Electronic blackboard apparatus
US4711977A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1987 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Jan 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0488
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electronic blackboard apparatus comprises an electronic blackboard unit, a writing instrument, a position-detecting control unit, and an output section. When video information such as characters and figures is depicted on a writing surface by means of the writing instrument, a magnetic bias with a locus corresponding to the video information is simultaneously applied to a position-detecting tablet of the electronic blackboard unit. Position coordinates thereof are computed by the position-detecting control unit and converted into electric signals. Similarly, when the video information on the writing surface is erased by means of the eraser, a magnetic bias with a locus corresponding to the erased video informaton is simultaneously applied to the position-detecting tablet. Position coordinates thereof are calculated by the position-detecting control unit and converted into electric signals. On the basis of these electric signals, the video information on the writing surface is output from the output section as a hard-copy image or as a display image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.