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DESCRIPTION JPH071683

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DESCRIPTION JPH071683
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low sensitivity adjustment mechanism of a microphone which is equipped with a dynamic hand
microphone and which mechanically and continuously adjusts the low sensitivity of the
microphone at hand.
[0002]
2. Description of the Related Art In a dynamic hand microphone, a back room is provided at the
back of a microphone unit for low-pass compensation. This back room improves the low range
sensitivity. However, low-pass sensitivity adjustments can not be made. The adjustment of low
sensitivity is conventionally performed electrically on the side of the amplifier.
[0003]
In such a hand microphone, low-pass sensitivity can not be adjusted unless a person holding the
microphone moves to the side of the amplifier. Otherwise, another person needs to operate the
amplifier. In any case, the disadvantage of not being able to adjust low-pass sensitivity at hand is
significant.
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1
[0004]
The present invention has been made in view of the above circumstances, and it is an object of
the present invention to provide a microphone low sensitivity adjustment mechanism capable of
continuously adjusting the low sensitivity at the hand of the microphone and having a simple
structure and economy. With the goal.
[0005]
SUMMARY OF THE INVENTION The low frequency sensitivity adjustment mechanism of the
microphone according to the present invention is provided in the microphone body to form a
back chamber behind the microphone unit attached to the tip of the microphone body, The lowfrequency compensation member is an expansion and contraction unit that extends and contracts
in the axial direction so as to change the volume of the back chamber, and a portion behind the
microphone unit is incorporated in the microphone body and operated from outside the body
And an operation mechanism for extending and retracting the shaft in the axial direction.
[0006]
By operating the operating mechanism incorporated in the microphone body, the expansion and
contraction portion of the low-frequency compensation member is expanded and contracted in
the axial direction.
When the stretchable portion is extended, the volume of the back chamber is increased and the
low sensitivity is improved.
On the other hand, when the expansion and contraction portion shrinks, the volume of the back
chamber decreases and the low sensitivity lowers. Thus, the low sensitivity of the microphone is
mechanically and continuously at hand
[0007]
Embodiments of the present invention will now be described with reference to the drawings. FIG.
1 is a longitudinal sectional view of a microphone showing one example of the low range
sensitivity adjustment mechanism of the present invention, FIG. 2 is a sectional view taken along
line AA of FIG. 1 and FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a longitudinal
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2
sectional view of the microphone for explaining the operation of the low band sensitivity
adjustment mechanism.
[0008]
The microphone unit 10 is attached to the tip of a cylindrical microphone body 20 via a
cylindrical attachment sleeve 30, and is protected by a cover 40 also attached to the tip of the
microphone body 20. A pair of slits 21 and 21 opened at an angle of about 90 ° in the
circumferential direction are provided symmetrically on the tip of the microphone body 20 with
the central axis of the microphone body 20 interposed therebetween (FIGS. 2 and 3) 4).
[0009]
The low band compensation member 50 for improving the low band sensitivity of the
microphone unit 10 is formed of a cylindrical bag made of an elastic material such as rubber. The
bag body is provided in a portion from inside the mounting sleeve 30 to inside the tip end
portion of the microphone body 20, and forms a back chamber 51 at the rear of the microphone
unit 10.
[0010]
The rear portion of the low-frequency compensation member 50 which forms the back chamber
51 is a bellows-like stretchable portion 52 which is accommodated in the distal end portion of
the microphone body 20 and which is stretchable in the axial direction. Also, the front portion is
gripped between the rear of the microphone unit 10 and the mounting sleeve 30 to hold the bag.
[0011]
A cylindrical operation sleeve 60 is fitted in the end of the microphone body 20. The operation
sleeve 60 surrounds the bellows-like expansion and contraction portion 52, and is free in the
circumferential direction.
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[0012]
On the outer surface of the upper end portion of the operation sleeve 60, a pair of operation
portions 61, 61 projecting to the outer peripheral side are provided symmetrically about the
central axis. The operation units 61 and 61 are inserted into the slits 21 and 21 formed in the
upper end portion of the microphone body 20 so that the tip end surfaces thereof are exposed to
the outside of the microphone body 20. The slits 21, 21 are formed at an angle of about 90 ° in
the circumferential direction of the microphone body 20 as shown in FIG. Therefore, the
operation sleeve 60 can rotate in both forward and reverse directions at an angle of about 90 °
by the operation from the outside of the microphone body 20.
[0013]
Buffer materials 62 and 62 are attached to the upper and lower surfaces of the operation portion
61 to reduce sliding noise.
[0014]
On the inner surface of the operation sleeve 60, as shown in FIG. 3, a pair of guide portions 63,
63 consisting of recessed grooves are provided symmetrically about the central axis of the
operation sleeve 60. As shown in FIG.
As described above, the guide portions 63, 63 are helically inclined at an angle of about 30 °
with respect to a plane perpendicular to the central axis of the operation sleeve 60 (see FIG. 4).
[0015]
Inside the operation sleeve 60, a circular movable plate 70 perpendicular to its central axis is
accommodated. The movable plate 70 is bonded to the bottom surface of the bag constituting the
low range compensation member 50, and moves in the central axis direction of the operation
sleeve 60 but does not rotate in the circumferential direction.
[0016]
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A pair of projections 71, 71 are formed on the outer peripheral surface of the movable plate 70.
The projections 71 and 71 are fitted in a pair of guide portions 63 and 63 provided on the inner
surface of the operation sleeve 60 so as to be able to move freely. Therefore, when the operation
sleeve 60 rotates in the tip of the microphone body 20, the projections 71, 71 of the nonrotatable movable plate 70 are guided by the guide portions 63, 63, and the movable plate 70 is
linearly moved in the axial direction of the operation sleeve 60
[0017]
In such a microphone, by pinching the operation portions 61 and 61 of the operation sleeve 60
from the outside of the microphone body 20 and moving it in the circumferential direction of the
operation sleeve 60, the operation sleeve 60 is about 90 °. It can be rotated in both forward and
reverse directions in the range of. When the operation sleeve 60 is rotated in one direction, the
movable plate 70 in the operation sleeve 60 moves to the front end side (or the rear end side) of
the microphone body 20 and is rotated in the other direction. Moves to the rear end side (or the
front end side) of the microphone body 20.
[0018]
When the movable plate 70 moves to the tip end side of the microphone body 20, the expansion
/ contraction portion 52 of the low-frequency compensation member 50 is contracted in the
axial direction, and the volume of the back chamber 51 decreases, so the low-frequency
sensitivity decreases. . When the movable plate 70 moves to the rear end side of the microphone
body 20, the expandable portion 52 of the low-frequency compensation member 50 extends in
the axial direction, and the volume of the back chamber 51 increases, so the low-frequency
sensitivity improves. That is, by the rotational operation of the operation sleeve 60, the low range
sensitivity is mechanically and continuously adjusted at hand.
[0019]
The operating mechanism of the low range sensitivity adjusting mechanism is composed of the
operating sleeve 60 and the movable plate 70 in this embodiment, but the expansion and
contraction part 52 of the low range compensating member 50 is made axial from the outside of
the microphone body 20 The configuration is not limited as long as it can be expanded and
contracted.
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[0020]
As described above, the low-pass sensitivity adjustment mechanism of the microphone according
to the present invention is directly attached to the microphone and mechanically and
continuously adjusts its low-pass sensitivity at hand. The effect is to significantly enhance the
usability of the microphone.
In addition, the low range sensitivity adjustment mechanism is mechanical and is extremely
economical because it has a simple structure using the low range compensation member of the
microphone unit.
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