Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2007-10-30
2007-10-30
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
Reexamination Certificate
active
11582316
ABSTRACT:
A projection lens is provided and includes: in order from the object, a first lens group having a negative refractive power and including an aspheric lens and a double-concave lens in this order from the magnification side; a second lens group having a positive refractive power and including one positive lens or one positive lens and one negative lens; and a third lens group having a positive refractive power, including three to five lenses including a cemented lens portion and a positive lens portion in this order from the magnification side, and including a surface closest to the magnification side as an aspheric surface. The projection lens has a substantially telecentricity on the reduction side, the third lens group has a magnification-side focal position located between the third and second lens groups, the projection lens has the longest air space between the first and second lens groups, and the projection lens satisfies specific conditions.
REFERENCES:
patent: 3244606 (2001-10-01), None
patent: 2002-131636 (2002-05-01), None
patent: 2003-156683 (2003-05-01), None
patent: 2003-287676 (2003-10-01), None
patent: 2004-354405 (2004-12-01), None
Fujinon Corporation
Sugarman Scott J.
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