| 摘要 |
PURPOSE:To obtain uniform luminous intensity in the direction parallel to a linear light source, and to obtain uniform distribution of luminous intensity in perpendicular direction avoiding loss of amount of light by providing a lenticular in the same axis with longitudinal direction of the linear light source, and diffusing light only in perpendicular direction. CONSTITUTION:A photographic enlarger is constituted by arranging xenon tubes 1a-1c parallel to each other and installing tri-color filters 2a-2c for adjusting color temperature, condenser lenses 3, 6, a projection lens 8 etc. in the front. A negative film 7 is projected on a projection plane 9. Nearly parallel light is made incident to a lenticular 4 and its pitch line is parallel to lingitudinal direction of xenon tubes 1a-1c. By this constitution, and using a linear light source, light is diffused in the direction perpendicular to the linear light source. Consequently, distribution of luminous intensity in perpendicular direction is made uniform avoiding loss of amount of light due to useless diffusion of light. Further, loss of light due to diffusion is reduced by limiting the angle of diffusion of light within a specified range by the use of the lenticular. |
