Compact zoom lens

Details Compact zoom lens Compact zoom lens

1990-07-13

1991-03-12

Arnold, Bruce Y.

G02B 1514, G02B 964

Patent

active

049988085

ABSTRACT:
A zoom lens has a compact and simple structure, with satisfactorily corrected aberration and with a zooming ratio exceeding 2.0. The lens has a first lens group G.sub.1 of a positive refractive power and a second lens group G.sub.2 of a negative refractive power arranged in this order from the object side and effecting zooming operation by varying the distance of the lens groups. The first lens group G.sub.1 has a front group G.sub.F of a positive refractive power and a rear group G.sub.R of a positive refractive power, arranged in this order from the object side. The front group G.sub.F comprises a positive meniscus lens L.sub.11 convex to the object side, a negative lens L.sub.12 concave to the object side, a positive lens component L.sub.13 and a positive lens component L.sub.14, arranged in this order from the object side. The rear group G.sub.R comprises a positive lens L.sub.15, and the second lens group G.sub.2 comprises a positive meniscus lens L.sub.21 convex to the image side, a negative lens L.sub.22 , and a negative meniscus lens L.sub.23 concave to the object side, arranged in this order from the object side. The lens satisfies following conditions:

REFERENCES:
patent: 4911539 (1990-03-01), Tsunashima et al.
patent: 4929069 (1990-05-01), Shibayama

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