Patent ID: 7375720
Filing Date: 2008-05-20
Classification: G02B,G06F

Abstract:
1. A coordinate input apparatus including light-emitting means for projecting light to a coordinate input region, reflection means arranged at a peripheral portion of the coordinate input region, for recursively reflecting light emitted from said light-emitting means, light-receiving means arranged in the coordinate input region, for receiving light reflected by said reflection means, and calculation means for executing a coordinate acquisition operation for obtaining a position where light is shielded in the coordinate input region as a coordinate position of a pointer having a light-emitting function in the coordinate input region, on the basis of a light amount distribution obtained from said light-receiving means, comprising: detection means for detecting, as a light emission signal, light emitted from the pointer; and control means for controlling the coordinate acquisition operation by said calculation means on the basis of a detection result by said detection means, wherein said control means controls to inhibit said calculation means from executing the coordinate acquisition operation during a predetermined period after said detection means detects the light emission signal transmitted from the pointer.