Optical displacement detection apparatus
US8610050B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2012 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | May 20, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/776
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical displacement detection apparatus includes a scale and a sensor head. The scale has a first and second pattern. The head includes a first photodetector that detects a beam through the first pattern and generates a first signal, and a second photodetector that detects the beam through the second pattern and generates a second signal. The first and second signals include a first component, and a second component that corresponds to an absolute displacement of the scale. The first pattern, the second pattern, the first photodetector, the second photodetector, and a beam source are disposed such that the detection of the first photodetector and the detection of the second photodetector are performed correlatively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.