Claims
- 1. A rear projection optical system for being installed at a rear side of a screen of a rear projection apparatus, the rear projection system comprising:
a display panel; a illuminating optical system for illuminating the display panel, the illuminating optical system being decentered from a screen center in both of a horizontal direction and a vertical direction; and a projection optical system, decentered from the screen center in the vertical direction, for projecting a display image on the display panel projected by the illuminating optical system onto a screen through a rear mirror positioned at a position that is the center of the screen, wherein the projection optical system comprises a dioptric system, a deflection mirror, and a curved mirror in this order from the display panel to the rear mirror, and wherein the curved mirror is decentered from the screen center in the vertical direction but centered against the screen center in the horizontal direction.
- 2. A rear projection optical system as claimed in claim 1, wherein, when the rear projection apparatus is observed from one side thereof in the vertical direction, the illuminating optical system does not overlap with a light flux from the projection curved mirror to the rear mirror.
- 3. A rear projection optical system as claimed in claim 2, wherein, when the rear projection apparatus is observed from one side thereof in the vertical direction, the illuminating optical system at least partly overlaps with a light flux from the rear mirror to the screen.
- 4. A rear projection optical system as claimed in claim 3, wherein, when observed from the one end of the screen in the horizontal direction, the illuminating optical system at least partly overlaps with a light flux from the projection curved mirror to the rear mirror.
- 5. A rear projection optical system as claimed in claim 2, wherein, when observed from the one end of the screen in the horizontal direction, the illuminating optical system at least partly overlaps with a light flux from the projection curved mirror to the rear mirror.
- 6. A rear projection optical system as claimed in claim 1, wherein, when the rear projection apparatus is observed from one side thereof in the vertical direction, the illuminating optical system at least partly overlaps with a light flux from the rear mirror to the screen.
- 7. A rear projection optical system as claimed in claim 6, wherein, when observed from the one end of the screen in the horizontal direction, the illuminating optical system at least partly overlaps with a light flux from the projection curved mirror to the rear mirror.
- 8. A rear projection optical system as claimed in claim 1, wherein, when observed from the one end of the screen in the horizontal direction, the illuminating optical system at least partly overlaps with a light flux from the projection curved mirror to the rear mirror.
- 9. A rear projection optical system as claimed in claim 1, wherein the illuminating optical system comprises a plurality of optical elements including a light source, and wherein the light source is mostly decentered in the horizontal direction among the plurality of optical elements.
- 10. A rear projection optical system as claimed in claim 1, wherein the dioptric system is provided so that a optical axis thereof is parallel to the screen.
- 11. A rear projection optical system as claimed in claim 10, wherein the optical system of the dioptric system is kept horizontal.
- 12. A rear projection optical system as claimed in claim 1, wherein the optical system of the dioptric system is kept horizontal.
- 13. A rear projection optical system as claimed in claim 1, wherein the curved mirror has a negative optical power to enlarge a light flux of the display image.
- 14. A rear projection apparatus comprising:
a screen for displaying an image; and a rear projection optical system as claimed in claim 1.
- 15. A rear projection apparatus as claimed in claim 14, wherein, when the rear projection apparatus is observed from one side thereof in the vertical direction, the illuminating optical system does not overlap with a light flux from the projection curved mirror to the rear mirror.
- 16. A rear projection apparatus as claimed in claim 14, wherein, when the rear projection apparatus is observed from one side thereof in the vertical direction, the illuminating optical system at least partly overlaps with a light flux from the rear mirror to the screen.
- 17. A rear projection apparatus as claimed in claim 14, wherein, when observed from the one end of the screen in the horizontal direction, the illuminating optical system at least partly overlaps with a light flux from the projection curved mirror to the rear mirror.
- 18. A rear projection apparatus as claimed in claim 14, wherein the illuminating optical system comprises a plurality of optical element including a light source, and wherein the light source is mostly decentered in the horizontal direction among the plurality of optical elements.
- 19. A rear projection apparatus as claimed in claim 14, wherein the dioptric system is provided so that a optical axis thereof is parallel to the screen.
- 20. A rear projection apparatus as claimed in claim 14, wherein the optical system of the dioptric system is kept horizontal.
- 21. A rear projection apparatus as claimed in claim 14, wherein the curved mirror has a negative optical power to enlarge a light flux of the display image.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-213059 |
Jul 2001 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based on Japanese Patent Application No. 2001-213059 filed in Japan on Jul. 13, 2001, the entire content of which is hereby incorporated by reference.