Handwriting detection sheet and handwriting system
US8275222B2 · kind B2 · utility
2Cited by
12References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2007 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Jan 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0421
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A handwriting detection sheet includes a handwriting layer, a code layer and an optical layer. The handwriting layer can display handwriting. The code layer is placed on a rear-face side of the handwriting layer. The code layer includes plural code images arranged in a matrix manner. In the code images, position codes are encoded with a light absorption material that absorbs infrared light. The optical layer is placed on a rear-face side of the code layer. The optical layer reflects infrared light and allows visible light to pass through.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.