| 摘要 |
PROBLEM TO BE SOLVED: To provide a strong emitted light quantity, to reduce the diffusion degree of emitted light, to further improve emitted light intensity in front and to improve an execution reflectance by turning a diffusion member to a light transmission type mainly for forward scattering and combining it with a specular surface. SOLUTION: This optical reflector is provided with a light diffusion plate 1 and a specular metallic reflector 2 arranged behind the diffusion plate 1. The diffusion plate 1 is turned to the light diffusion plate of mainly the transmission of large forward scattering and small backward scattering. The diffusion plate 1 is turned to the diffusion plate of mainly the transmission provided with a property for which the reflectance along the normal direction of the optical reflector becomes higher than the reflectance in a larger polar angle direction. Further, as for intensity distribution by the direction of the emitted light for which the light made incident and transmitted along the normal direction of the surface of the diffusion plate 1 is reflected by the specular metallic reflector 2, transmitted through the diffusion plate 1 again and emitted from the surface of the diffusion plate 1, the diffusion plate 1 is designed so as to make the emitted light intensity to the vicinity of the normal direction substantially stronger than the emitted light intensity in the direction for forming a larger polar angle. |
