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DESCRIPTION JPS5593195

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DESCRIPTION JPS5593195
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a conventional
condenser type microphone, and FIGS. 2a and 2b are a side sectional view showing one
embodiment of a condenser type microphone according to the present invention and FIG. FIG. 3A
and FIG. 3B are side sectional views showing a modification of the gate electrode of the FET, and
FIG. 21
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ... Fixed electrode. ,
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser
microphone, and more particularly to an improvement of its inner microphone. Recently, in
condenser microphones, l! A so-called inner microphone has been realized in which a multiplier
element such as a flit gear increaser is organically incorporated into the microphone body. FIG. 1
shows, among such inner microphones, in particular, a book known as Mo j / q 1 ': J mourubi
type. That is, first, the diaphragm assembly ? is disposed to face the sound receiving hole 2 of
the case 1. Here, the diaphragm assembly is one in which the diaphragm 4 is stretched between
the fixing ring 5 and the spacer 6. Next, a fixed W pole 7 having a plurality of small holes 7a is
provided in the case 1 so as to be in contact with the spacer 6 so as to be in close proximity to
the diaphragm 4. Then, the printed wiring board 9 on which the integrated circuit parts 8 ░ 8
for forming the K, 1 tee amplifier are mounted while being in contact with the fixed type & 7 is
embedded, and the concave formed in the upper part in the middle of V For example, a resin
body 12 formed by molding an insulating resin such as an epoxy resin is used to form a Danno emounting stand having a plurality of small holes 7111 so as to close the air chamber 1o. It is
provided to be in close contact with the inner surface of 1. In addition, a damper 13 described
later is interposed between the fixed electrode 7 and the Dan-Yar right joint 11. Then, by closing
the opening at the lower end of the case 1 in the drawing at the lower end of 4 и 1 j with the lid
14 screwed with the case 1, the diaphragm assembly l, the fixed electrode 7 and the resin body
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12 etc. It is housed and fixed in the case 1. If there is a horizontal hole ?+ 12 *? and a damper
mounting stand No, and a damper # -13, which are formed in the corresponding portion between
the case 1 and the resin body 12, VC becomes unidirectional, and if there is no directivity,
Become. Also, the air chamber 10 is required to increase the capacity change due to the vibration
plate 4, and the air chamber 10 becomes the compensation capacity through the small holes 7 m
and 11 * of the fixed 1 pole 7 and the Danno mother-attachment 11. By providing the above, the
capacity change obtained by removing the suppression effect on the vibration of the imaging
plate 4 is made large. By the way, the mold-shaped inner microphone as described above has
been reasonably successful in terms of miniaturization, and there is much room for improvement
because there is no difference from the conventional one in other points. In other words, recent
needs are not only in the point of downsizing in the rate, but it is cost-only!
-и и и и This is because the book is self-consistent with the improvement of the habit. However,
according to the prior art, it is necessary to consider in the book that no consideration has been
taken in terms of performance as well as workability and price etc. In particular, it is essential to
mold the stool 12f mold including a preamplifier. Although there is an advantage that it can be
easily formed into a desired shape, it has not yet fully utilized such an advantage, and it has not
been able to meet the various needs as described above. That is, in the conventional book sex
including that of FIG. 1, in the attachment structure between the heart plate of the snail plate and
the fixed electrode, the sliding plate is simply placed on the apertured fixed 11 pole via the
spacer. As a result, the effective utilization rate of the imaging plate area where the plane drive is
inhibited due to the so-called edge effect is low, and thus the method has a disadvantage that the
superiority is poor. And when this uses an expensive electret for a fixed electrode, there is a
stagnation which can not utilize an electric charge effectively, and even if the presence of an
effective part will produce +-one, J and so-called Paris wrinkle distortion also As a result, one
effective drive and one capacity decrease and the conversion efficiency worsens (the same
applies to the case of a conventional fixed electrode). Furthermore, there is a problem that the
cost increase due to the presence of one spacer and the increase in the number of operation
steps are problems, and the attachment structure of the fixed electrode itself has a problem that
the lead extraction is complicated and weak. In addition, since the lateral holes to be formed for
unidirectionality require dispersion between the case and the resin body, both of them are
complicated. In this case, Dannoe is for providing a filter effect near the lower part of the fixed
electrode. Since the thickness of the adhesive or damper (usually paper or cloth) will cause
variations in the flatness of the fixed electrode due to variations in the thickness of the adhesive
or damper (usually paper or cloth) It was easy to bring about the undesirable situation of
adsorption. And while such a structure to obtain unidirectionality is basically required to cancel
out the sound source with 180 ░ phase difference, it is a system in which 90 ░ phase difference
is substituted, so it is b-pass, so it is not so good directivity Sex was not obtained. For this reason,
Z that eliminates the above-mentioned drawbacks is a book of a condenser microphone in
general, a problem of a kidney rush for an inner microphone for bamboo, and a Fi resin body in
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the case of a deer / mould inner microphone as well. It is highly desirable to further develop such
an ability organically, taking full advantage of the advantage that it can be easily molded into a
desired shape by molding.
