JPH06163216A - Variable resistor and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To provide a variable resistor capable of automatically assembling at low cost and to decrease the number of parts handed in assembling step in relation to the variable resistor mainly used for main volume control, intermediate volume control of audio system such as head phone stereo, etc. CONSTITUTION:A metal fitting 8, a gland terminal 1, output terminals 2a, 2b, input terminals 3a, 3b are integrally provided on a hooped metallic sheet to be fitted with a resistor substrate 4 and then respective terminals excluding the gland terminal 1 are cut off furthermore, a knob 7 fitted with brushes 6a, 6b is rotatably fixed through the intermediary of the resistor substrate 4 to complete the variable resistor. Through these procedures, the gland terminal 1 can be integrated with the metal fitting 8 which is handled as the hooped metallic sheet integrated with the output terminals 2a, 2b, input terminals 3a, 3b, etc., halfway in the assembling step thereby enabling the mass productivity to be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is mainly applied to a main volume of an audio device such as a headphone stereo and a portable CD,
The present invention relates to a variable resistor used for an intermediate volume of a headphone and the like and a manufacturing method thereof.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. According to the figure, 21,22a, 22b, 23a, 2
Reference numeral 3b is a terminal, which is connected to the resistance paths 24a and 24b and the conductive portions 25a and 25b which are concentrically provided on the resistance substrate 24 and have different radii.

26a and 26b are resistance paths 24a and 24b,
A brush that is in sliding contact with the conductive portions 25a and 25b,
It is fixed to the knob 27. Reference numeral 28 denotes a metal fitting, which holds the resistance substrate 24 and is provided with a lug-shaped projection 28a provided at the center thereof so that the knob 27 is rotatably mounted. The terminal 21 and the terminal 23 are attached depending on the position of the knob 27.
a, the voltage applied to terminals 21 and 23b is applied to terminal 21
And a terminal 22a and a terminal 21 and a terminal 22b.

Next, the assembly of the variable resistor will be described. The terminals 21, 22a, 22b and 23 are formed on the resistance substrate 24.
a and 23b are fixed to each other by means of eyelet mechanical fastening, the resistance substrate 24 is inserted into the eyelet-shaped protrusion 28a of the metal fitting 28, and the knob 27 to which the brushes 26a and 26b are fixed is attached so as to be rotatable. Inspection is carried out to complete the assembly.

[0005]

However, in the above-mentioned conventional variable resistor, since the number of parts is large and small, mechanical assembly is difficult and there is a problem in mass productivity.

[0006]

In order to solve the above problems, the present invention provides a metal fitting and a ground terminal (common terminal) integrally to reduce the number of parts, and at the time of assembly, the metal fitting and the terminal are integrated. After forming on a metal plate or metal hoop, after mounting on the lower mold of the assembly machine, before or after mounting the resistance board and knob, all terminals except the ground terminal are cut and separated from the metal fittings to manufacture a variable resistor. is there.

[0007]

In the completed variable resistor having the above-described structure, the ground terminal and the metal fitting are integrated to reduce the number of parts, and the metal fitting and the terminal can be handled as one component during the assembly process, which facilitates mechanical assembly. This makes it possible to provide a variable resistor that is easy and has high mass productivity.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a variable resistor according to the present invention is shown in FIGS.
Will be described. According to the figure, 1 is a ground terminal, 2
a and 2b are output terminals, and 3a and 3b are input terminals. The resistance paths 4a provided concentrically on the resistance substrate 4 with different radii have the input terminals 3b, and the resistance paths 4b have the input terminals 3a. , The output terminal 2b is connected to the conductive portion 5a.
The output terminal 2a is connected to b, and the ground terminal 1 is connected to the connection portion of the resistance paths 4a and 4b. 6
Reference character a denotes a brush that slides on the resistance path 4a and the conductive portion 5a, and reference numeral 6b denotes a brush that slides on the resistance path 4b and the conductive portion 5b. The brush 6 is mounted on the knob 7.

