Optical: systems and elements – Lens – With field curvature shaping
Patent
1998-01-12
2000-02-15
Sugarman, Scott J.
Optical: systems and elements
Lens
With field curvature shaping
359708, 359713, G02B 1318, G02B 964
Patent
active
060259590
ABSTRACT:
A projection television system (10) is provided which has a CRT (16) with a curved faceplate and a projection lens system (13) for forming an image on a screen (14). The projection lens system (13) is characterized by a power lens unit (U2) which (a) provides color correction for the lens system and (b) has two positive lens elements and a negative lens element with one of said positive lens elements (L.sub.P) being at the image side of the unit. The positive lens element (L.sub.P) at the image side of the second lens unit (U2) is preferably the strongest positive lens element in the lens system, having a focal length (f.sub.P) which is less than 1.5 times the focal length of the system (f.sub.0).
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patent: 5329363 (1994-07-01), Moskovich
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patent: 5455713 (1995-10-01), Kreitzer
Klee Maurice M.
Sugarman Scott J.
U.S. Precision Lens Inc.
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