Zoom lens

Details Zoom lens Zoom lens

1992-09-10

1993-08-10

Bovernick, Rodney B.

Optical: systems and elements

Lens

With variable magnification

359687, 359715, 359774, 358225, G02B 1514, G02B 1318, G02B 934, H04N 5225

Patent

active

052354660

ABSTRACT:
A zoom lens comprises sequentially from a side of an object: a fixed first lens group constituted by a convex lens, a double convex lens and a meniscus convex lens; a movable second lens group constituted by a meniscus convex lens, a double concave lens and a convex lens; a fixed third lens group constituted by a single lens having at least one aspherical surface; and a movable fourth lens group constituted by a concave lens and two convex lenses at least one of which has at least one aspherical surface.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.
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.
Tanaka, K. "A Novel Configuration of Zoom Lens" Optik vol. 73, No. 4 (1986) pp. 157-159.

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