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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway perspective view of an electret
microphone according to an embodiment of the present invention, FIG. 2 is a sectional view of
the same, and FIG. 3 is a perspective view of a fixed electrode of the same electret microphone.
1.1 'и и и и и и и и Fixed electrode, 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Electret ,
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и spacer, 9 и и и vibrating membrane, 10 и и и
ring. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electret
microphone using an electret on the fixed electrode side. O A conventional Puno 7 juple-type
electret microphone has an electret provided on both sides of one electrode plate to provide a
fixed electrode. The fixed electrode is interposed between two vibrating membranes via an air
gear tube to make a mini-whip. , 91 are configured. 2 However, in the above-described
conventional push-pull type electret microphone, since the fixed electrode in which the electret is
provided on both sides of one electrode plate is used, the following problems occur. When
electrets are polarized (charged), the electrets are provided on the electrode plate. In the abovedescribed conventional example, since the insulating layers of the electret are provided on both
sides of one electrode plate, the electrode plates are grounded. It is difficult to do so and can not
be polarized stably. In addition, in the assembly after polarization, in order to preserve the
potential of the electret without attenuation, the fixed electrode provided with the electret on
both sides of the electrode plate is wrapped with a conductive foil, and this conductive foil is kept
in contact with the electrode plate Although it is necessary, since the insulating layer of the nick
tread is provided on both sides of the electrode plate, it is difficult to establish conduction
between the conductive foil and the electrode plate, and when taking out the fixed electrode from
the conductive foil during assembly, Since the conduction with the electrode plate is insufficient,
a discharge occurs and the surface potential force of the electret) is attenuated. The present
invention eliminates the above-mentioned conventional drawbacks, and one embodiment of the
present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2,
1.1 'is a disk-shaped fixed electrode, and as shown in FIG. 3, each of the fixed electrodes 1.1' is
formed with the through hole 2 and the outer periphery It is comprised from the electrode plate
4 in which the processus | protrusion 3 for positioning was formed in the part, and the film-form
electret 6 provided in the single side | surface of this electrode plate 4. FIG. The through holes 2
of the electrode plate 4 of the electret 5 are opened. Reference numeral 6 denotes a cylinder
made of an insulating material, and a groove 7 is formed on the inner peripheral surface of the
cylinder 6. The two fixed electrodes 1.1 'are accommodated in the cylindrical body 6 so that the
electrode plate 4 is in contact. The projections 3 of the electrode plate 4 are inserted into the
grooves T of the cylinder C, and are positioned such that the through holes 2 of the two electrode
plates 4 communicate with each other. Reference numeral 8 is a ring-shaped spacer, 9 is a
vibrating membrane having an electrode formed on one side by vapor deposition or the like, and
this vibrating membrane 9 is bonded to a metal ring 10, and the above space, + ') + 1 ( Child-.
The ring 10 is disposed on the fixed electrodes 1 and 1 'in the cylindrical body 6 to constitute a
pnun-u-ple type electret microphone. The microphone output is obtained from between the rings
10. The main idea is that the fixed electrode is composed of two electrode plates provided with
electrets on one side, so there is no insulating layer on one side of each electrode plate. The plate
can be easily grounded and can be polarized stably, and the conductivity between the conductive
foil and the electrode plate is sufficient even when it is stored by being wrapped in a conductive
foil after the polarization and the surface potential of the electret is also attenuated. Further, it
has an advantage that no discharge occurs when the fixed electrode is taken out of the
conductive foil for the purpose of assembly, and the surface potential of the electret is not
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description, jps5513491
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