Optical: systems and elements – Lens – With graded refractive index
Reexamination Certificate
2005-05-10
2005-05-10
Sugaman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With graded refractive index
C359S652000, C359S205100, C359S216100, C347S259000
Reexamination Certificate
active
06891678
ABSTRACT:
A lens for optical scanning condenses luminous flux deflected by an optical deflector to a plane to be scanned in a scanning image forming optical system. The lens is made of a plastic material by molding. A reference axis of an N-th order approximating curve of refractive index distribution Δn(x) of the lens is away from a center of a passing area, through which the luminous flux passes in the lens, by equal to or more than 10% of the width of the passing area.
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Dinh Jack
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh Company Limited
Sugaman Scott J.
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