Sliding contact

Abstract

Intended is to provide a sliding contact having an output accuracy improved better than that of the prior art. A slider (2) is constituted by coating bundles of multiple carbon fibers (6) with a resin(5). The slider (2) is bifurcated into a first leg portion (2c) and a second leg portion (2d), which are cut by a laser, for example, to have leading end faces (2c2 and 2d2), and the surfaces of boththe resin (5) and the carbon fibers (6) are exposed to the leading end faces (2c2 and 2d2). These cut leading end faces (2c2 and 2d2) are made as sliding faces. As a result, the hysteresis can be made lower than that of the prior art, whereby the output accuracy can be effectively improved.

Description

Technical field [0001] The present invention relates to a sliding contact capable of improving output accuracy and operation durability. Background technique [0002] For sliding contacts used in potentiometers for automobiles, for example, they are currently made by processing plating materials or clad materials of a precious metal alloy of Ag or Pd. [0003] However, due to the formation of insulators due to the catalytic effect of Pd in ​​an atmosphere such as low-molecular-weight siloxane or ammonia gas, or the use of oil to improve lubricity, the problem of increased contact resistance at low temperatures, or vibration, etc. In this case, the specific gravity of the brush causes the problem of excessive load on the resistance (conductive pattern). Therefore, non-metallic materials, oil-free (high lubricity) and light specific gravity sliding contacts are required. The following patent documents disclose alternatives A precious metal alloy, and a technology that uses carbon fi...

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned structure, when sliding repeatedly in the forward and reverse directions, the output at the same position differs, that is, hysteresis is likely to occur.

[0009] In addition, since only the carbon fiber protrudes from the front end, if the slider is repeatedly slid on the resistor, the front end of the carbon fiber is prone to failure such as breakage.

If the broken carbon fiber remains on the conductive pattern, it is the cause of output noise, and it is easy to cause a short circuit between the conductive patterns.

[0010] In this way, the structure of the slider described in the above-mentioned patent documents is difficult to properly improve the output accuracy.

[0011] In addition, Patent Document 1's Figure 10 and Figure 11 with Patent Document 1's figure 2 Different, discloses the structure that does not insert the carbon fiber aggregate 47 in the tube

[0012] For example, in the column [0029] of Patent Document 1, it is described that "the belt-shaped carbon fiber aggregate 47 of this form can be covered and fixed by a fixing layer such as an adhesive layer to maintain a shape other than the end", but as mentioned above As mentioned above, this method is considered to be a method in which only the end portion is made of carbon fibers and the carbon fibers are protruded, so there is a problem that it is difficult to appropriately improve the output accuracy.

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