Patent ID: 6480187
Filing Date: 2002-11-12
Classification: G06F

Abstract:
An optical scanning-type touch panel in which a region of a plane specified as an object is to be touched is touched by an indicator so that information is inputted, said touch panel, comprising:light recurrence reflection means provided at the outside of said plane; at least two sets of light send/receive means having light emitting means, optical scanning means for periodically scanning a light emitted from said light emitting means angularly in a plane which is substantially parallel with said plane and light receiving means for receiving a reflected light of the light scanned by said optical scanning means from said light recurrence reflection means; comparison means for comparing a light receiving signal by each of said light receiving means with a predetermined threshold value so as to detect a cut-off timing in the case where the indicator exists within the region of said plane; measuring means for measuring a cut-off region of a scanning light by said indicator within the region of said plane based on a scanning angle of each of said optical scanning means and the compared result of said comparison means; and calculating means for calculating a position and size of said indicator within the region of said plane according to the measured result by said measuring means.