This device is made based on the above situation rc, and as in the prior art, it is possible to
maintain a predetermined distance between the diaphragm and the identification electrode
without requiring a spacer, and the number of parts is small and economical. It is an object of the
present invention to provide a very good condenser type microphone which has an improvement
in assembling workability as well. Hereinafter, an embodiment of the present invention will be
described in detail with reference to the drawings. FIG. 2 (al 2) is a cylindrical case formed in a
cylindrical shape having a diameter of about 10 [.phi.], Which is formed of, for example, a
conductive material such as aluminum: -.mu. Metal material. At the upper part of the case 21 in
the drawing, a sound receiving portion 21b having a plurality of sound receiving holes 2F is
formed so as to close the upper part of the nucleus. A diaphragm assembly L ? ? is disposed to
face the sound receiving hole 21 * of the case 21. Here, the diaphragm assembly l ? ? is formed
by stretching the diaphragm 23 on the fixing ring 24. Next, a circuit element such as a preamplifier in the -F upper case 21 is embedded with a field effect transistor (hereinafter referred
to as "FET") 25 as shown by a dotted line in the figure, and epoxy, for example, A resin body 26
formed by molding an electrically insulating resin such as a resin is accommodated. That is, as
shown in FIG. 2 (at, (bl), a flat portion 26 a is formed in the upper portion of the resin body 26 in
the drawing. A recess 26b is formed at the center of the flat portion 26a, and the gate electrode
25a of the FET 25 protrudes from the bottom of the recess 26b. The fixed electrode 21 is
disposed on the upper 1 'plane portion 26a so as to close the recess 26b. Instead of this, a
constant electrode zr # 'i, for example, an electret or the like, is formed in a disk shape having no
hole smaller in diameter than the diaphragm 23. The fixed electrode 21VC is bonded to the tip y
# of the dirt 1 pole 25a of the upper ii 'FET 25 by, for example, a conductive adhesive. The
source electrode 25 b and the drain electrode 25 c of the J7 fFET 25 project from the lower
portion in the drawing of the resin body 26. In addition, of the flat portions 26 m of the resin
body 26, fixed with a super meter! A part Kit opposite to the circumference @ ? of the pole 27
and a part of a concave part 26c deeper than the concave part 26b are formed at several places
n. An elastic holding piece 26d is projected from the center of the bottom of the recess 26e, and
a small protrusion p26e is formed on the tip of the engaging piece 26d in the direction of the fi1.
Then, the fixed W miso 22 is attached to the resin body 26 as shown in FIG. 2 (1) by engaging
the upper peripheral side in the figure with the projection 26e of the upper eye 1 engaging piece
26d. It's a book.
