System for detecting an absolute position
US4572951A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1982 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Dec 17, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A plurality of detectors, i.e., encoders, are prepared each of which generates an output signal representing an absolute value below one period at a predetermined period with respect to a given rotational or linear displacement. A displacement associated with a rotational or linear displacement of an object of detection is provided to each detector and one period of each detector is established in such a manner that one such period corresponds to one of mutually different predetermined amounts of displacement of the object. As a result, the output signal of each detector changes at a rate which is different from one another with respect to the displacement of the object and a combination of values of the output signals of the respective detectors is sufficient to identify an absolute position of the object. Accordingly, the number of periods from an origin with respect to a predetermined detector is determined employing the present output signals of the respective detectors as a parameter and the absolute position is specified by a combination of an integer section of this number of periods and a value below one period represented by the output signal of this predetermined detector…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.