Automatic focusing device
US5787314A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Nov 21, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focusing device includes a focus detection device for detecting focus data from a plurality of focus detection areas established in the imaging region. A selection device selects a specified area from the plurality of focus detection areas. A focus control device performs focus control of the photographic lens corresponding to the focus data of that specified area. The selection device may include a statistical prediction device for performing a statistical calculation on the past focus data in the specified area and for determining a predicted value of the focus data by extending a trend of the focus data. A statistical determination device determines whether the most recent focus data of the specified area is outside the acceptable range of the predicted value. A statistical tracking device searches for focus data within the acceptable range of the said prediction value and changes the specified area to the searched-out area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.