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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a conventional diaphragm, FIG.
2 is a cross-sectional view showing a case where the diaphragm is attached to a case, and FIG. 3
is a case where the diaphragm is attached to a yoke FIG. 4 is a plan view showing an embodiment
of the present invention. 1 ····························································································· Voice coil 3. ······ Case
DETAILED DESCRIPTION OF THE INVENTION The fourth proposal relates to a diaphragm in an
electrodynamic electroacoustic transducer such as headphones and a microphone. Headphones
or one? The swing plate of an electrodynamic electroacoustic transducer such as an ikirophone is
manufactured in a circle with a ・ · 0 thin flossinoc film, and is attached by sticking its outer
peripheral portion to a case or a yoke. This will be described with reference to the drawings.
First, in FIG. 1, 1 is a diaphragm. This swing / l //-movement 1j1 is made of, for example, a
plastic film having a thickness of about 25 to 50 microns, and from its central part 1a toward the
outer peripheral part 1b, the central part 1a ** It is a book provided with a large number of riblike ribs 1C. The voice coil 2 is attached to the lower surface of the central portion 1a of the
moving plate 1 (see FIG. 2). When the diaphragm 1 is attached to a case or a yoke, the voice coil
2 is positioned in the outer periphery of a magnet described later and in an annular gap formed
by a ring-shaped yoke. In FIG. 2, reference numeral 3 is a case molded of a coating oil, and is a
yoke made of 4 t metal parts. The case 6 and the yoke A are U-shaped in cross section, and a
ring-shaped yoke 5 is attached to the opening. Then, with these central sKu magnets 6 attached 6
° in this structure, the outer periphery s1 b of the imaging plate 1 is mounted from the case 3
on the upper surface of the side portion 3 a formed on the inner periphery and positioned After
that, the adhesive diluted with solvent 19 is dropped onto the outer periphery z1) portion 1b,
and the solution is transferred to the entire periphery by capillary action, and the solution j of the
side 5a of the case 3 is joined. In the case of FIG. 5 having the shape, the ring portion C 18 is
formed with an 18i portion, and the outer peripheral portion 1b of the outer ring portion ′ ′,
a ′ ′ vibration + Ii 1 is mounted and joined. In this case, V this is the outside of the yoke 5 flii
draw 5a (pre-divided with the pre-diluted 會 會 會 會 、 後 こ の こ の こ の こ の 同 様 同 様 同
様 同 様 同 様 同 様 同 様 同 様 同 様 同 様It will be joined with diluted adhesive. In any of these
cases, if the outer peripheral portion 1b of the diaphragm 1 is not a half surface in any of these
cases, a defective connection will occur. Particularly in recent years, there is a tendency for the
thickness of the diaphragm 1 to become thinner (for example, 12 to 2 [one micron diameter]) K
for the purpose of improving the performance of headphones and microphones, and variations in
molding due to this. In particular, the plane of the outer periphery s1b can not be maintained,
and the problem is likely to be that waves are likely to strike in the evening.
This is considered to be affected by the temperature variation (3) in the manufacturing of the
diaphragm 1, but in any case, when the outer surface s1b is flat, adhesion and bonding are not
good. It is perfect and can not maintain a predetermined performance. The present invention was
made during this time to solve the apparent fP. When one embodiment of the present invention
is described with reference to FIG. 4, in this case, the outer periphery s1h &, which is the bonding
surface of the diaphragm 1, is concentrically provided with ribs 1d and radial ribs 1f. In this way,
the flow of stains and pilling agent is maintained by the capillary effect of the space of the
portion of the rib 1d, 1f kept flat by the strong effect of 1 (b 1d, 1f (bII @ [Kuna] · n means that
the case or the yoke can be fully force-bonded) VC. The diaphragm is made of a thin material
(plastic film) because it is provided with a radial L and a concentric rib on the outer peripheral
porting face of 5j JI & according to the original plan book 汀 book. Even if it does, adhesion to a
case or a yoke and joining are surely performed, and stable quality can be maintained.