Projection optical system
US7503661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2005 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Apr 7, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a projection optical system for obliquely performing enlargement projection of an image formed on a display device surface onto a screen surface, a plurality of reflective surfaces are provided, at least one of which is a curved reflective surface having an optical power. Letting the curved reflective surface, out of said at least one curved reflective surface, having the largest effective optical region be the largest curved reflective surface, the reflective surface other than the largest curved reflective surface is slightly decentered with the largest curved reflective surface kept in a fixed state so as to perform pixel shift on the screen surface in a vertical direction, or a horizontal direction, or an oblique direction, or vertical and horizontal directions within the range of a pixel pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.