Zoom lens

Details Zoom lens Zoom lens

1989-05-23

1991-01-29

Sugarman, Scott J.

G02B 1514

Patent

active

049881744

ABSTRACT:
A zoom lens comprises, from an object side to an image plane side, a positive first lens unit for focusing, a negative second lens unit as the variator, a negative third lens unit as the compensator, a positive fourth lens unit for producing an almost diverging light beam, and an image forming fifth lens unit. The fifth lens unit includes a bi-convex first lens, a negative second lens having a concave surface facing the object side, a bi-convex third lens having a strong refracting surface facing the object side, a negative fourth lens having a concave surface facing the image plane side, a bi-convex fifth lens having a strong refracting surface facing the image plane side, and a bi-convex sixth lens having a strong refracting surface facing the object side. The zoom lens satisfies the following conditions:

REFERENCES:
patent: 4621905 (1986-11-01), Kato et al.
patent: 4770510 (1988-09-01), Mukaiya
patent: 4812024 (1989-03-01), Mukaiya
patent: 4832471 (1989-05-01), Hamano
patent: 4846563 (1989-07-01), Mukaiya

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