Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2011-08-09
2011-08-09
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000, C348S240300
Reexamination Certificate
active
07995283
ABSTRACT:
Provided is a zoom lens in which both higher-order components of distortion and lateral chromatic aberration are corrected in a retrofocus type optical system. The zoom lens includes, in order from a magnifying side, a first lens unit which is negative, a second lens unit which is positive, and a rear lens group which is positive. A solid material having high dispersion and high extraordinary dispersion is used for a negative lens included in the first lens unit to provide a suitable shape and refractive power.
REFERENCES:
patent: 7139131 (2006-11-01), Nanba et al.
patent: 7292398 (2007-11-01), Misaka
patent: 7480102 (2009-01-01), Yokoyama
patent: 7535652 (2009-05-01), Ichikawa et al.
patent: 7535654 (2009-05-01), Ohashi
patent: 7580202 (2009-08-01), Wada
patent: 7593171 (2009-09-01), Nishimura
patent: 7864453 (2011-01-01), Maetaki
patent: 2007/0053069 (2007-03-01), Yagyu et al.
patent: 2011/0002046 (2011-01-01), Wada et al.
patent: 2 196 837 (2010-06-01), None
patent: 2005-106878 (2005-04-01), None
patent: 2007-178894 (2007-07-01), None
Partial European Search Report issued in corresponding European Patent Application No. 09178763.0 dated Feb. 24, 2010.
Canon Kabushiki Kaisha
Rossi Kimms & McDowell LLP
Spector David N
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