Patent ID: 8791925
Filing Date: 2014-07-29
Classification: G06F

Abstract:
1. A coordinate input apparatus comprising: retroreflecting units provided at two opposite sides of a rectangular-shaped coordinate input effective region; and a plurality of sensor units provided at the two sides, wherein each of the sensor units comprises: a light receiving unit adapted to receive light that reaches the light receiving unit; a light projecting unit adapted to project light toward a retroreflecting unit provided at one of the two sides, which opposes the light projecting unit; and a light emitting unit adapted to emit diffused light from a band-shaped surface, and wherein each of the sensor units simultaneously detects, by the light receiving unit, light that has been projected by the light projecting unit and reflected back by the retroreflecting unit provided at the side opposing the light projecting unit, and light that has been emitted by light emitting units of a plurality of sensor units provided at the side opposing the light projecting unit.