
uniformly regardless of the position of the listener It can. DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT A stereo system of a piezoelectric film speaker according to the
present invention will hereinafter be described in detail with reference to the following drawings.
FIG. 2 is a block circuit diagram of an embodiment of the present invention, and FIG. 3 is a crosssectional view of a speaker. The stereo system has an input 11 for receiving an input signal, a
stereo separator 12 for separating the signal applied to the input 11 into left and right audio
signals, and amplifiers 13 and 13 'for amplifying the separated signals, respectively. And a
piezoelectric speaker 14 that receives an amplified signal and reproduces an audio signal, and
this piezoelectric speaker 14 has a large number of piezoelectric vibrating elements 15 arranged
side by side on both sides of a film diaphragm 160, and a piezoelectric vibrator 15. Are
respectively connected to the amplifiers 13 and 13 'and have the following structure: 0 Note that
L1 and L2 are lead wires 0 When a stereo modulated input signal is applied to the input end 11
in such a configuration , The stereo separator 12 receives it, demodulates and separates it into
left and right stereo signals, and the separated signals are amplified by the respective amplifiers
13 and 13 '. After that, the signal of the left amplifier 13 is applied to the left piezoelectric
element 15 of the piezoelectric speaker 14 through the lead wire L1, and the signal of the right
amplifier 13 'is applied to the right piezoelectric element 15 through the lead wire L2, and the
respective audio signals At this time, it is preferable that the piezoelectric film speaker is formed
of a quadrangular arch shape of the diaphragm 1B and utilizes a hole speaker. In FIG. 3, nine
piezoelectric vibrating elements 15 arranged in a line are attached to both sides of the
diaphragm 16 of the film, and the diaphragm 16 vibrates according to the applied signal. The left
audio signal separated from the left amplifier 13 is applied to the element 15 through the lead
L1, and the right audio signal separated from the right amplifier 13 'is applied to the
piezoelectric vibrating element 15 on the right through the lead L2. Thus, one diaphragm 16 can
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be driven by both signals. According to the experimental results, when one vibration plate 16 is
driven by the piezoelectric vibrating elements 15 on both sides driven by different signals as
described above, the phenomenon that the respective signals are interfered almost occurs.
Rather, due to the characteristics of the arched diaphragm 16, it was possible to listen to stereo
sound with excellent directional characteristics.
The directivity characteristic of this speaker generated sound has an even radiation angle over a
wide range as shown by the arrow in FIG. Thus, in the stereo system of the present invention
811, the left audio signal is applied to the piezoelectric vibrating element 15 arranged on the left
side of the piezoelectric speaker 14, the right audio signal is applied to the next piezoelectric
vibrating element 15 arranged on the right, Since a single film diaphragm 16 is driven in
accordance with each audio signal, a stereo effect can be obtained using one speaker. [Advantage
of the Invention] As described above, according to the stereo system of the piezoelectric film
speaker according to the present invention, it can be applied to the piezoelectric film speaker of
various shapes at a low price and of course, the stereo sound can be heard by a single speaker.
As a result, it is possible to obtain uniform directional characteristics over a wide radiation angle
without the need for a separate sound adjustment depending on the position of the listener, and
enjoy excellent stereo sound regardless of the listening position. Effects such as
[0002]
Brief description of the drawings
[0003]
FIG. 81 is a structural diagram of a conventional stereo system, FIG. 2 is a structural diagram of
one embodiment of the stereo system of the present invention, and FIG. 3 is a cross-sectional
view of a piezoelectric film speaker.
11 · · · input end, 12 · · · fist · stereo separator, 13.13 · · · · · · · · · · · · · · · · · · Piezoelectric speaker,
15 self · addiction · piezoelectric vibrating element Diaphragm, LX, L2,.
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