| 摘要 |
PURPOSE:To let the light distribution of projected screen become even by using correcting filters which are made thinner in density as they go closer to the periphery to the lighting optical path of the photographic printer. CONSTITUTION:A diffusion plate 80 is given with such patterns that they become coarser as they go toward the periphery from the center by printing, spraying, etching, etc by white ink. Hence, the light out from a light source 10 is made to the overall evenly distributed light by the correcting plate 80 in the diffusion box 30, whereby the even distribution may be obtained over the entire part of the screen of the images on the original plate projected to printing paper 70. |
