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DESCRIPTION JPS5544207

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DESCRIPTION JPS5544207
Specification l1 Name of invention
Method for manufacturing electret microphone
3 DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for
manufacturing an electret diaphragm which can mount a case main body in a state of anger
without degrading its characteristics. Conventionally, as shown in FIG. 1 to manufacture a
microphone unit, the microphone capsule 2 is housed in one end portion of the inside of the case
body l, and the amplifier for inductance conversion is held at the other end portion And the
cylindrical spacer 4 sets the microphone capsule 2 and the printed wiring board 30 in the
direction of the backward movement. In this case, one end IJI of the case main body 1 is bent in
advance into one marrow, the printed wiring board 3 is inserted from the upper part, the printed
wiring board 3 is engaged with this folded part, the spacer 4 is inserted, Finally insert
microphone capsule 2. At this time, the upper end 1 b of the case main body 1 is positioned at
the central part of the sole on the outer peripheral surface of the microphone capsule 2. In this
state, the upper end 1 b of the case main body 1 is caulked to the microphone capsule 20 M 1 m
and the case main body 1 and the microphone capsule And the printed wiring board 3 and the
spacer 4 are fixed inside. However, in the electret microphone made by this conventional method,
the engaging force between the case 1 and the microphone capsule 2 is weak and 1, for example,
when the printed wiring board 3 is strongly pushed up, the microphone capsule 2 becomes End
Page: 1 case l There was a problem that accidents like going out easily occurred and lacking in
reliability. The microphone capsule 2 has an internal structure as shown in FIG. 2. That is, as the
case 5, a turtle whose upper end 5 m is fil K bent inward and whose lower end 5 bri is opened is
used. The ring 7 to which the electret shake IIjJ plate 6 is attached is inserted from the open side
of the case 5, then the spacer 8 is inserted and the last (the back pole holder 9 holding the back
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1
pole is inserted, and in this state, the lower end 5 b And the ring 7, the spacer 8, and the back
pole holder 9 are fixed inside the case 5 by caulking to the outer end face of the back pole holder
9. According to the conventional manufacturing method, in order to integrate the microphone
capsule 2 and the case 1 (since an applying force is given to the body part of the microphone
capsule 2, for example, the ring 7 is shaped like a circle, the diaphragm 6 is deformed and a
microphone There is a problem that the yield of the product decreases due to deterioration of the
characteristics of the product. Although the ground of the amplifier - tl is caught in the case of
the case body l and the case 5 of the microphone capsule 2, since the crimping force is not so
strong, the earth @ ts is easily pulled out and a contact unnecessary accident - II raising There
was also a drawback that it was easy. In addition, unless the dimension n degrees of the case
body 1 and the microphone capsule 2 is increased, caulking can not be performed satisfactorily.
The present invention does not deteriorate the characteristics of the microphone,! It is an object
of the present invention to provide a method of manufacturing an electret 1 microphone which
can vertically couple an earphone part. Hereinafter, the method of manufacturing the electret
microphone of the present invention will be described in detail with reference to the
embodiments thereof with reference to the drawings of FIGS. In the present invention, the
formation of the case body 1 has one feature and is formed as follows. That is, as shown in FIG.
4A, a cupped body having a flange portion 1 0 is formed from a metal flat plate, for example, an
aluminum flat plate by drawing to the outer peripheral edge of the opening end portion. Then,
the cylindrical cutter 11 having a circular diameter slightly larger than the outer diameter of the
cup-shaped body as shown in FIG. 4B is used to cut and remove the flange portion 1O, and the
bottom surface Ks side of the cup- A round hole 3 is formed in the central portion leaving the
new curved portion 12. In this case, the sum is such that the tapered surface of the inner surface
on the open side formed along with the formation of the flange portion of the drawing process is
held. Therefore, on the open surface side of the case body 1, a tapered surface 14 having a
diameter gradually increasing from the inner state to the outer region is formed. The printed
wiring board 3 is inserted from the upper end of the case main body 1 and engaged with the
bent portion 12 on the bottom surface to fix it. Further, a cylindrical spacer 4 is fitted and
inserted into the case body 1 at the circular side portion of the printed wiring board 3. And the
microphone capsule 2 is accommodated on the spacer 4. In the case of voice, the grounding-tl of
the board of the printed wiring board 3 is sandwiched between the six circumferential surfaces of
the case main body 1 and the outer circumferential surface of the case 5 of the microphone
capsule 2. Finally, on the outer end face of the microphone capsule 2 fitted in this way, the open
end side where the tapered face 14 of the main body case 1 is formed is caulked and fixed. In
this case, when crimping the upper end of the main body case 1, it is convenient to use a
clamping jig as shown in Fig. The caulking fixture mounts (5) the main spindle 15 on a mail
board or the like, rotates, and mounts the countershaft 16 rotatably at a position deviated from
the axial center of the spindle 15 at the tip. The end of this countershaft 16 is mounted inclined
toward the axis center of the main spindle 15, and the spindle Is is rotated so that it is caulked
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from the fuselage 7 vc mounted on the counter shaft 16. By the rotation of the main shaft 15, the
countershaft 16 performs a so-called mini-reeling motion. On this day wA 17 warns against the
crimped portion Vc of the main body case l and causes the main shaft 15 to descend downward
while causing the countershaft 16 to move all the misori and the white portion 17 is rotated
along the circumferential edge of the upper end portion of the main body case 1 and pressurized
Thereby crimping the upper end portion of the main body case 1.
