Pen input device
US5444193A · kind A · utility
4Cited by
5References
11Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 20, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Sep 20, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0317
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pen input device is provided with a tablet having a top surface and a plurality of reference lines provided at a constant pitch on the top surface in mutually perpendicular directions, and a pointing device having a tip end, a first device for irradiating light on the tablet via the tip end, and a second device for detecting a moving direction and a moving quantity of the tip end of the pointing device on the tablet and a distance between the tip end of the pointing device and the top surface of the tablet based on scattered light received from the tablet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.