| 摘要 |
PURPOSE: To unify luminance of all the points on a cover by providing a reflector with a longitudinal light regular reflection characteristic and a cover in which a non-absorbing characteristic is provided and transmittance in an optical point on its surface represents a function of the point. CONSTITUTION: A reflector 34 is provided with a reflection part partially transmitting light and a plurality of dielectric interfaces, and a light source 32 includes the reflector 34 showing a longitudinal light regular reflection characteristic. At the same time, light is emitted to the outside through a cover 38 showing a light-non-absorbing characteristic. Transmittance in an optional point on the cover 38 is varied as a function of the position of the point, and light discharged from the cover 38 in this point shows a set light divergence degree. In this way, luminance in all the points on the cover 38 can be unified. |
