Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-11-20
2010-10-26
Sugarman, Scott J (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S676000
Reexamination Certificate
active
07821723
ABSTRACT:
A high power zoom lens system includes, in order from the object side: a first lens group having a positive refractive power and remaining stationary during zooming; a second lens group having a negative refractive power and moving during zooming; a third lens group and a fourth lens group having a positive refractive power and being movable relative to each other to correct image plane variation accompanied by zooming; and a fifth lens group having a positive refractive power and including an aperture diaphragm, the fifth lens group being used for forming an image. The second lens group and a composite lens group formed by combining the third lens group and the fourth lens group pass simultaneously through −1× magnification points of the groups during zooming from a wide-angle end to a telephoto end. The fourth lens group has at least one aspheric surface.
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patent: 5561560 (1996-10-01), Tsutsumi
patent: 7385766 (2008-06-01), Ohtake
patent: 2006/0132928 (2006-06-01), Nakatani et al.
patent: 195 08 278 A 1 (1995-10-01), None
patent: 3031598 (2000-02-01), None
patent: 2007-219473 (2007-08-01), None
Extended European Search Report, Mar. 8, 2010.
Birch & Stewart Kolasch & Birch, LLP
Fujinon Corporation
Sugarman Scott J
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