Patent ID: 8698060
Filing Date: 2014-04-15
Classification: G06F

Abstract:
1. A position detection system comprising: a light reception line sensor unit in which a light reception line sensor is disposed in an enclosure shape; a plurality of light sources that emit light to an enclosure region enclosed by the enclosure shape to create a shadow of an object which lies on the enclosure region; and a position detection unit that detects the shadow from light reception data of the light reception line sensor unit, and uses data based on the shadow to detect a position of the object by means of triangulation; wherein in a case where the object lying on the enclosure region has a linear shape and rotates such that an end of the object draws a circular locus, the position detection unit turns on independently each of the plurality of light sources, creates one shadow of the object by turning on one of the light sources, creates another shadow of the object by turning on another of the light sources, and detects a total of two shadows; connects each of the light sources to both ends of the shadow on the light reception line sensor unit based on each of the light sources, thereby creating four first connection lines and finding four intersections of the four first connection lines; and finds an inter-connection line created by connecting two intersections, which are intersections of the four intersections and lie on the circular locus, as the position of the object.