Position detection apparatus, apparatus including the same and position detection method
US10113888B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2016 |
| Grant date | Oct 30, 2018 |
| Priority date | — |
| Expiry date | Dec 24, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24476
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The position detection apparatus includes the first optical position detector used with an optical scale having periodic patterns. The first position detector receives lights from the periodic patterns when moving relatively to the optical scale with a movement of a movable member to generate first detection signals respectively changing at periods corresponding to periods of the periodic patterns. The second non-optical position detector generates a second detection signal changing with the movement of the movable member. The calculator produces a first position signal by using the first detection signals, produces a second position signal whose resolution is different from that of the first position signal, by using the second detection signal, and performs a calculation for combining the first and second position signals together to produce an absolute position signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.