Wireless and passive tablet for inputting to computer
US7623120B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2003 |
| Grant date | Nov 24, 2009 |
| Priority date | — |
| Expiry date | Aug 8, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This invention refers to peripheral equipment of a computer and is a wireless and passive tablet for inputting to the computer that converts the track of handwriting to digital X, Y coordinates and then inputs it to the computer and then displays the track on screen of the computer. The characteristic of the wireless and passive tablet is using the coil of X, Y direction in transmitting and receiving. A square wave is generated and input to a transmitting circuit. A transmitted electromagnetic wave is inputted to a circuit of a pen to form resonance that will be outputted to a receiving circuit. The receiving circuit connects to an amplifying circuit to amplify the signal and input the amplified signal into a phase angle detecting circuit and an amplitude detecting circuit respectively to control the phase angle and amplitude. And then the signal is inputted to a primary CPU to realize the writing function of the wireless pen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.