Abstract: A coordinate input device includes a coordinate detecting part detecting a position of a touch on an operation surface so as to generate coordinate information of the position of a touch. The coordinate input device also includes a holding part holding a sheet-like material on the operation surface.

Abstract: A coordinate-detecting device of a voltage-detecting type, the device including: a coordinate input pad having an upper sheet and a lower sheet opposing each other at a predetermined gap, the sheets being in electrical contact when there is a touch on the coordinate input pad; a voltage-detecting part for alternately detecting voltage values representing an X-coordinate and a Y-coordinate of a contact point; and a control part for generating a coordinate data from the voltage values detected at the voltage-detecting part. The upper sheet and the lower sheet oppose each other at the predetermined gap by a repulsive force between magnetic poles with the same polarity.

Abstract: A keyboard switch having a dustproof and droplet-proof push-button includes an elastic tube having upper and lower open ends fastened to a slider capped with a keytop and a panel supporting the push-button, respectively, to prevent a dust or droplet of water from being sucked into a space under the slider connecting to an area where pressure sensitive electric switches are located. The elastic tube is collapsible telescopically when the keytop is pushed down, but recovering the original shape by its own elasticity when the pushing force on the keytop is removed. One embodiment of the present invention is one having another elastic member mounted between the slider and one of immobile members, which works predominantly in the final stage of the stroke of the keytop to protect the pressure sensitive electric switch from an excessive impact of tapping.

Abstract: A keyswitch includes a keytop, a base, an elastic actuator between the keytop and the base, a switch actuated by the actuator, and a link mechanism disposed between the base and the keytop, the link mechanism including first and second link members engaged with each other mechanically at respective first ends thereof, wherein the first and second link members further establish a slide engagement with a rear surface of the keytop at respective second ends thereof.