Zoom lens

Details Zoom lens Zoom lens

1996-03-25

1998-06-02

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359676, 359684, G02B 1514

Patent

active

057609667

ABSTRACT:
In five constituent lens groups, the fourth lens group from the object side is made as a negative lens. This fourth lens group is moved in order to correct zooming and focusing, while predetermined conditional expressions are satisfied, thereby yielding a zoom lens which can attain a wide angle, a large zoom ratio, and favorable aberrations. This zoom lens has five groups respectively composed of positive, negative, positive, negative, and positive lens groups. At the time of zooming, the first, third, and fifth lens groups G1, G3, and G5 are fixed, while the second and fourth lens groups G2 and G4 are made movable. As the second lens group G2 is moved in the optical axis direction, the focal length of the whole system is changed. As the fourth lens group G4 is moved in the optical axis direction, fluctuation in imaging position is corrected while change in the imaging position due to change in object distance is corrected. This zoom lens is further configured so as to satisfy the following conditional expressions (1) to (3):

REFERENCES:
patent: 4189213 (1980-02-01), Iizuka
patent: 5585969 (1996-12-01), Endo

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