Ultra-wide angle objective lens

Details Ultra-wide angle objective lens Ultra-wide angle objective lens

2011-04-19

2011-04-19

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S752000, C359S749000, C359S713000, C359S714000, C359S715000

Reexamination Certificate

active

07929221

ABSTRACT:
A ultra-wide angle objective lens comprising a first group having a first lens element having a convex object surface facing the object and a concave image surface facing the image plane, and a second aspheric lens element, the second aspheric lens element having a varying power that is negative at its vertex; and that increases positively with radial distance from the vertex. A second group has at least one lens element and a positive power. A third group has at least a first and a second lens element and a positive power. The ratio of the total track to the focal length satisfies the condition that TT/fo=<33 and the image height on a focal plane is h(θ)>f*θ, where h(θ) is the image height formed by an off-axis chief ray having a field angle θ, and f is the effective focal length of the lens.

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patent: 7301578 (2007-11-01), Ohzawa et al.
patent: 2005/0219715 (2005-10-01), Kimura et al.

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