JPS6025852Y2 - Attenuator volume - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an attenuator volume that is used in amplifiers and the like and can improve precision and sound quality.

Detent volume was used to adjust the sound quality in amplifiers, etc., but there were problems with accuracy and sound quality.If high precision is required, the resistance value can be adjusted by selecting a fixed resistor and switching it. An attenuator volume is used to change the

As shown in Figure 1, this conventional attenuator volume has a structure in which a fixed resistor 2 is soldered between terminals 1 of a rotary switch, and the fixed resistors 2 are manufactured by hand, one by one. It has the disadvantage of being expensive.

Furthermore, there is a limit to the number of steps due to the structure, and it has been difficult to reduce the size.

In view of the above-mentioned drawbacks, the present invention can reduce the size by fixing a plurality of fixed resistors to a substrate on which a conductive foil is provided in the circuit pattern and assembling the substrate three-dimensionally.
To provide an attenuator volume that can increase the number of steps and can be manufactured at low cost.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a developed version of this embodiment. On the four sides of a switching board 4 with a shaft opening 3 in the center, boards 5, 6.7 for fixing fixed resistors and a board 8 for terminals are respectively installed. Each board 4. 5. 6. A gap 9 is provided between 7° and 8°.

FIG. 3 shows a configuration in which these substrates 4 to 8 are connected.The substrates 4 to 8 are made of an insulating material such as laminated paper phenol, and the back surfaces of the substrates 4 to 8 are made of polyethylene or polyethylene. A piece of flexible material 10 made of a film such as Mido is attached.

A conductive foil 11 is attached to the back surface of the flexible material 10, and a flexible material 11 is attached to the back surface of the conductive foil 11.
2 is attached, and the four layers of substrates 4 to 8, flexible material 1G, conductive foil 11, and flexible material 12, excluding the gap 9, are the contact part of the slider and the soldered part of the fixed resistor. It is glued.

Therefore, each of the substrates 4 to 8 can freely bend in the same direction with the gap 9 as a boundary.

Further, the conductive foil 11 has a circuit pattern as shown in FIG. 4, forming a printed circuit.

On the substrate 4, elongated engagement openings 13 are opened between the shaft 3 and the substrates 5 and 7, respectively. 6.
7 has a plurality of insertion holes 14 for inserting the lead wires of the fixed resistor 15, and the board 8 has three terminal mounting holes 16 opened in a row.

Next, on each side of the boards 5 and 7 opposite to the board 4, there are claws 1.
7, and engagement grooves 18 are formed on both sides of the substrates 5 and 7, respectively.

Further, a general protrusion 19 is formed on both sides of the substrates 6 and 8.

Next, the operation of this embodiment will be explained.

Insert the lead wires of the fixed resistor 15 into the insertion port 14 and solder each lead wire to the heavy wire 11.
The terminal 20 is inserted into the terminal 20 and soldered to the conductive foil 11.

The insertion and soldering of the fixed resistor 15 and the terminal 20 are performed automatically using an automatic insertion machine, and the automatic soldering is performed automatically using a machine or the like.

In this operation, the fixed resistor 15 and the terminal 20 are attached so as to be located on the upper surface of the substrates 5 to 8 in FIG.

With the fixed resistor 15 attached to the boards 5 to 7 as shown in Fig. 2, bend the boards 5 to 8 at right angles to the board 4 using the gap 9 as a bending line, and turn the fixed resistor 15 and the terminal 20 outward. , the circuit pattern formed by the conductive foil 11 is located inside, and the circuit pattern formed by the conductive foil 11 is located inside.

Since the gap 9 is connected by the flexible material 10.12 and the conductive foil 11, the substrates 4 to 8 can be freely bent to form a cubic box.

Then, the retaining protrusions 19 corresponding to the respective engaging grooves 18 are fitted, and the substrates 5 to 8 are assembled in order (snap and build).

Therefore, a valve-shaped case 21 with one side open is assembled using the substrates 4 to 8.

The assembled case 21 is stored in a box-shaped molded case 22 with one side open, and the terminals 20 are placed inside the molded case 2.
The terminal 20 is inserted into an introduction structure 23 formed in the molded case 22, and the terminal 20 projects outside the molded case 22.

A shaft turn 24 is opened in the front of the molded case 22.A rotating shaft is inserted through the shaft turns 24 and 3, and a slider fixed to the rotating shaft is brought into contact with the conductive foil 11, thereby forming a fixed resistor 1.
Select 5 and change the resistance value.

Changes in resistance value can be taken out from the terminal 20.

In addition, when increasing the number of circuits and using multiple circuits,
It is also possible to increase the number of circuits as required by connecting a plurality of cases 21 in which the claw 17 of one case 21 is inserted into the engagement opening 13 of another case 21.

Since the present invention is constructed as described above, the precision sound quality is superior to that of the conventionally used detent volume.

In addition, compared to the conventional attenuator volume using a rotary switch, it is easier and cheaper to manufacture, the number of steps can be increased, and it is possible to not only select the resistance constant but also incorporate a channel divider, graphic equalizer, etc. into the case. becomes possible.

[Brief explanation of drawings]

Fig. 1 is a partial view showing the configuration of a conventional attenuator volume, Fig. 2 is a perspective view of an embodiment of the present invention in an unfolded state before assembly, Fig. 3 is a cross-sectional view of the same, and Fig. 4 is the same as the above. FIG. 5 is a rear view showing the circuit pattern of the same, and FIG. 5 is a perspective view showing the assembled state in the case. 4, 5.6. 7.8... Board, 11...
...Conductive foil, 15...Fixed resistor, 21...
···Case.

Claims (1)

[Scope of utility model registration request] A predetermined circuit pattern is provided using conductive foil, and a fixed resistor is fixed on the opposite side of the board. The board is bent three-dimensionally so that the fixed resistor faces outside, and assembled into a case. The connection of the fixed resistor is made using conductive foil. An attenuator volume characterized by changing the resistance value by switching by rotating a rotating slider that comes into contact with the attenuator volume.