| 摘要 |
PCT No. PCT/GB86/00203 Sec. 371 Date Dec. 12, 1986 Sec. 102(e) Date Dec. 12, 1986 PCT Filed Apr. 11, 1986 PCT Pub. No. WO86/06181 PCT Pub. Date Oct. 23, 1986.An optical scanning system for projecting an image onto a moving surface comprises four reflecting surfaces, a first or scan reflecting surface to deflect an incident light ray into a first direction, second and third reflecting surfaces mutually at right angles which together reflect the ray from the first reflecting surface in a direction opposite to the first direction and displaced laterally therefrom, and a fourth or exit reflecting surface to receive the ray reflected from the third reflecting surface and to deflect it parallel to the incident ray onto the moving surface. The scan and exit reflecting surfaces are maintained at right angles to each other as they are translated in opposite directions during a full scan of the image. The second and third reflecting surfaces are translated together in the same direction as the scan reflecting surface, and the translations of the scan and exit reflecting surfaces are effected at respective uniform rates each of which has a fixed ratio to the rate of movement of the moving surface. Rocking or tipping of the scan and exit reflecting surfaces during translation is effected automatically by a cam and cam follower for each.
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