JPS5394619

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DESCRIPTION JPS5394619
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a microphone
apparatus in which a conventional electret condenser microphone capsule and an impedance
conversion unit are integrated, FIG. 2 is an external view of an impedance converter used in FIG.
3 is a cross-sectional view of another device, FIG. 4 is an external view of the impedance
converter of FIG. 3, FIG. 5 is a view showing a part of the manufacturing process of FIG. FIG. 7 is
a cross-sectional view of a partial component according to an embodiment of the present
invention. DESCRIPTION OF SYMBOLS 1 ···· Diaphragm, 3 ······ Electrode · 9 ··· Impedance
converter, 11 ······· Insulating layer, 10 ······· Elastic material.
DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to make it
easy to manufacture an Electle-Leotto capacitor microhore. A cross-sectional view of a
conventional self-polarizing electrostatic microphone is shown in FIG. This is because the
diaphragm 1 is made of a self-polarizing type, so-called electretized polymer film. An electrode 3
is provided via a spacer 2, and a back air chamber 4 is formed behind the space in a space
surrounded by the electrode 3 and the insulator 6. In the back air chamber 4, an impedance
converter 6 (for example, a field effect transistor and an integrated unit having necessary
functions such as a bias resistor and an output resistor and having a shape shown in FIG. 2) is
disposed. The input terminal 6b is connected directly or through another conductor to the
electrode 31 / C, and the Pv other terminal is connected to an external circuit through the
insulator 6. 7はスペーサ、8はケースである。 In this case, it is necessary to shape the
impedance converter 6 in the opposite direction of the input terminal 6b and the other output
terminals ea * eck since all the terminals project in the same direction as shown in FIG. 1, the
shaping process is complicated and inconvenient. Here, the impedance converter 9 has three
input terminals tab and output terminals 9a and 9c in opposite directions as shown in FIG. 4, and
as shown in FIG. 5, the input terminals of the impedance converter 9 are used. By connecting 9b
to the electrode 3 and bending the electrode 3 in the direction of 90 °, the assembly shown in
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FIG. 3 can be assembled and automatic assembly can be facilitated. However, in this case as well,
it is necessary to position the electrode 3 with the insulator 5, which is disadvantageous. Since
the present invention eliminates such defects, the layers 1 to 7 are similar to those of FIGS. 1 to 5
as described in the embodiment of FIG. Reference numeral 3 denotes the whole or the peripheral
portion as the insulating layer 11 as shown in FIG. 7 except the bonding portion of the bonding
material 1o which is conductive with the input terminal 9b and has an elastic action. Reference
numeral 12 denotes an insulator corresponding to 5 VC in FIG. 1, and the upper surface is not
provided with a recess for holding the electrode 3 like 5 and is merely one F-plane. 13 is a
holding plate. That is, when inserting the present invention (d 7. 8 in the order of 7.12 and 3. 9)
in order of 9.12, the insulating layer 11 is used to make the position control of the electrode 3
unnecessary with the insulator 12 sheet. Thus, the electrode 3 and the case 8 are insulated.
Therefore, since the assembly is easy and the connection with the terminal 9b electrode 3 is
made by the elastic member 10, the connection is easy, while the transducer 9 is moved in the
direction of the electrode 3 when the case 8 is crimped or sealed. Even if inserted, the input
terminal of the terminal 9b can be protected by the elastic member 10, which is advantageous.
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