Encoder having a pattern track including different-width patterns
US8658965B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2011 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Feb 1, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/3473
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An encoder which measures displacement of a moving part includes a light-emitting unit; a moving part which moves relative to the light-emitting unit; a first pattern track which includes a plurality of first unit patterns sequentially formed on the moving part, separated from one another and having different widths; a first light-receiving unit which is disposed to correspond to the light-emitting unit and detects first information light received from the light-emitting unit via a first pattern of the first unit patterns; at least one second light-receiving unit which is disposed to correspond to the light-emitting unit and detects second information about light received from the light-emitting unit via at least one second pattern of the first unit patterns; and a displacement calculating unit which calculates a relative displacement of the moving part with respect to a reference position based on the first and second information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.