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JPS5950699

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DESCRIPTION JPS5950699
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker which generates a current in a voice coil by an optical signal to drive a
diaphragm. [Technical background of the invention and its problems] Recently, techniques for
transmitting optical signals using an optical fiber or the like have been developed. In the case of
audio equipment as well, transmission of signals by an optical afliver is considered among
components such as a player, a decker, a chain amplifier, etc. However, it is desirable that the
speakers be also driven directly by optical signals. However, the signal supplied to the
conventional speaker is limited to the electric signal, and the speaker can not be directly driven
by the light signal if it is as it is. SUMMARY OF THE INVENTION The present invention has been
made in view of the foregoing, and it is an object of the present invention to provide an
electrodynamic speaker which can be directly driven by an optical signal. SUMMARY OF THE
INVENTION In the present invention, in an electrodynamic speaker, an element having a
photovoltaic effect is formed on a voice coil, and a current is generated in the voice coil by an
optical signal, and the current button is used as a diaphragm. To drive. BRIEF DESCRIPTION OF
THE DRAWINGS FIG. 1 is a longitudinal sectional view of a speaker according to an embodiment
of the present invention, and FIG. 2 is a cross-sectional view of the drive portion of the speaker
according to an embodiment of the present invention. It is a front view. In the figure, 1 is a pole
piece, 2 is a top plate, 4 is a voice coil bobbin, 5 is a voice coil (conductor), 11.11 'is an element
having a photovoltaic effect, and 12 and 12' are for optical signal introduction. Slits 13 and 13
'are optical signals for driving, respectively. Here, the voice coil 5 forms a closed loop for each
turn, on which, for example, the elements 11 and 11 'having the photovoltaic effect of the silicon
system alternate positions, for example, 1800 for each turn. , Arranged repeatedly. The voice coil
5 on the voice coil bobbin 4 is formed, for example, by an etching method, and is formed by
forming elements 11 or 11 'having a photovoltaic effect in each loop. Optical signals 13 and 13
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'are supplied to the photovoltaic effect elements 11 and 11' of the voice coil 5 configured as
described above through the optical signal introduction Surin 12 and 12 ', respectively, and
optical signals are supplied to each loop of the voice coil Generates an electric current
corresponding to the magnetic field and drives the vibration system by the interaction between
the electric current and the DC magnetic field of the magnetic circuit. The optical signals 13 and
13 'for driving in this manner are as shown in FIG. In FIG. 3, (a) is an example of an electrical
signal, but this signal is divided into positive and negative parts, respectively, to produce the
signals of (b) and (C). Construct the signals 13, 13 '.
In FIG. 2, magnetic lines of force are formed from the pole piece 1 toward the top plate 2.
Therefore, when the optical signal 13 corresponding to (b) is supplied to the insulator 11 having
the photovoltaic effect, a current in the clockwise direction is generated, and a driving force in
the positive direction is generated, and (C) When the corresponding optical signal 13 'is supplied
to the element 11' having the photovoltaic effect, a current in the counterclockwise direction is
generated, and a driving force in the negative direction is generated. Thus, by driving the
vibration system using the light signals 13 and 13 'corresponding to the electric signal, it is
possible to reproduce an acoustic signal corresponding to the signal. FIG. 4 is an enlarged view of
the drive portion of the speaker of FIG. 1, but the optical signal 12 is supplied in the range of the
thickness of the top plate 2 having the largest magnetic flux density in order to effectively utilize
the magnetic field. [Effects of the Invention] With such a configuration, it is possible to directly
drive the speaker by the light signal. In this case, the input and output are electrically separated,
and the signal transmission process is unidirectional: “input electrical signal” → “optical
signal” → “output electrical signal” → “acoustic output” Therefore, there is almost no
reverse transfer, and it is not necessary to consider harmful interaction with the amplifier
system. Still, by keeping the winding width of the voice coil slightly larger than the required
maximum i amplitude, the optical signal 12, 12 'which supplies the range of the thickness of the
top plate 2 having the largest magnetic flux density Is used to generate driving force by
operating the photovoltaic effect elements 11 and 11 'which are always in the range of the
thickness of the top plate 2, so that constant driving force can be realized efficiently, and low
distortion characteristics Is possible. [Other Embodiments of the Invention] In the above
embodiment, the photovoltaic effect elements 11 and 11 'are alternately arranged on the voice
coil bobbin 4 on the opposite sides alternately for every one loop of disc 1 However, they may be
alternately arranged every two loops or every three loops as needed.
[0002]
Brief description of the drawings
[0003]
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2
FIG. 1 is a longitudinal sectional view showing an embodiment of the loudspeaker according to
the present invention, FIG. 2 is a transverse sectional view of a drive portion of the loudspeaker,
FIG. 3 is a signal waveform diagram for driving the loudspeaker, and FIG. It is a principal part
enlarged view of FIG.
1 ... pole piece, 2 ... top plate, 3 ... magnet, 4 ... voice coil bobbin, 5 ... voice coil, 6 ... damper, 7 ...
diaphragm, 8 ... Cap 9 9. Edge 10 10 Frame 11.11 1 Photovoltaic effect element 12 12 12 Slit for
introducing an optical signal 13 13 ′ Optical signal. Figure 2 Figure 8 Figure 4
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