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JPS5593179

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DESCRIPTION JPS5593179
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the
present invention, FIG. 2 is an equivalent circuit diagram of the circuit of FIG. 1, and FIG. 3 is a
sectional view of another embodiment of the present invention. is there. 1 · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · damper material, 7 · · · · · · power generation element.
DETAILED DESCRIPTION OF THE INVENTION The invention is directed to a directional
reverberation microphone that includes a reverberation output component. Conventionally,
reverberation microphones have been devised and used, in which a spring for signal delay is
incorporated in part of the microphone unit and the voice input is appropriately delayed and
output. Although such a microphone can obtain reverberation, it has been omnidirectional (1)
and thus has been inconvenient in actual use. This invention is made in view of this point. An
embodiment of the present invention will be described with reference to FIG. 1. Reference
numeral 1 denotes a case, in which a diaphragm 2 is stretched. Then, holes 6 and 4 are formed in
the front and back portions of the diaphragm 2 of the case 1 (in the embodiment, the side
portions). In one of the holes 6.4, a damper material 5 made of cloth, felt or the like is attached.
The base of the power generation element 70 is attached to the surface of the diaphragm 2 via
the supporter 6. A weight 8 is attached to the tip of the power generation element 7, and when
the diaphragm 2 vibrates due to the sound pressure, the power generation element 7 # 'i
accelerates in response to the acceleration, thereby generating power Generation)). Reference
numeral 9 denotes an output current from the power generation element 7 to an amplifier or the
like. Between the back surface of the diaphragm 2 and the back of the case 1, (2) a power
generating element 70 is provided with a spring 10 for delaying the power generation operation.
In this manner, the spring 10 is stretched (therefore, the vibration of the diaphragm 2 acts as a
resistance to the image pickup motion of the image pickup plate 2 until the spring 10 is
expanded or contracted, and thus the power generating element 70 is delayed. It causes Inside
the case 1, a foam material 11 is attached so as to surround the spring 10. Since this foam
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material 11 prevents excessive lateral deflection of the spring 10 and adjusts the size of the
chamber (back air chamber) behind the diaphragm 2, by changing the shape of the case 1 itself,
The function of this reverberation microphone configured as described above can be replaced
with this foam material 11, and the diaphragm 2 vibrates the diaphragm 2 through the hole 6 on
the front surface of the case 1. At that time, the imaging motion is transmitted to the spring 10
and hits the case 1 to again capture the imaging plate 2 as a reflected wave. As a result, the
power generation element 7 generates an audio current as a reverberation. At this time, since the
damper material 5 is stretched in the hole 4 drilled to face the back (3) portion of the diaphragm
2, as shown in the following equivalent circuit, the unidirectionality is It will be obtained.
FIG. 2 is an equivalent circuit of the circuit of FIG. In this figure, Po: voltage applied to the front
of the diaphragm So: effective area of the diaphragm 2 equivalent impedance of the diaphragm
including elements etc. C: equivalent of back air chamber of the back of the diaphragm Stiffness
M: Equivalent mass of damper material R: Equivalent resistance of damper material (Note that the
equivalent impedance due to the cover is omitted) With such an equivalent circuit, it is possible
to obtain unidirectionality. , Is widely known in the field. FIG. 5 shows another embodiment of the
present invention. In this case, the power generation element 7 is attached to the back (4) of the
case 1, and the spring 10 is stretched between the tip of the power generation element 7 and the
diaphragm 2. Also in this case, the same effect as that of FIG. 1 can be obtained. In the
embodiment described above, although the acceleration type pickup by the power generation
element 7 is used as the power generation mechanism, the other structure, that is, the diaphragm
2 itself is a piezoelectric film to be a power generation element The effect of will be obtained.
Since any device is configured as described above, there is an effect that it is possible to obtain a
directional microphone including a reverberation output component with a very simple structure.
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