Optical positioning device using telecentric imaging
US7773070B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2005 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Sep 14, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0354
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
One embodiment relates to an optical displacement sensor for sensing movement of a data input device across a surface by determining displacement of optical features in a succession of frames. The sensor includes at least an illuminator, telecentric imaging optics on the object (scattering surface) side, and an array of photosensitive elements. The illuminator is configured to illuminate a portion of the surface. The telecentric imaging optics is configured to image the optical features emanating from the illuminated portion of the surface, and the array of photosensitive elements is configured to detect intensity data relating to the optical features imaged by the telecentric imaging optics. Other embodiments are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.