Coordinate detecting device, writing instrument, and coordinate inputting system
US7982141B2 · kind B2 · utility
5Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2007 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Jun 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0433
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pen includes a first speaker that outputs a first signal and a second speaker that outputs a second signal. The first and second speakers are located away from a tip of the pen at respectively different locations. The second signal is delayed with respect to the first signal by a time shorter than a cycle of the first signal. An interpolation time is set between the times of generation of the first and second signals. Interpolated positions of the first and second speakers at the interpolation time are estimated, and position of the tip of the pen is calculated from the interpolated positions of the first and second speakers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.