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JP2008219588

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DESCRIPTION JP2008219588
An object of the present invention is to provide a microphone unit in which an acoustic
resistance material can be disposed without changing a predetermined acoustic resistance value
set in advance. In a microphone unit 11 including at least an acoustic resistance member 52 for
closing a communication hole 47 provided in an insulation seat 42, the insulation seat 42 has a
large diameter recess in communication with the communication hole 47 on at least one side
thereof. And a small diameter recessed portion 45 which is continuous with the large diameter
recessed portion 44 with a step, and the small diameter recessed portion 45 has an outer back
bottom portion 46 a whose back bottom 46 is partitioned by an annular projection portion 48
and In the inner deep bottom portion 46b, the acoustic resistance member 52 is disposed, and in
the normal state, the elastic member 53 having a seat height higher than that of the annular
projection portion 48 is disposed, and the small diameter recessed portion In the portion 44, the
support member 55 supported via the annular projection 48 is disposed so as to freely press the
elastic member 53. [Selected figure] Figure 1
マイクロホンユニット
[0001]
The present invention relates to a microphone unit in which an acoustic resistance material can
be disposed without changing a predetermined acoustic resistance value.
[0002]
Among the microphone units, there are some microphone units in which an acoustic resistance
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material is disposed in the sound passage so that the directivity can be controlled by adjusting
the sound wave entering from the side or the back.
In this case, as the acoustic resistance material, an appropriate material according to the desired
purpose is selectively used, such as a thin sheet such as a woven fabric, a non-woven fabric or a
nylon mesh, or a sponge having a large thickness. There is.
[0003]
Among them, the acoustic resistance material formed in the form of a sheet is generally disposed
by using a double-sided tape, an adhesive or the like so as to cover the opening on a supporting
member provided with an opening for sound communication. It is done.
[0004]
However, in the case of using an adhesive or a double-sided tape, the adhesive component may
penetrate into the mesh of the sheet-like acoustic resistance material to change the acoustic
resistance value.
For this reason, adjustment of an acoustic resistance value and an aging process were required
about each microphone unit.
[0005]
On the other hand, among the microphone units, for the purpose of making such adjustment of
the acoustic resistance value and the aging process unnecessary, for example, as disclosed in
Patent Document 1 below, an acoustic resistance material is used without using a double-sided
tape or an adhesive. It has already been proposed to mechanically clamp the support to the
support member. Japanese Utility Model Application Publication 7-29996
[0006]
FIG. 3 is a longitudinal sectional view of the acoustic transducer (microphone unit) disclosed in
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Patent Document 1 above. According to the figure, in the condenser type microphone unit 1
having a cylindrical outer shape, the sheet-like acoustic resistance material 4 exhibiting a circular
shape is disposed in the air chamber 3 secured on the back side of the back electrode plate 2 It is
formed.
[0007]
The acoustic resistance material 4 is formed by using a nylon mesh sheet, and functions as a
sound passage 9 in a state of being integrally laminated with the sponge material 5 having both
elasticity and air permeability. , 9 are separately held between the one side supporting member 6
and the other side supporting member 7 provided separately.
[0008]
In this case, the one side support member 6 positioned on the side of the capacitor portion is
hooked to the step 2 a provided on the inner peripheral surface of the back electrode plate 2
defining the air chamber 3.
The other side support member 7 in contact with the sponge member 5 is supported by a ring
member 8 screwed to the inner peripheral surface of the back electrode plate 2. As a result, the
acoustic resistance material 4 and the sponge material 5 are integrally sandwiched and fixed
between the one side support member 6 and the other side support member 7.
[0009]
Further, the ring member 8 can be strongly compressed in contact with the other side support
member 7 of the sponge member 5 by screwing and tightening the ring member 8 and pressing
the sponge member 5 side. As described above, the acoustic resistance member 4 integrated with
the sponge member 5 can be elastically brought into close contact with the one side support
member 6 as a result of being provided with elasticity. As a result, no air leakage occurs and the
fixed acoustic resistance value is fixed without changing.
[0010]
In this way, as for each microphone unit 1 to which the acoustic resistance material 4 is fixed, as
a result of no variation in the acoustic resistance value among the individual, the performance
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such as directional frequency characteristics and sensitivity can be stabilized and mass
production can be performed .
[0011]
By the way, according to the microphone unit 1 shown in FIG. 3, the sheet-like acoustic
resistance material 4 can be disposed without changing the acoustic resistance value.
