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DESCRIPTION JPS553575

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DESCRIPTION JPS553575
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of the center cap of the
present invention, FIG. 2 is a plan view of the center cap of the present invention, and FIG. 3 is a
frequency-sound pressure characteristic diagram. 1 is a center cap, 2 & aggregate, 3 is a
diaphragm, 4 is an edge, 5 is a frame, 6 is a voice coil.
DETAILED DESCRIPTION OF THE INVENTION The present invention is the structure of a domeshaped center A knob of a speaker. Conventionally, the dome-shaped center cap of the moving
plate for speakers aims at dustproofing, but the dome-shaped center cap is used as a h method to
suppress an avalation near the upper limit of the frequency characteristic caused by divided
vibration. The center part of the thickened part or one-sided or double-sided hot-air felt of the
domed center cap is attached or an adhesive substance is applied to act as a vibration absorbing
material, fl − − e 7 r 2 vibration loss It was added. Since this solution is not an h-direction
solution that uses sound pressure radiation from the center cap (Fig. 3 (as shown by the dotted
line in the case of no measures, Abare occurs near the high frequency range limit. However, in
the case of the dotted line where the center cap ◆ this felt is pasted, or the dead material is
applied, the avalate is eliminated but the drawback is that the sound pressure near the upper
limit has fallen. The fourth plan, which is proposed in order to eliminate the drawbacks of the L,
is illustrated in FIG. 1 and FIG. Near the center of diaphragm 3 where voice coil 6 is attached to
the outer edge of frame 5 so that voice coil 6 can be seen in the center hole (around the center of
one or both sides of dome-shaped center cap 1 fixed) Spray the aggregate 2 in a shape that
conforms to the shape of this circular or star-like vibration mode Q or Cloth to a speaker that was
耐着. This structure (in this case, the center cap is made of natural fiber, synthetic fiber, metal foil
or the like, inorganic powder like tare or kaolin 3 as aggregate, scaly or granular material such as
mica, and natural resin such as Nikona A mixture with a synthetic resin such as vinyl acetate,
alkyd or acrylic resin, or a mixture of inorganic fibers such as asbestos and glass fibers or
organic fibers such as acrylic is used. Since the center cap of the speaker diaphragm according to
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the present invention has the above-described structure, the dustproof effect and vibration loss
material effect are added, and the rigidity in the vicinity of the dome-like top 15 is increased. Fig.
3 (as shown here, the frequency characteristics (here, the solid line (show f! III <, near sound
range limit (Aberration of the frequency characteristic is suppressed without reducing sound
pressure in this case, and the bisto beat region is expanded, and sound pressure of the center cap
is also utilized acoustic energy radiation) You can This invention is below! -As described above,
spraying or applying the aggregate in the shape according to the vibration mode in the vicinity of
the center of the dome-shaped center cap. At the same time (this increases the rigidity of the
vibrating wedge near the dome-like top part, and suppresses the aberration without lowering the
sound pressure near the upper limit of the frequency-sound pressure characteristic O). The
present invention is an improvement device for a center cap of a speaker diaphragm that has a
large practical effect of improving sound quality while expanding a vibration region.
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