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DESCRIPTION JPH0725700

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DESCRIPTION JPH0725700
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electret condenser microphone, and in particular, an electret condenser including a terminal
holding portion for holding an output terminal by bending an end of an output end and soldering
the output terminal holding portion. It relates to a microphone.
[0002]
2. Description of the Related Art As a conventional example of an electret condenser microphone,
there is a type in which the output terminal is inserted into a wiring board and the output
terminal is soldered to the wiring of the wiring board. This conventional example will be
described with reference to FIG. In FIG. 3, reference numeral 11 denotes a cylindrical container
of an electret condenser microphone, which is made of, for example, an aluminum thin plate.
Reference numeral 12 denotes a front plate of the cylindrical container 11, and 13 denotes a
sound hole formed at the center of the front plate 12. Reference numeral 15 denotes an electret
vibrating film, and reference numeral 18 denotes a back electrode facing the electret vibrating
film 15 to form an electret capacitor with it. Reference numeral 21 denotes a cylindrical back
electrode holder for holding the back electrode, 28 an insulating plate, and 29 a shield plate
covering the insulating plate 28.
[0003]
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1
Reference numeral 31 denotes an impedance conversion element composed of a field effect
transistor accommodated in the cylindrical container 11. 2 and 3 are impedance conversion
element leads. Reference numeral 32 denotes an output terminal of the lead 2 of the impedance
conversion element, and reference numeral 33 denotes an output terminal of the lead 3 of the
impedance conversion element. Both output terminals pass through the insulating plate 28 and
project to the outside. The impedance conversion element 31 is also electrically connected to the
back electrode 18. A solder connection portion 4 electrically and mechanically connects the lead
wire 2 and the output terminal 32 and a solder connection portion 5 electrically and
mechanically connect the lead wire 3 and the output terminal 33.
[0004]
The electret diaphragm 15 and the back electrode 18, which form the electret condenser, are
inserted into the cylindrical container 11 in this order in order to explain the construction and
assembly order of the electret condenser microphone briefly. An assembly in which the
impedance conversion element 31, the insulating plate 28, the output terminal 32, and the
output terminal 33 are integrally connected is configured. Next, after the impedance conversion
element 31 and the back electrode 18 of the above-described assembly are electrically connected
in a state in which the cylindrical back electrode holder 21 is accommodated in the cylindrical
container 11, the entire assembly is housed in the cylindrical container 11. To accommodate.
Here, the insulating plate 28 is pressed to the front plate 12 side by caulking the rear end
portion of the cylindrical container 11, and each of the above-described elements eventually
becomes the insulating plate 28 and the front plate 12 of the cylindrical container 11. It reaches
to be clamped and fixed between.
[0005]
In the electret condenser microphone configured as described above, the output terminal is
inserted into the wiring board and the output terminal is soldered to the wiring of the wiring
board
[0006]
In this electret condenser microphone, the output terminal 32 and the output terminal 33 are
inserted into the wiring board and the output terminal is soldered to the wiring of the wiring
board. The solder of the solder connection portion 4 and the solder connection portion 5 at the
root of the output terminal 33 is melted by the heat of soldering between the output terminal
and the wiring of the wiring board, and connected to the output terminal 32 and the output
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2
terminal 33 There is a risk that the electro-mechanical connection with the impedance
conversion element 31 may be broken.
[0007]
This invention provides an electret condenser microphone that solves the problems as described
above.
[0008]
An output terminal element 50 is provided which comprises impedance conversion element lead
terminals 2 and 3 protruding through an insulating plate 28 and which comprises a pair of
opposing output terminals 52 and 53. The tip of the output terminal is bent to form bent
portions 55 and 56, and the bent portion is formed with a slit 57 fitted to the lead terminal, and
the lead terminal 2 and 3 is fitted to the slit 57 of the output terminal At the same time, the tip of
the lead terminal is bent to form the terminal holding portions 60 and 61 for holding the output
terminal, and the terminal holding portions 60 and 61 are soldered 70 between the output
terminal and the lead terminal to cut the output terminal element 50 To construct an electret
condenser microphone characterized by the above.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described with reference to FIGS. 1 and 2. FIG.
In FIG. 1, reference numeral 11 denotes a cylindrical container of an electret condenser
microphone, which is made of, for example, an aluminum thin plate.
