Fisheye lens system

Details Fisheye lens system Fisheye lens system

2007-02-06

2007-02-06

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S725000, C359S755000, C359S761000, C359S762000, C359S691000, C359S680000, C359S749000

Reexamination Certificate

active

11168306

ABSTRACT:
A fisheye lens system with a half angle-of-view of 90° includes a negative front lens group, a diaphragm, and a positive rear lens group.The negative front lens group includes at least three negative meniscus lens elements each of which has the convex surface facing toward the object; and the three negative meniscus lens elements satisfy the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.2<SF(i=1)<0.6  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.8<SF(i=2)/SF(i=1)<1.5  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.8<SF(i=3)/SF(i=1)<2.0  (3)in-line-formulae description="In-line Formulae" end="tail"?whereinSFi designates the shaping factor of the ith(1≦i≦3) negative meniscus lens element (SFi=(R1i−R2i)/(R1i+R2i));R1idesignates the radius of curvature of the object-side surface of the ith(1≦i≦3) negative meniscus lens element; andR2idesignates the radius of curvature of the image-side surface of the ith(1≦i≦3) negative meniscus lens element.

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English Language Abstract of JP 7-84180.
English Language Abstract of JP 9-159912.
English Language Abstract of JP 2000-221391.

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