Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2006-04-11
2006-04-11
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S688000, C359S768000
Reexamination Certificate
active
07027236
ABSTRACT:
An original reading lens includes a four-group, five-element lens configuration including three positive lenses and two negative lenses, wherein the positive lens is constructed by a glass material of low dispersion, and the negative lens is constructed by a glass material of high dispersion, a partial dispersion θgd is defined by θgd=(ng−nd)/(nF−nc) by a refractive index nd of d line (587.56 nm), a refractive index nc of c line (656.27 nm), a refractive index nF of F line (486.13 nm), and a refractive index ng of g line (435.83 nm), a straight line connecting a coordinate point of a reference glass material K7, K7(θgd, υd) and a coordinate point of a reference glass material F2, F2(θgd, υd) on a plane with a coordinate system including the partial dispersion θgd and an Abbe number υd as orthogonal two axes is adopted as a reference line, and a partial dispersion deviation δθgd which is the deviation from the reference line of the partial dispersion θgd of the material is positive in one or more positive lens.
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Epps Georgia
Harrington Alicia M
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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