Compact zoom lens

Details Compact zoom lens Compact zoom lens

1976-11-01

1978-06-13

Clark, Conrad J.

G02B 1518

Patent

active

040945863

ABSTRACT:
A zoom lens comprising, as viewed from the side of a photographing object, a first lens group, which is positive and is provided for focusing, including a positive lens formed by joining a negative lens and a positive lens together and a positive meniscus lens; a second lens group, which is negative and is provided for variation, including a negative lens and another negative lens formed by joining a negative lens and a positive lens together; a third lens group, which is provided for compensation, including a positive lens formed by joining a negative lens and a positive lens together; a fourth lens group which is positive and is provided for image formation; and a fifth lens group which is weakly negative, the third lens group drawing a concave locus toward the object side as the second lens group moves in the direction of an optical axis. The fourth lens group is composed of two positive meniscus lenses closedly adjacent to each other and a biconcave lens disposed apart from these meniscus lenses. The fifth lens group is composed of a biconvex lens, a negative lens disposed with its concave face directed toward the object and a positive lens disposed with its convex face toward the object.

REFERENCES:
patent: 3972591 (1976-08-01), Suwa
patent: 4025167 (1977-05-01), Ikeda

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