That is, the upper part i, the second part 21d of the pancreas 21d and the practice 26e serve as a
fixed part for fixing the fixed electrode 27. : As a mounting means of the fixed electrode 27, the
projection 26 is not formed on the engaging piece 26d outside of the above-mentioned one, and
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the fixed th pole 27 is simply pressed from the engaging piece zeaVc and attached It is a good
thing. In the past, as described above, the fixed electrode 27 is attached by the solid portion
including the flat portion 26h and the engagement piece 26d formed by molding the resin body
26 including the FET 25 in the circular portion. Installation work can be facilitated. Here, the
recess 26c formed in the flat portion 26a of the resin body 26 corresponding to the side portion
of the fixed electrode 270 performs the same function as the air chamber 10 described in FIG.
This is to increase the change in capacity of the imaging moving plate 23. And, if this recess 26e
is formed deep, the capacity as an air chamber on the top and 4K, which can sufficiently provide
the elastic force of the engagement piece 26d, can also be taken sufficiently. As described above,
since the concave 1126c as an air chamber is formed on the peripheral side portion of the fixed
electrode 27 smaller in diameter than the diaphragm 23 and having no hole, it is possible to
obtain the movement of the imaging moving plate 23 Can be extracted from the entire fixed W
pole 21, and the effective utilization force of the area of the diaphragm 23 can be increased.
Furthermore, when an electret is used for the fixed electrode 27, the uniformity of one load can
be maintained, and it can be easily made by punching or the like because there is no hole, and
there is no gap between Paris and anti It is possible to increase the capacity and improve the
efficiency of withdrawal. Further, at the upper peripheral edge in the drawing of the resin
attachment 26, there is formed a peripheral edge zet which is in contact with the vibration t & 23
to hold the diaphragm 23 with the fixing ring 24. The peripheral edge portion 261 is formed so
as to be slightly higher than the upper surface of the fixed electrode 27 in the drawing, and an
extremely clear space is formed between the fixed electrode 27 and the diaphragm 23. ,
Vibration 0- ', and the .lamda..sub.1 plate 23 are made close to each other and are read. As
described above, a predetermined distance can be provided between the moving plate 23 and the
fixed electrode 27 without providing the spacer 6 (see FIG. 1) as in the prior art, and the number
of parts is small. Can be economically advantageous, and yield can be improved. Then, as
described above, the circuit element (FET 2s) in which one electrode (the 8-electrode 25a) is in
contact with the back surface of the fixed electrode 27 is embedded and the peripheral portion
261 on which the imaging plate 23 is mounted. The feature of this invention is that a resin body
26 is integrally formed by integrally molding the fixing portion for fixing the fixed electrode 21
at the inner lower portion of the peripheral portion 261.
Furthermore, an air vent 26g penetrating from the bottom to the middle of V of the resin body
26 is sharpened on the bottom of the recess 26ef. The lower lpK in the drawing of the resin body
26 is, for example, a breathable material 1 (such as felt or the like, through a Danno-j J formed in
a ring shape with a single charge) so as to close the vent hole 26M. The printed wiring board 29
is provided. In the printing seeding plate 29, vent holes 29a and through holes 29b are formed at
positions corresponding to the vent holes 26g of the resin body 26 and the source electrode
25b1 drain electrode 25c of the FET 25. The source electrode 25b of the FET 25 and the drain
electrode 25e of the FET 25 are inserted through the through holes 29b of the first fine wiring
board 29 and are formed on the lower surface of the immediate delivery wiring board 29 in FIG.
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An electrode 29e is also formed on the lower peripheral side of the printed wiring board 29 in
the figure by soldering n to the electrodes 29c and 29d, and is bent or bent to the lower
peripheral side in the figure of the case 2 '. As a result, the age writing plate 23 and the electrode
291 are electrically connected, and the diaphragm assembly, the resin body 26, the damper 28,
the printed wiring board 29 and the like are accommodated in the case 2 and fixed. It is Here, the
recess 26c as an air chamber formed in the drawing 1 'of the upper Tjc resin body 26 is an air
hole 26g. 2 Breathable Danno 4? 2 through the air hole 29m of the printed wiring board 29 (the
back side of the condenser type microphone shown alK, ie, the opposite side to the extension
where the sound receiving portion 21b of the case 21 is formed) ing. This means that the
condenser microphone has a single directivity which can cancel the 180 ░ phase difference
sound source. In this regard, as shown in FIG. 1, the conventional one has a lateral hole 1 m in
the case 1 and the resin body 12. Since 12 ? was formed so as to obtain single directivity at 90
░ phase difference, there was not obtained good directivity. Furthermore, forming lateral holes
12 & in such a resin body 12 is difficult in terms of forming the lateral holes 12 a, for example,
molding of the nucleus lateral holes 1211 has to be performed in a separate step. there were.