An impedance conversion element including an electret capacitor and a field effect transistor is
accommodated in the cylindrical container in the same manner as the above-described
conventional example.
An insulating plate 28 is pressed by caulking the rear end of the cylindrical container 11 to seal
the rear end of the cylindrical container 11.
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This point is also the same as the conventional example. Reference numerals 42 and 43 denote
metal films formed on the surface of the insulating plate 28. As illustrated, the metal film 42 is
radially extended by four films, and the extended tip is in contact with the crimped rear end of
the cylindrical container 11. As illustrated, the metal film 43 is formed so as to be isolated on the
surface of the insulating plate 28 and is not in contact with the cylindrical container 11.
[0010]
Here, 2 and 3 are lead terminals of the impedance conversion element. The lead terminal 2 and
the lead terminal 3 do not have a solder connection part in the middle unlike the abovementioned conventional example, and they are projected through the hole formed in the
insulating plate 28 by extending as it is from inside the impedance conversion element body. It is
a thing. When protruding through, the lead terminal 2 which is one of the lead terminals
penetrates the metal film 42, and the other lead terminal 3 protrudes through the metal film 43.
[0011]
Referring to FIG. 2, this is a diagram for explaining the output terminal element. 2 (a) is a front
view, FIG. 2 (b) is a side view, and FIG. 2 (c) is a top view. Reference numeral 50 denotes an
output terminal element in which slits fitted to the two lead terminals of the impedance
conversion element are formed at both ends. The output terminal element 50 is composed of a
pair of output terminals 52 and output terminals 53 and a coupling portion 54 for integrally
coupling them. The tip end portions of the output terminal 52 and the output terminal 53 are
bent by 90 ° from the terminal body to form bent portions. 55 and 56 indicate bends. The bent
portion 55 is formed with a slit 57 into which the lead terminal 2 is fitted, and similarly, the bent
portion 56 is formed with a slit 58 into which the lead terminal 3 is fitted.
[0012]
Here, the method of coupling the lead terminal and the output terminal according to the present
invention will be described. FIG. 1 (a) shows the output terminal element 50 and the electret
condenser microphone immediately before it is connected. Here, in a state where the pair of
output terminals 52 and output terminals 53 of the output terminal element 50 are pressed
toward each other, the slits 57 and the slits 58 are fitted to the lead terminals 2 and 3 protruding
through the insulating plate 28. And release the pressure. By doing so, the positioning and
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mounting operation of the output terminal of the electret condenser microphone with respect to
these lead terminals becomes easy.
[0013]
In FIG. 1 (b), in a state where the output terminal is positioned and attached to the lead terminal
as described above, the output terminal 52 and the output terminal 53 are securely held by
bending the lead terminal 2 and the lead terminal 3 respectively. It fixes and comprises the
terminal holding parts 60 and 61. FIG. By doing this, the mechanical coupling between the lead
terminal and the output terminal is complete.
[0014]
FIG. 1 (c) shows the soldering 70 and 71 applied to the terminal holders 60 and 61 completely
mechanically coupled as shown in FIG. 1 (b). This soldering is performed between the lead
terminal, the output terminal, and the metal film, whereby the electromechanical coupling at the
terminal holding portion is completely secured. FIG. 1D shows the connection terminal 54 cut
away from the output terminal element 50. At this point, the installation of the output terminal is
complete.
[0015]
As described above, the output terminal of the electret condenser microphone is connected to the
wiring substrate by participating in the mechanical fixing of the output terminal of the electret
condenser microphone, in particular, the lead wire of the impedance conversion element
comprising the field effect transistor. It is possible to prevent the heat from breaking the electromechanical connection between the output terminal and the element when soldering to the
wiring of FIG.
[0016]
Then, by forming the lead wire fitting slit of the field effect transistor in the output terminal of
the electret condenser microphone, the positioning operation of the output terminal of the
electret condenser microphone with respect to the lead wire of the field effect transistor becomes
easy.
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Electret condenser microphones are extremely small, with external dimensions on the order of a
few mm, and the task of locating the output terminals of such ones has been very difficult, but
this invention makes this easier .
[0017]
Further, the electret condenser microphone of this invention is for connecting the output
terminal to the microphone body at the end of the manufacturing process. This output terminal
connection method can be applied to an ordinary electret condenser microphone not having an
output terminal, and this can be easily changed to an electret condenser microphone with an
output terminal.
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