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JPS5328717

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DESCRIPTION JPS5328717
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the basic configuration of an
electrostatic type speaker device, and FIG. 2 is a configuration explanatory view showing one
embodiment of the speaker device of the present invention. 15 · · · · · · · · · Fixed electrode, 16 · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · metal coating , 21... Coil 22.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates in particular to an
improvement of the electrostatic loudspeaker system. Heretofore, a speaker device has been
implemented which makes use of the static electricity of the work / cret. As shown in the speaker
apparatus i # i, for example, tf, III, the metal diaphragm 13 is made to face in parallel with the
fixed electrode 12 to which the electret 11 is attached, and an audio signal is generated between
the fixed electrode 12 and the diaphragm 13 14, Na? -2a'7 / Ri is a book designed to be applied
over a few thousand. However, the above-mentioned conventional electrostatic type speaker
device may deteriorate in performance due to its size and the area of the diaphragm, etc. K), and
there is a disadvantage that the difference between the individual products of the driving power
4 is large. There is a need for uniform coldness qμ, and improvements that can be made before
sex improvement. The present invention has been made in view of the above circumstances, and
aims to provide a speaker device which can further improve the performance and easily achieve
uniform performance. Hereinafter, one embodiment of the present invention will be described in
detail with reference to FIG. I! Light up. That is, in FIG. 2, kin is a fixed electrode 16 with an
electret 16 attached to one surface. The fixed electrode 15 is provided with a large number of
through holes 11. Then, the imaging plate wedges are disposed facing each other with an
appropriate interval between the electrets 16111K. This vibrating plate is formed by vapor
deposition in which a coating @ 2 o and an insulating unit U are erected on an insulating base
material 19 such as a plastic film. The reserve for providing the coil U can be selected from
various positions f (center of diaphragm plate @ =) K if necessary, for example, in the case of this
embodiment, the imaging movement 141 FL! It is set near the outer circumference of. Then,
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corresponding to each wire portion a @ b He + d of the front r coil マ グ ネ ッ ト, the magnets A,
8. C and D are cast. Each of the magnets A, B, C, and [] is, for example, a flat plate, and one of the
four is paired F along the corresponding line portion & * h + 6 * d button, and adjacent poles are
different. Are arranged to That is, when the entire wire portion moves in the same direction with
respect to the magnet K, the disposition direction of each magnetic pole and the wire portion is
determined such that the current flows in the same direction in the entire coil. Also, Magne) A
'disposed outside the diaphragm. B ', C' and D'4 act in the same manner as the magnets A to D
ahead. In the speaker apparatus configured as described above, the output of the power amplifier
22 of the audio system is added to the terminal of the 1st electrode 15 and the terminal of the
vibration @III to operate as a sbee force.
In this case, the terminal of the coil U provided with the imaging wI plate IK is fed back to the
power distribution amplifier 22 via the amplifier 23 in a feedback manner II. つ1す、MFB(モ
ーショナル・74−)+ドパツク)がかけられる。 That is, the coil U generates an induced
current in proportion to the vibration of the peristaltic plate 18 under the influence of the
magnets A to D, m to D ', etc. This is used as an MFI signal. Therefore, according to the abovementioned speaker device, it goes without saying that the performance improvement can be
obtained, but the voltage due to the vibration of the electret is hardly influenced by the coil as #
1 and the appropriate MF8 signal is superior. In addition, since it can be simplified by the
deposition means 41 provided with a coil, etc., it is an expense only for adding a magnet, and an
extremely inexpensive speaker device with good performance can be obtained. In addition, it
becomes easy to obtain uniform performance of the speaker because self-correction becomes
possible, and it becomes easy to make the size or size smaller, and even if there is assimilation of
the shape in the product performance, uniformity is obtained and product reliability I also get. In
addition, the supporter of the magnet). The steps can be implemented in a variety of ways, and
the magnet support may be utilized as part of the support member. In the above embodiment,
although the fixed electrode and the movable electrode (diaphragm) have been described as 1 +
1 single types, it is needless to say that the present invention can be applied to a twin type book
whose number is further increased. As described above, the present invention can provide a
speaker device that can easily achieve uniform performance while offering further improvement
in performance.
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