Compact wide-angle zoom lens

Details Compact wide-angle zoom lens Compact wide-angle zoom lens

1982-01-13

1983-09-27

Corbin, John K.

G02B 1514

Patent

active

044065230

ABSTRACT:
A high performance compact wide angle zoom lens, composed, in order from the object side, of a divergent front lens group and a convergent rear lens group, wherein the front and rear lens groups are moved mechanically to thereby vary the overall focal length. The front lens group being composed, in order from the object side, of a first lens including a negative meniscus lens convex to the object, a second lens including a positive biconvex lens, a third lens including a negative meniscus lens convex to the object, a fourth lens including a negative lens and a fifth lens including a positive lens. The rear lens group being composed of a sixth lens including a positive lens, a seventh lens including a positive meniscus lens convex to the object, an eighth lens including a biconvex positive lens, a ninth lens including a biconcave negative lens, a tenth lens including a positive lens and an eleventh lens including a positive lens. The ninth lens being cemented to said eighth lens so that the wide angle zoom lens as a whole includes eleven lens elements grouped into ten lens components.

REFERENCES:
patent: 4159865 (1979-07-01), Kawamura et al.
patent: 4169660 (1979-10-01), Nakamura
patent: 4241981 (1981-12-01), Okudaira

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