JPS5652386

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DESCRIPTION JPS5652386
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the present invention,
and FIG. 2 is a longitudinal sectional view thereof. 1 wire cover 2 wire winding car 3 plug in 4
earphones 5 wires 6 grooves 7 7 earphones stop 8 holes.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a nondirectional
microphone Kll suitable for use as a built-in microphone of a tape recorder or the like. As a
conventional nondirectional microphone, a microphone as shown in FIG. 1 has been proposed.
That is, in FIG. 1, (11 is a microphone capsule, and the microphone capsule [11 is a diaphragm
12 made of duralmin, titanium, plastic or the like, etc.)] a diaphragm (1a), and this diaphragm (la)
Correspondingly, it is arranged from the back plate (IC) at a predetermined interval via the
spacer (lb). In addition, (3 (shows a cylindrical holder formed of a synthetic resin or the like, and
this holder (31 is fixed with the above-described ink capsule (1). Also, the back plate (IC) is
electrically connected to the input terminal (5a) K of the head amplifier (5) via the contactor (41),
and the ground terminal (5b) and the output terminal (5C) Derive). The head amplifier (5) can be
obtained by setting the rubber pad (6) to the inner side Kl jl of the holder (3) by subjecting the
ground terminal (5b) of the head amplifier (51) and the output amplifier (5C) to rubber pad + 61
penetration. Securely fix the inside IKB of the holder (3). (2)-V1 voice), "'le; 〃 11 11 L, further
busy, this capsule, the above integrated microphone capsule (1) and holder (3) in a cylindrical
capsule case f71 Cover with the case (71 below and ground plate (8 :). In this case, the terminal
(8a) of the ground plate (8) is connected to the head amplifier (the ground terminal (5b) of the
head amplifier 51). In FIG. 1, (9.nu. is a small hole for characteristic correction. Since the
nondirectional microphone shown in FIG. 1 is configured as described above, the dynamic film
(2) of this microphone vibrates when the K sound pressure is applied, so that the vibrating film
(2) vibrates. And the number of charges stored in the capacitor formed by the vibrating
membrane (2) and the pack plate (1c) increases. Since the output voltage (5C) of the head
amplifier 5 can be reduced, an output voltage corresponding to the amount of increase or
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decrease of the charge, that is, an output voltage corresponding to the sound pressure can be
obtained. Work. However, the frequency characteristic of the nondirectional microphone as
shown in FIG. 1 shows the frequency characteristic as shown by the solid line a in FIG. 2 (3)), and
it is used as wind noise or, for example, a built-in electronic microphone of a tape recorder. In
this case, low frequency noise such as motor vibration noise is picked up with high gain.
Therefore, when recording, wind noise and motor vibration noise are also recorded with high
gain along with the main signal, and noise is generated during reproduction. Since it is
reproduced together with the main signal, the main signal is inconvenient to hear due to the
influence of noise, which causes inconvenience to the audience.
In view of such a point, the present invention has a simple configuration without the
characteristic that the low range of about 200 Hz or less is attenuated as shown in FIG. It should
be noted that it is possible to reduce the low frequency noise of the motor and the peristaltic
noise of the motor. Hereinafter, an embodiment of the omnidirectional microphone of the present
invention will be described with reference to FIG. 3. In FIG. 3, parts corresponding to FIG. 1 are
given the same reference numerals, and the detailed description thereof is omitted. . That is, in
the present embodiment, the concave portion (3a) is provided in a part of the holder (31). Also,
corresponding to the position of the concave groove (41 key '5> (3a) provided in the holder (31),
the concave groove (7a) is similarly provided from the inner upper portion to the side portion of
the capsule case (7). In this case, the width of the grooves (3a) and (7a) provided with the holder
(3) and the capsule case (7) K is, for example, 0.5 m. Others are configured as in FIG. According
to the embodiment shown in FIG. 3, the front surface of the diaphragm (la) → capsule case (7) as
shown in the enlarged sectional view of the main part of the embodiment shown in FIG.
Diaphragm (7) → small hole (9) for characteristic correction of concave groove (3a) → back play
(lc) provided in holder (3) → sound surface of rear surface of diaphragm (1a) It will acoustically
couple the front and back of la. Therefore, since a kind of low-pass attenuation filter can be
constituted by the impedance of this acoustic coupling, the frequency echo of the omnidirectional
microphone of the embodiment shown in FIG. The characteristic that the gain in the low region
of about 20 GHz or less is attenuated as shown in the breakdown of FIG. 2b by appropriately
adjusting the size of (3a) and the size of the concave groove (7a) provided in the capsule case (7)
k It can be IIs) 1 · 廣. As described above, according to the embodiment shown in FIG. 3, the
nondirectional microphone operates in the same manner as the conventional example shown in
FIG. 1, and shows a frequency characteristic in which the gain of about 200 HX or less is
attenuated. The vibration noise of the motor can be reduced without using a low-pass noise lowpass equalizer such as wind noise, and in particular, a microphone suitable for use as a built-in
microphone in a tape recorder can be obtained. FIG. 5 shows another embodiment of the
omnidirectional microphone of the present invention. In FIG. 5, parts corresponding to FIG. 1 are
given the same reference numerals. That is, in FIG. 5, a hole (3b) is opened in a part of the holder
(3), and the sound path between the inside and the outside of the holder (3) is obtained.
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Also, a hole (7b) is made in the inner peripheral portion of the capsule case (71 corresponding to
the hole (3b) K provided in the holder (3). Others are configured as in FIG. According to the
embodiment shown in FIG. 5, as shown in the enlarged cross-sectional view of the main part of
the embodiment shown in FIG. 5 of FIG. :). Small holes (9 (→ diaphragm (1 a)) for characteristic
correction of holes (7 b) provided in Y L L screw (7) → holes (3 b) provided in holder (3) k →
pack play (lc) Acoustically couple the curved surface of the diaphragm (1a) and the rear surface
with the sound path of the rear surface. Therefore, since a kind of low-pass attenuation filter can
be configured by the impedance of this acoustic coupling, the frequency characteristic of the
omnidirectional microphone of the embodiment shown in FIG. 5 is provided in the holder (3: hole
(3b)) By appropriately adjusting the size of the hole and the size of the hole (7b) provided in the
capsule case (7) K, the characteristic in which the gain in the low band of about 20 QHz or less as
shown in FIG. Can. As described above, according to the embodiment shown in FIG. 5, the
nondirectional microphone operates in the same manner as the conventional example shown in
FIG. 1, and the same operation and effect as the embodiment shown in FIG. It will be easy to
understand that Similarly, a combination of a recessed groove (3a) provided in a part of one
holder (3) and a capsule case (a hole (7b) provided in the inner peripheral part of 71) and a hole
(3b) provided in a part of the holder (3) (7) The combination of the ball 9 · ball and the groove
(7a) provided from the inner upper portion of the capsule case (7) to the inner side of the capsule
case (7) is similar to the embodiment shown in Figs. An effect can be obtained. Although it is
necessary to provide a static pressure leak path for adjusting the air pressure as a microphone
incorporated in a tape recorder etc., according to the present invention, the holder (31 is
provided with a recessed groove (3a) or a hole (3 The groove (7a) or the hole (7b) provided in
the capsule case (7) k or the capsule case (7) can be commonly used as a static pressure leak
path for air pressure adjustment, and a new static pressure leak path for air pressure adjustment
There is no need to The present invention is not limited to the above-described embodiment, and
it goes without saying that various other configurations can be taken without departing from the
scope of the present invention.
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