| US 7,393,107 B2 | ||
| Rear-type projector | ||
| Masatoshi Yonekubo, Hara-mura (Japan); Daisuke Uchikawa, Chino (Japan); Shunji Kamijima, Hara-mura (Japan); and Takashi Takeda, Suwa (Japan) | ||
| Assigned to Seiko Epson Corporation, Tokyo (Japan) | ||
| Filed on Apr. 05, 2004, as Appl. No. 10/816,935. | ||
| Claims priority of application No. 2003-102870 (JP), filed on Apr. 07, 2003; and application No. 2003-137527 (JP), filed on May 15, 2003. | ||
| Prior Publication US 2005/0007562 A1, Jan. 13, 2005 | ||
| Int. Cl. G03B 21/26 (2006.01); G03B 21/22 (2006.01); G03B 21/28 (2006.01); H04N 5/65 (2006.01) | ||
| U.S. Cl. 353—29 [353/78; 353/85; 353/94; 348/818] | 6 Claims |
| 1. A rear-type projector comprising:
a laser beam source that outputs a laser beam that is modulated based on an image signal from an opening:
a scanning unit that scans the laser beam within a predetermined surface;
a screen to which the laser beam is projected from a backside of the screen;
a light source unit for screen monitoring that is disposed outside the opening and that emits invisible light for monitoring
the screen;
a screen monitoring unit that receives the invisible light reflected from the screen;
a control unit that controls the laser beam source so as to stop output of only the laser beam based on an output of the screen
monitoring unit; and
a housing that covers an optical path from the laser beam source to the backside of the screen.
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