Patent ID: 6954237
Filing Date: 2005-10-11
Classification: G02B,Y10S

Abstract:
1. A surface-emitting device comprising: a light guide panel; a light guide placed along an end face of said light guide panel; and a light source placed at an end of said light guide, wherein a side face of said light guide facing said end face of said light guide panel serves as an emergent surface for applying light from said light source to said light guide panel, a side face remote from said emergent surface serves as a reflecting surface on which concave grooves are periodically formed at a predetermined pitch, each of said concave grooves having a pair of inclined faces for reflecting light propagating inside said light guide, a depth of said grooves increases toward the center of said light guide, and the angle formed between said two inclined faces constituting each of said grooves is within the range of 105° to 115°.