Position-measuring device having four scanning units and two measuring graduations
US11940304B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2021 |
| Grant date | Mar 26, 2024 |
| Priority date | — |
| Expiry date | Sep 30, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/90
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position-measuring device includes a scale having first and second measuring graduations, which each include graduation structures that respectively extend parallel to first and second directions. A first scanning unit is associated with the first measuring graduation, and second and third scanning units are associated with the second measuring graduation. A fourth scanning unit is associated with the first or second measuring graduation. In the former case, a first straight connecting line running through scanning locations of the first and fourth scanning units and a second straight connecting line running through scanning locations of the second and third scanning units are parallel or form a predetermined angle therebetween that is not equal to a sum of the angles of the first and second directions. In the latter case, the scanning locations of the second, third and fourth scanning units do not lie on a common straight connecting line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.