Zoom lens

Details Zoom lens Zoom lens

1992-02-13

1993-07-20

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

052298868

ABSTRACT:
A zoom lens is disclosed, comprising, from front to rear, first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power, a fourth lens unit of positive refractive power and a fifth lens unit of positive refractive power, the second and fourth lens units moving forward to vary the focal length from the wide-angle end to the telephoto end, and the first lens unit moving in a locus convex toward the image side to compensate for the image shift with zooming, wherein the following conditions are satisfied:

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4516839 (1985-05-01), Tokumaru
patent: 4527867 (1985-07-01), Fujioka et al.
patent: 4776680 (1988-10-01), Tanaka
patent: 4781446 (1988-11-01), Tanaka et al.
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 4865434 (1989-09-01), Matsushita et al.
patent: 5059007 (1991-10-01), Tanaka

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