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JPS5463749

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DESCRIPTION JPS5463749
Description 1, title of the invention
Electrostatic transducer
The present invention relates to an electrostatic transducer, and more particularly to the
improvement of a diaphragm (movable electrode) in a push-pull type using a pair of electrets
having opposite charges. In recent years, electrets tend to be used in electrostatic transducers
used for speakers and the like because they can be dispensed with using biased power supplies.
FIG. 1 shows a conventional electrostatic transducer which has been push-pulled using such an
electret, and in this case, it is formed by depositing gold A thin films 112 and 113 on both sides
of the polymer thin film III. A pair of fixed poles 12.degree.13 consisting of electrets 121 and
131 having positive and negative charges equal to each other on both sides of the same plate
(movable pole) 22- is formed. . Here, if the electrets 121.1111 having the same charge as each
other have equal voltages, the both sides of the diaphragm (movable electrode) 22 are best
balanced to operate as letter push-pull type, and distortion is possible. A transducer with reduced
characteristics is realized. By the way, in this case, the wiring method for the signal line is limited
in order to use the nichromets having the same sign of each other, and inconspicuous defects
become noticeable in response to the request of reducing the impedance as much as possible.
The EndPage: 1 so we can change the line direction to 1, to the signal line, in order to respond to
the low kd of this thick, and thus this (and thus the use of electrets that can make the impedance
as small as possible) On the other hand, it is considered to use electrets which are designed to
have charges of different signs with each other. However, an electrostatic transducer using
electrets having different sign charges with each other in this manner vibrates under the same
conditions as in the prior art, ie, when the voltage absolute values of both electrets are equal and
the gaps are also equal. A new defect such as an increase in strain caused by inability to balance
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on both sides of the plate (movable pole) is introduced, and it has not been put to practical use
even though it has been able to meet the demand for angular impedance. The reason why the
balance of the vibration plate (movable pole) can not be balanced is that the diaphragm is
negatively attracted to the negative 1d load t (the electret of the screen is strong)-until it
becomes clear So far, it has not been determined why such phenomena themselves occur.
Therefore, the present invention has been made in view of the above points, and is to improve
the diaphragm (movable electrode) so that the dielectric is provided on the surface 14 + I
opposite to the electret fixed electrode at least on the negative load side. Further, the balance of
the diaphragm (movable electrode) can be maintained to suppress the increase of distortion as
much as possible, and hence it is possible to put into practical use the push-pull type itself using
electrets having different sign charges of positive and negative signs. A) very good electrostatic
transducer. An embodiment of the present invention will now be described in detail with
reference to the drawings. That is, as shown in FIG. 2, a pair of electrets 7 constant poles 21 * 22
whose absolute values are equal to each other so as to have positive and negative different sign
charges are paired at a predetermined distance. The diaphragm (movable electrode) 23 is selfexcited so that the gap d of the air 1i 111 or 1 и qik is equal to the central portion between the
electret fixed poles 21 and 22 having a pair of positive and negative different sign charges. In
this case, the diaphragm (town excitation pole) 23 has a surface facing the electret fixed pole 2I
of shellfish 1-D with a dielectric 231 such as a polymer capsule membrane, and ? with an
electret fixed pole 22 of 9 + 11 The opposing surface is a quadruple 232 such as a metal thin
film, and these ui- '), the body 231 and the conductor 232 are integrally joined so as to form a
bone joint. In the electrostatic transducer configured as described above, the electret fixed
electrode 21s2Z having a pair of oppositely different sign charges and the diaphragm (movable
plate) 23 are appropriately connected to a signal line (not shown). The potential of the pole 23 is
used as a neutral point or a ground point. By the way, in this case, the diaphragm (movable
electrode) 23 has a surface facing the electret fixed electrode 2Z of the negative charge fill
formed by the dielectric 231 such as a polymer film, so that the dielectric 231 as a whole is
negative. I am charged to charge. As a result, the diaphragm (movable electrode) 23 has
substantially equal gaps d on both sides and an electret fixed pole having a pair of positive and
negative different sign charges: even if the absolute value of the X pressure is made equal, Since
the potential difference with respect to the electret fixed pole is reduced, it is possible to
suppress as much as possible distortion that increases the balance on both sides without being
strongly hit by the electret fixed pole on the negative charge side as in the prior art. Can have a
positive push-pull effect. FIG. 3 shows another embodiment. In this case, the diaphragm (movable
pole) 33 has a dielectric 331.332 facing on the side facing the electret fixed pole 31.degree. 32
which has either positive or negative charge. In the present embodiment, the four conductors
333 are integrally joined between the dielectrics 331.332.
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And negative i1! The operation and effect of the dielectric 331 on the side facing the load side
electret fixed pole 3I are the same as in the case of FIG. When the dielectric 332 on the side
opposite to the electret fixed electrode 32 on the positive charge side is EndPage: 2 or if this is /
good, the diaphragm (movable object) 33 has some cause and the positive charge t11 In the case
of contact with the fixed / imtracted part 32 of the fixed part, the end face leaks in the positive
charge side fixed pole 32 through the conductor 333 and the positive potential drops and the
inconvenience such as reduction is eliminated in advance. It is possible to follow the possible
effects, and to realize a transducer with more stable characteristics. Therefore, as described
above in detail, according to the present invention, the diaphragm (movable object) is improved
by providing the dielectric on at least the surface 411 + facing the electret fixed pole on the
negative charge side. A very good electrostatic transducer capable of maintaining the balance of
the animal) and suppressing the increase of strain as much as possible, and thus making it
possible to put into practical use the push-pull type itself using an electret having a different sign
charge. It can be provided.
4. Brief Description of the Drawings FIG. 1 is a block diagram showing a conventional
electrostatic transducer, FIG. 2 is a block diagram showing an example of the electrostatic
transducer according to the present invention, FIG. 3i, J: It is a figure which similarly shows
another Example. 21.22 иии Electret fixed pole, 23 и и и Vibration plate (movable object), 231 и и и
dielectric, 232 и и и conductor. Applicants Attorney Attorney Takehiko Suzue EndPage: ?
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