Further, this processing problem is the same as in the case 1, and forming the case IVc lateral
hole 1a entails an increase in the number of processing steps in the case 1 by n. As shown in FIG.
2 jal at 3 ░ knee ░░ C., unidirectionality can be obtained with 1800 phase difference, and
better directivity can be obtained compared to the conventional one.
Further, since the resin body 260 vent hole 26? is also formed in the vertical direction in the
drawing, it can be formed simultaneously with the molding of the other part, and the
manufacture is extremely easy. Furthermore, as in the prior art, it is not necessary to form the
case IK side hole 1a, and this is also advantageous in terms of manufacture and economy. In FIG.
2 fat, if the air holes 26g and 29m are not provided, it becomes nondirectional. In addition, the
front ic Danno +-jJ is provided at the lower part of the resin body 260 in the figure, and is held
between the resin body 26 and the printed wiring board 29 to be supported f. For this reason,
there is no need for an adhesive and the like as in the prior art, and the flatness of the fixed
electrode 27 varies due to the variation of stagnation of one member of the damper (for example,
felt etc.) Problems can also be eliminated. In this point, since the conventional one is provided at
the lower part in the figure of the solid 4 fixed electrode 70 through the damper 13 pipe
adhesive pipe as shown in FIG. 1, the adhesive or Danno 9 one member (for example, paper or
cloth) The variation in the thickness of the [beta] has an influence on the variation of the flatness
of the fixed II pole 7. That is, it has a problem that the variation of the thickness of the adhesive
or the Danno 4 member directly affects the distance between the fixed electrode 7 and the
diaphragm 4. However, if Dan A-211 is placed at the bottom of the resin body 26 in the drawing
as described above, the distance between the fixed electrode 27 and the diaphragm 23 can be
kept constant. The same effect as described above can be obtained even if Dan-e-28 is provided
so as not to abut on the fixed electrode 27 in a portion corresponding to the upper portion of the
vent 26g of the resin body 26 in the drawing. . Here, a protrusion 26 b is formed at the lower
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peripheral edge in the above-mentioned #H footwear 260 figure. Further, a recess 9291 is
formed on the printed wiring board 29 at a position corresponding to the protrusion 26 b of the
resin body 26. 5) With the resin body 26 housed in the case 2 as shown, the printed wiring
board 29 is housed so that the concave portion 291 is engaged with the protrusion $ 26 b of the
resin body 26. . At this time, while the resin body 260 air hole 26fH and the air hole 29h of the
printed wiring board 29 are in a corresponding relationship and linked, the printed wiring is
formed at the position where the source electrode 25b and the drain 11 pole 25c of the previous
description 1FET 25 protrude. The through holes 29 b of the plate 29 are located, and the source
electrode 25 b and the drain electrode 25 e are inserted into the through holes 29 b of the
printed wiring board 29. In other words, the printed wiring board 290 with respect to the vent
holes 26g of the resin body 26 and the source and drain electrodes 25b and 25c of the FET 25
by fitting the concave portions 291 of the projected portion 26bK of the resin body 26 with the
printed wiring board 290. The vent holes 29m and the through holes 29b are aligned.
