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DESCRIPTION JP2004343368

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DESCRIPTION JP2004343368
An object of the present invention is to prevent performance deterioration of a condenser
microphone due to metal powder generated by screwing of a lock ring made of a metal material
in both a unit case and a lock ring. A unit component including a diaphragm ring (31) having a
diaphragm (32), a spacer ring (41) and a fixed electrode (51) supported by an insulating seat
(61) in a metal unit case (10) having sound introducing holes (12a, 12b) on the front surface. In
the condenser microphone unit, in which the unit parts are accommodated and fixed by the
tightening force of the metal lock ring 71 which is screwed toward the insulating seat 61 from
the rear surface side of the unit case 10, the insulating seat 61 and the lock ring 71 In the
meantime, an elastic ring 81 made of a rubber material compressed by the lock ring 71 is
interposed. [Selected figure] Figure 1
コンデンサマイクロホンユニット
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
condenser microphone unit, and more particularly to a lock means for pressing and fixing a fixed
pole side to a diaphragm ring housed in a unit case. . [0002] A condenser microphone unit has a
condenser element in which a diaphragm vibrating with sound waves and a fixed pole (back pole)
are opposed via an air layer at a predetermined interval, and this condenser element is a unit It is
assembled in the case. One example is described with reference to FIGS. 3 to 5. FIG. 3 is a front
view of the condenser microphone unit, FIG. 4 is a sectional view taken along the line A-A, and
FIG. 5 is an exploded sectional view. According to this, a cylindrical unit case 10 having a large
number of sound introducing holes 12 in the front surface 11 which is one surface and the rear
surface 13 side which is the other surface is provided. The unit case 10 is made of metal, and in
this example is made of brass. Further, the sound introducing hole 12 includes a long slit 12 a
having a length extending from the peripheral portion to the central portion and a short slit 12 b
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having a length shorter than that, and the long slit 12 a and the short slit 12 b are short. The slits
12 b are alternately arranged at equal intervals along the circumferential direction. An internal
thread 14 is formed on the inner peripheral surface on the rear surface 13 side of the unit case
10. Inside the unit case 10, the front mesh 21, the diaphragm ring 31, the spacer ring 41, the
fixed electrode 51, and the insulating seat 61 made of synthetic resin are inserted in this order
from the rear surface 13 side. A diaphragm (diaphragm) 32 vibrating by sound waves is
stretched on the surface of the diaphragm ring 31 facing the fixed electrode 51. The spacer ring
41 is made of a synthetic resin sheet formed in an annular shape, and secures an air layer of a
predetermined distance between the diaphragm 32 and the fixed electrode 51. The fixed
electrode 51 is supported by the insulating seat 61 so as to be electrically insulated from the unit
case 10 and the diaphragm 32. Although not shown, an electret film is formed on the fixed pole
51. Further, the insulating sheet 61 is provided with a lead-out electrode rod 62 for taking out a
signal from the fixed pole 51. A lock ring 71 having a male screw 72 screwed with the female
screw 14 is inserted into the rear surface 13 of the unit case 10, and the lock pole 71 is fixed to
the diaphragm ring 31 via the insulating seat 61 by the lock ring 71. A pressing force is applied
to fix the entire unit components including the diaphragm ring 31 and the fixed electrode 51.
A metal ring is used as the lock ring 71, and in this example, the lock ring 71 is made of brass
like the unit case 10. Although there is also a model in which the end edge on the rear surface 13
side of the unit case 10 is crimped and fixed without using the lock ring 71, the fixing with the
lock ring 71 is a microphone designed mainly with emphasis on performance. Has been applied.
That is, when an excessive stress is applied to the unit component, displacement occurs. Even if
the displacement is small, the performance may be degraded, so in a microphone where
performance is important, the lock ring 71 adjusts the pressing force and fixes the stored items
with the minimum necessary stress. I am trying to do it. However, according to the abovementioned prior art, there are the following problems. That is, since the female screw 14 of the
unit case 10 and the male screw 72 of the lock ring 71 are both formed by cutting, metal powder
is generated due to rubbing at the time of screwing. When the metal powder is sandwiched, for
example, between the diaphragm 32 and the spacer ring 41 or between the spacer ring 41 and
the fixed electrode 51, the air layer is formed in the air layer between the diaphragm 32 and the
fixed electrode 51. Leakage occurs and degrades the directed frequency response. In addition,
when the metal powder gets into between the fixed electrode 51 and the inner circumferential
surface of the unit case 10, an electrical leakage occurs from the fixed electrode 51, which
causes noise. Therefore, it is an object of the present invention to prevent performance
deterioration due to metal powder generated due to screwing of the lock ring when pressing and
fixing the unit parts housed in the unit case with a predetermined stress by the lock ring. It is to
do. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention comprises a metal cylinder having a sound introduction hole on one side and an open
side on the other side, which is opened. Diaphragm ring including a unit case having an internal
thread on the end side inner surface and having a diaphragm from the open end side toward the
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sound introducing hole in the unit case, a spacer ring, a fixed electrode to the diaphragm, and An
insulating seat is inserted in this order, and a metal lock ring having an external thread screwed
with the female screw is mounted on the back surface of the insulating seat, and the fixed pole is
installed via the insulating seat by the lock ring. In the condenser microphone unit pressed and
fixed to the diaphragm ring side with a predetermined pressure, the lock ring is disposed
between the insulating seat and the lock ring. Elastic ring made of a rubber material to be
compressed is characterized in that it is interposed me.
