Displacement transducer which simultaneously extracts signals via sequential switching
US4680466A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1985 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Apr 19, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/366
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A displacement transducer comprising a code disk on which a plurality of light permeable slits arranged with a fixed pitch are formed, a light source which emits light to the code disk, and an image sensor which receives the light from the light source through the light permeable slits. High resolution and fast response performance are realized by measuring a displacement of the code disk from the amount of the phase shift of a fundamental wave component contained in the output obtained from the image sensor. There is a further advantage of suppressing zero point return operation to a minimum as well as improving linearity of an image sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.