In the prior art shown in FIG. 1, as described earlier, the case 1 and the resin body 12 have one
horizontal hole. It is difficult to form 12a, and the alignment between the lateral hole 1a of the
case 6 and the lateral hole 12a of the resin body 12 is also difficult. However, as shown in FIG. 2
(&), the resin body 26 of the printed wiring board 29 and the resin body 26 of the printed wiring
board 29 have a simple configuration as long as the concave portion 291 of the printed wiring
board 29 is fitted into the projection 26h of the resin body 26. Alignment with the FET 25 can be
performed, which is extremely convenient for the assembly operation. Furthermore, since the
source and drain 1i poles 25b and 25c of the FET 25 are connected to the electrodes 29c and
29d of the printed wiring board 29, such "?" "?" "?" can be exemplified ( i ? 2. 1 Temporary
connection when incorporated into P ? ? Ichiko equipment etc. 1. a-r easy. Here, FIGS. 3A and
3B (bl shows the connection means between the fixed electrode 27 and the r-125 h of the FET 25
respectively. 3 (al, shown as al, r ? of FET 25) electrode 25a is formed of a conductive member
having elasticity, and its gou) 1 [1i 25a tip portion is bent in a bellows shape and its pitch Each
vertex is located on the back side of the fixed electrode 27, that is, on the lower side in the
drawing 71. It is something that "is made to touch two bullets". In this way, as shown in FIG. 2 fal,
the contact IF product becomes large as compared with the case where the fixed end of the gate
electrode 25a of the single KFET 25 is connected with a pole xv K 411 adhesive etc. It is. Further,
the connection between the gate electrode 25h and the fixed electrode 27 is facilitated, and the
assembly workability is also improved. Next, as shown in FIG. 3 (the one shown in bl is embedded
with the rt electrode 25a of the FET 25 along the wall surface of the recess 26b of the resin body
26. Fixing type in the plane portion 26a of the resin body 26! The back surface 27, that is, the
lower surface in the drawing, is in contact with the date electrode 25a. In this manner, the
contact area is further increased as compared with that shown in FIG. 3 (alK), and the gate
electrode 25m of the FET 25 is embedded in advance when the resin body 26 is molded, so
Than? It becomes easy. In addition, the resistance to oxidation and corrosion is increased
because the jacket electrode 25a of the FET 25 and the constant electrode 27 are not in dip
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contact, which is an advantage. More reliable conduction can be achieved by bringing the point
11J5m of the FET 25 into surface contact with the side end of the fixed electrode 27.
The present invention is not limited to the above embodiment, and can be modified and
implemented without departing from the scope of the invention. Therefore, as described in detail
above, according to the present invention, the back surface VC1 of the fixed electrode or the n
contact circuit elements is embedded and the peripheral portion on which the diaphragm is
placed and the inner surface of the peripheral portion Since the resin body formed by integrally
molding the fixing portion for fixing the fixed electrode in the portion is provided so as to
provide a resin body as in the prior art, a predetermined distance between the diaphragm and the
fixed 11 poles is fixed without the need for a spacer. It is possible to provide a very good
capacitor-type microphone which can maintain the following characteristics, has a small number
of parts, is economical, and has an improved assembly workability. 4, a brief description of the
surface, 1t13 ? 1 side sectional view showing a conventional capacitor-type microphone, 2'm
(at, (bl, the embodiment of a capacitor-type microphone according to the present invention is
shown Fig. 3 is a side sectional view and a plan view showing an essential part sf of the
embodiment and an enlarged view thereof, and Fig. 3 (at (bl is an r- of each of fLPET) electrodes.
21: Case, 22-G moving plate assembly, 25-FET, 26-resin body, 26c-recess, 22: fixed electrode.
Applicants Attorney Attorney Takehiko Suzue 0,. List of attached 1M class ?░? ?one? family
(2 items 1 (4) request duplicate 1 copy 6, inventor other than the above, applicant for utility
model registration, agent (1) inventor Kanagawa prefecture No. 33, Shin-yushi-cho, Yokohama
City Tokyo Shibaura Electric Co., Ltd. Sound factory Uchiha 1) Hiroto (2) Agent address
Toranomon 1-chome Toko-mon 1-chome, Minato-ku, Tokyo 17 '17 Mori Building, ', ... EeM name
(57 private patent attorney Miki gt 'и ?? ; ? (?-samurai address same office,-nee-name (6881)
patent attorney Tsuboi kei: '--', go--1 "i J-+ E Wake
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