Title: Resistance element for wound-type variable resistors and method
Application Number: 86101687 Application Date: 1986.03.15
Publication Number: 1004756 Publication Date: 1986.11.05
Approval Pub. Date: 1990.09.26 Granted Pub. Date: 1990.09.26
International Classifi-cation: H01C17/04
Applicant(s) Name: Tokyo Cosmos Electric Co., Ltd. Address:
Inventor(s) Name: Kentaro Chono;Taichiro Ouna
Attorney & Agent: FU KANG
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.
Time: 17