Image-taking apparatus and focus control method of image-taking apparatus with first and second control method in first zoom state and only second control method in second zoom state
US7589768B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Jul 10, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image-taking apparatus is disclosed which can achieve an appropriate AF control regardless of a zoom magnification. The image-taking apparatus has an image pickup element which photoelectrically converts an image of an object formed by an image-taking optical system including a focusing lens, and a signal processing circuit which produces an image signal based on an output signal from the image pickup element and has an electronic zoom function of electrically processing a part of the image signal to produce an enlarged output image. The image-taking apparatus also has a detection unit which detects a defocus amount between two image of the object, and a focus control circuit which controls a drive of the focusing lens in a first control method based on the output signal from the image pickup element and a second control method based on an output signal from the detection unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.