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JPS56114499

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DESCRIPTION JPS56114499
Specification. 1 、 Name of invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a speaker, in which the
acoustic resistance and mechanical resistance are greatly increased by providing a sound
absorbing material between the diaphragm and the frame. Conventionally, in order to increase
the mechanical resistance of the speaker, a paint for dumping is applied to the vibrating portion
of the speaker, or a sound absorbing material is provided in the speaker box to increase the
acoustic resistance. Both have limitations in increasing acoustic and mechanical resistance near
the lowest resonance frequency. When a sound absorbing material is provided in the speaker
box, if the sound absorbing material is filled tightly all over the inside of the speaker box, a large
acoustic resistance can be obtained to some extent, but the material cost of the sound absorbing
material becomes high There are problems such as becoming complicated. The present invention
is to provide a speaker in which the acoustic resistance and the mechanical resistance can be
easily increased with a small amount of sound absorbing material. Hereinafter, an embodiment of
the present invention will be described with reference to the drawings. In the figure, 1 is a center
pole, 2 is a magnet, 3 is a plate, 4 is a voice coil bobbin, 5 is a voice coil, 6 is a damper, 7 is a
diaphragm, 8 is a frame, 9 is an edge, and the configuration up to here is It is identical to the
conventional speaker. And 10 is a sound absorbing material, such as felt, bolster, or cotton,
provided between the diaphragm 7 and the frame 8 and this sound absorbing material 1 o is in
contact with or adhered to the diaphragm 7 0 in this way vibration By directly applying the
sound absorbing material 1o to the plate 7, it is possible to greatly dump frequencies below the
lowest resonance frequency where the amplitude of the vibration plate 7 increases due to the
mechanical vibration resistance of the sound absorbing material 10, EndPage: 1 lowest The
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mechanical resistance below the resonant frequency can be significantly increased. In addition,
the vibration plate itself can be dumped, which is extremely advantageous. In addition, since the
friction when air flows is increased by the sound absorbing material 1o, the acoustic resistance is
also significantly increased. Also, it is better to provide the sound absorbing material 1o closer to
the diaphragm 7, which is a radiation source of sound waves, than to provide the sound
absorbing material on the inner wall of the speaker box, the sound absorption efficiency is high
and the volume of the sound absorbing material 10 is small. Bonding the sound absorbing
material 10 to the diaphragm 7 is advantageous because the sound absorbing material 1o does
not move or come off during vibration or transport. Further, if the sound absorbing material 10
is too small, the mechanical resistance of the diaphragm 7 becomes large, so it is necessary to
consider the filling amount of the sound absorbing material 1 o so as to obtain the acoustic
resistance suitable for the design purpose. Also, in the embodiment, a dedicated frame
incorporated in spew kanyanite is used as the frame 8, but in the case where a part of the cabinet
is also used as the frame, a sound absorbing material may be provided between the cabinet and
the diaphragm. It goes without saying that the present invention is to provide a sound absorbing
material between the diaphragm and the frame, as described above, so that a sufficiently small
amount of sound absorbing material can provide sufficiently high acoustic and mechanical
resistance. The excellent effect of being able to
4. Brief Description of the Drawings The drawings are sectional views showing one embodiment
of the present invention 01 ··· Center pole, 2e · · · · Magnet · 3, · · · · · · · · · · · 4
························································································································· Diaphragm, 8 ··························· · · · · · · · · ·
· · · · · · · Sound absorbing material. Name of Agent Attorney Nakao and 1 other EndPage: 2
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