Position detection device having absolute position detection apparatus and interpolation apparatus
US5142226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1989 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Sep 1, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24404
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An absolute position detector samples and outputs a digital value of absolute position data of an object of detection at each predetermined sampling timing. An interpolation circuit interpolates between position data of different sampling timings provided by the absolute position detector, thereby to produce absolute position data at close intervals. Such arrangement produces absolute position data with a time resolution which is finer than the period of the sampling timing. A further circuit produces an incremental pulse train on the basis of the output of the interpolation circuit in correspondence to change in a value of interpolation for each interpolation step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.