Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2008-10-01
2010-02-16
Sugarman, Scott J (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S651000
Reexamination Certificate
active
07663806
ABSTRACT:
A projection lens includes, in order form a magnification side: a first lens group having negative refractive power; and a second lens group having positive refractive power. An aspheric lens is arranged on the most magnification side of the first lens group. The conditional expressions 3<Bf/f and 0.4<H/L are satisfied, where f denotes a focal length of the projection lens, Bf denotes an air-converted back focal length, H denotes a height of a principal ray at the maximum angle of view on a plane which is orthogonal to an optical axis and which passes through point A, and L denotes a length from the point A to a vertex of a lens surface on the most reduction side on the optical axis. Here, the point A is a vertex of a lens surface on the most magnification side on the optical axis.
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Birch & Stewart Kolasch & Birch, LLP
Fujinon Corporation
Sugarman Scott J
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