Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-12-25
2007-12-25
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S775000, C359S771000, C359S760000, C359S756000
Reexamination Certificate
active
11450663
ABSTRACT:
At least one exemplary embodiment is directed to an optical system which includes a plurality of refractive optical elements arranged substantially symmetrically with respect to an aperture-stop. Furthermore the optical system comprises a refractive optical element being constituted by a solid material. An Abbe number νd of the solid material and a partial dispersion ratio θgF of the solid material can satisfy the following conditions:in-line-formulae description="In-line Formulae" end="lead"?θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+1.011)<0.in-line-formulae description="In-line Formulae" end="tail"?
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patent: 2001-337271 (2001-12-01), None
Canon USA Inc. IP Division
Spector David N.
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