Zoom lens

Details Zoom lens Zoom lens

1992-09-17

1993-11-30

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359687, 359715, 358225, G02B 1514, G02B 1318, G02B 302, H04N 5225

Patent

active

052670821

ABSTRACT:
A zoom lens includes sequentially from an object side toward an image surface side a fixed first lens group, a movable second lens group, a fixed third lens group, and a movable fourth lens group. The fixed first lens group is constituted by a first concave lens, a first convexo-convex lens, a second concave lens, a second convexo-convex lens and a meniscus convex lens. The movable second lens group is constituted by a meniscus concave lens, a concavo-concave lens and a convex lens. The fixed third lens group is constituted by a single lens having at least one aspherical surface. The movable fourth lens group is constituted by a concave lens and a convex lens, at least one of which has at least one aspherical surface.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.
patent: 4756608 (1988-07-01), Itoh
patent: 4802747 (1989-02-01), Horiuchi
patent: 4818083 (1989-04-01), Mihara
patent: 4859042 (1989-08-01), Tanaka
patent: 5100223 (1992-03-01), Ono et al.

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