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DESCRIPTION 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, a wire cover, 2 a wire winding car, 3 a plugin, 4 an earphone, 5 a wire, 6 a groove, 7 an earphone stopper, 8 a hole.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention makes an
omnidirectional microphone Kll suitable for use as a built-in microphone such as a tape recorder.
As a conventional omnidirectional microphone, the one shown in Fig. 1 + 11 contradictory b) is
proposed. That is, in FIG. 1, a diaphragm (1a) having a microphone capsule (11) having a
microphone capsule (11 is a vibrating membrane 12 made of duralumin, titanium, plastic or the
like) and a diaphragm And a t back plate (IC) disposed correspondingly with a predetermined
interval therebetween via spacers (lb). In addition, (3 (represents a cylindrical holder formed of
synthetic resin or the like, and fixes the above-described i-cup capsule (1) to this holder (31).
Also, an input terminal (5a) K of the head amplifier (5) is connected via a contactor (41) which
electrically connects the back plate (IC), and from this head amplifier (51) a ground terminal (5b)
and an output terminal ). Also, by using the head amplifier (51 ground terminal (5b) and output
extender (5C)), make rubber paddle + 61 screws and set the rubber paddle (6) inside Kljl of the
holder (3) Fix inside the holder (3) IBK securely. (2) -V1 voice), "" 'le; 〃 Also, the abovementioned integrated microphone capsule (1) and holder (3) are collected in a cylindrical capsule
case f71, Lid with the case (71 bottom grip earth plate (8: with lid). In this case, the terminal (8a)
of the earth plate (8) is connected to the ground terminal (5b) of the head amplifier (51). In FIG.
1, (9 ν is a small hole for characteristic correction. Since the omni-directional microphone
shown in FIG. 1 is configured as described above, when the sound pressure of the motion film (2)
K of this microphone is applied, the vibration film (2) vibrates, so the vibration film (2 ) And pack
play) (IC) varies, so the amount of electric charge stored in the capacitor composed of the
diaphragm (2) and the pack plate (1 c) increases with K It is possible to obtain an output voltage
corresponding to the amount of increase / decrease of the charge, that is, an output voltage
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corresponding to the sound pressure, than the output terminal (5 C) of the head amplifier (5) To
operate. However, such a frequency characteristic of the omni-directional microphone as shown
in FIG. 1 shows the frequency characteristic (3) as shown by the solid line a in FIG. 2), and it is
used as wind noise and, for example, 1 built-in microphone of a tape recorder In this case, lowrange noise such as vibration noise of the motor is picked up with high gain. Therefore, at the
time of recording, wind noise and vibration noise of the motor are recorded together with the
main signal with high gain, and such noise Since it is played back with the main signal, there is a
disadvantage that the main signal becomes difficult to hear due to the influence of noise, giving
the audience an unpleasant feeling.
