JPS6312640Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio device, and more particularly to an audio device that outputs an audible sound signal to be applied to a speaker (see, for example, Japanese Utility Model Application Publication No. 173700/1983).

Conventionally, as shown in FIGS. 5 and 6, this type of audio equipment has traditionally included a tuner a, a tape deck b, tone control circuits c ₁ and c 2 for left and right channels, and an amplifier d in a set body A, as shown in FIGS. 5 and ₆ , for example. ₁ and d ₂ to output an audible sound signal from the output terminals e ₁ and e ₂ on the rear surface of the set body A, and connect this audible sound signal to the output terminals e ₁ and e ₂ of the left and right speakers. The tone control circuit includes a variable resistor g that applies voltage to f ₁ and f ₂ and adjusts the volume balance between the left and right speakers f ₁ and f ₂ .
A variable resistor h is provided in advance of the tone control circuits c ₁ and c ₂ to adjust the volume balance between _the front and rear speakers in the case of a ₄ -speaker system. , these both variable resistors g and h are connected to the set main body A.
The front panel i is arranged and fixed on the rear surface of the set, and is connected to the left and right balance adjustment knobs j and k, which are pivoted on the front of the set body A, and the front and rear balance adjustment knobs j and k, respectively, and both adjustment knobs j and k are rotated. It is well known that the volume balance between the left and right speakers and the front and back can be adjusted by operating the speakers. In addition, 1 is a variable resistor for volume adjustment, m
is a select switch, and n is an antenna.

However, in the above-mentioned conventional audio device, as shown by the dashed line in the figure, two additional amplifiers d ₃ ,
When adding d ₄ and speakers f ₃ and f ₄ to create a 4-speaker system, change the internal circuit of the set body A by rotating the front and rear balance adjustment knob k provided in advance. Although it has the advantage of being able to easily adjust the volume balance between the front and rear speakers, if a 4-speaker system is not required, the pre-installed variable resistor h for adjusting the front and rear balance is unnecessary. Therefore, it has the disadvantage of being more expensive.

Therefore, in order to deal with this drawback, it is possible to add a variable resistor for front and rear balance adjustment only when a 4-speaker system is required, but in this case, the above-mentioned variable resistor for front and rear balance adjustment is Since it is provided after the tone control circuits _c1 and _C2 , it is necessary to change the internal circuit of the set main body A, which poses a problem of requiring much time and effort.

The present invention was made in view of these points, and 4.
If a speaker system is required, connect a variable resistor for front-rear balance adjustment to the front stage of each speaker arranged in the front and rear, attach it removably to the rear of the main body of the audio equipment set, and connect the variable resistor to the By providing the operating shaft so that it can be operated from the front of the set body, a 4-speaker system can be created easily and inexpensively in a short time without having to install a variable resistor for adjusting the front and rear balance in advance, and without changing the internal circuit. The purpose of this invention is to provide an audio device that enables this.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1 and 2 show an audio device in the case of a two-speaker system, and 1 is a set body. Inside the set body 1 are a tuner 2, a tape deck 3, a tone control circuit 4a for left and right channels, 4b, and amplifiers 5a, 5b
are arranged, and output terminals 6a of the amplifiers 5a and 5b are provided on the rear surface of the set main body 1.
and 6b are provided, and the output terminals 6a and 6b are provided.
Speakers 7a and 7b arranged on the left and right sides are connected to b, respectively, and audible sound signals are output from output terminals 6a and 6b of the amplifiers 5a and 5b, and the audible sound signals are applied to the speakers 7a and 7b. It is composed of

Reference numeral 8 denotes a variable resistor for adjusting the left and right balance, which is provided at the front stage of the tone control circuits 4a and 4b.
The operating shaft 11 of the variable resistor 8 passes through an insertion hole 9a drilled in the front panel 9 and is pivotally supported on the front surface of the set main body 1. A knob 12 for adjusting the left and right balance is attached to the tip of the set 11, and by rotating the knob 12, the operating shaft 11 of the variable resistor 8 for adjusting the left and right balance can be operated from the front of the set body 1. It is configured so that it can be done. Further, inside the operating shaft 11, a first shaft portion 18a of an operating shaft 18 of a variable resistor 17 for longitudinal balance adjustment, which will be described later, is rotatably contained within the operating shaft 11 and pivotally supported on the front surface of the set main body 1. The tip of the shaft portion 18a protrudes from the tip of the operating shaft 11, and the rear end passes through the left-right balance adjustment variable resistor 8 and protrudes rearward, and the rear end is provided with a connecting portion 18c.
is formed. In addition, 13 is a variable resistor for volume adjustment, 14 is a select switch, and 15 is an antenna.

And from such a 2 speaker system to 4
An acoustic device according to the present invention in the form of a speaker system is shown in FIGS. 3 and 4. In FIGS. 3 and 4, a new speaker 1 is installed in front of the speakers 7a and 7b arranged on the left and right sides.
6a and 16b are arranged to form a four-speaker system arranged front and rear, and a variable resistor for front-rear balance adjustment is installed after the amplifiers 5a and 5b, that is, before the speakers 7a, 7b and 16a, 16b. A container 17 is provided. The variable resistor 17 is connected to the amplifiers 5a and 5b.
The audible sound signals outputted from the output terminals 6a, 6b are distributed to the respective speakers 7a, 7b, 16a, 16b, and the speakers 7a,
7b, 16a, and 16b can be adjusted in opposite directions by rotating an operating shaft 18 connected to sliders 17e to 17h of each variable resistor 17a to 17d. .

