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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a push-pull electrostatic speaker according to
the prior art, and FIG. 2 is a push-pull electrostatic speaker according to an embodiment of the
present invention. 1.2 · · · · · · · · · Fixed electrode, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · moving the metal thin film deposited, 5 · · · · · · · · · · · · · ·.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the prevention of
electrostatic charge on a diaphragm for an electrostatic electroacoustic transducer such as a
speaker or a microphone. Conventionally, as a diaphragm for an electrostatic electroacoustic
transducer, A conductive thin film is used which has a metal thin film such as aluminum
deposited on the surface of the plastic thin film. However, this type of diaphragm is charged
when it is charged on the surface opposite to the metal-deposited surface and the electrostatic
attraction force between this static electricity and the fixed electrode causes the diaphragm to
vibrate with a large amplitude or When the diaphragm is moved to a large extent by an external
force, it may come in contact with the fixed electrode or stick to the fixed electrode in the
extreme case. The object of the invention is to remedy the drawbacks of the prior art devices
described above. First, the detailed operation of the conventional device will be described using
the speaker as an example. What is shown in FIG. 1 is a well-known zon-u-sol type quiet speaker,
in which a diaphragm 3 made of plastic or the like is stretched at the central position of upper
and lower fixed electrodes 1 ° 2. The movable electrode is formed by vapor-depositing a thin
film 4 of O metal such as aluminum on the upper surface of A bias voltage for polarization is
applied via the high resistance R between the movable electrode and the upper and lower fixed
electrodes. A gold foil or thin film is deposited on one side, since the movable electrode required
for the operation of the electrostatic speaker is in principle sufficient on one side. Now, if the
input signal is zero, the electrostatic force acting between the movable electrode and the upper
and lower fixed electrodes is not in balance, and the diaphragm is at the center position.
However, when the vibrator is moved upward from the central position, for example, as shown in
FIG. 1 by a manual signal and 2-r, ', the following force is generated on the diaphragm in addition
to the force by the input signal. No. (A) The electric charge moved in the movable electrode (m) +
<crab FIF1 '(negative moon represents a downward force due to a bias voltage) (ii) the electric
charge induced on the opposite surface of the movable electrode Working crab F2 → →
restoring force by tension of diaphragm; −F3 And, if the amplitude is not excessive, the
relationship of Fl−Fl ′ +, F2 (F3 holds, and the speaker is operating normally. However, the
movement of the charge in the movable 'ifEm' in (a) above is almost negligible for a signal of a
somewhat higher frequency because it is movable, the surface resistance of the r pole is
extremely high (F, − F, 'in O), when the frequency is low and the charge can follow sufficiently,
FI-F1' F F2 F F3 against large-amplitude photographing movement or large tax movement of the
diaphragm due to external force In such a case, the diaphragm may come in contact with a fixed
stack or, in an extreme case, be stuck to the surface.
This invention solves the above-mentioned problems with a very simple structure, and its
embodiment will be described with reference to 21'la. (A member denoted by the same reference
numeral as that in FIG. 1 represents the same member. 1) The difference from the one in FIG. 1 is
that the surface of the diaphragm 3 opposite to the movable electrode 4 is coated with an antibanding agent 5 such as the surface active agent 11 to give conductivity. By doing this, the
charge induced on the opposite surface of the (mouth) movable electrode described in the
operation explanation of the above-mentioned conventional device is 1.51. Force F2, which can
be prevented. By the way, band market-like anti-surfactant. Since the ion is the main conductive
carrier, the influence of humidity is large and the stability is lacking, and the change with time is
remarkable. Therefore, it is appropriate to use the diaphragm to have the relatively high
conductivity required as the movable electrode. Although it is not, as in the present invention, it
is 4- that can be stably maintained for a relatively long time if it has a relatively low conductivity
that merely prevents total electrification. In addition, since it is only applied to the surface on the
opposite side to the movable electrode, there is an advantage that it can be technically easily
implemented and cost-effective as compared to metal deposition. The diaphragm for the
electrostatic electroacoustic transducer according to the present invention can prevent the
contact or sticking with the fixed electrode due to the band stop by adopting the configuration as
described above. In order to increase the conversion efficiency, it is possible to easily reduce the
distance between the fixed electrode and the vibration transfer or to increase the bias voltage.
Moreover, since the antistatic agent is merely applied to the side opposite to the movable
electrode of the conventional device, it is technically very simple, and the practical effect is
extremely large.
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