JPS4960721

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DESCRIPTION JPS4960721
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the principle of the
conventional diaphragm supporting method, FIG. 2 is the principle showing the diaphragm
supporting method of the present invention, and FIG. 3 another embodiment according to the
present invention. The principal part expansion principle figure is shown. 1 diaphragm, 2
armatures, 3 7 drive rods, 4 magnets, 5 yokes, 6V'i coil, 1 is a frame, 8 protective case, 9
dampers, 10 drive rod variant, 11 is A synthetic resin film, 12 indicates the center of the
diaphragm, 13t-j: a clamp. 茅 ■ 一一 45-5 実 49-60721 (2) misery 2 圀 10 5th 46-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for
supporting a diaphragm of an electroacoustic transducer such as a transmitter or a receiver.
When the size of the device is reduced, the sensitivity decreases as the outer diameter of the
diaphragm becomes smaller. It is an object of the present invention to provide a method of
supporting a diaphragm using the properties of a drive rod having an irregular tip shape and an
extremely thin synthetic resin film as effective means for improving the vibration system. FIG. 1
shows the principle of a conventional diaphragm supporting method 1-. The outer peripheral
portion of the diaphragm 1 is supported by a damper 9 having extremely light elasticity,
vertically between the frame 7 and the protective case 8. The central portion 12 of the
diaphragm 1 is fixed by a drive rod 5 coupled to the vibrating element armature 2, and the
magnetic flux of the magnet 4 magnetized in advance generates a DC magnetic flux by using the
yoke 5 and the armature 2 as a magnetic circuit. There is. When an alternating current signal is
generated in the coil 6, a change in magnetic flux occurs between the armature 2 and the yoke 5,
causing the armature 2 to vibrate. According to this method, when the drive rod 6 and the
central portion 12 of the diaphragm 1 are fixed with an adhesive, the diaphragm outer peripheral
portion is lifted by the damper 9 and the armature 2 is easily displaced. It is difficult to set, and it
is necessary to prevent the displacement of the diaphragm by some method until the drying of
the adhesive is completed. As the diaphragm is miniaturized, the plate thickness is required to be
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thin, but the method is also quite manual in manufacturing, and deformation due to handling etc.
is easy to be received, which is not preferable in terms of quality. Fig. 2 illustrates the
embodiment according to the present invention-2 = an example of the tip of the driving rod is a
different shape, when the diaphragm 1 is inserted from the top, the diaphragm y to maintain and
stop a fixed distance with a different shape y Adhesive application to the center 12 is easily
possible, and the 1 = one set relative position is also constant. In this case, the outer diameter of
the diaphragm 1 is slightly smaller than the inner diameter of the frame 7. After fixing, the outer
peripheral portion is covered with 11 on the extremely thin synthetic bark 111 coated with an
adhesive on the diaphragm contact surface side slightly larger than the outer diameter of the
hammer 7 and bonded to the diaphragm 1 at the outer peripheral portion. The film 11 prevents
the movement of the diaphragm 1 in the circumferential direction by bonding the diaphragm 1
fixed only by the central portion 12 with the moistureproof effect with the outside air and the
outer peripheral portion. In addition, since the film is extremely thin, vibration is not suppressed
even at the peripheral portion of the diaphragm. FIG. 3 illustrates another embodiment according
to the present invention, in which the contact surface between the film 11 and the diaphragm 1
is not coated with an adhesive, and the height of the support surface of the frame 7 is increased.
The outer peripheral portion is slightly raised, and the same effect is obtained by the film 11.
6-As described above, according to the present invention, the diaphragm can be easily set at the
relative position by the extremely thin synthetic resin film which doubles as the tip end of the
drive rod and the moistureproof film, rational manufacturing and assembly are possible, and the
cost is low. It is excellent as an effective means for solving the problems in the case of
miniaturizing handsets and the like.
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