Abstract: A variable resistor that utilizes, as its resistive component, an extension type conductive elastomer such as a conductive silicone rubber cross-linked and then impregnated with a silicone oil, that will experience a change in electrical resistance responsive to an extension thereof. The elastomer is interposed as a sheet between a pair of electrodes and a pushing member that is capable of movement so as to press the elastomer against the ends of electrodes, creating an extension of that elastomer between the electrodes. The magnitude of which elastomer extension corresponds to the force exerted on the pushing member, and in proportion to the change in electrical resistance of that elastomer as measured across the electrodes.

Abstract: A pressure sensor that utilizes an extension type conductive elastomer that will exhibit a decrease in its electrical resistance in response to an extension thereto. Like sheets of the conductive elastomer and an electrically insulative elastomer are overlaid and sandwiched between supporting members within a housing of the pressure sensor. The housing and each supporting member are preferably cylindrical or ring shaped, and which conductive elastomer has a pair of spaced electrodes electrically connected thereto at opposite points on its periphery. The periphery of the electrically insulative elastomer is squeezed continuously in a circle between the supporting members, while that of the conductive elastomer that includes recesses is squeezed therebetween discontinuously in the sections between the electrodes.