18 is a lower odor which holds the body case 1 to be caulked. As described above, according to
the method of manufacturing the electret microphone of the present invention, the tapered
surface 14 is formed in the case main body 14, and this portion can be caulked inwardly (by
crimping with a relatively weak force due to the presence of the tapered surface 14 Therefore,
there is no fear of deteriorating the i-microphone characteristics by deforming the inner part
tube, and it is strongly coupled because it is folded into a circle. (6) EndPage: Since the upper end
of the main body case l is caulked along the two bent portions, there is a slight gap between the
microphone capsule 2 and the main body case 1, so that it is possible to reliably perform
crimping, It makes setting easier. In addition (because the length that sandwiches the earth @ 11
grips, the contact becomes better and the part on the front of the main case 1 is caulked, so its
force is It works strongly in the axial direction of the body, it is strong and can hold the earthing
edge t1 in between and maintain long-term stable b). Because of the existence of the father and
tapered surface 14 ', there are some variations in the bulge of the body of the microphone
capsule 2 and it is easy to insert into the body case l. Furthermore, because of this tapered
surface 14, when the upper end of the upper end gvC main body case 1 of the capsule 2 is
caulked, a trapezoid does not occur without giving pressure to the capsule 2. Furthermore, since
the upper end of the main body case l is caulked toward the upper surface of the capsule 2, the
caulking force works in the axial direction of the capsule 2, and from this point as well, it is
expected to improve the yield without deforming the capsule 2. Furthermore, it is possible to
reduce the production cost by continuously producing automatic production of (7) and accurate
dimensions using a cylindrical cutter by drawing from a cup shape body plate which becomes a
main body case. X, when it is crimped by using the jig jig as described above, it is crimped by the
white part 17 and crimped, so there is no spring back of the bent part, and it can be crimped to ii
* , The capsule 2 and the main body case 1 can be brought into close contact with each other.
Furthermore, since the upper surface of the white portion 17 t 1 body case 1 is pressurized in
the axial direction, no unnecessary force is given to the capsule 2. It is convenient if the shape of
the case 5 of the capsule 2 to be used for this generation is such that an annular stepped portion
19 is formed at the bent portion of the front portion as shown in M6. The presence of this
stepped portion 19 reinforces the strength of the front surface portion of the capsule 2, and this
deformation can be prevented. In addition, when crimping the lower end 5 b of the capsule 2, a
tensile force is applied to the upper surface and the bent free end 20 is warped so that the
volume 1 a 1 a of the front chamber 21 formed in front of the diaphragm 6 changes, It is also
possible to prevent the characteristic of 1 chick from changing.
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3
As explained in detail above, according to the manufacturing (8) method of the present invention,
dimension precision! vr Easy process without requiring special request, microphone
characteristics - Without deterioration Small mil solid, long-term stable electret microphone with
low manufacturing cost It is possible to dwell on large ik Become.
4, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 g 1 is a cross-sectional view for explaining a
conventional example, FIG. 2 is a sectional view for explaining the structure of a microphone
capsule of an electret microphone, and FIG. 3 is a cross- FIG. 5 is a cross-sectional view showing
an example of a caulking jig used for the method of the present invention, and FIG. 6 is a
sectional view showing the structure of a microphone FIG. 4 is a view showing an example of a
shape of a case of a capsule. Special 1 Applicant Star Electrical Appliance Manufacturing Co., Ltd.
Agent Takashi Kusano ·, ',', - (9) EndPage: 3
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4
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