Color corrected projection lenses employing diffractive optical surfaces
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United States of America Patent
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Mar 4, 2003
Grant Date -
N/A
app pub date -
May 11, 2001
filing date -
Nov 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A projection television system (10) is provided which has a CRT (16) and a projection lens system (13) for forming an image on a screen (14). The projection lens system (13) is characterized by a diffractive optical surface (DOS) which provides color correction for the lens system. The diffractive optical surface (DOS) can be formed as part of a diffractive optical element (DOE) or as part of an existing lens element of the lens system. The diffractive optical surface (DOS) is located between the object side (S2) of the lens' first lens unit (U1) and the image side (S11) of the lens' third lens unit (U3). The distance between the diffractive optical surface (DOS) and the lens' aperture stop (AS) is less than 0.1.multidot.f.sub.0, where f.sub.0 is the focal length of the projection lens (13).
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