Abstract: The present invention has an object thereof is to provide a key base which can be thinned, a key sheet which can be thinned and a method of forming a key base which can be thinned. According to a first aspect, there is provided a key base comprising: a flexible film sheet; and a plurality of pressers made of a non-thermo-curing type material and formed integrally with the film sheet on the backside of the film sheet.

Abstract: An object of the present invention is to provide a directionality judging method for an operation key in a direction detecting switch, capable of detecting a key operation in any direction; and superior as the cursor can be freely moved by one operation key.

Abstract: An object of the present invention is to provide a direction detecting switch which can detect a key operation in every directions of 360 degree, can obtain an accurate click feeling, and can also detect a strength or a speed of the key operation.

Abstract: A first object is to provide a key unit capable of preventing a problem that a key top gets under a key window frame of a casing of a movable telephone or the like during key pushing down, and capable of preventing floating of the key top and interferences with movements between keys in a narrow-pitch key board which cannot employ a key window frame. A second object is to provide a key unit of a novel thin structure, capable of eliminating a dual structure where an light guiding plate is superposed as a separate component. A hard base key unit comprises a hard base made of a hard resin plate and having a through hole on a plane thereof, a key pad made of a rubber-like elastic body film to cover the through hole 1 of the hard base, a switch thrusting projection formed integrally with the key pad on a plane of the key pad facing the inside of the through hole, and a key top made of a hard resin and provided at a position corresponding to the switch thrusting projection on the other plane of the key pad.

Abstract: An end of the present invention is to make it possible to input multi-valued signals by a manipulation to incline a key in a multi-direction-operative key switch, and disclosed is a structure of a multi-direction-operative key fitting to the end of the present invention.