Method and apparatus for determining focus direction and amount
US4333007A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Jul 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/36
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for determining the range to an object utilizing a plurality of radiation responsive detectors arranged in groupings wherein a first grouping of detectors receives radiation from the object in a first pattern and the second grouping of detectors receives radiation from the object in a second pattern. The patterns move with respect to one another as the distance between the object and the system changes. The range is determined from a determination of the relative position of the patterns by computing where the patterns will coincide if the focusing lens of the system is moved. The output is a signal having a characteristic indicative of the desired direction of motion of the lens and a characteristic indicative of the amount of such motion necessary to produce a proper focus condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.