A sealable wafer switch which is normally closed in relaxed position but which opens when squeezed. A lower stiff plate. A first curved conductive member mounted on the lower plate with the curvature extending in the upward direction. An insulating plate mounted on the lower curved plate the insulating plate having a central aperture. A second curved contact member mounted on the insulating plate and having its curvature extending in the downward direction with axis perpendicular to the other curved member. The first and second conductive members being in contact through the aperture when they are in relaxed position. An upper stiff plate mounted on the second curved contact member whereby when the upper and lower stiff plates are squeezed together the contact is broken.

Operation of a video game or an exercise system utilizing a video display is enhanced by a floor controller utilizing weight sensitive pads that allows an operator to input information into the system by locating his feet in specific portions of the floor controller. The system includes an interface circuit which obtains foot location signals from the floor controller and transmits this information to a system microprocessor which in turn is used to control the video display. The system can also include light segments that are under control of the microprocessor and which are associated with each of the weight sensitive pads.

A pressure switch and method of manufacture wherein a resiliently yieldable intermediate open layer is sandwiched between flexible conductive layers, all of which is enclosed between flexible outer layers, so that in the unstressed or relatively unstressed condition the contact layers are spaced apart by the intermediate layer, while flexure or other sufficient stressing of the assembly effects contact of the contact layers through the open intermediate layer.

A membrane keyboard containing a larger size key pad label and a smaller size key pad labels; a pair of laminate sheets carry confronting conductor electrodes, each of the conductor electrodes being shaped to exactly follow the corresponding key pad label; and spacer sheet disposed between the pair of laminate sheets for electrically separating the confronting conductor electrodes. The spacer sheet is provided with a plurality of openings formed at positions corresponding to each of the conductor electrodes. The openings corresponding to the larger size key pad labels are divided into at least two sections through the use of, for example, a bridge layer extending across the opening, thereby uniforming the key actuation condition.

A membrane keyboard containing larger size key pad label and a smaller size key pad labels; a pair of laminate sheets carry confronting conductor electrodes, each of the conductor electrodes being shaped to exactly follow the corresponding key pad label; and spacer sheet disposed between the pair of laminate sheets for electrically separating the confronting conductor electrodes. The spacer sheet is provided with a plurality of openings formed at positions corresponding to each of the conductor electrodes. The openings corresponding to the larger size key pad labels are divided into at least two sections through the use of, for example, a bridge layer extending across the opening, thereby uniforming the key actuation condition.