In view of the above, the present invention has a simple configuration in which the
characteristics of the omnidirectional microphone are such that the low range of approximately
200 Hz or less as shown in FIG. 2B is attenuated, and the wind noise And to mitigate the lowfrequency noise of questioning the silky motion noise of the motor. DETAILED DESCRIPTION OF
THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the omnidirectional microphone
according to the present invention will be described with reference to FIG. 3, in which parts
corresponding to those in FIG. 1 are denoted by the same reference numerals and detailed
description thereof is omitted . That is, in this example, a recessed groove (3a) is provided in a
part of the holder (31). In addition, a recessed groove (7a) is similarly provided from the inner
upper portion to the side portion of the capsule case (7) corresponding to the position of the
recessed groove (41 kiln '5' (3a) In this case, the width of the recessed grooves (3a) and (7a)
provided in the holder (3) and the capsule case (7) K is set to 0.5 m, for example. Other
configurations are the same as in Fig. 3, as shown in the enlarged sectional view of the essential
part of the embodiment shown in FIG. 4 of FIG. 4, the front side of the diaphragm (la) → the
capsule case (7) (9) for characteristic correction of the concave groove (7a) provided in the
holder (3) → concave groove (3a) provided in the holder (3) → back play) (lc) → the diaphragm ]
La will acoustically couple the front and back faces. Therefore, since it is possible to construct a
type of low-frequency attenuation filter by the impedance of this acoustic coupling, the frequency
resonance of the omnidirectional microphone of the embodiment shown in FIG. 3 can be
expressed as (3 a) and the size of the recessed groove (7 a) provided in the capsule case (7) k are
properly adjusted, characteristics of the gain in the low range of about 20 GHz or less as shown
in FIG. 2B are attenuated You can and IIs) 1 · broaden. As described above, according to the
embodiment shown in FIG. 3, the non-directional microphone operates in the same manner as
the conventional example shown in FIG. 1 and shows the frequency characteristic of attenuating
the gain of about 200 HX or less , It can be alleviated without using a low-frequency cut
equalizer such as noise of low frequency noise such as wind noise in the motor noise, and it is
possible to obtain one suitable for use as a microphone built in a tape recorder or the like, in
particular. Also, FIG. 5 shows another embodiment of the omnidirectional microphone of the
present invention. In FIG. 5, parts corresponding to those in FIG. 1 are denoted by the same
reference numerals. That is, in FIG. 5, a hole (3 b) is opened in a part of the holder (3), and the
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sound path is formed between the inside and the outside of the holder (3).
Also, a hole (7b) is opened in the inner peripheral portion of the capsule case (71) corresponding
to the hole (3b) K provided in the holder (3). Other configurations are the same as in Fig.
According to the embodiment shown in FIG. 5, as shown in the enlarged sectional view of the
main part of the embodiment shown in FIG. 5 of FIG. 6, the front face of the diaphragm (1a) :).
Small hole (9 (→ diaphragm (1a)) for characteristic correction of (1c) hole (7b) → holder (3) k
provided hole (3b) → pack play) (lc) , The acoustic coupling is made between the curved surface
of the diaphragm (1a) and the rear surface with the sound path of the rear surface of the
diaphragm (1a). Therefore, since it is possible to constitute a kind of low-frequency attenuation
filter by the impedance of this acoustic coupling, the frequency characteristic of the nondirectional microphone of the embodiment shown in FIG. 5 can be obtained by changing the
frequency characteristic of the omnidirectional microphone in the holder (3: And the size of the
hole (7 b) provided in the capsule case (7) K is appropriately adjusted so that the gain in the low
range of approximately 20 QHz or less as shown in FIG. 2B is attenuated You can do. As
described above, according to the embodiment shown in FIG. 5 as well, it operates similarly to
the conventional example shown in FIG. 1 as the omnidirectional microphone, and also has the
same operation and effect as the embodiment shown in FIG. 3 It will be easy to understand how
to get it. Similarly, a combination of a recessed groove (3a) provided in a part of the holder (3)
and a hole (7b) provided in the inner peripheral portion of the capsule case (71) and a hole (3b)
provided in a part of the holder (3) (7) 皐; Ball 9 · Moxibustion and the concave groove (7a)
which is provided by busy Confucius from the inside upper part of the capsule case (7), as in the
embodiment shown in Fig. 3 and Fig. 5 An operation effect can be obtained. As a microphone
incorporated in a tape recorder or the like, it is necessary to provide a static pressure leakage
path for atmospheric pressure adjustment. However, according to the present invention, since
the holder (31 is provided with a recessed groove (3a) or hole 3b) and the capsule case (7) k can
be commonly used as a static pressure leakage path for atmospheric pressure adjustment, and it
is also possible to newly use a static pressure leakage path for atmospheric pressure adjustment
Need not be provided. It is to be understood that the present invention is not limited to the
above-described embodiments, and that various other configurations can be adopted without
departing from the gist of the present invention.
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