Color corrected projection lenses for use with curved faceplate cathode ray tubes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 15, 2000
Grant Date -
N/A
app pub date -
Jan 12, 1998
filing date -
Jan 13, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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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