Wide angle lens system having a distorted intermediate image
US7009765B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 16, 2002 |
| Grant date | Mar 7, 2006 |
| Priority date | — |
| Expiry date | Aug 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The wide angle lens system described herein allows projection devices (e.g., rear projection display devices) to be more compact than would otherwise be possible. The lens system includes a wide angle lens stage and a relay lens stage. When operating as a projection device, the relay lens stage projects a distorted intermediate image to the wide angle lens stage, which projects the image for display. The distortion cause by the relay lens stage compensates (i.e., is approximately equal and opposite) for the distortion caused by the wide angle stage. The distortion can be the image shape and/or the focal plane. When operating as a taking device, the wide angle stage provides a distorted image to the relay lens stage, which compensates for the distortion and provide a less distorted, or even non-distorted image, for capture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.