Patent ID: 6806922
Filing Date: 2004-10-19
Classification: G02B

Abstract:
A surface light-emitting device comprising:a light source; and a light guide panel having a light incident surface provided on an end surface thereof to introduce light from the light source and an exit surface from which the light is radiated, wherein the light guide panel comprises a reflecting surface which faces the exit surface and which is provided with a plurality of grooves formed sequentially in a stripe pattern, each of the grooves having a gentle slope and a steep slope whose slope angle is steeper than that of the gentle slope, and the slope angle of the gentle slope is about 1.8Â° to 2.5Â°, a pitch of the grooves is about 140 &mgr;m to 240 &mgr;m, and the slope angle of the steep slope is about 43Â° to 47Â°.