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DESCRIPTION JPS5189431

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DESCRIPTION JPS5189431
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an
example of a conventional electret microphone, and FIG. 2 is a perspective view showing one
embodiment of the electret microphone according to the present invention, and FIGS. 3 and 4
The drawing is a longitudinal sectional view showing an embodiment in the case of filling a resin,
FIG. 5 and FIG. 6 atb are longitudinal sectional views showing an embodiment for installing a
mounting bracket, and FIG. 1 an embodiment in the case of having directivity. And FIG. 8 and
FIG. 9 are longitudinal sectional views showing other embodiments. 1, 21 и и и и и и и и Cross 2,22 и и и
и и и и и и Capsule, 3, 23 и и и и и и и и и и и и и и и и и и и и и 5, E и и и и и и Gate terminal, 28 и и и и и и Lead wire, 9, 29,
и и и и и и Microphone unit portion, 10 и и и и и и и и и и и и и и и и и и и и amplifier circuit chamber, '14, 36 и и и
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Amplifier circuit part, 16, 37,941 иии иииииии
Resin, 38 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Elastic ring, 51 ииииииииииииииииииииииииииииии иgroove. Ц 1
day-75-Judo 51-89431 (2) Ц Z eyes 3 days Ц 5 figures /) Day (I1) ? 6 days (b) 37 ? (7 ? ? DJ
? 76-actual opening Sho 51-89431 (3) Ц 7 ? ?-77-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to an electret microphone.
FIG. 1 is a longitudinal cross-sectional view showing an example of a conventional electret
microphone. In FIG. 1, the conventional electret microphone has a microphone unit portion 9 and
an amplifier circuit portion 15, and a cylindrical amplifier holder 0 is provided between the micro
unit portion 9 and the printed circuit board 14 provided with the amplifier circuit portion 15.
The inside of the holder forms an amplifier circuit portion 1 accommodating the amplifier circuit
portion 15 and a chamber 16. In the usual case, the diaphragm 611; A small hole is made in the
back electrode 4 opposite to 2.9 иии, and a rear chamber 12 is provided in the rear of the back
electrode 4. The rear chamber 12 is sealed by, for example, covering a hole for passing the back
electrode gate terminal provided in the back electrode holder 5 with a resin 16 or the like. Then,
by creating the rear chamber 12, the characteristics of the electret microphone (for example,
directivity characteristics, frequency characteristics, etc.) were controlled? The microphone unit
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9 and the amplifier holder 10 accommodating the amplifier circuit unit 15 installed on the
substrate 14 are housed in the amplifier case 11 and integrally coupled to each other.
Incidentally, even if a part of the lower end of the amplifier case 11 is bent and the substrate is
crimped and fixed, the conventional electret microphone described above is attached to
something like a tie pin since the printed substrate is provided at the lower bottom of the capsule
Even in the conventional case, however, the characteristics of the microphone have been
developed, and when a shield plate is added, the manufacturing method tends to be poor and the
price tends to be high. Also, the conventional electret microphone has to be provided with a rear
chamber 12 (2) i, which controls the characteristics of the electret microphone, and an amplifier
circuit portion chamber 13 for housing the amplifier circuit portion 15, so the electret
microphone is made of thin cedar It was difficult to Therefore, the range of use was also
determined. It is an object of the present invention to provide an electret microphone which has
been regarded as a turtle in such a situation and which has good characteristics, is inexpensive, is
easy to manufacture, and can be attached to various objects. In order to achieve this object, the
four alternatives are an electrostatic type electroacoustic conversion means having a back pole, a
back pole holder for supporting a back face, a back pole connected to the back pole, and a back
end of the back pole. And a capsule for accommodating the conversion means, the back electrode
holder, and the circuit unit, and a mounting bracket for mounting the lower bottom of the
capsule. An embodiment of the electret microphone according to the present invention will be
described in detail based on the drawings below.
FIG. 6 is a perspective view of the elect L 5) two-go red mike attached to the tie bottle, and FIG. 6
is a longitudinal sectional view thereof. In FIG. 2, the microphone unit ? covers the cylindrical
capsule ? provided with the cross 2 at the upper opening, the internal device (shown in FIG. 6)
housed inside the capsule, and the bottom of the capsule ?. The mounting bracket 30 is fixed to
the tie pin by screwing. Fleet water is drawn from the capsule ?. The electret microphone shown
in FIG. 6 eliminates the back chamber and the small hole of the back electrode conventionally
provided for controlling the directivity characteristic, and the directivity characteristic is a thin
fluid rise of the cabinet ? and the back electrode 24. Controlled by In FIG. 3, a cross ? is
provided in the upper part of the capsule l, and the diaphragm% at a position parallel to the cross
Z and the back electrode 24 made of a flat plate form electrostatic type acoustoelectric
conversion means. There is. The diaphragm 3, the back electrode 24, the annular self-supporting
holder b supporting the back 24, and the amplifier circuit unit 5 are accommodated in the capse
(4)... . The rear portion of the back electrode 24 is sealed by resin filling, and the amplifier circuit
portion is fixed to the space by a bending spring. Further, the lower base of the capsule ? is
covered with a mounting complicator serving also as a shield plate for giving characteristics, and
the lower end of the capsule knife is crimped. Thus, the tie bin 62 is attached to the mounting
bracket 30 via the screw 61. In addition, the FM that forms the amplifier circuit part? The gate
contacts of the% are heated to the back 24 directly by spot welding or by soldering. Further,
since the capsule ? is too deep even when the back pole holder b is accommodated, the back
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pole holder b is covered with resin by filling the resin to the side of the lower open end of the
capsule ? ? ? ?, and the capsule l The gap between the and a back Nelda ? is sealed. When
filling the resin in the history, take into consideration the screw, and the resin should be slightly
rounded to secure the space between the resin surface itself and the mounting metal accomplice,
and it is recommended that the tie pin be installed. In order to bring the capsule ? into contact
with the back electrode holder b ? as shown in FIG. Small groove products are cut along a part
IIl of the back electrode holder b in a part of the portion where the annular back electrode holder
b contacts with the cover ?, and the small groove products correspond to the rear chamber By
filling the back electrode holder ? with a small hole so as to communicate with the space, the
filled resin is injected into the small # 1 product through the small hole so that the capsule ?
adheres to the back electrode holder b.
