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JPH08322096

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH08322096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wind noise preventing microphone in which wind noise, pop noise and the like are reduced.
[0002]
2. Description of the Related Art For example, microphones for communication are often used
outdoors. Therefore, when the wind is strong, the wind noise may impair the clarity of
communication. Also, pop noise from the speaker may also interfere with communication.
Therefore, a wind noise prevention type microphone has been conventionally proposed, and FIG.
9 is one such conventional example.
[0003]
The wind noise reduction type microphone shown in FIG. 9 includes the acoustic resistance
members 10, 11, 12, the spacer 13, and the microphone unit (this specification in this order from
the direction in which the sound enters) inside the front case 1 constituting the microphone. In
the book, this is simply referred to as "MIC unit". ) And 6 are attached. Of the acoustic resistance
members 10, 11, 12, for example, the acoustic resistance member 10 is formed of a non-woven
fabric, the acoustic resistance member 11 is formed of urethane foam, and the acoustic
resistance member 12 is formed of felt. Winding noise and pop noise are reduced by the
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laminated body of the resistance members 10, 11 and 12.
[0004]
FIG. 10 is another conventional example. In this example, the MIC unit 6 and the wind noise
absorbing laminate 14 are disposed inside the front case 1, and the wind noise absorbing
laminate 14 is laminated on the acoustic resistance material 15 and the front and back surfaces
thereof. And the first and second thin plates 16 and 17 made of a non-air-permeable and rigid
material, and the first and second thin plates 16 and 17 Small holes a and b are provided
respectively as far as possible from the central portion, and the small holes a and b are shifted by
90 ° or more around the central axis OO of the first and second thin plates 16 and 17 The first
and second thin plates 16 and 17 are integrally joined to the wind noise absorbing laminate 14
so as to reduce wind noise and the like.
[0005]
However, in the former prior art, only a plurality of sheets of, for example, acoustic resistance
members 10, 11 and 12 different in material are arranged in an overlapping manner, as shown
by A.fwdarw.B in FIG. As the sound travels in a straight line, there is a problem that the wind
noise attenuation effect does not necessarily increase. In addition, since it is necessary to prepare
different kinds of acoustic resistance materials such as non-woven fabric, urethane foam and felt,
many steps are required for production and assembly, which leads to an increase in cost, and
there is also a problem of upsizing.
[0006]
Also, in the latter conventional example, as the wind noise prevention measures, the acoustic
resistance material 15 and the first and second thin plates 16 and 17 are required, the number of
parts is large, and there is also a lamination thickness. Since the positions of the holes a and b
must be shifted to set the first and second thin plates 16 and 17, assembly is complicated, and
there is a limit to the distance to be shifted, and the effect of preventing wind noise etc. There
was a problem that there was a limit.
[0007]
The present invention has been proposed in view of the above-mentioned points, and the object
of the present invention is to reduce the number of parts, to reduce the number of assembling
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steps, and to reduce wind noise as well as to reduce the overall size. It is to provide.
[0008]
SUMMARY OF THE INVENTION The present invention relates to a wind noise reduction type
microphone in which an MIC unit 6 is housed in a cylindrical MIC unit mounting portion 2
formed in a front case 1, said MIC unit mounting portion A narrow ring-shaped sound path 4
with a long road length for noise attenuation is formed in the front case 1 itself 2 and a
substantially ring-shaped spacer 5 having a through hole 5a communicating with the sound path
4 on the top thereof. The above-described object is achieved by providing the MIC unit 6 through
the same.
[0009]
Further, a substantially disc-like sound having a through hole 1b formed in the front case 1
portion where the MIC unit mounting portion 2 is provided, and having a narrow bent groovelike sound path 4 with a long road length for noise attenuation above it The above object is
achieved by disposing the road attachment 8 and providing the MIC unit 6 through the
substantially ring-shaped spacer 9 having the through hole 9a communicating with the sound
path 4 above the road attachment 8. There is.
[0010]
Further, the sound path 4 extends toward the through hole 4a at the end of the through hole 4a
formed in the outer peripheral portion, the narrow groove-like bent portion 4b communicating
with the through hole 4a, and the bent portion 4b. And a circular hole 4c located approximately
at the center of the substantially circular MIC unit mounting portion 2 so as to form a threedimensional substantially loop shape.
[0011]
According to the first aspect of the present invention, since the front case 1 itself is provided with
the sound path 4 for preventing wind noise and pop noise, other special parts for noise
component attenuation incorporated in the front case 1 are omitted. Therefore, only the spacer 5
is sufficient, and the number of parts can be significantly reduced.
Further, as described above, since the number of parts to be stacked is small, the size can be
reduced accordingly.
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[0012]
According to the second aspect of the present invention, the disk-shaped attachment 8 for the
sound path having the bent sound path 4 is used, but only the attachment 8 for the sound path
and the spacer 9 are used as main members for noise prevention. After all there are few parts.
[0013]
In addition, a curved narrow groove-like sound path is provided, the distance from the sound
inlet to the MIC unit is increased, and wind noise is attenuated.
[0014]
Moreover, the thing of Claim 2 can utilize the conventional front case 1, and also has versatility
in that sense.
[0015]
1 to 5 show a first embodiment of the present invention.
Among these, FIG. 1 is a plan view of a part of the front case 1, and FIG. 2 is a cross-sectional
view taken along the line AA in FIG.
[0016]
A cylindrical MIC unit mounting portion 2 is integrally formed on the upper surface of the front
case 1.
[0017]
In the portion of the front case 1 itself in the cylindrical portion 3, an elongated through hole 4a
for introducing sound from the outside is formed on the outer peripheral side of the cylindrical
portion.
