| 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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