JPS5023962

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DESCRIPTION JPS5023962
■ Volume control device in 4-channel stereo playback device ■ Japanese Patent Application No.
45-93012 [phase] Application No. 45 (1970) October 21 @ Inumaru Hiroshi-Kadoma city Ogata
Kamonshin 1006 Matsushita Electric Industrial Co., Ltd. Uchido Yukiko Sugimoto Same director
Yoji Hara @ applicant Matsushita Electric Industrial Co., Ltd. Kadoma city bold bold 1006 [share]
agent patent attorney Toshio Nakao 1 person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the relationship between a
listener and a speaker in a 4-channel stereo playback device, FIG. 2 is an electrical connection
diagram of a volume control device in the 4-channel stereo playback device of the present
invention, and FIG. FIG. 4 is a perspective view showing an embodiment of a sound volume
adjustment device in the 4-channel stereo reproduction device of the present invention, and FIG.
4 is an exploded perspective view of the device.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a volume control
apparatus for use in a so-called four-channel stereo reproduction apparatus in which a pair of left
and right speakers are respectively disposed in front of and behind a listener to simultaneously
listen to sound emitted from four directions. The purpose is to enable effective control of the
volume from four directions. In general, a 4-channel stereo playback apparatus is known in
which a pair of left and right speakers are disposed in front of and behind the listener,
respectively, so that voices from four directions can be simultaneously heard. Each volume
control device was attached to each channel, and it was very difficult to adjust the volume
[111111] on the left, right, front and back. The present invention eliminates the abovementioned conventional drawbacks, and is configured such that the volume of left, right, front
and back can be adjusted independently or interlockedly by one volume adjuster linked to each
channel, and the adjustment is extremely simple. And it is configured to be clear. Hereinafter, the
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volume control device in the 4-channel stereo reproduction apparatus of the present invention
will be described with reference to the drawings of one embodiment. FIG. 1 shows the
relationship between a listener and speakers in a 4-channel stereo playback apparatus, in which
1 is a listener, 2 is a left front speaker provided on the front left side of the listener 1, 3 is a
listener A front right speaker provided on the front right side of 1, a rear left speaker 4 provided
on the rear left side of the listener 1, and a rear right speaker 5 provided on the rear right side of
the listener 1. FIG. 2 is an electrical connection diagram of the volume control device in the fourchannel stereo reproduction apparatus of the present invention, in which 6.7 and 8.9 are left
front channels corresponding to the above-mentioned speakers 2.degree. It is an amplifier that
amplifies signals of the front right channel, the rear left channel, and the rear right channel. And
10, 11 ° 12.13 are variable volume adjusting variable resistors connected to each other on the
output side of the amplifiers 6, 7 and 8.9, respectively. It is a variable resistor for volume control
interlocked with. The variable terminals 14, 15, 16 and 17 have their sliding terminals grounded,
and both sides of the resistor are between the front left channel and the front right channel,
between the rear left channel and the rear right channel, and the front left channel. And the rear
left channel, and between the front right channel and the rear right channel. And between the
connection point a5bjC) d between the variable resistor 14.15 and each channel, the connection
point e2g, f, h between the variable resistor 16.17 and each channel, and a buffer resistor for
each channel 1B, 19 ° [111111] EndPage: 120, H is connected.
In FIG. 2, in the case of adjusting the overall volume, the variable resistor 10.2. If you operate
lL12 and 13, it is ugly. When the left, right, front and back are balanced, the variable resistors
14, 15, 16 and 17 are operated. Now, when the sliding terminals of the variable resistors 14 and
15 are shifted to the left channel (or right channel) side, the load in the left channel (or right
channel) increases (or decreases) and the volume of the left channel (or right channel) Decreases
(or increases) and the volume in the right channel (or left channel) increases (or decreases).
