Focus detector
US6072956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1999 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Jun 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focus detector used in an AF-SLR camera has a plurality of focusing sensors disposed not only in the center but also in a region distant from the center of the frame. A first focusing sensor group of the focusing sensors which are disposed in a first region where light flux passing through a pupil of a lens having an F-number larger than a predetermined F-number such as F2.8 is always used without reference to the F-number of the lens. A second focusing sensor group of focusing sensors which are disposed in a second region where light flux passing through a pupil of a lens having an F-number equal to or smaller than the predetermined F-number and having a higher accuracy for focus detection is used only when the F-number of the lens is equal to or smaller than the predetermined F-number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.