Arrangement for and method of projecting an image with safety circuitry
US7665852B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2006 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Dec 30, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3173
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Red, blue and green lasers respectively emit a plurality of red, blue and green laser beams having respective output powers. The beams are optically focused and collinearly arranged to form a composite beam which is swept by a pair of scan mirrors in a pattern of scan lines on a projection surface, each scan line having a number of pixels. A controller causes selected pixels to be illuminated, and rendered visible, by the composite beam to produce an image. A safety circuit detects a malfunction of at least one of the lasers and the scan mirrors, and deenergizes the at least one of the lasers and the scan mirrors upon detection of the malfunction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.