Length measuring device
US4400890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Oct 26, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A length measuring device has a magnetic scale body including at least one origin signal magnetic section and a measurement signal magnetic section forming a magnetic grating, the magnetic scale body having a uniform frictional surface formed over the entire effective length of the scale body, and a detecting head body including an origin detecting head for detecting an origin signal and a measurement detecting head for detecting a measurement signal and provided with a scraper in elastic contact with the frictional surface of the magnetic scale body, the detecting head body moving relative to the magnetic scale of the body along the length of the latter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.