High sensitivity mat switch

A high sensitivity mat switch for response to low unit pressure over a broad area and comprising a pair of substantially imperforate broad outer sheets in general parallelism, said outer sheets being relatively rigid for high durability, a resilient compressible open work spacer sheet having a multiplicity of through openings and located between said outer sheets, a resiliently compressible substantially imperforate deflection sheet located between said spacer sheet and one outer sheet, said spacer sheet being compressible and said deflection sheet being elastically deformable into and substantially through multiple openings in said spacer sheet under relatively low compressive force applied to an area of said outer sheets overlying the multiple openings, a first conductive sheet between and engaging said spacer sheet and the other outer sheet, and a second relatively flexible conductive sheet between and engaging said spacer sheet and said deflection sheet in spaced confronting relation with said first conductive sheet through said multiplicity of openings in the absence of said compressive force, said second conductive sheet being relatively flexible and deflectible with said deflection sheet into said multiple openings to contact said first conductive sheet at a plurality of locations under relatively low compressive force applied to said area of said outer sheets, said outer sheets being more rigid than said deflection sheet and said second flexible conductor sheet.