Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2005-08-02

2005-08-02

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S680000

Reexamination Certificate

active

06924947

ABSTRACT:
A wide-angle lens system includes a negative first lens group, and a positive second lens group, in this order from the object. The groups are positioned so that the distance between the negative first lens group and the positive second lens group is set as the maximum distance in the wide-angle lens system. The wide-angle lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?2.0<fB/f<2.5  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?4.5<f1/f<6.2  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.8<f2/f<2.0  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<d/f<1.5  (4)in-line-formulae description="In-line Formulae" end="tail"?whereinfB: the back focal distance of the wide-angle lens system; f: the entire focal length of the wide-angle lens; f1:the focal length of the negative first lens group; f2:the focal length of the positive second lens group; and d: the axial distance between the negative first lens group and the positive second lens group.

REFERENCES:
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patent: 2000-039553 (2000-02-01), None
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