| US 7,567,385 B2 | ||
| Head-up display device with curved optical surface having total reflection | ||
| Shoichi Yamazaki, Yokohama (Japan); and Takeshi Nishimura, Yokohama (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jun. 21, 2007, as Appl. No. 11/766,294. | ||
| Application 11/766294 is a division of application No. 08/959285, filed on Oct. 24, 1997, granted, now 7,262,919. | ||
| Application 08/959285 is a continuation of application No. 08/478688, filed on Jun. 07, 1995, abandoned. | ||
| Claims priority of application No. 6-130301 (JP), filed on Jun. 13, 1994; application No. 6-204268 (JP), filed on Aug. 05, 1994; and application No. 6-336063 (JP), filed on Dec. 22, 1994. | ||
| Prior Publication US 2007/0247730 A1, Oct. 25, 2007 | ||
| Int. Cl. G02B 27/14 (2006.01) | ||
| U.S. Cl. 359—631 [359/633] | 6 Claims |
| 1. A display device comprising:
display means for forming image information on a plane; and
optical means for guiding light from said display means to an eye, said optical means including a first curved surface without
planar portions for totally reflecting the light and a second curved surface for reflecting light which is totally reflected
by said first curved surface,
wherein the light, in an optical path from said display means to the eye, is totally reflected by said first curved surface
and is transmitted by said first curved surface, and
wherein optical power of said first curved surface varies in accordance with an azimuthal angle and optical power of said
second curved surface varies in accordance with an azimuthal angle.
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