| 摘要 |
A light guide plate (32), which is made from a transparent plastic sheet, defines an emission surface (37) and a bottom surface (35) on a top end and a bottom end respectively. A number of arcuate recesses (34) are defined in the bottom end thereof. The arcuate recesses are parallel to each other, and adjacent arcuate recesses are separated each other a uniform predetermined distance. A surface lighting device (3) incorporating such light guide plate further includes a number of light sources (31) received in the arcuate recesses respectively, and a reflection board (31) arranged adjacent the bottom surface for reflecting light.
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