Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2008-12-05
2009-12-01
Thompson, Timothy J (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S784000, C359S785000
Reexamination Certificate
active
07626771
ABSTRACT:
An optical system in which a maximum value of a height from an optical axis of a paraxial marginal ray closer to an expanded side than a point of intersection between an optical axis and a paraxial chief ray, includes a lens unit Lr including at least one refractive optical element Gn of a negative refractive power. In the optical system, νd (Gn) as an Abbe number of a material of the refractive optical element Gn, θgF (Gn) as a partial dispersion ratio regarding g and F-lines, FGn as a focal lengths of the refractive optical element Gn, and Fr as focal lengths of the lens unit Lr are set appropriately.
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Canon Kabushiki Kaisha
Canon U.S.A. Inc. IP Division
Thompson Timothy J
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