Zoom lens

Details Zoom lens Zoom lens

1994-09-08

1996-07-16

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

055372554

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power and a fifth lens unit of positive refractive power, the second lens unit being axially moved toward the image side to effect zooming from the wide-angle end to the telephoto end, while simultaneously moving the fourth lens unit to compensate for the shift of an image plane, and the fourth lens unit being axially moved to effect focusing, wherein the following condition is satisfied:

REFERENCES:
patent: 4501475 (1985-02-01), Fujita et al.
patent: 4702567 (1987-10-01), Kato et al.
patent: 5202992 (1993-04-01), Banno et al.
patent: 5414562 (1995-05-01), Ueda

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