| 摘要 |
PURPOSE:To obtain a light projected picture by imposing brightness modulation by a video signal through an optical system consisting of a polarizer and an analyzer, and a rotatory polarization part where plural of rotatory polarization control parts formed of electrooptic materials are arrayed linearly. CONSTITUTION:Light from a light source 1 is projected upon a rotatory polarization part 11 supported on a transparent supporting plate 10 through a rectangular opening plate 6, polarizer 7, semicylindrical lens 8, and mirror 9. The rotatory polarization part 11 is constituted by arraying plural of rotatory polarization control parts 19 formed of electrooptic materials on a circular transparent supporting plate 10. Those control parts 19 each have a pair of electrodes and terminal groups 21 and 22 for supplying a voltage to those electrodes. When luminous flux 20 having flat section in a thin beltlike shape passes through those control parts 19, the plane of polarization is rotated by a video signal input 18. The light modulated as mentioned above is projected on a screen by a projection lens 17, as brightness-modulated light by an analyzer 12, through scanning mirror 14. Thus, a bright picture is obtained. |
