Patent ID: 8207464
Filing Date: 2012-06-26
Classification: G06F,H01H,H04M

Abstract:
1. A portable terminal, comprising: a substrate having a plurality of fixed contacts provided thereon; a housing main body covering the substrate from a front surface thereof, and having a key through hole; a key sheet forming a plurality of operation keys by partitioning the key through hole by slits; a urethane sheet attached to a rear surface of the key sheet, and having ridge portions that bulge out through the slits to a front side of the key sheet, where rear sides of the ridge portions have groove-like openings; a rubber layer attached to a rear surface of the urethane sheet, and having a plurality of protruding portions that protrude toward the substrate at positions corresponding to the plurality of fixed contacts; light emitting means disposed closer to the substrate than the rubber layer is, for emitting light; a light guide sheet disposed closer to the substrate than the rubber layer is, for receiving light from the light emitting means, and guiding the light to the key sheet; a plurality of conductive movable contacts disposed closer to the substrate than the light guide sheet is, so as to correspond to the plurality of fixed contacts; and pressing means that is pressed by the protruding portions to electrically connect the conductive movable contacts to the fixed contacts, when the keys are depressed, wherein the rubber layer includes wrong operation preventing means disposed at locations corresponding to the rear sides of the ridge portions, for preventing the operation keys located adjacent to each ridge portion from being depressed at the same time, and the wrong operation preventing means is openings formed along the ridge portions.