Zoom lens

Details Zoom lens Zoom lens

1992-10-27

1993-07-13

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359685, 359713, G02B 1514, G02B 1318

Patent

active

052279200

ABSTRACT:
A compact zoom lens, which can attain a compact lens system while maintaining a simple lens arrangement including six lenses, and can minimize deterioration of performance caused by a variation upon assembling, is disclosed. The compact zoom lens includes a positive first lens group G.sub.1 and a negative second lens group G.sub.2. The first lens group G.sub.1 has, in turn from the object side, a positive meniscus lens component L.sub.1 with the convex surface facing the object side, a meniscus-shape junction negative lens component L.sub.2 constituted by a double-concave negative lens component L.sub.2n and a double-convex positive lens component L.sub.2p, and a double-convex positive lens component L.sub.3. The second lens group G.sub.2 has, in turn from the object side, a positive meniscus lens component L.sub.4 with the convex surface facing the image side, and a negative meniscus lens component L.sub.5 with the convex surface facing the image side, and at least one lens surface of the second lens group G.sub.2 is formed to have an aspherical surface shape. The zoom lens satisfies six conditions.

REFERENCES:
patent: 4679913 (1987-07-01), Sato et al.
patent: 4787721 (1988-11-01), Fukushima et al.
patent: 4818081 (1989-04-01), Ito
patent: 4836660 (1989-06-01), Ito
patent: 4911539 (1990-03-01), Tsunashima et al.
patent: 4929069 (1990-05-01), Shibayama
patent: 5144489 (1992-09-01), Shibayama

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