Resistance element for wound-type variable resistors and method

Details Resistance element for wound-type variable resistors and method Resistance element for wound-type variable resistors and method

1985-12-05

1988-01-19

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

156630, 338302, H01C 1704

Patent

active

047196939

ABSTRACT:
A resistance element causing less sliding noise for use in wound-type variable resistors and a method of making the same are disclosed. A resistance element obtained by winding a metallic resistance wire on a core is subjected to etching treatment. With this etching treatment, the metallic oxides, chlorides and sulfides considered acting as insulators, and organic molecules, adsorbed gases and other contamination forming the surface layer of the resistance wire are dissolved and removed. Furthermore, by immersing the etched resistance element in an ammonia solution, etc., the copper precipitated on the surface of the resistance wire is dissolved.

REFERENCES:
patent: 2019457 (1935-10-01), Lodge
patent: 3227986 (1966-01-01), Serdahely et al.
patent: 3282821 (1966-11-01), Cistola
patent: 4053977 (1977-10-01), Simon et al.
patent: 4406994 (1983-09-01), Brech et al.

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