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DESCRIPTION JP2002078062

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DESCRIPTION JP2002078062
[0001]
FIELD OF THE INVENTION The present invention relates to a lapel microphone having two
microphone capsules, one for active use and one for spare (herein, the term "reserve" means that
it is used when the active fails). In the book, it refers to a double capsule microphone).
[0002]
2. Description of the Related Art In a double-capsule microphone having two microphone
capsules, currently used and a spare one, conventionally, two circular vibrating membranes are
used, and the membrane surfaces of these vibrating membranes are each in the axial direction of
the microphone It was arranged back and forth so as to make a 90 degree. Also, the output cable
was out of the extension of the axis of the microphone.
[0003]
In a conventional double capsule microphone using two circular diaphragms, the sensitivity is
proportional to the effective area of the diaphragm, so if the diameter of the microphone is
reduced, the diaphragm There is also the problem that the area is also reduced, thus reducing the
sensitivity of the microphone.
[0004]
Also, as in the prior art, if two vibrating membranes are arranged back and forth, the back
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vibrating membrane will be positioned behind the front vibrating membrane, so the front
vibrating membrane is the back vibrating membrane. There is a problem that the sound wave
incident on the light source is disturbed, and it is difficult for the sensitivity and frequency
characteristics of the two microphones to be uniform in a high frequency band.
[0005]
Furthermore, as in the prior art, when the output cable is extended on the extension of the axis of
the microphone, the output cable draws a loop from the underside of the microphone when the
performer wears the microphone, and the clothes are There was a problem that the output cable
was seen by the television camera and it was noticeable.
[0006]
The object of the present invention is, as described above, to reduce the sensitivity of
microphones, to make it difficult to match the sensitivity and frequency characteristics of two
microphones, and to solve the three problems of an output cable appearing on a television
camera and being noticeable. Providing a double-capsule microphone.
[0007]
SUMMARY OF THE INVENTION To achieve the above object, the double capsule microphone of
the present invention is a double capsule microphone comprising two microphone capsules,
wherein the two microphone capsules are respectively rectangular. It is characterized in that it
has a vibrating membrane.
[0008]
Further, the double capsule microphone according to the present invention is characterized in
that the two microphone capsules are disposed on a straight line and respectively symmetrically
with respect to an intermediate position between the two microphone capsules.
[0009]
The double capsule microphone of the present invention is characterized in that an output cable
from each of the two microphone capsules exits from the center of the two microphone capsules
on the straight line.
[0010]
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DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail
based on the embodiments of the invention with reference to the accompanying drawings.
FIG. 1 is an external view of an embodiment of the double capsule microphone according to the
present invention.
In FIG. 1, 1 and 2 are microphone capsules (respectively used and spare microphone capsules), 3
is a sound wave introduction port, 4 is a support portion, and 5 is an output cable.
[0011]
In the present embodiment, the microphone capsules 1 and 2 are both arranged on a straight
line A and symmetrically about the central axis B, and the output cables from the microphone
capsules 1 and 2 are microphone capsules, respectively. It is attached along the central axis B to
the support 4 between 1 and 2.
[0012]
Next, the structure of the microphone capsules 1 and 2 will be described.
FIG. 2 is a cross-sectional view of the microphone capsules 1 and 2 cut in a plane formed by the
straight line A and the central axis B and viewed from the lateral direction.
In FIG. 2, 3 is a sound wave introducing port, 5 is an output cable, 6 is a vibrating membrane, 7 is
a back electrode, and 8 is an impedance converter.
In FIG. 2 as well, the same parts as in FIG. 1 are indicated by the same reference numerals.
[0013]
The operation of the microphone capsules 1 and 2 will be described.
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In the present embodiment, the diaphragm 6 to be used has a rectangular shape, and the
diaphragm 6 and the back electrode 7 constitute a condenser type microphone.
Sound waves to be picked up are guided from the sound wave introduction ports 3 of the
microphone capsules 1 and 2 and move the vibrating membrane 6.
Thereby, the capacitance of the parallel plate capacitor formed of the vibrating membrane 6 and
the back electrode 7 is changed. This change is captured as a voltage change, converted to a low
output impedance by the impedance conversion unit 8, and output from the output cable 5.
[0014]
Here, the area of the film surface (the area of the film surface is in proportion to the sensitivity of
the microphone) for the case where the vibrating film 6 is made rectangular (in the present
invention) and the case where it is circular (conventional) Compare. In FIG. 3, since the length in
the longitudinal direction of the rectangular diaphragm is related to the total length of the
microphone, assuming that the maximum dimension is 6 mm, the inside diameter of the
microphone capsule when the length in the lateral direction is interlocked with the inside
diameter of the microphone It is the graph which calculated | required the relationship between
the area of a circular diaphragm, and the area of a rectangular diaphragm with respect to (the
diameter which a diaphragm can actually occupy). It can be seen from FIG. 3 that when the inner
diameter of the microphone capsule is 7.5 mm (point P) or less, the area of the rectangular
vibrating film having a length of 6 mm is larger, and therefore high sensitivity can be obtained.
Now, assuming that the inner diameter of the microphone capsule is 3 mm, the circular vibrating
membrane requires an inner diameter of about 5 mm in order to obtain the same area as that of
the rectangular vibrating membrane. In other words, when a rectangular diaphragm is used, the
inner diameter can be reduced to 3 mm while maintaining the sensitivity of the circular
diaphragm having an inner diameter of 5 mm.
[0015]
FIGS. 4A and 4B show the measured values of the sensitivity and frequency characteristics of the
double capsule microphone of the present invention in which each microphone capsule has a 6
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mm × 3 mm rectangular diaphragm. From FIGS. 4A and 4B, in the double capsule microphone of
the present invention, the microphone capsules 1 and 2 are disposed symmetrically on the
straight line A (see FIG. 1) and about the central axis B (see FIG. 1). Because of this, the
characteristics of the microphone capsule 1 (FIG. 4A) and the characteristics of the microphone
capsule 2 (FIG. 4B) are substantially the same.
[0016]
FIGS. 5 (a) and 5 (b) are a front view and a side view, respectively, when the performer wears the
double capsule microphone of the present invention. As can be seen from FIG. 5A, from the front,
the output cable is hidden behind the microphone body and can not be seen.
[0017]
FIG. 6 shows an example in which the double capsule microphone of the present invention is
attached to a tie pin type holder clip.
[0018]
According to the present invention, the double capsule microphone can be miniaturized without
reducing the sensitivity, and two independent outputs having equal sensitivity and frequency
characteristics can be obtained, and from the front, Since the output cable can not be seen, a
double-capsule microphone with good television image can be realized.
[0019]
Brief description of the drawings
[0020]
FIG. 1 is an external view of an embodiment of the double capsule microphone of the present
invention.
[0021]
FIG. 2 is a cross-sectional view of the microphone capsule cut along a plane formed by a straight
line A and a central axis B and viewed from the lateral direction.
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[0022]
FIG. 3 is a graph showing the relationship between the area of a circular vibrating membrane and
the area of a rectangular vibrating membrane with respect to the inner diameter of a microphone
capsule.
[0023]
FIG. 4 shows measured values of sensitivity and frequency characteristics of the double capsule
microphone of the present invention.
[0024]
FIG. 5 is a front view and a side view of the present invention dual capsule microphone when
worn by a performer.
[0025]
Fig. 6 shows an example in which the double capsule microphone of the present invention is
attached to a tie pin type holder clip.
[0026]
Explanation of sign
[0027]
1, 2 Microphone capsule 3 Sound inlet 4 Support 5 Output cable 6 Diaphragm 7 Back electrode
8 Impedance converter
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