When the sliding terminal of the variable resistor 16.17 is shifted to the front channel (or back
channel) side, the load in the front channel (or back channel) increases (or decreases) and the
back channel (or front) As the load on the channel decreases (or increases), the volume of the
front channel (or rear channel) decreases (or increases), and the volume of the rear channel (or
front channel) increases (or decreases). Therefore, by arranging the variable resistor 14.15 and
the variable resistor 16.17 at an angle of 90.degree. To each other and connecting the two, the
volume of each channel is directly set at a position on one operation axis. The volume control of
each channel is also extremely easy. 3 and 4 show an embodiment of the volume control
apparatus in which the variable resistor 10, IL12, 13 and the variable resistor 14.15 variable
resistor 16.17 in FIG. 2 are effectively coupled to each other. In the figure, 22 is a mounting
substrate, 23 and 24 are one side plates facing each other, and 25. 26 are other side plates
facing each other. The variable resistors 14 and 15 are attached to one bending piece 23, and the
variable resistors 16.17 are attached to the other bending piece 25. Reference numeral 21
denotes an arc-shaped connecting piece pivotally connected to one of the bent pieces 23.24, and
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one end of the connecting piece 21 is fixed to the rotary shaft of the variable resistor 14, 150.
The reference numeral 28 denotes an arc-shaped connecting piece pivotally mounted between
the other bending pieces 25 and 26. One end of the connecting piece 28 is fixed to the rotation
shaft of the variable resistor 16.17. The reference numeral 29 denotes an operation shaft
pivotally mounted such that the central portion thereof can be moved so as to slide in the central
portion of the mounting substrate 22, and an operation button 32 is attached to one end thereof.
The connecting pieces 27 and 28 are respectively formed with grooves [111111] 30.31 in the
longitudinal direction, and the other end of the operation shaft 29 penetrates the grooves 30 and
31 to form the variable resistor 10. . It is coupled to the rotational axis of lL12,13.
Therefore, when the operation button 32 is rotated as indicated by arrow A, the overall volume
can be adjusted, and when it is operated back and forth, as shown by arrows B and C, the
connecting pieces 27 and 28 are respectively pivoted shafts 33, Turning around 34, the variable
resistors 14, 15 and 16 ° 17 will be driven respectively. And, in this case, the variable resistors
14, 15 and 16, 17 are adjusted to the respective values by the inclination direction of the
operating shaft 29 and the inclination amount thereof, so the above-mentioned resistors 14, 15,
16 are adjusted by the position of the operation button 32. , 17 becomes clear, and in the end,
the balance state of the sound volume in the 4-channel stereo reproduction apparatus is
displayed at the position of the operation button 32. Further, the variable resistor 10 is formed
with projecting pieces 35 and 36 so that the main body does not rotate together when the
operating shaft 29 rotates, and this projecting piece is inserted into the cut groove 30 in one
connecting piece 27 It is done. A semispherical recess 37 formed on the mounting substrate 22
as means for pivotally connecting the operation shaft 29 so as to be able to move freely, and a
steel ball 38 rotatably inserted into the recess 37 and having a through hole at its central portion
And a hemispherical cover 39 attached so as to cover the steel ball 38. As described above,
according to the present invention, the balancing variable resistors, both ends of which are
connected between the channels and whose sliding terminals are grounded, are disposed at an
angle of 90 ° to each other. Attached to the rotary shaft are semicircular arc-shaped connecting
pieces that rotate around this rotary shaft, respectively, and a longitudinal cut groove formed in
these connecting pieces for the operation shaft pivotally mounted so as to be movable And the
operation shaft is directly connected to the rotary shaft of the volume control variable resistors
connected to the respective channels and further connected to each channel. And the projecting
piece formed on the volume adjusting variable resistor is inserted into and connected to the
groove of the connecting piece, and the entire volume can be adjusted by rotating one operation
axis, Besides, the above-mentioned operation axis is moved All operations can be performed with
one operation axis, for example, it is possible to balance the left and right and front and back
individually by the operation, and the operation is also [111111] EndPage: 2 easy, the state of
balance is also the operation axis It has many advantages, such as the degree of inclination of
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