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JPS55165577

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DESCRIPTION JPS55165577
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a speaker provided with a
conventional volume attenuator, FIG. 2 is a front view showing an embodiment of a speaker
according to the present invention, and FIG. FIG. 4 is a front view showing another embodiment.
3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · voice coil, a, b · · · · · · · · speaker input terminal. In
the drawings, the same reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The invention relates to the improvement of a
loudspeaker. Sound pressure level of each speaker in case of forming a system using, for
example, a plurality of speakers in an all band or bass speaker unit handling large input Need to
match. Conventionally, in such a case, as shown in FIG. 1, an L-type attenuator 2 is often used as
a volume control circuit (attenuator) of one speaker l. The attenuator 2 requires a large power
supply in proportion to the desired amount of attenuation, and therefore requires an attenuator 2
having a large allowable input resistance when it is desired to increase the amount of
attenuation. However, conventionally, in such a case, although the resistor 2 having a large
allowable power is externally connected to the speaker 1 as the attenuator 2, the resistor having
a large allowable power is expensive and has a large allowable power. The resistors are often of a
wire-wound type, and the wire-wound resistors have an adverse effect in terms of noise, and
further have disadvantages such as poor heat dissipation of the resistors. This device can be
made K to eliminate the above-mentioned drawbacks, and a large sound volume attenuator with
a large allowable input is easily provided, and the sound quality is good, the heat radiation effect
of the volume attenuator is large, and the vibration is further increased. An object of the present
invention is to provide a speaker of great practical value that can also obtain a braking effect on
the plate itself. An embodiment of the present invention will be described below with reference to
FIGS. 2 to 4. FIG. 2 is a front view showing an embodiment of the speaker according to the
present invention, and FIG. 3 is a perspective view showing the main part of the same, wherein 3
is a diaphragm and 4 is a resistor forming a volume attenuator. Body, 5 is a pois coil. Further, a
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and b are speaker input terminals, C is an intermediate connection portion, and these are
equivalent to a to C in FIG. That is, in the present invention, a resistor 4 is formed on the surface
of the diaphragm 3 as a volume attenuator, and a speaker input terminal a is connected to the
voice coil 5 through the resistor 4. b is derived. In this case, paper is generally used as the
material of the diaphragm 3 in many cases, but here, from the viewpoint of heat resistance, GFRP
(Glasss-FiberRa1forcedPlastics) or carbon fiber made by solidifying glass fibers with an epoxybased binder is used. A CFRP (Carboa-FiberRaInforcedPlasties) formed by solidifying fibers with
an epoxy binder was used. Also, in the embodiment of the present invention, a metal glaze
resistor, for example, ruthenium oxide (Rub) @ is used as the resistor 4 and this is coated on the
diaphragm 3 made of GFRP or CFRP to form the necessary layer. I get resistance value.
At this time, if the diaphragm 30 divided vibration mode is detected in advance and the resistor 4
is attached to the portion where the divided vibration is suppressed, a flat response can be
obtained, and the natural sound of the diaphragm 3 is also damped. It is possible to have an
effect. Note that FIG. 4 exemplifies the case where the resistor 4 is attached to the center cap 6 of
the speaker, and attenuates multiple inputs by connecting the speaker input terminals in series
between a and b in the figure. It is possible to As described above, according to this invention, the
resistor 4 is formed on the surface of the diaphragm 3 as a volume attenuator, and the speaker
input terminals a and b are derived from the voice coil 5 through the resistor 4. Since it has been
made to do, it is possible to easily provide an acceptable human power O 奄 41 large volume
attenuator, and the sound quality is stormy, the heat radiation effect of the volume attenuator is
large, and further the braking effect of the diaphragm 3 can be obtained. There is.
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