Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-03-23
2008-11-25
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000, C359S682000, C359S689000
Reexamination Certificate
active
07457050
ABSTRACT:
A five-element 3:1 zoom lens system in which the first lens group has a negative power and includes two lens elements and the second lens group has a positive power and includes a pair of lens sub-groups, the first sub-group having a positive power and including a pair of lens elements and the second sub-group having a positive power and including a single lens element. In one embodiment the second sub-group remains stationary relative to the location of the image plane and in another embodiment the second sub-group remains stationary relative to the first sub-group while they are moved relative to the location of the image plane. Several of the lens element surfaces are aspherical. The second lens element of the first sub-group is relatively thick and has a relatively high optical power. The overall length of the lens system is relatively short.
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Crouch Robert G.
Flextronics AP LLC
Greece James R
Marsh & Fischmann & Breyfogle LLP
Sugarman Scott J.
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