Optical illumination and distortion compensator
US4234891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1979 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Jul 30, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0118
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This disclosure describes a method and apparatus for a visual display system in a vehicle simulator to compensate for distortion and to maximize illumination in a projected image substantially at the same time. Where a spherical mirror is interposed between a curved rear-projection screen and a viewing position, certain distortions are developed which detract from realism. Such distortions are compensated for by reflecting the image off a curve folding mirror positioned so that its major axis is substantially perpendicular to the major axis of the curved rear-projection screen. In accordance with the invention, when such compensation is achieved, the illumination of the projected image will be at substantially its brightest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.