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DESCRIPTION JPS63240300

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DESCRIPTION JPS63240300
[0001]
The present invention relates to a flat loudspeaker having a magnetic circuit without using a
magnet. PRIOR ART FIG. 2 is a cross-sectional view of a conventionally known dynamic speaker.
In the speaker 1, a conical diaphragm 3 is disposed in the frame 2. The peripheral portion of the
conical diaphragm 3 is supported by the frame 2 and the voice coil 4 is fixed to the top of the
horn. Reference numeral 5 denotes a damper, which connects the diaphragm 3 to the frame 2.
The voice coil 4 is disposed in a magnetic circuit composed of the magnet 6 and the yoke 7.
Therefore, the diaphragm 3 is driven by supplying a voice current to the voice coil 4. [Problems
to be Solved by the Invention] In the conventional dynamic speaker 1, as described above, the
conical diaphragm 3 is disposed in the frame 2 and the magnet 6 and the magnet 7 are
externally attached to the frame 2. Because of this, the overall shape, in particular the thickness,
has to be increased. In addition, since the magnet 6 is used to construct a magnetic circuit, not
only miniaturization is difficult but also the overall weight has to be considerably heavy.
Therefore, an object of the present invention is to provide an electrodynamic speaker which can
be made small, particularly thin and lightweight. [Means for Solving the Problems] The
loudspeaker according to the present invention is a flat loudspeaker using a diaphragm in which
a plurality of electrodes through which audio current flows are formed in parallel on at least one
surface. In addition to the vibrating membrane, a pair of frames arranged to hold an opening at
the center and hold the peripheral edge of the moving membrane, and outside the frame parallel
to the parallel electrodes on the vibrating membrane And a wound coil. The coil is provided to
generate a magnetic field around the electrode on the vibrating membrane through which the
audio current flows, and may not be connected to the electrode on the vibrating crotch. It may be
connected in series. When connected in series with the electrodes on the vibrating membrane, a
magnetic field is generated around the electrodes on the dynamic film by the audio current.
[Operation] In the speaker according to the present invention, the audio current is supplied to the
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plurality of electrodes on the vibrating crotch, while the magnetic field is generated around the
plurality of electrodes on the vibrating membrane by the coil wound around the outside of the
frame. That is, since the electrode through which the voice current formed on the vibrating
membrane flows is disposed in the DC magnetic field formed by the coil, the voice current is
flowed to the electrode on the vibrating membrane to drive the vibrating membrane to perform
electro-acoustic It is possible to do the conversion.
[Effects of the Invention] In the present invention, since the diaphragm is a diaphragm, and a
plurality of electrodes use a vibrating film formed in parallel on at least one main surface, the
magnetic circuit is a frame without using a magnet. Since it is comprised using the coil wound by
the outer side of this, the planar speaker which can make thickness of the whole extremely thin
can be obtained. Further, since no magnet is used to form the magnetic circuit, the weight □□□
can be dramatically reduced, and the structure of the magnetic circuit can be simplified.
