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JPS5768990

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DESCRIPTION JPS5768990
Description 1, title of the invention
Reverberation amount variable type microphone device
3. Detailed Description of the Invention The present invention relates to a microphone device
capable of varying the amount of reverberation. FIG. 1 shows a conventional variable
reverberation type microphone device. In the same figure (,), 11 is a dynamic microphone unit,
12 // 'i its diaphragm, 1s, 14. xsFi is a foam elastic body provided in the case 1617, 18 is a
mover, and 19.20 are a diaphragm and a coil seal that constitute a reverberation device provided
in the case 21, respectively. The diaphragm 19 and the diaphragm 12 are acoustically connected
through a through hole provided in the case 16.17, the elastic body 14, and the mover I8. In
such a configuration, the bubble density of the elastic body is increased by driving the mover 18
in the directions of the arrows A and B in the figure, and the diaphragms 12 ° 19 are
acoustically opened and shut off to adjust the reverberation amount. I will be an officer. On the
other hand, in the same figure (b), 23 is provided in the case 24 having a plurality of through
holes or in the case of direct acoustic example 1, for example, a microphone unit consisting of
electrets, 25 and 26.27 have their respective cases 28 A peristaltic plate and a coil spring which
constitute a reverberation device provided in the above, and a microphone unit 29 made of, for
example, an electret for reverberation sound provided in a case 28 are provided. The output
signal of this microphone unit 29.23 is supplied to the mixing circuit 30, and the reverberation
amount is adjusted. EndPage: In the case of the microphone with the configuration shown in FIG.
1 (&), the sound quality does not matter so much, but the sound pressure in the low band (150
Hz to 1.5 kHz) of the diaphragm 19 is very small and reverberation occurs. It has the drawback
of being difficult. Also, in the case of FIG. 6B, although sufficient reverberation can be obtained,
the direct sound obtained by the mid microphone unit 23 of the reverberation obtained by the
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microphone unit 29 is synthesized, and the defect weight is not good. doing. The present
invention has been made based on the above-mentioned circumstances, and the reverberation
amount can be varied favorably, and the reverberation sound in the low range can be sufficiently
obtained, and the remnant is also very good. Try to provide Hereinafter, an embodiment of the
present invention will be described with reference to the drawings. In FIGS. 2 (a) and 2 (b), for
example, 3 is a bottomed cylindrical first casing, and a flange portion 32 is provided on the
periphery of the opening of the casing 3 '. A diaphragm 33 constituting a reverberation device is
provided in the opening of the housing 31, and an elastic member, for example, a coil spring 34
is provided between the diaphragm 33 and the bottom surface of the tube 31.
In addition, a second casing 35 is slidably provided at the opening of the housing 3 by rotating
the opening. The inside of the casing 35 is partitioned in the sliding direction by the partition
wall 36, and a reverberation chamber 37 having a large volume and a sound collecting chamber
38 having a small volume are formed. A through hole 39 is provided on the surface of the
convergence chamber 38 facing the diaphragm 33, and an intermediate portion between the
through hole 39 and the μmf partition 36 opposes one microphone unit, 40i) Z vibration knit
33. It is provided in the direction to A through hole 4 is provided on the surface of the
reverberation chamber 37 facing the diaphragm 33 which is sweet. The surface on which the
through hole 4 is formed protrudes from the surface on which the through hole 39 is formed,
and the opening area of the sound collecting chamber 38 is smaller than that of the flange
portion 32. In the above configuration, as shown in FIG. 2 (,), when the reverberation chamber 37
and the sound collection chamber 38 are opposed to the diaphragm 33, the microphone unit 40
is shown as a dotted line of the sound wave entering through the through hole 39. When the
sound wave from the through hole 4 enters the microphone unit 40 directly as shown by the
dotted line, the diaphragm 33 is driven to 4. While entering the microphone unit 40 as a sound
wave σ-sequence echo component generated by the drive plate 33, the diaphragm 33 is driven.
On the other hand, when the housing 35 is slid in the direction ly1 indicated by the arrow C in
the above state, the opening of the sound collecting chamber 38 is gradually closed by the collar
32. Therefore, the reverberation component entering the sound collecting chamber 38 along
with the time h gradually decreases. Then, when the opening of the sound collection chamber 38
is completely closed by the hook portion 32 as shown in FIG. 6B, only the sound wave from the
through hole 39 indicated by HAM enters the microphone unit 40. As described above, according
to the embodiment described above, the amount of reverberation is adjusted by sliding the casing
35 relative to the casing 3 and changing the opening area of the sound collection chamber 38. In
addition, a reverberation chamber '37 with a large volume is provided in front of the diaphragm
33. Therefore, it is easy to change the reverberation amount, and furthermore, the sound
pressure of the low frequency component of the reverberation is increased, and the sound
quality is also improved. Further, each axis of the sound collecting chamber 38 is smaller than
the capacity of the reverberation chamber 37. したがって1. Since the reverberation in the
sound collection room is small, it is possible to prevent the inferiority of the direct sound due to
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the reason that the reverberation as shown in 2 ν + (b) is not added. Next, it will be described as
for another example #i of the present invention. The same parts as bamboo j and FIG. 2 are
assigned IL · − symbols, and only different parts will be described. In FIG. 3 (-) (b), reference
numeral 5 denotes a second housing provided in sliding contact with the i-shaped body 3 of the
crucible 1.
