Optical: systems and elements – Compound lens system – Variable magnification
Reexamination Certificate
2007-06-05
2007-06-05
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Compound lens system
Variable magnification
C362S363000, C362S434000, C362S630000, C362S630000, C362S630000, C362S630000, C362S469000, C359S716000, C359S726000, C359S737000, C359S740000, C359S781000, C359S665000
Reexamination Certificate
active
11101933
ABSTRACT:
A zoom lens is disclosed having a zoom ratio larger than four with a field of view at the short focal length position larger than 85 degrees and with a minimal number of moving groups. The zoom lens utilizes a compound zoom structure comprising an NP or NPP zoom kernel followed by a P or PP zoom relay, with only two or three moving groups that can be used for both zooming, focusing and athermalization. An overall compact package size is achieved by the use of prisms to fold the optical path in strategic locations. An optional variable power liquid cell can provide close focusing with little or no focus breathing.
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Caldwell James Brian
Neil Iain A.
Lester Evelyn A.
Morrison & Foerster / LLP
Panavision International L.P.
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