Zoom lens system for covering superwide-angle area

Details Zoom lens system for covering superwide-angle area Zoom lens system for covering superwide-angle area

2005-01-18

2005-01-18

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S752000

Reexamination Certificate

active

06844987

ABSTRACT:
A zoom lens includes first to fourth lenses in order from an object side. The first lens has negative refracting power and a concave surface thereof faces the object side. The second and fourth lenses have positive refracting power. The third lens has negative refracting power. The zoom lens as a whole is constituted of a first lens group having positive refracting power, and a second lens group having negative refracting power. The following conditions are satisfied, −2.7<fs/f1<−1.7 −1.1<f1/f2<−0.9 and 1.0<r1/f1<3.0, wherein fs denotes a focal length of the overall system at a wide-angle end, f1and f2denote focal lengths of the first and second lenses respectively, and r1denotes a radius of curvature at the object side of the first lens.

REFERENCES:
patent: 5610767 (1997-03-01), Ito
patent: 20010036021 (2001-11-01), Enomoto
patent: 20020041449 (2002-04-01), Eguchi et al.
patent: 6-82696 (1994-03-01), None
patent: 7-146439 (1995-06-01), None
patent: 2001-343586 (2001-12-01), None

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