Athermal LCD projection lens
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United States of America Patent
Stats
-
Oct 5, 1999
Grant Date -
N/A
app pub date -
Jan 24, 1997
filing date -
Jan 31, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A four element, athermalized projection lens for use in forming an enlarged color image of a LCD panel is disclosed. The powers of the elements from the screen to the LCD are negative/positive/negative/positive and the dispersions are low dispersion/low dispersion/high dispersion/low dispersion. The first three elements are composed of plastic and the last element is composed of glass. The projection lens exhibits a high level of aberration correction over magnifications ranging from about 5.times. to about 12.times.. The four element design comprises the minimum number of elements capable of achieving a relatively long back focal length, athermalization, and lateral color correction of less than about half a pixel.
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Cited Art Landscape
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