Patent ID: 9715057
Date: 2017-07-25
CPC Classifications: G02B,G02F

Claim:
1. A surface light source device comprising: a first light source for emitting first light; a first light guide rod having a first light incident surface and causing said first light to be incident from said first light incident surface and converting said first light into first linear light; a second light source for emitting second light having a greater divergence angle than that of said first light; a second light guide rod having a second light incident surface and causing said second light to be incident from said second light incident surface and converting said second light into second linear light extended in the same direction as said first linear light; a reflecting bar being disposed on emission sides of said first light guide rod and said second light guide rod, and having at least one reflecting portion for reflecting part of said first linear light and part of said second linear light and at least one diffusion reflecting portion for diffusing and reflecting a residual part of said first linear light and a residual part of said second linear light, wherein the reflecting portion has greater reflectivity than the diffusion reflecting portion; and a reflecting member being formed in a box shape such that said first light guide rod, said second light source, said second light guide rod, and said reflecting bar can be accommodated, and having an opening portion with said emission side opened and a reflecting surface for reflecting said first linear light and said second linear light on an inside of said box shape, wherein said first light incident surface is an end face in a longitudinal direction of said first light guide rod, said first light source is disposed in an opposed position to said first light incident surface, said second light incident surface is a surface formed along a longitudinal direction of said second light guide rod at an opposite side to said emission side, said second light source is disposed in an opposed position to said second light incident surface, and part of said first linear light and part of said second linear light are reflected by said reflecting portion of said reflecting bar and said reflecting surface, and a residual part of said first linear light and a residual part of said second linear light are diffused and reflected by said diffusion reflecting portion of said reflecting bar and are emitted from said opening portion.