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JPS55115791

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DESCRIPTION JPS55115791
Description 1, title of the invention
スピーカシステム
3. Detailed Description of the Invention The present invention relates to a multi-way type speaker
system having a plurality of speakers of different reproduction frequency bands. A speaker
system used for an audio apparatus or the like may be configured using a plurality of speakers
having different reproduction frequency bands for the purpose of expanding the reproduction
frequency band, reducing distortion, improving the allowable input, etc. . A two-way (Wyof)
system consisting of a Woofer for reproducing low-pitched sound and a Tweeter for reproducing
high-pitched sound, and a squaw Three-way systems, including Squawker, are often used. In
these multi-way type speaker systems, one input signal is distributed to each of the speakers and
configured to be driven simultaneously, in order to supply only a predetermined band of signals
to each of the speakers. In many cases, a dipipe ink network comprising an LO filter circuit or the
like is provided to divide an input signal and drive each speaker. In this case, it is particularly
important to balance the reproduction sound pressure levels of the respective speakers, and
when the reproduction sound pressure levels of the speakers in each of the bands are different,
the frequency characteristics of the entire speaker system are degraded, This may interfere with
the reproduction of such signals or increase hearing discomfort. The playback output of each
speaker with respect to the input signal changes according to the value of the voice coil
impedance of each speaker, EndPage: 1 value, and leads to a change in the load of the amplifier
especially when driving one speaker using a transistor amplifier Therefore, it is necessary to
suppress an increase in the impedance of the voice coil due to heat generation and the like.
Further, as described above, in order to maintain the balance of the reproduction frequency
bands of the speaker system, it is particularly important to make the changes in the impedance of
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the voice coil of the speaker of each part uniform. In the conventional speaker system, no
consideration is given to such impedance change of each speaker, and in the case of a small input
signal, that is, the heat generation of the voice coil is small and the output level of each speaker is
not increased. The adjustment of was done. Therefore, when a large input is added when the
speaker system is used and the temperature of the voice coil of each speaker rises, a difference
occurs in the impedance change of each speaker and the output level of a specific speaker rises
or falls. Sometimes I got out of balance.
An object of the present invention is to provide a speaker system capable of always maintaining a
balance of reproduced sound by aligning changes in impedance of voice coils of respective
speakers. In the loudspeaker system according to the present invention, the voice coil and the
magnetic circuit of each loudspeaker constituting the loudspeaker system are configured to
mutually equalize the thermal characteristics. For this purpose, it is necessary for each
loudspeaker to use a suitable means for the uniform dissipation of the voice coil of the respective
loudspeaker. When an input signal is applied to the voice coil of the speaker, Joule heat is
generated by the current flowing in the voice coil. However, particularly when a large power
input signal flows continuously, a large amount of heat is generated. The heat generated in the
voice coil is usually radiated to the portions of the magnetic circuit opposite to it through the air
layer. Heat transferred to parts such as the center pole and the yoke of the magnetic circuit is
transferred to each part of the cis beaker by heat conduction of metal and is released from the
surface of each part to the surrounding air. The temperature rise of the voice coil can be
suppressed by promoting the heat transfer in the heat transmission path as described above, but
in the speaker system according to the present invention, the heat capacity of each speaker
reproducing each signal band For a speaker that is determined to have a value according to the
magnitude of the input signal, or a speaker whose temperature rise is likely to occur due to a
large input signal or a small heat capacity, predetermined means for promoting heat dissipation
may be provided. The temperature rise of each speaker is equalized by enhancing the effect to
other speakers. In the first embodiment of the present invention, the diameter of the voice coil of
each speaker in the system and the size of the magnetic circuit are determined in proportion to
the size of the input signal in each band at the time of sound reproduction. According to this
method, the heat generated in each speaker is released at the same rate, the temperature rise of
the voice coil is equalized, and the difference in the impedance rise of the voice coil at the time of
large input disappears, so that the balance of reproduced sound may be lost. Absent. In the
second embodiment of the present invention, the voice coil of each speaker is made using
different metals. As a result, the heat capacity of the voice coil itself and the emissivity of heat
can be controlled to appropriate values, and the temperature rise can be made uniform. In this
case, it is also possible to equalize the final rise in impedance by using the difference in
resistance temperature coefficient between metals.
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2
In the above two embodiments, each speaker is not provided with a special means for promoting
heat radiation, but the shape and size of the voice coil or magnetic circuit of each speaker is the
same as that of the speaker for the sound reproduction. It is not always possible to give priority
to only the thermal property because the effect on the mechanical performance is large. For this
reason, in the third embodiment of the present invention, among the plurality of speakers
constituting the system, in particular, the one having a large driving power or a small shape of
the voice coil and the magnetic circuit and a small heat capacity is required. Provide heat
dissipation means. As one of the heat radiation means, the bobbin of the voice coil is made of
metal, and the heat radiation can be facilitated by making it black. Also, the method of coating
the surface of the magnetic circuit in black EndPage: 2 color is also possible, thereby increasing
the heat absorption of the part facing the voice coil, ie the center piece and the yoke part, and
further from the surface of each part of the magnetic circuit It can facilitate the release of heat.
Still another heat radiation means may be a method in which fins are formed on a part of the
magnetic circuit, a predetermined heat radiation part and a center piece part of the magnetic
circuit are connected by a heat exchanger such as a heat pipe, or a predetermined fan. There is a
method of providing it and forcing air cooling of the voice coil. In the present invention, any of
the above-mentioned heat radiating means may be used particularly for the speaker having a
strong tendency of the temperature rise of the voice coil, but preferably the above-mentioned
heat radiating means is provided for each speaker constituting the system It is good to control
the temperature rise of the voice coil of all the speakers and to increase the heat dissipation
effect of the speaker where the temperature rise is large to achieve an overall balance by
combining the two. In the speaker system according to the present invention, the temperature
rise of the voice coil of each speaker at the time of large input is equalized and the change in
impedance is balanced by the above method, so that a difference occurs in each band or output
sound pressure In addition to this, it is possible to improve the input resistance characteristics of
the entire speaker system by avoiding that the specific speaker is overheated. EndPage:
3
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