Autofocus system and method
US10794689B2 · kind B2 · utility
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2References
20Claims
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Key dates
| Filing date | Dec 6, 2018 |
| Grant date | Oct 6, 2020 |
| Priority date | — |
| Expiry date | Dec 6, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/70641
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
New and useful concepts for an autofocus system and method are provided. A basic concept uses fringe projection in an autofocus system and method. A further aspect provides spatial filtering concepts for the fringe projection concept. In yet another aspect, the fringe projection autofocus system and method is provided with temporal phase shifting using no moving parts. In a still further aspect, the fringe projection autofocus system and method is provided with unambiguous height measurement concepts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.