Finite distance zoom lens

Details Finite distance zoom lens Finite distance zoom lens

1987-07-22

1989-12-26

Sugarman, Scott J.

G02B 1514

Patent

active

048894168

ABSTRACT:
A zoom lens includes a negative first group disposed on the enlarging side and comprising, in succession from the enlarging side, a negative first lens whose reducing side surface has a sharper curvature than the enlarging side surface, a positive second lens whose enlarging side surface has a sharper curvature than the reducing side surface, and a negative third lens, and a positive second group disposed on the reducing side. The spacing between the first group and the second group is variable to accomplish a magnification change.

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4241981 (1980-12-01), Okudaira
patent: 4406523 (1983-09-01), Sato et al.
patent: 4474436 (1984-10-01), Itoh
patent: 4477153 (1984-10-01), Suda et al.
patent: 4571031 (1986-02-01), Kato
patent: 4653873 (1987-03-01), Kawamura

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