A through hole 52 smaller in the scraped "" surface 9 than in the sliding force direction one end
KN portion 32 is provided on the surface of the housing 5 'facing the diaphragm 33. Further, a
through hole 39 is provided at the center of the upper surface of the housing 5 'in the figure, and
the microphone unit 40 is attached to the inside of the housing 5' in the vicinity of this 瀉 -Pt3 '.
In such a configuration, in the state of EndPage: 2 shown in FIG. 1 (&), the sound wave entering
the housing 51 through the through hole 39 directly enters the eyelid phone unit 40 as shown
by the dotted line and The diaphragm 33 is driven through 52. The sound wave generated by the
diaphragm 33 enters the micro-on unit 40 as a reverberation component, and further drives the
diaphragm 33. On the other hand, when the case 5 is slid in the direction of the arrow in the
figure from the above state, the through hole 52 is gradually closed, and along with this, the
reverberation component entering the case 51 gradually decreases. Then, when the through hole
52 is completely closed by the flange portion 32 as shown in FIG. 7B, only the sound wave from
the through hole 39 shown by the dotted line enters the microphone unit 40. FIGS. 4 (a) and 4
(b) and 5 (a) and 5 (b) further show another embodiment of the present invention, and FIGS. 5 (a)
and 5 (b) show FIGS. ) (B) is a top view. The difference from FIG. 2 (,) (b) is that the center of the
collar portion 62 spoofed in the first housing 61 is separated from the center of the housing 6.
The second housing 63 is a pair of the collar portion 62 (the point is rotatably provided. In the
above configuration, in the state shown in FIG. 4 (a) and FIG. 5 (.), The sound wave from the
through holes 39 and 41 directly enters the microphone unit 40 as in FIG. 2 (.). Drive 33 The
reverberation component generated by the diaphragm 33 enters the microphone-6 phone unit
40 and further drives the diaphragm 33. On the other hand, when the casing 63 is rotated in the
above state, the opening th product of the sound collection unit 38 gradually decreases. The
amount of reverberation that enters the microphone unit 40 along with the reduction also
decreases, and the case 63 is rotated 180 ° as shown in FIG. 4 (b) and the fifth frame 1 (b). The
part is completely closed, and the microphone unit 40 receives sound waves only from the
through holes 39. FIG. 6 further shows another embodiment of the present invention. The second
case 72 is rotated relative to the first case 7 of FIGS. 4 and 5 and the first case 7 is different from
FIGS. 4 and 5 in that the diaphragm 33 is different from the first case. The through holes 39 and
the My "crophone unit 40" are disposed along the direction of rotation of the second housing 72
and are the tail points.
In addition, 73, 74 (d buttocks, 75 is sweet for rotation operation. In the above configuration, in
the state shown in FIG. The sound waves from the through hole 39 ° 4 and the reverberation
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components generated from the diaphragm 33 enter the microphone unit 41 while facing the
through holes 39 and 41 and the diaphragm 33. In this state, when the second housing 72 is
rotated in the direction of the arrow E, the opening area of the sound collecting chamber 38 (not
shown) gradually decreases, and the reverberation component entering the microphone unit 40
decreases. Then, as shown in FIG. 6B, the sound collection chamber 38 is completely closed in a
state where the casing 72 is rotated by 90 °, and only the sound waves from the through holes
39 enter the micro-on unit 40. That is, in this embodiment g11, the operating state of the
microphone can be changed by rotating the case 72 by 90 °. As described above in detail,
according to the present invention (according to the invention, a reverberation amount in a low
range can be obtained 1-1, and a reverberation sound in a low range can be sufficiently obtained,
and a reverberation variable type microphone device with extremely good sound quality is
provided. it can.
4. Brief description of the drawings Drive 11 (()) (b) shows a different reverberant partial variable
microphone device according to the present invention. An embodiment of a variable
reverberation amount type microphone device according to the present invention, the f'1. FIGS. 3
(a) and 3 (b) show another embodiment of the present invention and are different from each
other. b) shows still another embodiment of the present invention, which is a side sectional view
showing different operation states according to the respective forces, and FIGS. 5 (a) and 5 (b)
correspond to FIGS. 41 (a) and (b), respectively. 6 is an exploded view of the application of the
invention according to the present invention; FIG. 7 (,) (b) is a force, an upper surface showing
different operating conditions of FIG. FIG. 3.1, 61.71 ... 1st. Housing, 33 ... diaphragm, 34 ... coil
spring, '35 .51. EndPage: 363.72 · · · second housing, 39.41 · · · through hole, 40 · · · microphone
unit. Dispatch agent Attorney Attorney Takehiko Suzue EndPage: 4 years' 3 (a) years 4 (a) (b)
Figure (b) (a) Fang 5 Ao 6 Figure (b) Fang 7 Figure (a) EndPage: 5
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