Zoom lens

Details Zoom lens Zoom lens

1984-01-09

1988-12-20

Corbin, John K.

350427, G02B 1500

Patent

active

047922150

ABSTRACT:
A zoom lens of a compact size and good performance comprises a front diverging lens group and a rear converging lens group which are mechanically movable for variable power, the front diverging lens comprising a first lens of negative meniscus which is convex toward an object, a second negative lens, and a third lens of positive meniscus which is convex toward the object, the rear converging lens comprising a fourth positive lens, a fifth positive lens, a sixth negative lens, and a seventh positive lens, there being an aperture disposed more closely than the rear group to the object and movable with the rear group.

REFERENCES:
patent: 4074931 (1978-02-01), Okudaira
patent: 4195912 (1980-04-01), Doi et al.
patent: 4323302 (1982-04-01), Kimura
Abstract from Official Gazette, published Apr. 19, 1983, U.S. Pat. No. 4,380,375.
Abstract from Official Gazette, published Nov. 19, 1974, U.S. Pat. No. 3,848,969.

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