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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various video equipment, audio equipment and the like.
2. Description of the Related Art In addition to high sound quality, speakers used in recent video
equipment are required to be miniaturized and slim. A conventional loudspeaker of this type will
be described with reference to FIG. The frame 16 is coupled to the field portion 12 formed of the
yoke 13, the magnet 14 and the plate 15, and the outer peripheral portion of the diaphragm 17
is attached to the peripheral portion of the frame 16. The coil 18 is coupled, the middle portion
of the voice coil 18 is supported by the damper 19, the lower portion of the voice coil 18 is
properly fitted into the field portion 12, and the dust cap 20 is further provided on the upper
surface of the central portion of the diaphragm 17. It was pasted and constituted.
However, in the above-mentioned conventional speaker, when the shape of the diaphragm 17 is
oblong for the purpose of slimming, unnecessary resonance is caused due to the low rigidity of
the diaphragm 17 in the longitudinal direction. It has a problem of generating and generating
harmonic distortion that is harmful to hearing.
An object of the present invention is to solve the above-mentioned conventional problems and to
provide a speaker with high sound quality.
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker according to
the present invention has a voice coil which couples a frame to the upper surface of a magnetic
circuit provided in a magnetic gap and fits in the magnetic gap around the frame. And a hole
provided at a symmetrical position from the center and closed with a visco-elastic material to
connect an outer peripheral portion of the diaphragm.
[Operation] With the above configuration, unnecessary resonance is dispersed and suppressed at
the portion where holes provided at symmetrical positions from the center of the diaphragm are
closed by the visco-elastic material, distortion is reduced, and high sound quality is achieved. A
slim speaker can be realized.
invention will be described below with reference to FIGS.
FIG. 1 is a half sectional view showing the structure of the speaker in the embodiment, and FIG. 2
is a plan view of a diaphragm used for the speaker in the embodiment.
In FIG. 1, the frame 5 is connected to the field portion 1 constituted by the yoke 2, the magnet 3
and the plate 4, and the outer peripheral portion of the diaphragm 6 is attached to the peripheral
portion of the frame 5. The voice coil 7 is coupled to the lower surface of the voice coil 7 and the
middle portion of the voice coil 7 is supported by the damper 8 so that the lower portion of the
voice coil 7 fits into the field portion 1. Is pasted and configured.
Further, as shown in FIG. 2, holes 11 are provided at symmetrical positions from the center in the
longitudinal direction of the diaphragm 6 of this embodiment, and the viscoelastic material 10
completely completes the holes 11 by its own surface tension. It has been applied to block.
With such a configuration, the internal loss of the portion of the hole 11 to which the viscoelastic material 10 is applied becomes large, and the speaker using this diaphragm 6 suppresses
the resonance at a specific frequency, as shown in FIG. Distortion can be reduced as compared
with an oblong speaker using the diaphragm of the above.
As described above, according to the speaker of the present invention, unnecessary resonance
can be dispersed and suppressed even when using an oblong diaphragm, and distortion that is
harmful to the sense of hearing is reduced. It is possible to provide a slim speaker with sound
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