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JPS5394118

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DESCRIPTION JPS5394118
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a microphone device
in which a conventional self-polarizing electrostatic microphone capsule and an impedance
converter are integrated, and FIG. 2 is 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 selfpolarizing electrostatic microphone according to an embodiment of the present invention, and
FIGS. 7 and 8 are plan views of one component. DESCRIPTION OF SYMBOLS 1 ииии Diaphragm, 13
иииии Electrode и 9 иии Impedance converter, 10 иии Insulating layer, 11 иии Bonding material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-polarizing
electrostatic microphone and is intended to be easy to manufacture. A cross-sectional view of a
conventional integrated self-polarizing electrostatic microphone is shown in FIG. The diaphragm
1 is made of a self polarization type so-called electret day molecular film, and an electrode 3 is
provided via a spacer 2 on the back side of the diaphragm 1. The electrode 3 and the insulator 6
form a space of 317 V // 2. 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 in the back air chamber 4 and this input The
terminal 5 b is connected to the electrode 3 directly or through another conductor, and the other
terminal is connected to an external circuit through an @ conductor 6. In the figure, 7 is a spacer,
and 8 is a case. In this case, since the shape of the impedance converter 6 is provided with all the
terminals in the same direction in FIG. 2, among these terminals, the input terminal 6b and the
other output terminal 6a. Although it is necessary to shape 6C in the opposite direction, the
shaping process is complicated and inconvenient in measuring the self-assembly of the assembly.
Here, as shown in FIG. 6, using an input terminal eb and output terminals sa and sc in the
opposite direction: C as shown in FIG. The terminal 9b can be connected to the electrode 3 and
assembled as shown in FIG. 3 by bending the box 3 in the direction of 90 ░, and automatic
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assembly is easy. However, in this case as well, the position of the electrode 3 must be performed
by the insulator 6. Therefore, if an insulating layer is provided at a position where it can be easily
joined to the case 8 at least, position control at the insulator 6 will not be necessary, but if this is
not the case, the relationship between the peripheral portion of the electrode 3 and the
diaphragm 1 From this point on, the stray capacitance loss is overdue, and the deterioration at
high frequencies is remarkable. The present invention: With these defects eliminated, an
embodiment of FIG. 6 will be described below: 1.2.7 to 9 consist of the same ones as in FIG. 1 to
FIG. As shown in Fig. 13, the diameter of the tip is larger than that of the insulator 14 side. In this
case, although 13 may be formed as shown in FIGS. 7 and 8, the effective diameter of the
diaphragm 1 corresponds to the diaphragm 1 side of the electrode 13. An insulating layer 1o is
provided on the outer periphery of the small portion of the electrode 13 to prevent a negative
coupling with the case 8, and 11 is a bonding material made of a conductive elastic body and the
electrode 13 of the terminal 9b. When the case 8 is crimped or sealed, the force in the direction
of the electrode 13 applied to the converter 9 absorbs the deformation of the terminal 9b.
Reference numeral 12 denotes an insulator which forms the back air chamber 4 together with
the electrode 13. The upper surface is simply a plane. 14 is a protective plate. That is, since the
diameter of the prior art knee i 13 is smaller than that of the diaphragm 1 and the insulator 12
side is smaller than that of the diaphragm 1, the effective area of the diaphragm 1 can be made
to correspond. Further, since the insulating layer 10 is provided, the position control by the
insulator 12 is not required and automation is easy. Furthermore, since the terminal 9b and the
electrode 13 are bonded by the bonding material 11, it is possible to prevent deformation of the
terminal 9b at the time of automatic assembly, and it is unnecessary to fix (bond) with solder etc.
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