1989-10-05
1990-06-19
Sugarman, Scott J.
350432, G02B 1514, G02B 1318
Patent
active
049347969
ABSTRACT:
A zoom lens comprising, from front to rear, a positive first group for focusing, a negative second group as the variator, a negative third group as the compensator, a positive fourth group and a fifth group as the relay lens, the fourth group in the form of a bi-convex singlet and the fifth group in two parts with a widest spacing therebetween, of which the front part comprises a bi-convex first lens, a negative second lens whose front surface is concave toward front, and a positive third lens whose front surface is of strong curvature, and the rear part comprises a negative lens whose rear surface is concave toward rear, a bi-convex lens and a positive lens whose front surface is of strong curvature, satisfying the following conditions:
REFERENCES:
patent: 4621905 (1986-11-01), Kato et al.
patent: 4770510 (1988-09-01), Mukaiya
patent: 4812024 (1989-03-01), Mukaiya
patent: 4832471 (1989-05-01), Hamano
patent: 4846563 (1989-07-01), Mukaiya
Hamano Hiroyuki
Horiuchi Akihisa
Mukaiya Hitoshi
Sugiura Muneharu
Suzuki Nobuyoshi
Canon Kabushiki Kaisha
Sugarman Scott J.
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