Zoom lens

Details Zoom lens Zoom lens

1998-12-01

2000-07-04

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359686, 359687, 359688, G02B 1514

Patent

active

060847212

ABSTRACT:
A zoom lens has, in succession from the object side, a first lens unit fixed during a focal length change and having positive refractive power, a second lens unit moved along the optical axis thereof during the focal length change, a third lens unit for correcting the fluctuation of the image plane resulting from the focal length change, and a fourth lens unit fixed during the focal length change and having positive refractive power. The second lens unit has a lens subunit of negative refractive power and a lens subunit of positive refractive power. The lens subunits are moved at different speeds during the focal length change, and the conditions of the lens are satisfied to correct the fluctuations in aberration during the focal length change.

REFERENCES:
patent: 5136431 (1992-08-01), Terasawa et al.
patent: 5179472 (1993-01-01), Ohno et al.
patent: 5191475 (1993-03-01), Terasawa et al.
patent: 5636060 (1997-06-01), Suzuki
patent: 5675439 (1997-10-01), Nakatsuji
patent: 5737128 (1998-04-01), Usui
patent: 5760967 (1998-06-01), Terasawa et al.
patent: 5790316 (1998-08-01), Terasawa et al.
patent: 5815323 (1998-09-01), Abe et al.
patent: 5917658 (1999-06-01), Yamanashi

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