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JPS5169839

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5169839
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrostatic transducer, and FIG. 2 is a cross-sectional view of one embodiment of the
electrostatic transducer of the present invention. E: electret 23, movable electrode 24, vibrating
membrane 25, annular holder 26, vibration absorbing member 1/14 (/ 1316116 ee ・ · ee 712
Fig. 2 3103-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic
transducer having a fixed electrode and a movable electrode. 近年 In recent years, a flat fixed
electrode and a thin film movable 1F pole are made to face in parallel and movable An
electrostatic transducer has been developed to drive the entire surface of the 1I vibration lI ヲ ·
This electrostatic transducer is, as shown in Fig. 1, for example, from a fixed electrode L1
attached with Etathrette IIYt and a copper body The insulating spacer 16 is cast between the
annular holder II and the fixed 112, and the fixed electrode L ′ ′ is attached to the fixed
electrode L ′ ′. There are a large number of through holes 11 provided by the engineering
god. Even if the above-mentioned electrostatic transducer is used as a bisby force, a signal is
applied to the movable electrode this and the fixed electrode 1-1 ◎ eg, the diaphragm 2 of the
electret 11 is opposed (2) Assuming that the vibrating film 14 is positively charged, the opposite
direction is negatively charged, and an alternating current signal is added to both of the 11th @,
and the charge of the electret 11) is generated in a half cycle of this signal. In the second half
cycle, the electric charges of the electret JJ are weakened and deviated in the direction away
from the fixed electrode * x2. As described above, the diaphragm vibrates following the signal
deterioration and the air-acoustic conversion becomes possible. According to the conventional
electrostatic transducer of the above l118, the vibrating membrane 14 is stretched by a pair of
tensions and its eight edges are fixed by the holder 13 rcr and this holder Is is attached to the
fixed electrode 1 through the Gifu spacer 16 (+7 It is added h. For this reason, at the solid foot of
the holder IS and the scratcher 16, the vibration of the vibrating film 14 generates a reflected
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wave I1'11i, which interferes with the incident wave and results in a standing wave. Therefore, in
the specific oim 'fca, the present invention has a defect that this interference resonates and
produces an unpleasant sound. The present invention is intended to eliminate the abovementioned conventional defects, and absorbs the vibration due to the unnecessary reflected
wave. It is an object of the present invention to provide a static image transducer capable of
enabling better air quality-mechanical conversion. An embodiment of the invention X will be
described in detail with reference to FIG. 2. That is, in FIG. A2, U is a plate-like fixed w [ii, and a
large number of through holes 21 are provided. Then, the electret z2 is attached to the -10,000
surface of the fixed electrode l ", and the movable II pole L" is provided facing the electret side of
the fixed electrode L ".
This movable * 1h 23 is an annular holder 25 that lifts a very thin film, e.g., Al film, and an
annular holder 25 that spreads the peripheral edge of this reciprocation 24 with uniform tension.
It is supported by the vibration absorbing material z6 which has a double function and is
integrated with the fixed electrode 20. The vibration absorbing material 2c is formed into, for
example, a sponge shape and is made of a synthetic resin of dominant positive nature, and is
provided along the annular holder 25 so as to hold it from above and below. According to the
electrostatic transducer of the present invention configured as described above, the operation
base is identical to the one described in FIG. 1 above, for example, when used as a speaker,
movable i! Pole 23 and fixed N * z. The signal to the cabinet is auspicious. If it is assumed that
the surface facing the vibrating film 24 of the first Electret 22 is positively charged, the vibration
@ 2 (the opposite surface is negatively charged). When an alternating current signal is applied to
both electrodes [-, the electric charge of the electret 2z is strengthened in a certain half cycle of
this signal, and the peristaltic film z4 is biased toward the fixed lightning 1j, and in the next
bovine cycle On the contrary, the charge of the electret 22 is weakened, and the electric field is
squeezed from the fixed electrode -10. In this way, when the imaging motion 1I 24 vibrates
following polarization and the electro-acoustics recoupment becomes 〇 ÷ per-ml-4 days as
described above, the electrostatic type of the present invention The transducer is capable of
making the vibration state of the imaging film 24 extremely faithful to the signal change. That is,
according to the present invention, since the vibration absorbing member 26t is used to support
the movable electrode z3-, it is possible to suppress the occurrence of a reflected wave or a foot
standing wave as in the prior art on the vibration 1124. For this reason, only the input wave by
the signal exists on the vibration pZa, and when it is used as a sneaker, it can enable electroacoustic conversion faithful to the signal. In particular, it was intended to listen to electric tone.
In this case, it can be reproduced as an equalized sound to improve its fidelity V, and the
transducer of the present invention can give an effective effect tJ) to its performance. As
mentioned above, the X device can provide an electrostatic transducer that absorbs and extends
unnecessary reflections.
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