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DESCRIPTION JPS53138825

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DESCRIPTION JPS53138825
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker for
sound reproduction. FIG. 1 is a cross-sectional view of the conventional speaker (only the left half
is shown). In FIG. 1, 2 is a center port. A pack plate having a ring 1, an annular front plate 4
serving as the other magnetic pole, and a hack pre. 1・l・! 3)-) · · · An annular magnet 3 is
provided between the front plate 4 and the front plate 4 and the magnetic circuit of 1 to 4 above.
Form. Also, 12 is a frame attached to the upper surface of the front plate 4 °, and 10 is a frame.
The diaphragm 12 is held 5 by the upper end outer peripheral portion of the frame 12 and the
arrow paper 13, and 7 is a voice coil bobbin adhesively fixed to the central hole of the diaphragm
lO. マタ。 A voice coil 6 is wound on a voice coil bobbin 7, and a damper 8 supports the voice
coil bobbin 7. , 9 is a center camp, 5 is a sound absorbing material such as a sponge-like
synthetic resin 1) or glass wool. In the above speaker, input power is large. The voice coil 6
generates heat when it gets loud, but the heat is absorbed by the magnetic circuit. However, in
the conventional speaker, the sound absorbing material 5 is used. Ponce-like synthetic resin,
glass wool, etc. were used. Because of the poor heat dissipation from the parts, especially large.
When the amplitude of the voice coil 6 is increased manually and the voice coil 6 is moved
upward (diaphragm side), the heat absorber disappears, so the voice coils 2 and 1 and 2. The
heat dissipation of 11-il 6 will be insufficient and speed from this point. The upper limit of force
input is limited and the allowable input is lowered. There were seven drawbacks. The reason for
providing the sound absorbing material 5 is the center pole 1 and the voice coil bobbin 7. This is
for reducing the magnitude of the air 5 resonance in the space partitioned as the communication
can 9. The present invention is a sponge in order to eliminate the above drawbacks. It is an
object of the present invention to provide a speaker having an improved allowable input by using
a metallic metal sound absorbing and radiating member. とする。 The present invention will be
described in detail below based on the drawings. . FIG. 2 is an embodiment of the present
invention. In FIG. 2, 14 is a sponge-like metal sound absorbing and radiating member, and 15 is a
dome-shaped diaphragm, and the same reference numerals as in FIG. In the embodiment of FIG.
2, since the sound absorbing and radiating member 14 uses a sponge-like metal, from this
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portion. The heat dissipation of heat will be better, and it will also be voiced at large input. Even
when the coil 6 moves upward, since it is in the vicinity of the sound-absorbing and heatdissipating member 14, a boy 2. . !
Since the heat of the 1 · 3 · 1 coil 6 is dissipated, the voice coil 6 is not overheated, and the
allowable input can be increased. In the embodiment of FIG. 2, dome-shaped vibration. The case
where the plate 15 is used is exemplified, or the same effect can be obtained even in the case
where the normal diaphragm 10 and the center cap 9 are used as shown in FIG. In addition, since
the sponge-like metal is also excellent in sound absorption, the effect as a sound absorbing
material can be sufficiently exhibited. る。 As the sponge-like metal, for example, as shown in f.
ときものかある。 Iron, nickel, etc., as magnetic material, copper, aluminum, titanium, etc. as
nonmagnetic material. である。 Next, FIG. 3 is a view showing another embodiment of the
present invention, showing the case where the present invention is applied to an inner magnetic
type magnetic circuit. In FIG. 3, 1 'is a pole piece, 2' hahanonupure-), 3 'is a bar? グネノト、
4′はフロンドブ。 Rate 14 is a sponge-like metal sound-absorbing material. ある。 Note that
the voice coil and diaphragm are not shown; . 1・4・11でいる。 Next, FIG. 4 shows a case
where a magnetic material “sponge-like metal is used and a non-magnetic material spong as the
sound absorbing and radiating member 14. The figure which shows the flow of a magnetic force
line with the case where dimetal is used. である。 In FIG. 4, the solid line 16 indicates the "flow
of magnetic lines of force when using a nonmagnetic material, and the broken line 17 indicates
that a magnetic material is used. The same reference numerals indicate the same things. As can
be seen from the broken line 17 in FIG. 4, the asymmetry of the upper and lower magnetic flux
density is improved when the magnetic stron) metal is used, so the linearity at the time of large
amplitude of the voice coil is improved. Be done. Next, FIG. 5 is another embodiment of the
present invention. The embodiment of FIG. 5 forms a sponge-like metal. . In this case, a show) Uring portion 18 is provided below the sound absorbing and radiating member 14, and the short
ring portion 18 is disposed in the magnetic gap between the center pole 1 and the front plate 4.
In the embodiment of FIG. 5, a nonmagnetic sponge 1.5. If an 11-like metal is used, the distortion
of the magnetic circuit should be reduced by providing the above-mentioned IJ tongue portion. I
can do it. In addition, show for convenience of molding) + 1 part. Even if it does not become like a
sponge, the effect of the present invention is lost. れない。 According to the invention as
described below, Voiceco. The heat dissipation of the heat generated by Because the heat
radiation effect at the time of width is improved, it is possible to increase the allowable input, and
also the sponge metal of the magnetic body.
If it is used, the asymmetry of the upper and lower magnetic flux density can be improved 1), and
further, if the IJ tongue portion is provided, distortion of the magnetic circuit can be reduced, and
so on, there are many effects.
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