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Detail Cao 1, Name of Invention
11p% type transformer noyusa
3. Detailed Description of the Invention The present invention relates to a '41) transducer, and
more particularly to a microphone which has its directivity reduced to a single unit in a single
unit. In general, a W-range transducer such as a microphone, a headphone, or a speaker that is
completely configured as a sound-to-sound conversion yarn is either nondirectional, unidirectional or so-called eight-shaped directivity, etc. It is configured as having one directionality.
Although it is more convenient to be able to replace various directivity depending on the form of
use, in fact several units with desired directivity are prepared, It is inconvenient because it has to
be selected from among them, and since it is impossible to change the directivity unless such
preparation is made, a unit of the same directivity is used in any usage mode. The present
invention has been made in view of the above points, and it is an object of the present invention
to provide a very good electrostatic transducer capable of changing various directivity with a
single unit. An embodiment of the present invention will be described in detail with reference to
the drawings. That is, in the case of FIG. 1A, an outer case 1n has a square cross section, and
windows 111 to 114 are formed on each side of the outer case 11. Then, the first to fourth
electrostatic elements (1), ω), CC), O)) are disposed inside the windows 111 to 114 for the outer
case 1A. Here, the first to fourth electrostatic elements (g) to (ii) are spacers for sealing the back
surface portions of diaphragms (possible b4) l and 97 to 134 stretched on rings 121 to 124
respectively. The fixed poles 151 to 154 are arranged in pairs via 141 to 144, and in the case of
the illustrated, each fixed pole 151 to 154 is provided with electrets 121 to 174 on the back
electrode plates 161 to 164. It is used. The electrets 271 to 174 are charged such that one of the
opposite ones is different a8: and the other is the same polarity so as to be displayed as shown in
(I-) or (-). Further, each back electrode plate 161 to 164 is connected to each input end of the
composite switching circuit 18 provided integrally or separately with the outer case 11. Here, the
ground end of the composite switching circuit 1B is electrically coupled to the ground end of the
outer case 11, and the outer case 11 itself is formed of the respective rings 121 to 124 of the
first to fourth electrostatic elements. By being in contact, they are at the same potential as the
respective diaphragms (movable wedges) 131 to 141.
The space in the outer case IJ is filled with the insulator 19. As described above, an electrostatic
transducer configured to have four electrostatic elements in one unit as described above can
make it possible to select directivity by switching the composite switching circuit 18 It is. That is,
assuming that it is used as a microphone unit, first, as shown in FIG. 3 (a), only the signals from
the back electrode plates 161 and 163 of the first and third IW .chi. Elements (4) and (C) At the
time of switching so as to combine, any electrostatic element also has a back face of each
diaphragm (movable wedge) so as to be closed, thereby exhibiting an omnidirectional
characteristic as well as its own. However, in this case, since the electrification inertias of the
electrets 772 and 27J are made different from each other so that one side is (→, the other side
(−)), the directivity as a single body is shown in FIG. ) Or (C) 1 、, and since they are synthesized
here, the directivity (4) as a whole and the so-called figure of eight shown by (0 curve (the
oblique line m portion) Shape directivity It will be obtained. Next, for the synthesis of the signals
from the first and third electrostatic elements (4) and (C) described above, as shown in FIG. 3 (b),
the second and fourth electrostatic elements ω), (2) When the signal from the back electrode
plate 162 ° 164 of the back electrode plate is combined and switched as it is, the directional
EndPage: 2 focusing (the same polarity electret 172.1744f) by combining the latter is used. 2 (a),
it has an omnidirectional character represented by (B + D) 1111 M, so that the directivity as a
whole is the synthesized 80-letter directional character of the .chi. And .chi. Ten-D) Non- (curves
of (A + C) + (B100) curve shown by the broken line obtained by synthesizing with (one same-sex
one) by the curve become mono-directional. When obtaining nondirectionality in each case, as
described above, since each electrostatic element (4) to (4) itself is nondirectional as described
above, these may be used separately, but in the previous example It may be switched to use a
combination of the second and fourth electrostatic elements (8), [F]). Also, in the above, when
obtaining unidirectionality, the first and third electrostatic elements 合成, the combination of (C)
as shown in FIG. , And may be switched to combine only one of them.
Then, when obtaining the figure-like directivity of 8, since the previous example cuts the sound
source in the directions of 90 degrees and 270 degrees, the sound sources in the directions of 0
degrees and 180 degrees as shown in FIG. 2 (b) As shown in FIG. 3 (d), each of the second and
fourth electrostatic EL's (N ') and' 'of the electrets 172' and 174 'also have different polarities. It
is sufficient to use one that is charged to be Therefore, as described in detail above, according to
the present invention, it is possible to select the raw directivity with a single unit, and it is
possible to eliminate the conventional inconvenience and irrationality. Can be provided. The
present invention is not limited to the above-described and illustrated embodiments, and it goes
without saying that various modifications can be made without departing from the scope of the
present invention. For example, the fixed electrode may be used as a normal electrode, and the
diaphragm (rotator) side may be used as an electret, or another DC power supply may be used to
apply a bias to the chair n side without using an electret. The fourth aspect of the present
invention is an electrostatic transducer 2 according to the present invention. 1) Outer case, 111
to 114, window, (4) to (2), electrostatic element, 121 to 124, ring, J,? J-1, 94 ... diaphragm (rotary
machine), 141 to 144 ... spacer, 151 to 154 ... fixed exchange, 161 to 164 ... back electrode plate,
171 to 274 ... electret, 18 ・ ・ ・ Composition required l! O1 path, 19 ... insulation. Birth agent
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