Polarizing beam splitter
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United States of America Patent
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Apr 13, 2004
Grant Date -
Oct 2, 2003
app pub date -
Nov 15, 2002
filing date -
Oct 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical imaging system including a wide-angle Cartesian polarizing beam splitter, light valve illumination optics having an f/#.ltoreq.2.5, and at least one reflective light valve. The Cartesian polarizing beam splitter (PBS) has a structural orientation defining fixed polarization axes. The use of a Cartesian PBS allows the development of systems using curved PBS that provide higher light output and/or replace or augment other optical components. By recognizing and advantageously applying properties of wide-angle Cartesian polarizers, the present invention discloses a high-efficiency optical imaging system capable of functioning at f/#'s equal to or below f/2.5 while maintaining a contrast ratio of at least 100 to 1, or, more preferably, 150 to 1 in a projection system configuration.
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