Automatic focusing device using a plurality of different frequency components extracted at the same point
US5739858A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1994 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Sep 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/365
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is an automatic focusing device including a plurality of extraction means for extracting different frequency components from among image pickup signals outputted by image pickup means, driving direction decision means for deciding the driving direction of a focusing lens based on the signal extracted by the extraction means, detection means for detecting a focusing signal in correspondence with the degree of focusing by dividing a signal at the same point which is extracted by the extraction means, driving speed decision means for deciding the driving speed of the focusing lens based on the detection means, and driving means for driving the focusing lens of optical system to the focusing point based on the driving direction decision means and the driving speed decision means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.