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In the illustrated state, as shown in FIG. 1, a narrow groove-like sound path 4 bent substantially
in a loop shape is formed on the upper surface.
[0018]
The sound path 4 communicates with the through hole 4a and the upper portion of the through
hole 4a and extends along the outer periphery of the upper surface of the cylinder 3 along the
outer periphery thereof, and the narrow groove 4b. And a circular hole 4c located substantially at
the center in the substantially circular MIC unit mounting portion 2 extending in a substantially
straight line toward the through hole 4a.
Then, the sound entering from the through hole 4a is transmitted in a substantially loop shape
toward the hole 4c as shown in FIG. 3, and wind noise and the like are attenuated in this process.
[0019]
FIG. 4 is an exploded perspective view of components of the microphone.
Reference numeral 5 denotes a substantially ring-shaped spacer, which has a through hole 5a
functioning as the sound path 4 in the center, and is accommodated in the MIC unit mounting
portion 2.
The through hole 5a and the hole 4c at the end point of the sound path 4 on the front case 1 side
communicate with each other at a corresponding position, and the other through holes 4a, the
bending portion 4b, etc. are closed by the spacer 5 Be
Further, an MIC unit 6 having a known structure is stacked and fixed above the spacer 5 made of
an elastic material or a rigid body having no air permeability.
[0020]
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Thus, the sound on the outside of the front case 1 is substantially looped through the passage
composed of the through hole 4a, the bent portion 4b, the hole 4c at the central portion, the
through hole 5a of the spacer 5, etc. Enter MIC unit 6
Thus, the sound path 4 has its path length increased, so wind noise and pop noise can be
effectively reduced.
[0021]
6 to 8 show a second embodiment of the present invention.
In this example, a through hole 1b is drilled at the center of the MIC unit mounting portion 2 of
the front case 1, and a circular thin film-like waterproof sheet 7 is housed in the MIC unit
mounting portion 2, It is a type. The waterproof sheet 7 is made of a waterproof and breathable
material. The dashed line in the waterproof sheet 7 indicates that an adhesive such as a doublesided tape for adhering to the front case 1 is applied, but the waterproof sheet 7 may be omitted
depending on the application.
[0022]
Reference numeral 8 denotes a disk-like attachment for a sound path, and a through hole 4a is
formed on the outer peripheral portion, and a narrow groove-like bending portion 4b
communicating with the through hole 4a is provided on the upper surface. A sound path
attachment 8 refracted toward 4 c and having the sound path 4 is laminated on the waterproof
sheet 7.
[0023]
Then, a substantially ring-shaped spacer 9 having a through hole 9a communicating with the
hole 4c of the sound path 4 is laminated on top of that and a MIC unit 6 is sequentially stacked.
[0024]
FIG. 7 is a perspective view of the lower surface side in which the sound path attachment 8
shown in FIG. 6 is reversed.
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A raised flange-like cylindrical portion 8a is formed on the outer periphery of the attachment 8
for sound path, and the sound entered from the through hole 1b at the center of the front case 1
is introduced into the through hole 4a of the attachment 8 for sound path It is configured to be
able to
[0025]
FIG. 8 shows a longitudinal sectional view of the assembled state.
The sound coming from the through hole 1b of the front case 1 passes through the through hole
4a of the attachment 8 for the sound path, the bent portion 4b, the central hole 4c, the through
hole 9a of the spacer 9, etc. 6 and is configured to attenuate noise in the process.
[0026]
In the above embodiments, the sound path 4 is formed in a substantially loop-like threedimensional structure in the front case 1 itself or the attachment 8 for the sound path, but the
present invention is not necessarily limited to that shape, and a desired sound If a characteristic
is obtained, it may be a U-like shape. Also, for example, it may be meandering. The point is that in
order to form a three-dimensional bent shape, it is only necessary to increase the path length of
the groove, and thus to obtain desired acoustic characteristics and effectively attenuate noise.
[0027]
As described above, according to the first aspect of the present invention, since the narrow
groove-like sound path 4 having a long road length for noise attenuation is formed in the front
case 1 itself, the number of parts is reduced, Furthermore, in spite of the small number of parts,
noise can be effectively prevented from entering the MIC unit 6, and since the number of parts is
small, the number of assembling steps can be reduced and the size can be reduced.
[0028]
Even in the second aspect of the invention, the noise reduction parts can reduce the number of
parts and the number of assembling steps because the disk-shaped sound path attachment 8
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having the sound paths 4 and the spacer 9 are two points. And miniaturization can be achieved.
[0029]
Further, since the sound path 4 has a narrow groove shape and a long path length, noise can be
effectively prevented.
[0030]
Brief description of the drawings
[0031]
1 is a plan view of a portion of the front case of the first embodiment of the present invention.
[0032]
2 is a cross-sectional view taken along the line AA of FIG.
[0033]
Explanatory drawing of the path | route which goes through the sound path.
[0034]
4 is an exploded perspective view of each component of the microphone of the first embodiment
of the present invention.
[0035]
5 is a longitudinal sectional view of the assembled state of the same.
[0036]
6 is an exploded perspective view of a second embodiment of the present invention.
[0037]
7 is a perspective view of the sound path attachment used in the same.
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[0038]
8 is a longitudinal sectional view of the assembled state.
[0039]
FIG. 9 is a longitudinal sectional view of a conventional example.
[0040]
10 is a longitudinal sectional view of another conventional example.
[0041]
Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 1 front case 1a through-hole 2 MIC unit attachment part 3
cylindrical part 4 sound path 4a through-hole 4b bending part 4c hole 5 spacer 5a through-hole
6 MIC unit 7 tarpaulin 8 sound path attachment 9 spacer 9a through-hole
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