Ultra wide angle imaging optical system, ultra wide angle...

Details Ultra wide angle imaging optical system, ultra wide angle... Ultra wide angle imaging optical system, ultra wide angle...

2006-12-11

2008-11-25

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Anamorphic

C359S668000, C359S749000, C359S750000

Reexamination Certificate

active

07457044

ABSTRACT:
An ultra wide angle imaging optical system includes, in order from an object side, a first lens group, an aperture stop, and a second lens group. The first lens group includes, in order from the position closest to the object side, a negative meniscus lens element convex to the object side, a negative lens element, and a negative lens element. The second lens group includes a plurality of positive lens elements. The first lens group and the second lens group each includes at least one anamorphic surface having different optical powers with respect to a first section extending in a first direction on a flat plane substantially orthogonal to an optical axis, and with respect to a second section extending in a second direction substantially orthogonal to the first direction. The first lens group includes the lens element satisfying the following conditional formula (1):in-line-formulae description="In-line Formulae" end="lead"?−0.6<(Ph−Pv)*(fh+fv)<−0.1  (1)in-line-formulae description="In-line Formulae" end="tail"?wherePh: an optical power in the first direction where a viewing angle is large;Pv: an optical power in the second direction where the viewing angle is small;fh: a focal length in the first direction with respect to the entirety of the optical system; andfv: a focal length in the second direction with respect to the entirety of the optical system.

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