Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-08-22
2006-08-22
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S684000, C359S685000, C359S716000, C359S740000, C359S785000, C359S788000
Reexamination Certificate
active
07095564
ABSTRACT:
A third group of lenses is constructed by subsequently arranging those four lenses from an object side to an image side which include a positive lens, a cemented lens of a positive lens and a negative lens, and a positive lens, both of a surface of the third group of the lenses nearest to the object side and a surface of the third group of the lenses nearest to the image side are so aspheric that positive refractive power becomes gradually weaker as a location of the third group of the lenses departs from an optical axis; and a following conditional formula is satisfied:in-line-formulae description="In-line Formulae" end="lead"?−0.5<(Y′ max/R34I)<0.0in-line-formulae description="In-line Formulae" end="tail"?where R34Iis a curvature radius of the surface of the third group of the lenses nearest to the image side, and Y′ max is a maximum image height.
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Lester Evelyn A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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