Position/displacement measuring system
US8274274B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2010 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Apr 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2457
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position/displacement measuring system is provided comprising at least one magnetically encoded scale body with at least one encoding track and a sensor device with at least one sensor sensitive to the encoding, the at least one encoding track comprising main fields of at least a first type and a second type which are arranged in a periodically alternating manner in at least a first direction, the subfields of the first type and second type being north pole fields and south pole fields, wherein the main fields of the first type and the main fields of the second type are each subdivided into subfields of at least two different types; wherein a length and/or an encoding strength of the subfields within a main field varies in at least the first direction; and wherein, in the main fields of the first type, the total length in the first direction and/or the total surface of field portions of the first type is greater than the total length and/or the total surface of field portions which are not of the first type, and in the main fields of the second type, the total length in the first direction and/or the total surface of field portions of the second type is greater than the total len…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.