Zoom lens

Details Zoom lens Zoom lens

1988-05-05

1989-03-14

Corbin, John K.

G02B 1514

Patent

active

048120243

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power as the variator, a third lens unit of negative power as the compensator, an afocal fourth lens of positive power, and a fifth lens unit for image formation, the fifth lens unit including, from front to rear, a bi-convex first lens whose front surface is of stronger curvature, a negative meniscus second lens of forward concavity, a positive third lens whose front surface is of stronger curvature, a negative meniscus fourth lens of forward convexity, a bi-convex fifth lens whose rear surface is of stronger curvature, and a positive sixth lens whose front surface is of stronger curvature, wherein the following conditions are satisfied:

REFERENCES:
patent: 3336094 (1967-08-01), Macher
patent: 4618220 (1986-10-01), Kato
patent: 4621905 (1986-11-01), Kato et al.
patent: 4699474 (1987-10-01), Ozawa
patent: 4720181 (1988-01-01), Hata

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