Optical detection device for determining the position of an indicator medium
US5789739A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to an optical detection device for determining the position of an indicator medium on or in front of a projection surface with an optical monitoring field arranged directly in front of or slightly spaced from the presentation surface parallel to the latter, wherein either at least one scanner is provided which transmits light beams in the plane of the monitoring field, which scans the monitoring field and delivers angle and distance measurements related to the respective position of the indicator medium in the monitoring field, or wherein, starting from two different positions, range and/or angle measurement devices are provided which transmit light beams in the plane of the monitoring field, and wherein the angular range scanned by each of the two range and/or angle distance measuring devices respectively embraces the whole monitoring field, and wherein the respective position of the indicator medium in the monitoring field can be computed from the range and angular values delivered by the range and/or angle measurement devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.