Furthermore, the variable resistor 1 for adjusting the front and rear balance
7 is removably attached to the rear surface of the set body 1 via a mounting plate 19 with screws 20, and the operating shaft 18 of the variable resistor 17 is pivotally supported on the front surface of the set body 1. The first shaft part 1
8a and the second shaft portion 18b connected to the variable resistor 17 are connected to the connecting portion 18 at the rear end of the first shaft portion 18a.
A front-rear balance adjustment knob 21 is attached to the tip of the first shaft portion 18a by disposing it on the inner circumference of the left-right balance adjustment knob 12'. By operating the variable resistor 1 from the front of the set body 1.
7 operating shafts 18 can be operated.

Therefore, in the above embodiment, when increasing a two-speaker system to a four-speaker system, the variable resistor 17 for front-rear balance adjustment is placed and fixed on the rear surface of the set main body 1, and the second The shaft portion 18b is connected to the first shaft portion 18a included in the operating shaft 11 of the variable resistor 8 for left-right balance adjustment by a connecting portion 18c, and the first shaft portion 18a of the variable resistor 17 and the left-right balance adjustment Front and rear balance adjustment knobs 21 and left and right balance adjustment knobs 1 are provided at each end of the operating shaft 11 of the variable resistor 8 for use.
2', and further speakers 7a, 7b, 16a, 1 arranged on the front, rear, left and right sides of the variable resistor 17.
By connecting 6b, a 4-speaker system can be configured. and a knob 12' for adjusting left-right balance and front-rear balance;
By rotating 21, it is possible to adjust the volume balance between the four speakers 7a, 7b, 16a, and 16b between the front and rear and left and right sides. At that time, the variable resistor 17 for adjusting the front and rear balance
are connected to the front stage of the four speakers 7a, 7b, 16a, 16b, so that the amplifiers 5a,
By controlling the power of the audible sound signals output from the output terminals 6a and 6b of the acoustic set body 1, that is, the audible sound signals output to the outside of the set body 1, the front and rear balance is adjusted. You can easily upgrade to a 4-speaker system in a short time without changing the internal circuitry.
Moreover, the variable resistor 17 for adjusting the front and rear balance
The operating shaft 18 is provided so as to be operable by rotating the front-rear balance adjustment knob 21, so that the front-rear balance between the speakers can be easily adjusted from the front of the set main body 1. Therefore, as in the past, the variable resistor 17 for adjusting the front and rear balance is
Since there is no need to provide a 2-speaker system, the price is reasonably low even when a 2-speaker system is used.

As explained above, according to the present invention, in an acoustic device that outputs an audible sound signal to be applied to a speaker, the audible sound signal is distributed to the front and rear speakers, and the front speaker A variable resistor for front-rear balance adjustment that can adjust the volume of the speakers placed at the rear in opposite directions is connected to the front stage of each of the speakers and removably attached to the rear of the main body of the audio equipment set. By providing the operating shaft of the variable resistor so that it can be operated from the front of the set body,
It is possible to easily upgrade a 2-speaker system to a 4-speaker system in a short time without installing a variable resistor for front-rear balance adjustment in advance, reducing costs and improving ease of assembly. The device can be provided.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention,
Fig. 1 is a partially cutaway plan view of a two-speaker system, Fig. 2 is an electrical circuit diagram of the same,
Fig. 3 is a partially cutaway plan view of a 4-speaker system, Fig. 4 is an electrical circuit diagram of the same,
5 and 6 show a conventional example, with FIG. 5 being a partially cutaway plan view and FIG. 6 being an electric circuit diagram. 1...Set body, 2...Tuner, 3...Tape deck, 4a, 4b...Tone control circuit, 5a, 5b...Amplifier, 7a, 7b, 16
a, 16b... Speaker, 8... Variable resistor for left/right balance adjustment, 11... Operation axis, 13... Variable resistor for volume adjustment, 17... Variable resistor for front/rear balance adjustment, 18... Operation axis , 18a...first shaft part, 18b...second shaft part, 18c...connecting part.

Claims (1)

[Claims for Utility Model Registration] 1. An audio device configured to output an audible signal to be applied to a speaker, in which the audible signal is distributed to speakers placed in front and behind, and the speaker is placed in the front and the speaker is placed in the rear. A variable resistor for adjusting the front-rear balance that can adjust the volume of the speakers in opposite directions is connected to the front stage of each of the speakers, and is detachably attached to the rear of the main body of the audio equipment set. A sound device characterized in that an operating shaft is provided so as to be operable from the front surface of the set main body. 2. The operating shaft of the variable resistor is formed by removably connecting a first shaft portion pivotally supported on the front surface of the set main body and a second shaft portion connected to the variable resistor. The audio device described in item 1).