Optical: systems and elements – Lens – With variable magnification
Patent
1990-02-06
1991-09-24
Dzierzynski, Paul M.
Optical: systems and elements
Lens
With variable magnification
359676, 359708, G02B 1500
Patent
active
050509721
ABSTRACT:
A zoom lens comprising, from front to rear, a first group of positive power for focusing, a second group of negative power for varying the image magnification, a third group of negative power for compensating for the image shift, a fourth lens group of positive power in the form of a bi-convex lens whose rear surface is stronger in curvature than the front surface, a stop, and an image forming fifth group, the fifth groug being divided into two parts of which the front part comprises a bi-convex first lens, a negative second lens having a concave front surface and a positive third lens of stronger front curvature and the rear part comprises a negative fourth lens having a concave rear surface, a bi-convex fifth lens and a positive sixth lens of stronger front curvature, and the zoom lens satisfying the following conditions:
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Hamano Hiroyuki
Horiuchi Akihisa
Mukaiya Hitoshi
Sugiura Muneharu
Suzuki Nobuyoshi
Canon Kabushiki Kaisha
Dzierzynski Paul M.
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