Optical device for measuring the position of an object
US10209505B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 15, 2018 |
| Grant date | Feb 19, 2019 |
| Priority date | — |
| Expiry date | Feb 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/56
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to an optical device for measuring the position of an object along a first axis, the object being subjected to light radiations emitted by a light source. The optical device comprises: an imaging system comprising an objective for collecting light radiations diffused by the object, the imaging system having an optical axis extending parallel to the first axis; a transmission mask having at least a first aperture and a second aperture, the first aperture and second aperture being spaced from each other along a second axis, perpendicular to the first axis, the transmission mask being arranged so as to let a first part of the radiations and a second part of the radiations which are diffused by the object pass through the first aperture and the second aperture respectively, while blocking a part of the radiations emitted by the light source which is not diffused by the object; and a detector adapted for generating an image including a first spot and a second spot representative of the first part and second part of the radiations impacting the detector plane, wherein variation of the position of the object relative to the object plane of the imaging system along th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.