Patent ID: 8124903

Claim:
An input device comprising: a plurality of keys; a position input sensor disposed under the plurality of keys and adapted to detect an input status based on a change of electrostatic capacitance due to transfer of a finger or a conductive material on a top side of the plurality of keys; a base sheet disposed under the position input sensor; a push-down-input type movable contact made of a thin metal sheet and formed in an upwardly protruding dome-shape having a circular or elliptical contour and disposed under the base sheet corresponding to the positions of the keys; and a substrate disposed under the movable contact and having a conductive region such as a wiring pattern corresponding to the movable contact, wherein a columnar section is further provided at a position corresponding to the center of the movable contact in a manner sandwiched between the position input sensor and the base sheet, and the position input sensor comprises a sensor sheet having a predetermined electrode pattern formed using a conductive material such as silver and copper, and the electrode pattern is formed in a manner avoiding the portion where the columnar section and the position input sensor come in contact with each other.