Apparatus having an encoder with an origin detection pattern
US10048095B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 2016 |
| Grant date | Aug 14, 2018 |
| Priority date | — |
| Expiry date | Oct 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34776
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An origin detector includes detecting element groups having a first to a fourth detector, is configured so that a first signal sensitivity of the detectors of a center is larger than a second signal sensitivity of the detectors of a periphery, reads an origin detecting pattern including an origin pattern having a length along a detecting direction of a part having a physical characteristic different from an origin peripheral part larger than a length along the detecting direction of each detecting element group, and outputs a first signal using the first and third detectors, and a second signal using the second and fourth detectors. A processor acquires a third signal from the first signal and a first threshold, and a fourth signal from the second signal and a second threshold, and outputs a fifth signal using the third and fourth signals as an origin signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.