Focus adjustment apparatus, image pickup apparatus, and control method
US7518807B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2007 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Oct 27, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus adjustment apparatus comprises a moving unit configured to move a focusing lens, a focus adjusting unit configured to move the focusing lens such that the sharpness of an image obtained from an image pickup unit picking up an object image is increased, and an in-focus position measuring unit configured to measure an in-focus position in a different manner from the focus adjusting unit. The focus adjusting unit moves the focusing lens to the in-focus position measured by the in-focus position measuring unit when a direction of movement of the focusing lens in which the image sharpness is increased is matched with the direction of a current position of the focusing lens relative to the in-focus position measured by the in-focus position measuring unit, and does not move the focusing lens to the measured in-focus position when both the directions are not matched with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.