Membrane switch

Abstract

The object of the present invention is obtaining a membrane switch which fixes click springs at fixed positions, and largely reduces damage caused by dust and moisture entering contact points. The present invention provides a membrane switch 10, including fixed contact points 12 and 13 on a circuit board 11 made of a film of resin material such as polyester, movable contact point member made of semi-spherical metal click spring 14 touching said contact points 12 and 13, and an insulating sheet 16 adhered on said circuit board 11 including said click spring 14, characterized by a continuous air path 17 connected to a portion of said click spring 14, formed as a portion where no adhesive material is placed, between said insulating sheet 16 adhered on a top face of said click spring 14 and said click spring 14, and said continuous air path 17 is connected to openings 17a formed between an edge of said insulation sheet 16 and an edge of said circuit board 11.

Dependencies are inferred from the claim text.