| 摘要 |
A real image of a point source of radiation is formed in space by a light beam modulated to convey information and reflected from a rotating prism. The rotation of the prism causes the image to move along a limacon curve. The moving image is reflected by a Mangin mirror and a second real image is formed on a photographic film strip. The second image remains in focus as it traverses a straight line on the film strip with a speed directly proportional to the tangent of the angle formed by the scanning beam by which the second image is formed with a line normal to the straight line traversed by the second image.
|
