Automatic focus adjusting device
US4974002A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Feb 22, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focus adjusting device which takes into account a change in the position of the image plane of an object caused by movement of the object during the focus adjusting operation time and makes a lens in focus to the moving object. The position of the image plane of the object after the focus adjusting operation time is foreseeing-calculated with the result of a past focus adjusting operation as a factor, and the current focus adjusting operation time is foreseen in conformity with the foreseeing-calculated value, and the position of the image plane of the object is again foreseeing-calculated with the foreseen time as a factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.