Patent ID: 6593537
Filing Date: 2003-07-15
Classification: H01H

Abstract:
A membrane switch, including fixed contact points on a circuit board made of a film of resin material, a movable contact point member made of a semi-spherical metal click spring that touches said contact points, and an insulating sheet adhered on said circuit board with said click spring included thereunder, characterized by:a continuous air path connected to a portion of said click spring, formed as a portion where no adhesive material is placed, between said click spring and said insulating sheet adhered on a top face of said click spring, said continuous air path is connected t openings formed between an edge of said insulation sheet and an edge of said circuit board; and said openings being located on edges opposite to each other on said circuit board, and said continuous air path formed with a stripe pattern reaching to said openings on both of the edges opposite to each other, and a pitch of said stripe pattern being shorter than a size of said movable contact point member.