Differential displacement optical sensor
US6020967A · kind A · utility
9Cited by
5References
11Claims
0Family size
Inventors
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34776
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Positional sensors receive light that has been reflected off a pair of complementary geometric patterns carried by a supporting, displaceable carrier surface. The sensors view the patterns through viewing windows as the carrier surface is displaced laterally, presenting differing portions of the patterns to the sensors. The patterns are shaped to produce outputs which, when their difference value is extracted, provide output signals that are a measure of the displacement of the carrier surface and in which common mode errors are minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.