Patent ID: 7941017
Filing Date: 2011-05-10
Classification: G02B,G06F

Abstract:
1. An optical touch panel comprising: a coordinate input region; a light-emitting element; a light-receiving element; a light-emitting sided-optical waveguide connected to the light-emitting element and having an output end; and a light-receiving sided-optical waveguide connected to the light-receiving element and having an input end, wherein the output end of the light-emitting sided-optical waveguide and the input end of the light-receiving sided-optical waveguide are located on opposite sides of the coordinate input region, the light-emitting sided-optical waveguide has an under-cladding layer, a plurality of cores provided on the under-cladding layer, wherein the cores have distal ends, and an over-cladding layer covering the cores, including the distal ends of the cores, and the under-cladding layer, the under-cladding layer and the over-cladding layer of the light-emitting sided-optical waveguide have a lower refractive index than the cores of the light-emitting sided-optical waveguide, the over-cladding layer of the light-emitting sided-optical waveguide has an output end, the light-receiving sided-optical waveguide has an under-cladding layer, a plurality of cores provided on the under-cladding layer, wherein the cores have distal ends, and an over-cladding layer covering the cores, including the distal ends of the cores, and the under-cladding layer, the under-cladding layer and the over-cladding layer of the light-receiving sided-optical waveguide have a lower refractive index than the cores of the light-receiving sided-optical waveguide, the over-cladding layer of the light-receiving sided-optical waveguide has an input end, and at least one of the output end of the over-cladding layer of the light-emitting sided-optical waveguide and the input end of the over-cladding layer of the light-receiving sided-optical waveguide is a lens having a radius of curvature of 0.3 mm to 5 mm.