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JPS56165499

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DESCRIPTION JPS56165499
Description 1 Title of Invention
Electrostatic transducer
3. Detailed Description of the Invention The present invention relates to an improvement of an
electrostatic electroacoustic transducer suitable for use in, for example, a headphone. Heretofore,
there has been known a single type electrostatic electro-acoustic transducer used as a headphone
or the like, as shown in FIG. That is, the spacer ring 14 which provides a predetermined gap on
the fixed electrode 13 formed by depositing the electret 12 of the charge on the back electrode
plate 11 having a large number of small holes for communication, for example And an n 'moving
electrode (diaphragm) 15 is provided in pair. Thus, by connecting the fixed electrode 13 and the
movable electrode (diaphragm) 151ijj (the number g E is connected to strengthen or weaken the
offset charge at the time of static by the electret 12, the movable 11L pole (vibration Plate (15)
with respect to the fixed electrode 13 as shown in FIG. 2 (aJ as shown in FIG. 2 (9) when
repelled), the electric vibration wave as shown in FIG. You will be beaten. However, although
such a single type of hodoon can be easily configured with a small number of parts, it is
theoretically possible that considerable distortion is generated in the output sound pressure wave
obtained due to an imbalance at the time of static. Was inevitable. That is, as shown in FIG. 2 (a),
since the movable 'electrode (diaphragm) 15 is at the fixed tIL & 13 position indicated by the
solid line in the static state, the suction side EndPage: 1 is sensitive and repulsive side As a result
of carrying out an asymmetric operation that vibrates slowly, as shown in FIG. 6B, the fidelity
with respect to the signal waveform is each respectively generated, and a large amount of evenorder distortion mainly occurs. For this reason, although the occurrence of the distortion as
described above can be avoided in principle if it is constructed in the Butzhnor equation, this
increases the number of parts and results in a complicated configuration. Therefore, the present
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invention has been made in view of the above-described points, and is an extremely good powersaving type improved to be able to reliably remove the ridge distortion by the asymmetric
operation with a simple configuration without increasing the number of parts. The purpose is to
provide an electrical sound converter. That is, the electrostatic type electric sound jII converter
according to the present invention divides the polarized charge given to the movable electrode
(diaphragm) into positive and negative parts and drives them in reverse phase, and outputs the
respective output sound pressure waves in blue It is characterized in that it is configured to be
able to cancel out the distortion purple which is generated in the opposite phase relationship
with each other due to the coupling b. An embodiment of the present invention will now be
described in detail with reference to the drawings.
That is, in FIG. 3, reference numeral 21 denotes a back electrode plate having a large number of
communicating small holes H, which serves as an electrode extraction portion or a central
separation band of a movable electrode (diaphragm) described later on this back electrode plate
2 For example, a negative electrode (electrification electret 23 is attached to the left half
equivalent portion divided by the central spacer 22 which can be functioned, for example, a
positive (+) electrification electret 24 for the right half equivalent portion illustrated) 2 by which
the fixed electrode 25 is formed by being deposited, and the fixed electric current which hangs!
Movable electrodes (diaphragm) 27 are paired on the IIL 25 via a spacer ring 26 having a height
equal to that of the central spacer 22 and providing a predetermined gap f. Further, an air
chamber 29 having a predetermined volume is formed by a bottomed cylindrical case 28 on the
opposite side of the movable electrode (diaphragm) 27 to the opposite side to the fixed electrode
25. Thus, by connecting the signal source E between the fixed electrode 25 and the movable
electrode (diaphragm) 27 in the above configuration, the bias charge at the time of static by the
electret 23.24 is strengthened or integrated If the movable electrode (diaphragm) 27 is attracted
or repelled with respect to the fixed electrode 25 as shown in FIG. 4 (1), the movable electrode
(diaphragm) 27 is equivalently shown in FIG. And so on, the left half and the right half are driven
to each other V (opposite phase relationship “′ ′ ′ ′ ′ C ′ C, so that the distortion
according to the synthetic air vibration wave, ie, the signal strength as shown in FIG. Output
sound pressure wave is obtained. In this case, the movable electrode (diaphragm) 27 in this case
is biased toward the side of the fixed electrode 25 across the central spacer 22 by the negative
electret 23 in the left half and the construction electret 24 in the right half on the fixed electrode
25. It takes a static position as in the fourth section (a), but it acts to weaken the right half when
the signal from the signal source E between the two rooms% 27 and 25 strengthens the left half.
After all, the left half and the right half vibrate in antiphase with each other, and become
equivalent to the driving state as shown in FIG. 4 (b). And since the continuous hole vibration in
the left half and the right half of the movable electrode (diaphragm) 27 comes to be coupled in a
blue folding manner by the presence of the air chamber 29, as shown in FIG. 4 (c). The air
vibration waves having even-order distortion in the upper half or the lower half are synthesized
so as to be in phase with each other so that an output sound pressure wave with no distortion V
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in which the even-order distortions are canceled is obtained. In the above, the central spacer weir
22 can be made to function as the electrode extraction portion or the central separation zone of
the movable electrode (diaphragm) 27 and can be made very convenient.
FIG. 5 shows a specific example and a modified example of the electrode shape in the above and
a divided shape for driving the electrode shape partially in reverse phase relation to each other.
That is, FIG. 5 (,) is the case where the EndPage: 2 circular electrode assumed in the embodiment
of FIG. 3 is divided into two on the left and right with the center line as the boundary, and FIG. In
the figure (c), the circular electrode is divided into three into left, middle and right parts. Also,
FIG. 6 (d) shows rectangular electrodes divided into right and left with the center line as a
boundary, and FIG. 6 (,) shows twin circular electrodes divided into two for each unit circular
electrode. In the figure, (f) shows four open field electrodes around the central main circular
electrode. The present invention is not limited to the embodiments described above and shown in
the drawings, and it is needless to say that there can be many variations and applications without
departing from the scope of the present invention. Therefore, as described above in detail,
according to the present invention, an extremely good electrostatic electro-acoustic transducer
improved so as to reliably remove distortion due to asymmetric operation with a simple
configuration without increasing the number of parts. It becomes possible to offer. 4. Brief
description of surface Fig. 1 and Fig. 2 are block diagrams showing a conventional single-type
electrostatic electro-acoustic transducer and operation explanatory diagrams thereof, Fig. 3 and
Fig. 4 show static according to the present invention. FIG. 5 is a block diagram showing one
embodiment of the electro-electro-acoustic transducer and its operation explanatory diagram,
and FIG. 5 is a diagram showing a specific example and a modification of the electrode shape
used in the embodiment. 21: back Km plate, 22: central spacer, 23.24: electret, 25: identification
electrode, 26: spacer ring, 27: movable 'Wt pole (diaphragm), 28: Case, 29: Electric room.
Applicants Attorney Attorneys Takeshi Suzue Fig. 1 B Fig. 3 (a) (b) (e) Fig. 2 (a) (b) (C) to 8 p + to
8 f- to trIA (c) ( d) EndPage: 3
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