Optical diffuser

Abstract

Abstract PURPOSE:To realize easily a surface illumination whose luminance is nearly uniform by forming a stepped part by superposing plural pieces of optical transmission bodies having a light incident end and a light emitting end, and also providing an optical diffusion plate so as to cover the stepped part. CONSTITUTION:A stepped part 4 is formed by superposing plural pieces of transparent plate-shaped bodies 2 of 0.5mm. thick having a light incident end face 6 and a light emitting end face 3, and fixed by an adhesive agent. On the upper part of this stepped part 4, an optical diffusion plate 11 is placed, and a light source 13 such as a long-sized fluorescent lamp, etc. is placed along the light incident end face 6 of an optical diffuser 1. The light which is made incident on the plate-shaped body 2 repeats a reflection and is emitted from the end face 3, and thereafter, subjected to a reflection or refraction by a prism 12 and emitted from the diffusion plate 11. Therefore, when a light of an equivalent quantity is made incident from the end face 6, an equivalent quantity is emitted, and even if a length of the plate-shaped body 2 is different, a surface illumination whose luminance is roughly uniform can be obtained.

Inventors

• 👤 Tokihiko Masuzawa
• 👤 増沢　時彦
• 👤 Yoshitaka Kageyama
• 👤 義隆 景山
• 👤 Norizou Tomita
• 👤 富田　則三

Bibliographic Details