US Patent 7397004 Push-switch for vehicle and method of manufacturing the same

A push-switch for vehicle, and a method of manufacturing the same, including fixed contacts and movable contact brought into and out of contact in accordance with upward and downward movements of operating member, in which at least one of the contacts is provided on surfaces thereof with a plurality of fine projections and depressions produced by arcing discharges between the contacts or machining work. Contacts at a large number of points are attained by the provision of the plurality of fine projections and depressions, hence a switch capable of stable contact can be provided.