According to this configuration, even if metal powder is generated due to rubbing at the time of
screwing of the lock ring, since the elastic ring is interposed between the insulating seat and the
lock ring, the metal powder Of the elastic ring is fitted on the inner surface of the unit case
adjacent to the end of the female screw. Preferably, it is formed in an annular shape. Moreover,
as a rubber material used for the said elastic ring, the silicon-type rubber material excellent in
electrical insulation is preferably employ | adopted. BEST MODE FOR CARRYING OUT THE
INVENTION Next, an embodiment of the present invention will be described with reference to
FIGS. 1 and 2. FIG. FIG. 1 is a sectional view showing the internal structure of a condenser
microphone unit according to the present invention, and FIGS. 2 (a) and 2 (b) show sectional
views of a unit case and an elastic ring provided in the condenser microphone unit. In the
description of this embodiment, the same reference numerals are used for constituent elements
which may be regarded as identical or identical to the conventional example described above.
Also in this condenser microphone unit, a cylindrical unit case 10 made of, for example, brass is
provided. The front surface 11 of the unit case 10 may be provided with a large number of sound
introduction holes 12 including a long slit 12a and a short slit 12b, as shown in FIG. The rear
surface 13 side of the unit case 10 is open for inserting a unit component, and an internal thread
14 is formed on the inner peripheral surface by cutting. According to the present invention, as
shown in FIG. As shown in Fig. 2 (b), a ring receiving groove 15 is formed annularly adjacent to
the female screw 14 and inside the ring, and an elastic ring 81 shown in Fig. 2B is mounted in
the ring receiving groove 15. The assembly procedure will be described. First, the front mesh 21
is inserted into the unit case 10 from the rear surface 13 side toward the front surface 11 side. A
wire mesh can be used for the front mesh 21. Next, the diaphragm ring 31 with the diaphragm
32 stretched is inserted with the diaphragm 32 facing backward, and the spacer ring 41 is
disposed around the diaphragm 32. The lead-out electrode rod 62 is inserted into the insulating
seat 61 and the fixed pole 51 is attached to the front surface thereof, and the insulating seat 61
is inserted into the unit case 10 with the fixed pole 51 facing the diaphragm 32.
Then, after the elastic ring 81 is mounted in the ring storage groove 15, the lock ring 71 having
the male screw 72 on the outer periphery is screwed into the female screw 14 of the unit case
10, and the elastic ring 81 is tightened so as to be compressed appropriately. In this example,
since the lock ring 71 is also made of brass like the unit case 10, metal powder is generated by
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rubbing at the time of screwing, but the periphery of the insulating seat 61 is sealed by the
elastic ring 81. The metal powder does not enter the fixed electrode 51 side. Therefore,
deterioration of the directional frequency response due to air leakage of the air layer between the
diaphragm 32 and the fixed pole 51 which has been a problem in the above-mentioned
conventional example, or between the fixed pole 51 and the inner peripheral surface of the unit
case 10 Problems such as noise generation due to electrical leakage due to metal powder
between the two are eliminated. The elastic ring 81 is formed of a natural or synthetic rubber
material or the like, but a silicon rubber material is preferably adopted from the viewpoint of
electrical insulation. Further, since the elastic ring 81 is compressed by the tightening of the lock
ring 71 and spreads in the inner diameter direction, the air tightness between the unit case 10
and the insulating seat 61 can also be ensured. Furthermore, since the tightening force of the
lock ring 71 is applied to the unit parts including the diaphragm ring 31 and the fixed pole 51
via the elastic ring 81, the tightening force can be made uniform and stabilized. In the above
embodiment, the ring housing groove 15 is formed in the unit case 10 in which a part of the
outer peripheral side of the elastic ring 81 is fitted. In some cases, however, the ring housing
groove 15 is formed. Alternatively, the elastic ring 81 may be directly disposed on the back side
of the insulating seat 61 with substantially the same diameter as the insulating seat 61, and such
an embodiment is also included in the present invention. In addition, although brass is used for
the unit case 10 and the lock ring 71, another metal material such as aluminum may be used.
Further, the present invention is not limited to the electret condenser microphone in which the
fixed electrode 51 is provided with the electret film. As described above, according to the present
invention, the diaphragm ring, the spacer ring and the insulation having the diaphragm in the
unit case made of a metal cylinder having a sound introducing hole on the front surface A
capacitor microphone unit in which a unit component including a fixed pole supported on a seat
is accommodated, and the unit component is fixed with a clamping force by a metal lock ring
screwed from the rear surface side of the unit case toward the insulating seat, By inserting an
elastic ring made of a rubber material compressed by the lock ring between the insulating seat
and the lock ring, performance degradation of the condenser microphone due to metal powder
generated by screwing of the lock ring is prevented. can do.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an internal
structure of a condenser microphone unit according to the present invention. FIG. 2A is a crosssectional view showing a unit case included in the condenser microphone unit, and FIG. 2B is a
cross-sectional view showing an elastic ring included in the condenser microphone unit. FIG. 3 is
a front view showing a conventional condenser microphone unit. 4 is a cross-sectional view taken
along line AA of FIG. 3; FIG. 5 is an exploded cross-sectional view of the conventional condenser
microphone unit. [Description of the code] 10 unit case 11 front of unit case 12a, 12b sound
introduction hole 13 rear surface of unit case 14 female 15 ring storage groove 21 front mesh
31 diaphragm ring 32 diaphragm 41 spacer ring 51 fixed pole 52 lead electrode rod 61
insulation seat 71 lock ring 72 male screw 81 elastic ring
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