Patent ID: 7356235
Filing Date: 2008-04-08
Classification: G02B

Abstract:
1. A light guide plate for a surface light-emitting device, comprising: an upper cladding film; a plurality of core films formed on a lower surface of the upper cladding film, each core film being separated from one another in the form of a stripe; and a lower cladding film formed to cover the lower surface of the upper cladding film and the core films, wherein a plurality of V-cut grooves are depressed from the lower cladding film up to the respective core films and separated from one another, and a metal thin film is formed on an entire lower surface of the lower cladding film or part of the lower surface of the lower cladding film where the V-cut grooves are formed, and wherein widths of the V-cut grooves become larger as the V-cut grooves become farther away from a side surface of the plurality of core films on which light is incident.