Focusable, color corrected, high performance projection lens systems
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United States of America Patent
Stats
-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Aug 20, 1998
filing date -
Aug 22, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Focusable, color corrected, high performance projection lens systems are provided which include three lens units (U1, U2, U3), the first lens unit being composed of two subunits (U.sub.S1, U.sub.S2). The lens systems can have f/190 's less than 1.0, total fields of as much as 90.degree., low vignetting losses, and MTF values greater than 0.5 at 10 cycles/mm through 0.85 of the full field. By varying the space between the first and second lens units, these performance levels can be maintained as the lens system is focused over a range of conjugates of approximately .+-.7.5% from a center value of about 4 meters. The lens systems can be used in such demanding applications as flight simulators.
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Cited Art Landscape
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