Focus detecting device for camera
US4473287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1982 |
| Grant date | Sep 25, 1984 |
| Priority date | — |
| Expiry date | Jun 16, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Focus detecting device comprises a focus detecting optical system for guiding the light from an object onto a focus detecting plane, focus detecting means for identifying the focusing state from the image of the object formed on the focus detecting plane, means for generating a signal corresponding to the controlled actual F-number of the photographic optical system, means for generating a correction signal corresponding to the displacement of the optimum image plane of the photographing optical system according to the change of the controlled F-number, and means for correcting the output signal of the focus detecting means according to the correction signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.