Dual sensor encoder to counter eccentricity errors
US6215119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Jan 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/244
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low-cost, high precision encoder system includes a codewheel and two encoder sensors mounted at opposite sides of the codewheel to form a dual sensor system having a corrected output that corrects for eccentricity in the mounting of the codewheel and the sensors. The encoder system has a correction circuit that provides a corrected output based on inputs received from the two encoder sensors, which can be single or multiple channel encoders. Methods for achieving the corrected output signal include measuring a time between a signal from the first encoder and a signal from the second encoder and halving this time. Methods for identifying a leading signal from the two sensors are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.