Encoder
US9534935B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 2015 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Jun 15, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/366
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An encoder includes a scale including an origin detecting pattern, an origin detector, and a processor. The origin detector includes a plurality of detecting element groups including a first, second, third, and fourth detectors. The first and second detectors and the third and fourth detectors are symmetrically arranged to a center of each detecting element group, respectively. A part of the origin detecting pattern having a physical characteristic different from an origin peripheral part is shorter than each detecting element group. The origin detector outputs a first signal from the first and third detectors, and a second signal from the second and fourth detectors. The processor outputs a fifth signal based on a third signal from the first signal and a first threshold, and a fourth signal from the second signal and a second threshold as an origin signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.