Focus detecting system using multiple portions of the image to be focussed
US4857720A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focus detecting system which comprises photoelectric transducer element arrays for sensing standard and reference light fluxes which have passed respectively through different areas of an exit pupil of a photo-taking lens. The photoelectric transducer element arrays are comprised of a plurality of photoelectric transducer element arrays different in at least position or direction, some of the photoelectric transducer element arrays being arranged at a position containing the optical axis of the photo-taking lens whereas the remaining photoelectric transducer element arrays are arranged at a position which does not contain the optical axis. The direction of the photoelectric transducer element arrays is substantially perpendicular to the imaginary line which is drawn to connect between the optical axis and the position at which the photoelectric transducer element arrays outside the optical axis are arranged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.