| 摘要 |
PURPOSE:To control the quantity of exposure independently and continuously by adjusting voltage to be applied to three cathode-ray tubes for monochromatic light corresponding to the three primary colors of light. CONSTITUTION:Illuminating light IL from a red color cathod-ray tube 1, a green color cathod-ray tube 2 and a blue color cathod-ray tube 3 are sent to the inside of a miror box 4 through a diffusing plate 61 of a mixing box 6, so that these light is mixed through the reflection by a mirror 41 and diffused and outputted by a diffusing plate 62. The mixed and diffused light ML is irradiated to a photographic negative 5 and the transmitted light TL through a negative 5 is irradiated to a sheet of printing paper which is not shown in the drawing. The quantity of exposure of each color to the printing paper is independently controlled by adjusting voltage ER, EG and EB applied to the cathod-ray tubes 1, 2 and 3 respectively. |
