Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2007-04-24

2007-04-24

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S749000, C359S793000

Reexamination Certificate

active

11302163

ABSTRACT:
A wide-angle lens system includes a positive front lens group, a diaphragm, and a positive rear lens group. The front lens group includes a negative first-sub-lens group and a positive second-sub-lens group.The negative first-sub-lens group includes a negative lens element, a positive lens element, and a negative lens element.The front lens group satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.5<f/|f1a|<0.75  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<|f1a|/f1b<1.0  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.35<f/f1bi<0.6  (3)in-line-formulae description="In-line Formulae" end="tail"?wherein f: the focal length of the entire lens system; f1a: the focal length of the negative first-sub-lens group; f1b: the focal length of the positive second-sub-lens group; f1bi: the focal length of the most image-side surface of the positive second-sub-lens group; r1bi: the radius of curvature of the most image-side surface of the positive second-sub-lens group; and N1bi: a refractive index of the most image-side lens element of the positive second-sub-lens group.

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English Language Abstract of JP 5-188294.
English Language Abstract of JP 7-063986.
English Language Abstract of JP 9-127413.
English Language Abstract of JP 2001-208967.

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