Method and apparatus for detecting focus of moving images with tilted plane detector and time delay means
US5432331A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1994 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Jun 7, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focus detecting system is provided for detecting the focus condition of a moving image in an optical system. The focus detecting system includes means for detecting the sharpness of a plurality of sub-images formed along a plurality of sight lines by the optical system, the detecting means including a plurality of detectors arranged in a plane tilted with respect to an optical axis of said optical system and the detectors aligned with a direction of motion of the image formed by the optical system such that the sub-images are detected at a plurality of positions in the vicinity of best focus of the optical system. A time delay is provided between the sub-images such that the sub images represent the same portion of a scene being imaged by the optical system. A position of best focus for said optical system is calculated from the sub-image data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.