Zoom lens system and camera using the same

Details Zoom lens system and camera using the same Zoom lens system and camera using the same

2005-09-13

2005-09-13

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S681000, C359S682000, C359S691000

Reexamination Certificate

active

06943958

ABSTRACT:
The zoom lens system and camera using the same include, in order from an object side, a first lens group having negative refracting power and a second lens group having positive refracting power. Zooming is carried out at least by changing the distance between the first and second groups. The first lens group includes six lenses, a first lens which is negative meniscus lens having a concave surface toward an image side, a second lens which is negative meniscus lens having a concave surface toward the image side, a third lens which is negative lens having a concave surface toward the image side, a fourth lens which is positive lens having convex surfaces, a fifth lens having negative power and a sixth lens having positive power. The second lens group includes six lenses and the following condition is satisfied.in-line-formulae description="In-line Formulae" end="lead"?0.07<d12/f2G<0.30in-line-formulae description="In-line Formulae" end="tail"?where d12is an air space on an optical axis between the first lens and the second lens in the second lens group, and f2G is a focal length of the second lens group.

REFERENCES:
patent: 4147410 (1979-04-01), Shimomura et al.
patent: 60-130712 (1985-07-01), None
patent: 62-200316 (1987-09-01), None
patent: 10-082954 (1998-03-01), None

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