| US 7,542,206 B2 | ||
| Light collectors for projection systems | ||
| Miller H. Schuck, Boulder, Colo. (US); and Michael G. Robinson, Boulder, Colo. (US) | ||
| Assigned to Real D, Beverly Hills, Calif. (US) | ||
| Filed on Jul. 18, 2007, as Appl. No. 11/779,711. | ||
| Claims priority of provisional application 60/807704, filed on Jul. 18, 2006. | ||
| Claims priority of provisional application 60/829495, filed on Oct. 13, 2006. | ||
| Claims priority of provisional application 60/862414, filed on Oct. 20, 2006. | ||
| Prior Publication US 2008/0018999 A1, Jan. 24, 2008 | ||
| Int. Cl. G02B 5/30 (2006.01); G02B 6/00 (2006.01); G02B 27/28 (2006.01) | ||
| U.S. Cl. 359—495 [359/496; 359/497; 359/502; 362/19; 362/551; 362/583; 353/20; 385/36] | 19 Claims |
| 1. An apparatus for a projection system, comprising:
a first lightpipe operable to receive light from a first light source;
a second lightpipe operable to receive light from a second light source;
a first polarization beam splitter having a first input port, a first polarization manipulating port, and a first output port,
wherein the first input port is optically coupled to the first lightpipe;
a second polarization beam splitter having a second input port, a second polarization manipulating port, and a second output
port, wherein the second input port is optically coupled to the second lightpipe;
a quarter-wave plate adjacent the first and second polarization manipulating ports;
a reflecting element adjacent the quarter-wave plate; and
an output light pipe operable to collect light from the first and second output ports.
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