| 摘要 |
PURPOSE:To duplicate a microfilm with high resolution by enlarging the filament image of an illumination lamp by the 1st condenser lens system, forming luminous flux with the uniform quantity of light over the section by a light scattering member, and converging and expanding the luminous flux by the 2nd condenser lens system and then making the luminous flux incident on an image forming lens to the overall effective aperture diameter. CONSTITUTION:Luminous flux emitted by the illumination lamp 1 is converted into circular luminous flux having specific sectional area through the 1st condenser lens system 2, light scattering plate 9, and a stop mechanism 7 and this luminous flux operates as a secondary light source as a substitute for the illumination lamp 1. Luminous flux emitted by the stop mechanism 7 while converged and expanded by the 2nd condenser lens system 10 is incident on a reflecting mirror 14 and bent by about 90 deg. through the reflecting mirror 14 to illuminate the entire rectangular image area of one frame of an original film 15. Then, luminous flux transmitted through the original film 15 is incident on the entire effective aperture diameter area of the image forming lens 17 to the uniform quantity of light and then incident on a photographic film for duplication through a photographic optical member, thereby projecting an optical image.
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