However, since the sponge material 5 integrated with the acoustic resistance material 4 itself has
an acoustic resistance function and the acoustic resistance value changes according to the degree
of compression, it takes time and effort for the adjustment operation. There was a disadvantage
of having to
[0012]
Furthermore, the one side support member 6 must be separately added and disposed together
with the other side support member 7 unlike the component members that the microphone unit
1 is required to have. For this reason, the microphone unit 1 has a large number of members, and
the structure is complicated, which makes it difficult to arrange two or more acoustic resistance
members 4.
[0013]
SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention
has an object to provide a microphone unit in which a sheet-like acoustic resistance material can
be disposed without changing a predetermined acoustic resistance value set in advance. is there.
[0014]
The present invention has been made to achieve the above object, and in the microphone unit
comprising at least an acoustic resistance material for closing the communication hole provided
in the insulating seat, the insulating seat is at least connected to one side thereof A large
diameter recessed portion communicated with the hole, and a small diameter recessed portion
continuous with the large diameter recessed portion with a step, the small diameter recessed
portion having an outer bottom portion separated by an annular protrusion at the back bottom
portion And an inner deep bottom portion, in which the elastic resistance material is disposed in
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the inner deep bottom portion, and an elastic member having a seat height higher than that of
the annular projection portion in normal state is disposed, and in the small diameter recessed
portion A main feature is that a support member supported via the annular projection is disposed
so as to freely press the elastic member.
[0015]
In this case, a capacitor section composed of a support ring on which the diaphragm is stretched
and a back electrode plate disposed opposite to the diaphragm with a predetermined gap
interposed therebetween is provided on both sides of the insulating seat. It is preferable to set it
as a double-sided facing type which is separately disposed.
[0016]
According to the first aspect of the present invention, since the acoustic resistance material can
be disposed without using the adhesive, the acoustic component is caused by the infiltration of
the adhesive component or the leakage of air along the contact surface with the support member.
The through hole can be covered without causing a change in resistance value.
For this reason, each microphone unit can mass-produce by uniforming the performance
including the frequency characteristic, the sensitivity, and the like by eliminating the need for
individual adjustment of the acoustic resistance value individually.
[0017]
Further, according to the second aspect of the present invention, by providing the capacitor
portions on both sides of the insulating seat, it is possible to form a microphone unit having
stable directivity frequency characteristics and sensitivity, and variable directivity of both sides
facing type.
[0018]
FIG. 1 is an explanatory view showing an example of a cross-sectional structure when the
microphone unit according to the present invention is formed to be applied to a double-sided
face-to-face type, of which (a) The enlarged view of the broken line surrounding portion is shown,
respectively.
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Moreover, FIG. 2 is explanatory drawing which decomposes ¦ disassembles and shows the
member structure of the broken-line surrounding part in FIG. 1 (a).
[0019]
According to these figures, the microphone unit 11 is configured by the support ring 24 on
which the diaphragm 23 is stretched, and the back electrode plate 25 disposed opposite to the
diaphragm 23 with a predetermined gap interposed therebetween. The whole of the capacitor
portion 22 to be formed is formed as a double-sided antipodal type separately disposed on both
sides of the insulating seat 42.
[0020]
In this case, the insulating seat 42 having a substantially cylindrical shape with a low seating
height has a large diameter recessed portion 44 on one side surface and the other side surface,
and a small diameter recessed portion connected stepwise with the large diameter recessed
portion 44. The portions 45 are formed separately from each other, and the small diameter
recessed portions 45, 45 communicate with each other through the communicating holes 47.
[0021]
Moreover, as is apparent from FIG. 2, the small diameter recessed portion 45 is provided with the
annular projection 48 at a position slightly inward of the inner circumferential surface 45 a on
the far bottom 46 side. Thus, the bottom 46 side is divided into an outer deep bottom portion
46a and an inner deep bottom portion 46b, and is in communication with the communication
hole 47 through the inner deep bottom portion 46b.
[0022]
Each inner deep bottom portion 46 b is separately covered by a sheet-like acoustic resistance
material 52 exhibiting a circular shape.
The shape of the acoustic resistance material 52 may be a substantially circular shape in addition
to a true circular shape as long as it has a planar shape capable of reliably covering the
communication hole 47. .
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Moreover, as the acoustic resistance material 52, the plastic mesh in which comparatively stable
acoustic resistance value is obtained, the nylon mesh sheet ¦ seat (product number N-No. 420T)
made from NBC industrial Co., Ltd., etc. can be used suitably.
