Displacement sensor and displacement detection method
US9772198B2 · kind B2 · utility
1Cited by
1References
9Claims
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Key dates
| Filing date | Dec 18, 2013 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | May 21, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R25/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a linear displacement sensor, two magnets with different polarities define one pitch of a magnetic scale. kn (k is a natural number greater than or equal to 2, n is a natural number greater than or equal to 1) sensor units configured to output a plurality of signals whose period is one pitch and whose phases with respect to the pitch are different are arranged along the magnetic scale in a one-pitch segment. Periodic errors with n periods per pitch of the sensor units are canceled out by averaging the phases from the kn sensor units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.