Patent ID: 7341188

Claim:
A position detection system which detects a pointing position of a pointing device on a surface to be detected; the position detection system comprising: a scan beam illumination section which shines a line-shaped scan beam onto the surface to be detected, and scans the line-shaped scan beam at a predetermined speed in two different directions on the surface to be detected; a light-receiving section which detects the line-shaped scan beam reflected from the surface to be detected; and a position calculation section which calculates the pointing position on the surface to be detected, based on a time from start of scanning of the line-shaped scan beam that scans in a first direction of the surface to be detected until the light-receiving section detects the line-shaped scan beam, and a time from start of scanning of the line-shaped scan beam that scans in a second direction of the surface to be detected until the light-receiving section detects the line-shaped scan beam.