Furthermore, since the parallel electrode is formed by vapor deposition or etching jig of metal,
the weight of the moving film can be extremely lightened. It also improves the mechanical
impedance match with air. Therefore, a high efficiency flat type speaker can be obtained, and
almost the entire surface of the diaphragm can be driven, so that the frequency characteristic is
also improved. In addition, since the planar speaker of this invention has a low impedance, it can
be used instead of the conventional dynamic speaker. Furthermore, since it can be composed of
only a moving film, a pair of frames and coils, automatic assembly is easy, and therefore mass
productivity is excellent. DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are a
perspective view and a perspective view, respectively, of a flat type speaker according to an
embodiment of the present invention, which is schematically disassembled and shown. Referring
to FIG. 1, in the loudspeaker of this embodiment, a plurality of electrodes 12a to 12o are formed
in parallel on one main surface of a vibrating film 11 made of, for example, synthetic resin or
rubber. The plurality of electrodes 12a to 12g are connected to each other by connection
electrodes 13.14 at both ends of the vibrating membrane 11. Thus, the electrodes 12a to 12g are
connected in parallel between both ends of the vibrating membrane 11. The electrodes 12a to
12o and the connection electrode 13 ° 14 can be formed by vapor deposition of CIJ or A (] or
the like, or by using an etching method. A similar parallel electrode may be formed on the other
main surface of the vibrating membrane 11. The connection electrode 13.14 of the vibrating
membrane 11 is drawn to the outside by a lead wire 15.16 shown schematically. The lead wires
15.16 are connected to flow the audio current to the electrodes 12a to 12g. On the other hand, a
pair of frames 21 and 22 is installed to hold the vibrating membrane 11. The frame 21 ° 22 has
an opening 21a, 22a at the center. Therefore, only the peripheral portion of the vibrating
membrane 11 is held.
This is because by vibrating the imaging film 11 over a wider area, it is possible to reproduce
even lower = 6-noise. Further, in the illustrated example, the frame 21. 22 is configured in a
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square frame shape and is configured to hold four sides of the vibrating film 11 in order to
vibrate the vibrating film 11 uniformly. However, in some cases, a frame that holds only two
sides of the vibrating membrane 11 may be used. The coil 31 is wound around the outer
periphery of the frame 21. 22 in a state where the imaging film 11 is held by the frame 21. 22
described above. Although not shown in FIG. 1, the coil 31 is wound continuously from one lead
portion 31a to the other lead portion 31b. That is, the coil 31 is wound multiple times in parallel
with the electrodes 12a to 121J on the vibrating membrane 11 and in a portion overlapping each
of the electrodes 12a to 120 (see FIG. 2), connected between the lead portions 31a and 31b Is
wound. In this embodiment, a direct current magnetic field can be generated around the winding
of the coil 31 by supplying a direct current between the lead portions 31a and 31b of the coil 31
described above. If audio current is supplied to the electrodes 12a to 12g on the moving film 11
described above in this state, the diaphragm 11 can be driven as in the case of the conventional
electrodynamic speaker shown in FIG. This will be described with reference to FIG. FIG. 4 is a
schematic cross-sectional view of a state in which the electrode 12a is cut in the short direction
as viewed from the longitudinal direction of the electrode 12a. Now, in the configuration of FIG. 1
and FIG. 2] As shown by symbol A in the drawing, a direct current flows in the paper insertion →
paper back direction above electrode 12a and is shown by symbol B below electrode 12a.
Assuming that the paper flows from the back to the rough coat direction and the voice current
flows from the paper into the paper back direction in the electrode 12a, the direction of the
magnetic field is as shown by an arrow 1. Therefore, the vibrating membrane 11 moves in the
arrow M direction. In this way, the electro-acoustic conversion is performed in the same manner
as the conventional electrodynamic speaker. The above-described coil 31 and the electrodes 12a
to 12g formed on the vibrating film 11 may be connected in series. For example, by connecting
the lead wire 16 to the lead portion 31a of the coil 31, both can be connected in series. In this
case, by passing an audio current, a direct current magnetic field is generated around the coil 31
by the audio current, so that a self-repulsion type electrodynamic speaker can be configured.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view schematically showing a structure of an embodiment of
the present invention, FIG. 2 is a cross-sectional view showing an example of a conventional
dynamic speaker, and FIG. 3 is an embodiment of FIG. FIG. 4 is a schematic cross-sectional view
for explaining the principle of electro-acoustic conversion in the embodiment of FIG.
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In the figure, 11 indicates a vibrating membrane, 12a to 12g indicate electrodes formed on a
vibrating crotch, 21.22 indicates a frame, and 31 indicates a coil. Japanese Patent Application
Laid-Open No. UG 3-240300 (4) · · · · · 2
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