Patent ID: 6587099
Filing Date: 2003-07-01
Classification: G02B,G06F

Abstract:
A coordinate input/detection device provided with a coordinate input area, comprising:a plurality of retro reflectors provided around the coordinate input area; a first light-emitting unit; a second light-emitting unit; a first light-receiving unit that corresponds to a first position, and is installed at one of first and second positions, at which said first light-receiving unit receives light emitted from said first light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors; a second light-receiving unit that corresponds to the second position, and is installed at the other position among the first and second positions, at which said second light-receiving unit receives the light emitted from said second light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors; and a position recognition unit recognizing whether each of said first and second light-receiving units is installed at the first position or the second position, based on an output signal of each of said first and second light-receiving units, wherein a ratio of a height to a width of two adjacent retro reflectors among the plurality of retro reflectors is variable, and said position recognition unit recognizes whether each of said first and second light-receiving units is installed at the first position or the second position, in a condition in which said ratio is not one to one, if a shape of the coordinate input area is a square.