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DESCRIPTION JPS5663194

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DESCRIPTION JPS5663194
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a conventional
speaker, and FIG. 2 is a cutaway perspective view of the speaker of the present invention. 6 · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · vibration source.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker in
which a plurality of projections are provided radially or concentrically on the inner wall of a
frame to prevent the characteristic noise due to the reflected sound generated between the
diaphragm and the frame. is there. The conventional loudspeaker is configured as shown in FIG.
That is, the disk-shaped piezoelectric vibrator 3 is disposed on the support projecting piece 2 at
the inner bottom portion of the frame 1 made of synthetic resin or the like, and the cone-shaped
diaphragm 4 is disposed at the center of the upper surface of the piezoelectric vibrator -13. The
central part of the diaphragm 4 is attached, the peripheral part of this diaphragm 4 is attached to
the peripheral part 23 of the frame 1, and the sound absorbing material 6 such as Fell The sound
reflected from the diaphragm 4 and the sound reflected from the frame 1 are attenuated to
flatten the sound pressure frequency characteristics. However, in this configuration, a process of
attaching the sound absorbing material 5 to the frame 1 is required, which requires time and
effort for assembly, and has a disadvantage of being disadvantageous in cost. The present
invention eliminates the above-mentioned conventional drawbacks. Hereinafter, an embodiment
of the present invention will be described with reference to FIG. A frame 6 is made of a synthetic
resin or the like, and a plurality of radial projections are formed on the inner side wall of the
frame 6. The protrusion 7 has a height not in contact with the diaphragm. The peripheral portion
of a cone-shaped diaphragm 8 is coupled to the peripheral portion of the frame 6, and the
piezoelectric vibrator 9 is coupled to the central portion of the diaphragm 8 in a −5 direction.
The lower surface of the piezoelectric vibrator 9 can also be supported by a support projection
provided integrally with the frame 6. In the above embodiment, the piezoelectric vibrator 9 is
used as a vibration source. However, the vibration source may be a magnetic circuit and a voice
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coil. Furthermore, a plurality of protrusions 7 may be provided concentrically. As described
above, since the speaker of the present invention is configured, the reflected sound from the
diaphragm and the reflected sound from the inner wall of the frame are irregularly reflected by
the ridges, and the acoustic resistance of the gaps between the respective ridges It is possible to
reduce the dips and peaks in the sound pressure frequency characteristic and to make it a 乎 特
性 characteristic by damping it, and since this ridge can be formed simultaneously at the time of
molding of the frame, it does not require time and effort for assembly. This protrusion can
improve the mechanical strength of the frame, and the thickness of the frame can be reduced
accordingly to make it possible to reduce the weight of the entire speaker, which is of practical
value. It will be a dog.
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