| 摘要 |
PURPOSE:To reduce the exposure time and the time required to make a plate by using a television camera at a photoelectric conversion section and by carrying out main scanning by means of a rotary mirror at an exposure section without rotating a film to be exposed. CONSTITUTION:A photoelectric conversion section 1 is composed of a frame for fixing an original for printing, a light source 4 and a television camera 5 for photoelectric conversion and three-color separation, and the number of scanning lines is regulated to 1125. An exposure section 3 is composed of an optical system for exposing a film and a mechanically driving part for scanning exposure, and to increase the scanning speed main scanning is carried out by means of a rotary mirror 18 with small mass. Laser light used to expose a film 20 impinges on the mirror 18, reflects at a right angle and reaches the film 20. At this time, the mirror 18 is rotated to carry out the main scanning of light. |
