Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2007-02-06
2007-02-06
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S676000
Reexamination Certificate
active
10561073
ABSTRACT:
The present invention provides a zoom lens that suppresses the generation of unnecessary light and is suitable for a projection lens. The zoom lens is used as a projection lens of a projector in which a prism is located between the projection lens and a spatial optical modulating element B. A lens closest to the spatial optical modulating element B is a meniscus positive lens whose convex surface faces a screen. A refractive index of the meniscus positive lens is 1.75 or more.
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Kimura Syunsuke
Takahashi Masayuki
Hamre Schumann Mueller & Larson P.C.
Hasan M.
Matsushita Electric - Industrial Co., Ltd.
Sugarman Scott J.
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