Patent ID: 8941622
Filing Date: 2015-01-27
Classification: G06F

Abstract:
1. A coordinate input apparatus which detects a pointed position to an effective coordinate input region, comprising: a light projecting unit configured to project light parallelly to the effective coordinate input region; a reflection unit configured to retroreflect the light projected by said light projecting unit; a light receiving unit configured to receive light from one of said light projecting unit and said reflection unit; a first housing configured to incorporate at least two sensor units each including one of the light projecting unit and one of the light receiving unit; a second housing configured to incorporate at least two sensor units each including one of the light projecting unit and one of the light receiving unit; and a calculation unit configured to calculate the pointed position to the effective coordinate input region based on a variation of a light amount distribution obtained from said light receiving units of each of said first housing and said second housing, wherein in each of said first housing and said second housing, a field range of said light receiving unit is substantially parallel to the effective coordinate input region, an optical axis direction of said light receiving unit is a direction perpendicular to a line segment connecting barycenters of the at least two sensor units in a single housing, and the field range is set to be asymmetric to the optical axis direction.