Zoom lens system

Details Zoom lens system Zoom lens system

1998-06-12

2000-02-22

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359676, 359683, 359689, 359695, G02B 1514

Patent

active

060287179

ABSTRACT:
Sequentially from the object side: a first lens unit having positive optical power; a second lens unit having negative optical power; and a third lens unit having positive optical power, wherein said first and second lens units normally move in opposite directions whereas the third lens unit moves linearly to the object side during zooming from the wide angle end to the telephoto end, and wherein the following conditional equation is satisfied:

REFERENCES:
patent: 4506958 (1985-03-01), Imai
patent: 4836662 (1989-06-01), Ogata et al.
patent: 5257135 (1993-10-01), Kohno et al.
patent: 5543970 (1996-08-01), Hata et al.

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