Reference numeral 8 denotes a metal fitting, which is formed integrally with the ground terminal 1, by crimping the eyelet portion of the ground terminal 1 and connecting the center eyelet portion 8a to the central hole 4c of the resistance substrate 4.
The knob 7 is rotatably mounted while holding the resistance substrate 4 by inserting it into the ground terminal 1 and the input terminal 3a, and the ground terminal 1 and the input terminal 3b are loaded depending on the position of the knob 7. The voltage is divided into the ground terminal 1 and the output terminal 2a, and the ground terminal 1 and the output terminal 2b are divided and output.

Next, the assembly will be described. First, the metal fitting 8
And ground terminal 1, input / output terminals 2a, 2b, 3a, 3b
Is formed on a continuous hoop-shaped metal plate as shown in FIG.

Next, the hoop-shaped metal plate having the metal fitting 8, the ground terminal 1, and the input / output terminals 2a, 2b, 3a, 3b is inserted into the lower die (not shown) of the assembling machine.

Next, the eyelet portion 8a of the metal fitting 8, the ground terminal 1, the output terminals 2a and 2b, and the input terminals 3a and 3b.
The eyelets of the holes 4c, 4d, 4e, 4f, 4g of the substrate 4
Then, the input / output terminals 2a, 2b, 3a, 3b are fixed to the resistance substrate 4 by caulking the eyelets, and at the same time, the resistance substrate 4 is held by the metal fitting 8 integrated with the ground terminal 1.

After that, the crosspiece 9 for reinforcement is cut off,
After that, the eyelets 8a of the metal fitting 8 are pierced through the fixed knobs 7 and the hole 7a of the rotation center of the brushes 6a and 6b, and are swaged to be held rotatably. After that, the output terminals 2a and 2b are separated from the connecting bar 10 and a necessary inspection is performed. Finally, the ground terminal 1 and the input terminals 3a and 3b are separated and bent to complete the variable resistor.

In the above embodiment, the crosspiece 9 and the connecting crosspiece 10 are connected to the ground terminal 1 and the input / output terminals 2a, 2b and 3 respectively.
Although a and 3b are caulked and fixed to the resistance substrate 4 and then cut, the terminals may be cut and separated after the hoop-shaped metal plate is inserted into the lower die of the assembling machine. Alternatively, a single sheet-shaped metal plate may be used.

[0015]

As described above, according to the present invention, the ground terminal and the metal fitting are integrated to reduce the number of parts, and the metal fitting and the terminal can be handled as one component during the assembly process.
This makes it possible to provide a variable resistor which is easy to assemble mechanically and has high mass productivity.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a variable resistor of the present invention.

FIG. 2 is a sectional view of the same side.

FIG. 3 is an exploded perspective view of a conventional variable resistor.

FIG. 4 is a sectional view of the same

[Explanation of symbols]

 1 ground terminal 2a output terminal 2b output terminal 3a input terminal 3b input terminal 4 resistance board 4a resistance path 4b resistance path 5a conductive part 5b conductive part 6a brush 6b brush 8 metal fitting 9 crosspiece 10 splice

Claims (2)

[Claims] 1. A knob provided with at least a brush,
The two resistance paths to which one ends of the brushes that are slidably contacted are connected, the resistance substrate on which conductive portions corresponding to the two resistance paths are formed, and the ground terminal fixed to the connection portion of the two resistance paths are integrated. A variable resistor comprising a metal fitting provided on the above and another terminal fixed to the resistance path and the conductive portion. 2. The metal fitting, the ground terminal and the other terminal are integrally formed, and the ground terminal and the other terminal are fixed to at least the resistance path and the conductive portion formed on the resistance substrate, and then the other terminal. The method of manufacturing a variable resistor according to claim 1, wherein the variable resistor is cut and separated.