Optical positioning system for at least one picture element
US5387995A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1992 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | May 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/192
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical positioning system for at least two picture elements, a wavelength-dispersive, first light-deflecting element is used which deflects light beams in a first deflection direction according to their wavelength. In order to enhance the positioning speed, the optical system comprises two narrow-band light sources with a controllable wavelength for every picture element. The first light-deflecting element is arranged in the beam path of a second light-deflecting element with which an additional, essentially wavelength-independent deflection can be implemented. The range of deflection of the first light-deflecting element is thereby noticeably smaller than that of the second light-deflecting element. The ray beams of the light sources charge or impinge upon the wavelength-dispersive element in common. By setting the wavelength of each light source, each of the picture elements simultaneously receives a desired image position in the range of deflection of the second light-deflecting element around the basic position prescribed by it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.