Device and process for determining position between two parts which are movable relative to one another
US6438860B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Aug 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for determining position between two parts which are movable relative to one another, comprises a linear sensor arrangement, a length scale or angle scale comprising a sequence of transparent and non-transparent fields, an illumination device and elements for imaging at least one section of the scale on the sensor arrangement. The entire length scale or angle scale is divided into n graduation portions of equal length, wherein every portion contains a sequence of transparent and non-transparent marks, and the sequence is successively a number which is binary-coded with k bits and correlated with the respective portion as rough value code and a fixedly recurring number which is likewise binary-coded with k bits as a reference mark (reference mark with length of k bits). Every code bit is of equal length and is formed of a transparent and a non-transparent field (half-bit) of equal length, wherein the binary information comes from a sequence of two half-bits. A process for relative position determination shows how the sensing of the graduation and the evaluation and determination of the measurement values is carried out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.