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Description 1, title of the invention
3. Detailed Description of the Invention The present invention relates to a speaker system, and
more particularly to reducing the weight and cost of a loudspeaker. Conventionally, the amplifier
output has to be isolated from the commercial power supply because the loudspeaker is
separated into the speaker and the amplifier that drives it. Therefore, a large power supply
transformer is required, and the increase in the weight and cost of the amplifier can not be
avoided. In recent years, switching power supplies have been incorporated into amplifiers for the
purpose of miniaturizing power supply devices including power supply transformers, but the
efficiency is 70 to 80 channels, and heat generation is neglected particularly in the case of large
power amplifiers. It is not possible, and a considerably large heat dissipation device is required.
This is due to the fact that the amplifier must be isolated from the commercial power supply as
described above. The present invention solves the problems of the above-mentioned conventional
loudspeakers EndPage: 1: It is intended to isolate the entire equipment from the commercial
power supply at the amplifier input end and the output end, that is, the voice coil of the speaker.
It is. Hereinafter, the present invention will be described with reference to the drawings of the
embodiments. FIG. 1 shows an example of the configuration of the speaker system of the present
invention. In the figure, 1 is a power supply circuit that directly rectifies commercial power
supply 8 without using a power transformer, 2 is a circuit that isolates and transmits audio signal
7, 3 is an amplifier, 4 is a speaker outer frame, and 6 is a voice coil. These are integrated with an
amplifier and a speaker as shown by dotted lines. According to this configuration, the commercial
power supply 8 can be completely isolated from the range where the speaker system can be
touched by the human body. Therefore, the insulation by the power supply transformer is not
necessary, and the weight reduction and cost reduction of the loudspeaker system can be
achieved. Fig. 2 shows an example in which the input signal 7 and the commercial power supply
8 are isolated by using an audio transformer. In FIG. 2, the primary and secondary sides of the
transformer 1 are isolated, and the audio signal 7 and the transformer are isolated. Fig. 3 shows
radio waves and light. The example which used the transmission means which used the sound
wave etc. is shown. 11 is a device for modulating radio waves, light, sound waves and the like
with the audio signal 7, 12 is a device for receiving radio waves, light, sound waves and the like
sent by the modulation device 11 and demodulating an audio signal. It is a provider of audio
signals. The power supply to the modulation device 11 can be performed by a battery, a small
power transformer, or the like, and the power consumption is small, which does not contradict
the gist of the present invention. By the way, although the output of the amplifier 3 is isolated,
the voice coil 5 is generally isolated from the speaker outer frame 4. Therefore, it is sufficient to
normally connect the output of the voice coil 4 and the output of the amplifier 3.
The voice coil 5 of the speaker has the possibility that the voice coil 5 of the speaker is often
disjointed or the surface of the voice coil 6 may contact the plate constituting the speaker
magnetic circuit. In such a case, the speaker outer frame 4 and There is a possibility that the
voice coil 5 not insulated from the commercial power supply may be electrically conducted. As a
countermeasure against this, as shown in FIG. 4, there is a method of covering the inner surface
of the magnetic circuit 13 in contact with the voice coil 6 with an insulator 13a such as resin. As
a result, even if the voice coil 6 contacts the plate or the like constituting the magnetic circuit 13,
no commercial voltage is applied to the speaker outer frame 4. FIG. 5 shows the case where an
insulator 13b such as resin is applied to the outside of the magnetic circuit 13. As shown in FIG.
Thus, even if the voice coil 5 contacts the magnetic circuit 13, the human body is prevented from
touching the commercial power supply. FIG. 6 shows an example in which the speaker frame
(outer frame) 4 is made of an insulator such as resin. Given that the speaker is always housed in
the speaker box 14, it is the frame that has the opportunity to come in contact with the human
body in the speaker outer frame, and if this part is made of an insulator, there is no concern
about touching commercial voltage. It disappears. As described above, since the speaker system
according to the present invention does not require a power supply transformer, weight
reduction and cost reduction of the loudspeaker system can be realized.
4, a block diagram showing a brief description of the drawings, FIG. 2, FIG. 3 is a configuration
diagram showing an example of the insulation measures of the input signal, FIG. 4, FIG. 5, FIG. It
is a block diagram which shows an example of the insulation countermeasure of a voice coil. 1 · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·. 3 ...... increase rate
instrument, 4 ...... speaker outer frame, 5 ...... voice coil 7 and old · Input signal source, 8 ......
commercial power supply 11, 11: Modifiable device 12: Demodulation device 13: Magnetic
circuit 13a. 13b · · · · · · · · · · · · · · · · · · · · · speaker box. Name of agent Attorney Nakao Toshio has 1
person EndPage: 2 Figure 1! 2, 4 and 5 EndPage: 3
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