| 摘要 |
PURPOSE:To realize uniform brightness distribution which allows high light emission efficiency with the use of a small number of light transmission bodies or a thin light transmission body by possessing two bar-shaped light sources facing each other and a light transmission plate arranged between the bar-shaped light sources, and arranging plural light transmission bodies which possess a model cross section and alternately facing and providing a diffusing part on the light outgoing plane of the light transmission body. CONSTITUTION:The bar-shaped light sources 5a and 5b are arranged on respective end planes of the light transmission bodies 1a and 1b, and luminous fluxes from the bar shaped light sources 5a and 5b are lead to the light transmission bodies 1a and 1b, respectively. The light transmission bodies 1a and 1b are formed in wedge shape and the diffusing system 2 is provided only on the light emitting plane 6. The luminous flux lead from the light incoming end plane 7 repeats reflection with the light outgoing plane 6 of the light transmission bodies 1a and 1b to be transmitted. The reduction of luminous flux density on the light reaching end plane 8 side is suppressed by making the light transmission bodies 1a and 1b wedge shaped, and as a result, the uniform brightness distribution is obtained. Thus, the thin device allowing high light emission efficiency and the uniform brightness distribution is obtained. |
