| 摘要 |
1,271,418. Projection apparatus; screens. FUJI PHOTO FILM CO. Ltd. Aug. 15, 1969 [Aug. 23, 1968], No.40873/69. Heading G2A. Images A and B are projected in superposition on a screen 10 by obliquely directed projectors 20, 30, the screen having a strongly directional reflectivity such that the images A or B may be viewed separately from different positions determined by the angles of projection. The projection beams are directed slightly downwards from above the observers, and depending on the screen surface, more than two projectors may be used. In another embodiment, the projectors are angularly separated in a vertical plane for high and low level viewing. Aluminium foil is rolled to produce a screen with the necessary surface. |
