Image projection device

Abstract

Abstract PURPOSE:To improve the utilization efficiency of a light beam and to improve the brightness of projection light by disposing specular surfaces to a light source and a polarization beam splitter and also arranging a lambda/4 plate between the light source and polarization beam splitter. CONSTITUTION:A specular surface 6 is provided behind the light source 1, a specular surface 7 is provided on the opposite surface of the polarization beam splitter 2 from the light source 1, and the lambda/4 plate 8 is provided between the light source 1 and polarization beam splitter 2. A light beam from the light source 1 is made incident on the polarization beam splitter 2, only the S wave component in the light beam is reflected to illuminate a liquid crystal valve 3, and the P wave component in reflected light which is made incident on the polarization beam splitter 2 again is passed, so that a light beam which accords with the light and shade of an optical image is projected on a screen 5 through a lens 4. Consequently, the utilization efficiency of the light beam is increased and the brightness of the projection light is improved.

Inventors

• 👤 Susumu Nishikawa
• 👤 進 西川

Bibliographic Details