[0023]
Moreover, on the inner deep bottom portion 46b side of the insulating seat 42, a ring-shaped
elastic member 53 made of silicone rubber or the like is disposed with the acoustic resistance
material 52 interposed.
The elastic member 53 is formed to have a seat height higher than the depth of the small
diameter recess 45 in a normal state.
Further, a ring-shaped support member 55 made of a metal material or the like is press-fitted
into the small diameter recess 45 under the positional relationship supported by the annular
projection 48.
[0024]
Furthermore, in the insulating seat 42, the air chamber 32 is separately formed by mounting the
back electrode plate 25 on the annular peripheral wall 49 partitioning the large diameter
recessed portions 44. The condenser portion 22 is formed by disposing the support ring 24 on
which the diaphragm 23 is further stretched on the exposed surface side.
[0025]
Moreover, a male screw (not shown) is engraved on the outer peripheral surface of the annular
peripheral wall 49 of the insulating seat 42, and the condenser ring 22 is screwed by screwing a
connection ring 62 with a female screw (not shown) to the male screw. The whole of the doublesided face-to-face type microphone unit 11 provided separately is formed.
Reference numeral 26 in the figure indicates electrode lines drawn from each back electrode
plate 25.
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[0026]
Next, the operation and effects of the present invention will be described based on the illustrated
example, and the elastic member 53 is supported on the inner deep bottom portion 46 b side of
the insulating seat 42 after the acoustic resistance member 52 is interposed, The top surface can
be disposed under a state in which the top surface slightly protrudes from the small diameter
recess 45.
[0027]
Further, as a result of the support member 55 being press-fitly disposed in the small diameter
recessed portion 45 while pressing the protruding portion of the elastic member 53, the portion
to be pressed of the elastic member 53 is shown in FIG. As shown in), it protrudes as a bulging
part 53a.
[0028]
In addition, since the elastic member 53 is uniformly pressed by the support member 55 having
a larger diameter, the acoustic resistance member 52 in contact with the elastic member 53 can
also be uniformly adhered to the small diameter back bottom portion 46 a side.
[0029]
For this reason, since a gap allowing air leakage is not formed between the acoustic resistance
material 52 and the small diameter deep bottom portion 46a, the change in the acoustic
resistance value due to the air leakage is not generated. .
[0030]
On the other hand, although the elastic member 53 which is compressed and deformed is
projected as the bulging portion 53a on the communication hole 47 side, not only does the
swelling of the contact portion with the acoustic resistance member 52 not occur, but the
through hole Since the opening size of the portion 47 does not change, the acoustic resistance is
not changed.
[0031]
Moreover, since the acoustic resistance material 52 itself can be disposed without using an
adhesive, it is possible to prevent the occurrence of variations in acoustic resistance value due to
the penetration of the adhesive or the like.
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[0032]
For this reason, according to the present invention, it is possible to provide the microphone unit
11 of the both-sides antipodal type having stable variable directivity such as directional
frequency characteristics and sensitivity.
[0033]
The above has described the present invention based on the illustrated examples, and the specific
configuration thereof is not limited to this.
For example, although the microphone unit 11 exemplifies a variable directional condenser
microphone unit formed in a two-sided face-to-face configuration, it may be a single-directive
condenser microphone unit not having a two-sided face-to-face configuration. May be a dynamic
microphone unit.
[0034]
It is explanatory drawing which shows the end surface structure about an example of this
invention formed in the both sides facing type, and (a) shows the whole figure among them, (b)
shows the enlarged view of the broken-line encircling part of (a), respectively. .
Explanatory drawing which decomposes ¦ disassembles and shows each component member
based on the correspondence with FIG.1 (b).
Explanatory drawing which shows the cross-section about an example of the microphone unit
which pinched ¦ interposed the acoustic resistance material which exists conventionally from the
support member, and was arrange ¦ positioned.
Explanation of sign
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[0035]
11 microphone unit 22 capacitor portion 23 diaphragm 24 support ring 25 back electrode plate
26 electrode wire 32 air chamber 42 insulation seat 44 large diameter recessed portion 45 small
diameter recessed portion 45a inner circumferential surface 46 deep bottom 46a outer deep
bottom 46b inner deep bottom 47 Hole 48 Annular projection 49 Annular circumferential wall
52 Acoustic resistance material 53 Elastic material 53a Expansion 55 Support member 62
Connection ring
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