Optical: systems and elements – Lens – Reverse telephoto
Reexamination Certificate
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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