Automatic focusing device
US4872058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1987 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Oct 8, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic focusing device which is arranged to perform a focusing action by detecting the peak value of a high frequency component of a video signal obtained from within a focus detecting area set on the image sensing plane of an image sensor and by driving a photo taking optical system in such a way as to increase the detected peak value comprises: a peak position detecting circuit which locates a position on the image sensing plane at which the peak value of the high frequency component of the video signal is detected; and a gate control circuit which changes the position of the focus detecting area in accordance with the detected peak position which is located by the peak position detecting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.