Image projector

Abstract

Abstract PURPOSE:To improve a light utilizing efficiency by combining a polarized beam splitter and a prism. CONSTITUTION:A natural light radiated from a light source 2 is reflected at an ellipse reflecting mirror 1, converged to another focus, made into parallel lights by a lens 3 and made incident on a polarized beam splitter 4. Reflected S polarized components 12 are reflected at a prism 5 and transmitted through a 1/2 wavelength plate 6, thereby, a polarizing surface is rotated by 90 deg., and P polarized components 11 and a polarizing direction are made parallel. Respective components are converged by lens 14A and 14B, they are totally reflected two times in parallelogram type prisms 15A and 15B, both lights are made approach, they can be made incident on a liquid crystal layer 7 as the parallel lights by a superposing lens 16, and they are projected through a polarizer 8 onto a screen 10 by a lens 9. Thus, the energy consumption of the light source necessary for obtaining the picture of the brightness of the screen can be saved.

Inventors

• 👤 Takayuki Waseda
• 👤 隆行 和瀬田
• 👤 Kenji Matsumoto
• 👤 健志 松本
• 👤 Mikinobu Hoshino
• 👤 干野　幹信

Bibliographic Details