| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection lens reduced in the variation of a pupil position in the case of varying power. SOLUTION: The projection lens incorporated in an enlargement projection device has an aperture diaphragm which does not have a refracting power for determining an aperture ratio. The aperture diaphragm is structured so as to move within an optical system in the direction of an optical axis independently of a lens and a lens group which have the other refracting powers. COPYRIGHT: (C)2005,JPO&NCIPI
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