Automatic focusing device capable of detecting panning
US5798793A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/959
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic focusing device includes an image pickup device for outputting an image signal by performing photoelectric conversion of an image of an object, a band-pass filter for extracting a sharpness signal corresponding to the sharpness from among the image signal, a diaphragm for controlling the amount of light incident upon the image pickup device, and a control circuit for controlling prohibition of the drive of a focusing lens based on a change in the sharpness signal output from the band-pass filter and a change in the state of the diaphragm. It is thereby possible to exactly detect an operation, such as panning or the like, and to prevent the stop of the focusing lens at a defocused position caused by an erroneous operation by prohibiting the drive of the focusing lens when panning has been detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.