Code-based, electromagnetic-field-responsive graphic data-acquisition system
US5248856A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1992 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Oct 7, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electromagnetic-field-responsive (preferably optical), code-based, graphic data-acquisition system for tracking the operational status of a mobile write-effective component (stylus, eraser, etc.) in relation to a defined writing-surface area. The preferred embodiment features an active optical structure which is disposed adjacent the writing-surface area for creating, by scanning, a defined zone of optical radiation, optically reactive, retroreflective code structure which is joined to the mobile component and which is capable of reacting (reflecting the same) to radiation within the zone when the code structure intersects the zone, a reaction monitoring structure for monitoring the reaction behavior of the code structure and for producing a related response, and interpretation structure which acquires that response and determines therefrom the desired operational-status-tracking information. Modification to this preferred structure are also illustrated and discussed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.