| US 7,572,015 B2 | ||
| Displaying optical system and image projection apparatus | ||
| Shuichi Kobayashi, Yokohama (Japan); Keiichiro Ishihara, Kanagawa-ken (Japan); and Ryuichi Sakaguchi, Machida (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, (Japan) | ||
| Filed on Aug. 15, 2005, as Appl. No. 11/204,487. | ||
| Claims priority of application No. 2004-236839 (JP), filed on Aug. 16, 2004. | ||
| Prior Publication US 2006/0033009 A1, Feb. 16, 2006 | ||
| Int. Cl. G03B 21/20 (2006.01); G03B 21/28 (2006.01); H04N 3/02 (2006.01); H04N 3/08 (2006.01); G02B 26/10 (2006.01) | ||
| U.S. Cl. 353—102 [353/98; 348/195; 359/212.1; 359/223.1] | 21 Claims |
| 1. A displaying optical system comprising:
a light source which emits a modulated coherent light;
a scanning device which scans the light from the light source;
a first optical system which causes the light from the scanning device to form an intermediate image;
a second optical system which causes the light from the intermediate image to form an image on a real display surface; and
an optical element arranged in between the first and second optical systems configured to widen the divergence angle of the
light emerged from the first optical system so that the divergence angle of the light emerged from the optical element toward
the second optical system is wider than the incident angle of the light on the optical element incident from the first optical
systems,
wherein the second optical system establishes a conjugate relationship between the optical element and the display surface,
and the optical element is movable in a plane where the intermediate image exists.
|