High resolution absolute encoder for position measurement
US5243187A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1990 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Jun 28, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/772
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An encoder comprises a rotatable or longitudinally displaceable body having a plurality of sawtooth-shaped regions which lie one behind the other in the direction of rotation or displacement. Each sawtooth-shaped region is separated by a steep edge that extends transversely to the direction of rotation or displacement. Upon movement of the body due to its sawtooth-shaped configuration, the distance of the surface of the sawtooth-shaped regions changes relative to a distance sensor arrangement. An evaluation circuit receives the output signals of the sensor arrangement and determines the rotation angle or the displacement of the body. The sensor arrangement comprises two distance sensors being offset relative to one another in the direction of movement by less than one sawtooth-shaped region forming distance signals, with the distance signals input to the evaluation circuit. The evaluation circuit evaluates only one of the distance signals in order to determine the angle or displacement of the body. The entire surface of the rotationally or longitudinally displaceable body facing the distance sensors has coinciding sawtooth-shaped regions. A rough measuring system is provided whose …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.