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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show an example of a conventional
complementary electret transducer, respectively. FIG. 1 is a schematic diagram, FIG. 2 is a
partially cut perspective view, FIG. FIG. 3 is a perspective view showing an embodiment of a
complementary electret transducer according to the present invention. 11.12 ... electret fixed
electrode, 31 ° 32 ... fixed electrode, 33.34 ... projection.
DETAILED DESCRIPTION OF THE INVENTION The invention relates to the improvement of a
complementary electret transducer. FIG. 1 is a known complementary electret transducer. Here,
11.12 are positive and negative electret fixed electrodes, respectively, and this electret fixed
electrode 1 / a? ! The movable side electrode 13. A diaphragm 15 is provided via the frame. The
line fixed electrode 11 ° 12 is short-circuited by such a transducer, and a signal 16 is supplied
between the fixed electrode 11.12 and the front-side moving side electrode 13. By the way, in the
above-mentioned conventional transducer, when short-circuiting the electret fixed electrode
11.12, as shown in FIG. 2, the fixed electrode 21.22 is brought into contact with the peripheral
portion of the electret fixed electrode 11.12. Provided and shorted by the lead wire 23.
Therefore, it takes a lot of man-hours to connect the lead f1M23 at the time of assembly, and
furthermore, when this transducer is incorporated into, for example, a headphone, there is a
disadvantage that a space for casting the lead wire 23 or the connection end of the lead wire is
required on the headphone side. There is. The present invention has been made based on the
above-mentioned circumstances, in which elastic fixed electrodes are respectively provided on
the peripheral portion of the electret fixed electrode, and the fixed electrodes are respectively
provided with projections which come into contact with each other in the assembled state. It is
also an object of the present invention to provide a transducer that is simple, can easily and
completely short the fixed electrodes, and has a shape that is shed and does not require extra
space. Hereinafter, an embodiment of the present invention will be described with reference to
the drawings. The same reference numerals as in FIGS. 1 and 2 denote the same parts. 3 differs
from FIG. 2 in FIG. 3 is a ring-shaped fixed electrode 31.32 provided on the periphery of the
electret fixed electrode 11.12. The fixed electrode 31. 32 has elasticity, and protrusions 33 and
34 facing each other are provided on a part of the peripheral edge portion. Then, in a state where
these are positioned and fixed by means of the pins 35.36, the projections 33.34 abut, and the
constant electrode 31.32 and the electret constant voltage lK11.12 are electrically shorted. . Note
that the bin 35.36 is integrally formed with, for example, a headphone unit (not shown).
According to the above configuration, the fixed electrode s1. The fixed electrodes
are short-circuited by abutting the projections 33 and 34 provided with sxK.
Therefore, the conventional connection work with the lead wire is unnecessary, and moreover,
the pin 35.36 integrally formed on the headphone unit in the state where the fixed electrode and the diaphragm 15 are overlapped is deformed by heating. Since it is possible to
connect and fix the reels only by doing this, the number of assembling steps can be significantly
reduced. In addition, since the fixed electrodes 31 and 32 and the projections 33 and 34 have
elasticity, a sufficient contact pressure can be obtained in the projection contact state, and the
contact resistance can be reduced and a necessary short circuit state Can hold Furthermore, since
the shape of the protrusions 33 and 34 can be miniaturized, there is an advantage that the space
necessary for arranging the protrusions 33 and J4 can be narrowed. As described above in detail,
according to the present invention, a complementary electret transducer which is easy to
assemble, can easily and completely fix fixed electrodes, and has a small shape and does not
require an extra base. Can be provided.
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