| US 7,468,843 B2 | ||
| Optical system and display apparatus | ||
| Yasushi Tanijiri, Osakasayama (Japan); Hiroaki Ueda, Suita (Japan); Ichiro Kasai, Toyonaka (Japan); and Takao Kobayashi, Takatsuki (Japan) | ||
| Assigned to Minolta Co., Ltd., Osaka (Japan) | ||
| Filed on Aug. 17, 2006, as Appl. No. 11/505,771. | ||
| Application 11/505771 is a division of application No. 10/464268, filed on Jun. 18, 2003, granted, now 7,136,228, filed on Nov. 14, 2006. | ||
| Claims priority of application No. 2002-279806 (JP), filed on Sep. 25, 2002; and application No. 2003-72110 (JP), filed on Mar. 17, 2003. | ||
| Prior Publication US 2006/0274440 A1, Dec. 07, 2006 | ||
| Int. Cl. G02B 27/14 (2006.01); G09G 5/00 (2006.01) | ||
| U.S. Cl. 359—631 [345/7] | 15 Claims |
| 1. A display apparatus comprising:
a light source which emits bundles of rays of different wavelengths;
an image forming device which forms a color image by a field sequential driving method in which while the image forming device
is illuminated with the bundles of rays sequentially, the bundles of rays are modulated in accordance with the respective
wavelengths in each pixel of the image forming device; and
a magnifying optical system, being composed of one concave reflective surface, which directs light of the image formed by
the image forming device to an observer's pupil by reflecting the light on the concave reflective surface which performs surface
reflection,
wherein the concave reflective surface is an axially asymmetric aspherical surface.
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