JPH01164002A - variable resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a variable resistor.

Conventional technology In recent years, the scope of use of variable resistors has been expanding from being used as variable resistors for general consumer equipment to being used as variable resistors for detecting position, angle, etc.
Along with this, the environmental conditions under which variable resistors are used are also becoming more severe.

In addition, in the above-mentioned fields of application, a structure is required to take out the output of the variable resistor by directly connecting the connector to the variable resistor. Variable resistors with a structure have become popular.

An example of the conventional variable resistor mentioned above will be described below with reference to the drawings.

In FIGS. 3a and 3b, 1a is a resistor, 1b is a resistor terminal, 2 is a case terminal, 4 is a case, and 3 is solder. A portion of the case terminal 2 protrudes from the case 4, and a resistor terminal 1b connected to the resistor 1a is directly connected to this portion by a method such as soldering or welding.

Problems to be Solved by the Invention However, with the above structure, under severe temperature conditions with a wide range of high and low operating temperatures,
When the resistor terminal 1b and the case terminal 2 expand and contract due to the temperature difference, compressive and tensile stresses are generated in the connection between the two terminals, and the connection or the parts attached thereto are destroyed. There was a problem.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a variable resistor having a structure in which the resistor terminals are made flexible in advance to alleviate the stress generated in the connection portion due to expansion and contraction due to temperature differences.

Means for Solving the Problems In order to solve the above problems, the variable resistor of the present invention has the following features:
The resistor terminal is made into a curved shape in advance and connected to the case terminal.

Effect The present invention uses the above-described structure to absorb expansion and contraction caused by temperature differences by changing the shape of the curved portion, and directly
The structure is such that the connection part does not receive large compressive or tensile stress.

EXAMPLE Hereinafter, a variable resistor according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows the structure of a variable resistor in a first embodiment of the present invention.

In FIG. 1, 4 is a case, 2 is a case terminal attached to the case 4, 6 is a rotor, 6 is a sliding contact, 1a is a resistor, 1b is a resistor terminal, 7 is a cover, and 8 is a shaft. The resistor terminal 1b has a curved end, and is connected to the case terminal 2 by solder 3 at this curved portion.

Regarding the variable resistor configured as above, the following is the second section.
The effect will be explained using diagrams.

1. Figure 2 shows the compression and tension of each terminal when a temperature change is applied. As the temperature increases, each terminal expands due to heat, and the shape shown by the arrow A compressive force is generated in the direction.

At this time, by connecting the resistor terminal 1b to the case terminal 2 in a pre-curved state, the compressive stress generated due to compression is applied to change the curved shape, and the compressive stress is directly applied to the connection part. prevents it from working.

Also, contrary to the above situation, when the temperature changes to a low temperature and each terminal contracts and a tensile force is generated in the direction of arrow B, the tensile stress is applied in the same way as above to cause the resistor terminal 1b to curve. Since the shape of the connected portion changes, it is possible to prevent tensile stress from directly acting on the connected portion.

In this embodiment, the resistor terminal 1bff was connected in a curved shape so that the curved portion was deformed by compressive and tensile stress so that no stress was applied directly to the connected portion, but the resistor terminal 1b Instead, FP is a flexible conductor.
The resistor terminal 1b and the case terminal 2 may be connected by curving C.

Effects of the Invention As described above, the present invention curves the resistor terminal and connects it to the case terminal, so that the compressive and tensile stress that acts on the connecting portion of both terminals due to temperature is absorbed by the curved portion, The structure is such that no stress is applied directly to the connection part, so
It is possible to maintain electrically and mechanically stable conditions.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a variable resistor according to an embodiment of the present invention. FIG. 2 is a diagram showing the state of compression and tension when each terminal expands and contracts when a temperature change acts on a variable resistor according to an embodiment of the present invention. FIGS. 3a and 3b are a top view and a sectional view showing a connection structure between a resistor terminal and a case terminal in a conventional variable resistor. 1...Resistor, 1b...Resistor terminal,
2...Case terminal, 3...Solder, 4...
...Case, 6...Rotor, 6...
・Sliding contact. Name of agent: Patent attorney Toshio Nakao and 1 other person 7M
-One resistance 4tsu L end/b-One resistance IX Comic inner i child? ---Case version Te3-Solder4-Case No. 2 Figure A→ ←A Figure 3

Claims (2)

[Claims] (1) A resistor, a resistor terminal for extracting an electrical signal from the resistance part of the resistor, a sliding contact that presses against the resistor, a rotor that holds the sliding contact, and the resistor. a case housing the rotor; a case terminal for electrically coupling the resistor terminal is provided in a part of the case; a part of the resistor terminal is curved and coupled to the case terminal; variable resistor. (2) The variable resistor according to claim 1, wherein a part of the resistor terminal is formed by a flexible printed wiring board (hereinafter referred to as FPC).