The structure for coupling the capsule ? and the mounting bracket may be as shown in FIGS. 5
and 6 (a and b) in addition to FIG. That is, FIG. 5 is a structure in which the end between the
mounting brackets is crimped and fixed to the capsule ?. FIG. 86 La) to FIG. 6 tb + are grooves in
the mounting bracket for attaching the crimped portion 51 to the capsule n. It is a structure
which attaches a habit and makes both determine in a bond. In order to make the electretlet
microphone according to this invention have a single directivity, as shown in FIG. 7, a pipe is
provided so that sound can enter between the diaphragm 2 and the back electrode 24, and resin
filled Sound in the dark of the diaphragm ? and the spine, as shown in Fig. 7 and in the form of
a gang, like a pipe in which the back electrode holder b is embedded or when the back electrode
holder b is in communication with the outside world ] 1, L at t. And-) It should be made to enter
the front phase. In this case, there may be provided a device capable of optionally blocking a pipe
ditch or a hole communicating between the diaphragm ? and the bridge 24 so that it can be
switched to no directivity. When a sound mark comes into the electret microphone described
above, the change of the electric capacity due to the vibration of the diaphragm ? is inputted to
the amplifier circuit unit by the electric signal, and after being amplified by the ? and и the
amplifier circuit unit. It is output. In the case of the embodiment of the present invention
described above, the resin filling has an effect of simplifying the assembly as compared to the
conventional electret microphone. An embodiment different from the embodiment described
above is shown in FIG. Also in this case, the characteristics of the microphone (such as directivity
characteristics or pigeon wave number characteristics) are controlled only by the thin fluid layer
between the diaphragm and the back. In FIG. 8, the cross Z, diaphragm ?, back pole 24, back
pole holder b% FIt & gate terminal dual amplifier-path 8%, screw 61 etc. are the same as the
embodiment shown in FIG. A number is attached and the description is omitted.) -1 ░ 3) --3 ░, 2 ░. In the case of s8, the space between the spine holder ? and the diaphragm 26 is sealed
with resin; , ': J, f,-':, + fluid seal between the plate ? and the back -24. , 1 ? (i ya t, r, aa 7-0 aa. 3
mg h v, ',', j ;, The town board product is fixed to the lower base [1 i 11] of the tecapsule ? by
caulking the lower end of the capsule blade. In addition, there is a processing clearance on the
contact portion between the capsule ? and the ring, and there is also a clearance on the
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adhesive surface between the ring 9 for holding the diaphragm ? and the diaphragm 5 from
above and below, and the spacer chip. Therefore, in order to eliminate these gaps, an elastic
tongue is inserted between the ring 9 and the capsule ?.
Between the mounting brackets are attached to the lower portion of the printed circuit board,
and a tie bin or the like is attached to the mounting bracket J by screwing. Also in the case of the
embodiment shown in FIG. 148 described above, the method for achieving unidirectionality, the
mounting between the mounting brackets may be performed in the same manner as the first
embodiment like 1i Ii. In addition, elastic green chrysanthemum may be used in other
embodiments. ?) ? ░,... T1? ?) ?? ? ? Next, another embodiment different from the one
shown in FIG. 188 is shown in FIG. 9 and another embodiment shown in FIG. 19% FF, gate
terminal moth, amplifier circuit 5, screw 61, spacer cricket, ring 9, elastic ring moth, between
slope accessories, printed circuit board products etc. are the same as in the embodiment shown
in FIG. The explanation is omitted. In l89-, the back electrode 24 [a small hole is made, and the
thin fluid layer between the diaphragm and the back & 24 is circulated to the space
accommodating the amplifier circuit portion. Thus, in order to completely seal the space, the
space between the printed circuit board and the lower end of the capsule: the caulking portion at
the end is sealed by the resin 41. ??????? ????????? Control is done in the
space. Also in the case of the embodiment in FIG. 119 described above, the structure for
providing unidirectionality, the structure for installing the mounting bracket, etc. may be the
same as in the first embodiment. In the case of the embodiment described with reference to FIG.
9, by sealing the darkness between the printed circuit board and the caulking portion of the
capsule with a resin (9)], the solder of the printed circuit board is GCI # at the time of lead wire
solder welding. It has the effect of preventing shorting to the capsule. Although the embodiment
of this invention has been described in detail based on the above description, this invention is not
limited to the above embodiment, and the amplifier circuit unit may use an IC or the like, and this
electret microphone In addition to the tie pin, it may be used for a clip attached to a wide area, a
blood pressure needle pulse sound detection, etc. In addition, the shape of the back surface m24
is not limited to a simple flat plate, and various back electrodes in which asperities and the like
are formed outward can be used. The electret microphone according to this invention covers the
lower bottom of the capsule with a mounting bracket, and by providing a shielding effect to the
mounting bracket, the characteristics of the microphone are made to be inconspicuous. In
addition, the fitting can also be used as a ground. Therefore, since the number of parts is
reduced, manufacture is easy and inexpensive. Furthermore, it can be used conveniently by
installing it on a tie pin, a clip or a sphygmomanometer. (10) ? ? ? 7) C
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