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Description 1, title of the invention
Electrostatic acoustic transducer
3. Detailed Description of the Invention The present invention relates to an electrostatic acoustic
transducer, the object of which is to provide an excellent five-sided acoustic transducer capable
of changing directivity characteristics with a simple configuration. It is to do. Generally, in order
to make the directivity of the electrostatic type microphone device variable, the microphone unit
of FIG. 5 is varied as omnidirectional-unidirectional-bidirectional with the circuit configuration of
FIG. That is, as shown in FIG. 5, the microphone unit is provided with a diaphragm 1.1 'attached
to the two sides of the electrode 6 so as to be opposite to the electrode 6 and attached to the gap
7 "-+3, 3 / and the diaphragm fixing ring They are fixed in a laminated manner by the
fixing frame 4. Then, with respect to the above-mentioned microphone unit, as shown in FIG. 4,
by changing the DC bias voltage with the variable resistor R1, the microphone unit A composed
of 1-2-3-5 and 1'-2'- The microphone unit B composed of 3'-5 was switched. In such an
electrostatic type microphone device, when the DC bias voltage is A, the microphone units A and
B have reverse single directivity, the output after output addition becomes omnidirectional, and
the DC bias voltage is Sometimes the microphone unit) A works only unidirectionally, and when
the DC bias voltage is C, the microphone units A and B become 180 'different in phase and
EndPage: 1 reverse unidirectionality and output after output addition Is bi-directional. However,
in the case of this method, two diaphragms are required for the microphone unit, and it is
difficult to separate the microphone units A and H as an acoustic circuit, and the structure
becomes complicated. Therefore, the unidirectional condition is There is a drawback that it is
difficult to fit together and is difficult to mass-produce. The present invention eliminates the
above-mentioned drawbacks, and is constructed as a combination of nondirectionality and
bidirectionality, which is relatively easy to produce (make) microphones. Hereinafter, the present
invention will be described with reference to the drawings of one embodiment. 1 and 2 show the
microphone unit of the present invention, in which the diaphragm 1 held on the diaphragm plate
retaining ring 2 is supported by an insulator 4 such as ceramic which pushes up the diaphragm 1
concentrically, and a ring-shaped counter electrode It opposes to the electrode which has 5 and
the circular-shaped counter electrode 6. The back air chamber 6 is provided by the insulator 40
portion holding the ring-shaped counter electrode 5, and the hole 7 and the resistance member 8
satisfy the bi-directional condition as a phase shift circuit to make a bi-directional microphone
unit. On the other hand, the back air chamber 9 is provided at the portion of the insulator 4 that
holds the circular counter electrode 6 in the center, and the high impedance resistance where air
leaks slightly at the lead portion of the counter electrode 6 and the insulator 4 It becomes an
omnidirectional unit by providing.
In other words, the omnidirectional microphone is realized at the central portion and the
bidirectional microphone at the outer peripheral portion. Fig. 3 (shows a control circuit for
changing the directivity of the above-mentioned microphone unit, and the output from the
nondirectional microphone at the center is amplified by the amplifier 1o and added to the
attenuator 11, The output from the bi-directional microphone on the outer peripheral portion is
amplified by the amplifier 12 and added to the attenuator 13, and the outputs of the nondirectional microphone and the bi-directional microphone by the control voltages vA and VB to
the attenuator 11.13. By combining the level control and the adder 14 to change their output
levels, it is possible to change the directivity from omnidirectional to unidirectivity to
bidirectivity. In other words, if the control level of the attenuator 13 is increased with respect to
the attenuator 11 to reduce the output level of the bi-directional microphone, the nondirectionality becomes stronger, and the control is reversed to reduce the output of the nondirectional microphone Then, bi-directionality becomes strong, and uni-directionality can be
realized by controlling between them. Since the microphone unit mentioned above is
omnidirectional and bidirectional, it is advantageous that the directivity condition can be set to
the two stable points, and in particular the sensitivity is sufficiently high even if the
omnidirectional outer diameter is about 5 B It is easy to obtain, cheap to produce, and high in
mass productivity. In addition, although the vibrating membrane is divided into two in terms of
vibration form, it is simple and it is sufficient to adjust the tension according to the bidirectionality because it is composed of a single vibrating membrane, the feature of Ω requiring
few adjustment processes is also a feature one of. Incidentally, although the d microphone
apparatus has been described in the embodiment of -F, it goes without saying that the present
invention can be applied to a speaker. As described above, according to the present invention, it
is possible to provide an electrostatic acoustic transducer capable of changing directivity
characteristics with a simple configuration.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of an essential part showing
an embodiment of the electrostatic microphone device of the present invention, FIG. 2 is a plan
view thereof, and FIG. 3 is a variable reservoir of directivity of the device. FIG. 4 is a circuit
diagram of a conventional electrostatic microphone device, and FIG. 5 is a cross-sectional view of
the main part of the control device of FIG. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · insulator · 6, 6 · ·
· · · · counter electrode, 7 · · · · · · · · · · · · · · · · · · 8 · · · · · · · · · · · · · · · · · · backspace. Name of agent
Attorney Nakao Toshio 1 other EndPage: 2 2nd lr! Al 3S Figure 4 EndPage: 3
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