Zoom lens and optical apparatus having the same

Details Zoom lens and optical apparatus having the same Zoom lens and optical apparatus having the same

1999-09-03

2000-09-12

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

061185930

ABSTRACT:
A zoom lens of the rear-focus type includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The variation of magnification from a wide-angle end to a telephoto end is effected by moving the second lens unit toward the image side. Shifting of an image plane caused by the variation of magnification is compensated for by moving the fourth lens unit. Focusing is effected by moving the fourth lens unit. The second lens unit consists of, in order from the object side to the image side, a negative lens, a negative lens, a positive lens and a negative lens, the third lens unit comprises a plurality of positive lenses and a negative lens, and the fourth lens unit consists of a negative lens and a positive lens, and wherein the following condition is satisfied:

REFERENCES:
patent: 4859042 (1989-08-01), Tanaka
patent: 5530592 (1996-06-01), Tochigi
patent: 5537255 (1996-07-01), Tochigi
patent: 5612825 (1997-03-01), Horiuchi et al.
patent: 5712733 (1998-01-01), Mukaiya
patent: 5847882 (1998-12-01), Nakayama
patent: 5963378 (1999-10-01), Tochigi et al.
patent: 5978153 (1999-11-01), Nishio
patent: 6010537 (2000-01-01), Konno

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