Variable capacitance type push-button switch

摘要

A capacitance type push-button switch which includes a movable member carried by the lower end of a key stem and including a holding member made of an elastic material of high compressibility and having a convex lower surface, a movable electrode made of an electrically conductive and flexible material held to the lower surface of the holding member, a dielectric film carried by the movable electrode and comprised of a synthetic resin of a fluoride type which can be brought into contact with two stationary electrodes to vary the capacitance therebetween, means including a pair of suspending pieces each carrying at their lower end portions a respective pawl adapted to engage the holding member when it is raised to its upper position for holding it in place, and means for releasing the pawls to bring the dielectric film into pressed contact with the stationary electrodes.