| 摘要 |
<p>An optical imaging system including a wide-angle Cartesian polarizing beam splitter, light valve illumination optics having an f/# </= 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 1200 to 1, or, more preferably, 150 to 1 in a projection system configuration.</p> |
| 申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
BRUZZONE, CHARLES, L.;AASTUEN, DAVID, J., W.;STRHARSKY, ROGER, J.;ECKHARDT, STEPHEN, K.;WEBER, MICHAEL, F.;BOYD, GARY, T. |
