Electromagnetic position transducer
US5120908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Nov 1, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/047
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is electromagnetic transducer that does not require complex analog to digital, digital to analog converters, microprocessors or large memory circuitry. The transducer has a helical transmitter coil with tap nodes spaced between its end extremities. An oscillator drives the coil for simultaneously producing oppositely directed current on opposite sides of selected taps, creating a moving fringing field that is compatible with modern graphic display tablet technology. A control circuit of the transducer has a closed-loop integrator for detecting the centroid of a received stylus signal. Analog and digital versions of the integrator are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.