| 摘要 |
PROBLEM TO BE SOLVED: To realize uniform light emission in a surface lighting system. SOLUTION: In this surface lighting system, light scattering parts 15 of a light guide body 7 comprises grooves, each having an equal engraving depth D, while formation intervals P of the light scattering parts 15 are set to 0.01 mm in a portion having a narrowest interval and to 0.2 mm in a portion having the widest interval. For the purpose of suppression of generation of light and dark striped pattern caused by reflection of light in the light scattering parts 15, it is preferable that the formation interval P be as narrow as possible. However, in the case that the formation interval P is too narrow, it is difficult to secure desired machining accuracy. Accordingly, as the narrowest interval taking into consideration the machining accuracy, a minimum value of the formation interval P is set to 0.01 mm. As the maximum value of the formation interval P for which allowing visual recognition of the light and shade, 0.2 mm is selected. |
