Zoom lens

Details Zoom lens Zoom lens

1991-01-29

1993-08-31

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, 359692, G02B 1514

Patent

active

052414213

ABSTRACT:
A zoom lens is disclosed comprising a front lens group having a positive lens unit, a negative lens unit and a positive lens unit and whose overall refractive power is positive, and a rear lens group having a positive lens unit and a negative lens unit and whose overall refractive power is negative, wherein zooming is performed by varying all the lens separations between the successive two of the lens units and focusing is performed by varying at least the lens separation between the positive lens unit and the negative lens unit of the rear lens group.

REFERENCES:
patent: 4702567 (1987-10-01), Kato et al.
patent: 4789226 (1988-12-01), Ogata
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 4836663 (1989-06-01), Hirakawa
patent: 4842385 (1989-06-01), Tanaka
patent: 4861145 (1989-08-01), Kikuchi
patent: 5042927 (1991-08-01), Ogawa et al.

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