Patent ID: 8023780

Claim:
A touch panel comprising: a light-emitting element; a coordinate input region; a light-emitting sided-optical waveguide for guiding light emitted from the light-emitting element to generate light beams for crossing the coordinate input region and having an output end; a light-receiving sided-optical waveguide for receiving the light beams having crossed the coordinate input region and having an input end; a light-receiving element for detecting the intensity of light received at the light-receiving sided-optical waveguide; and an electromagnetic induction-type digitizer provided in a lower part of the coordinate input region, wherein the light-receiving sided-optical waveguide comprises: cores; and a cladding wherein the cores are embedded, the cores each including core branched groups arranged so as to receive light beams; and core main paths for coupling the core branched groups to guide light to the light-receiving element.