Digital sensor of relative position
US6400143B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a digital sensor of relative position, which has a circular multipolar magnetic ring which is mobile in rotation opposite a stationary magnetic sensor comprised of at least two sensitive elements, respectively positioned facing a main track and a “revolution tick” reference track, and a device for processing of the output signals, such that on the magnetic ring, a magnetic pattern is produced from a pair of north and south poles whose transition is different from the transition between the other north and south poles of the magnetic ring, and of which the angular width of the north pole is different at the site of the “revolution tick” reference track. The sensitive elements can be three in number, the first of which faces reference track and of which the other two face the main track, or they can be produced in the form of two parallel bars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.