| 摘要 |
PROBLEM TO BE SOLVED: To provide a reflective screen which is formed so that the lowering of the peripheral luminance of the screen may be small and which need not be tilted even when the direction of projected light from a projection device is restricted. SOLUTION: The reflection surface 101 of the reflective screen 10 presents circular Fresnel shape formed by arranging many minute irregularities, that is, many circular-arc shaped reflection base surfaces 101a having prescribed width, for example, the width of about 0.1mm to be concentric circles, and the respective surfaces 101a of the circular Fresnel shape themselves constitute a reflection surface reflecting the projected light 11a from the projection device 11 in parallel with each other in a direction perpendicular to the front surface of the screen 10. COPYRIGHT: (C)2005,JPO&NCIPI
|
