Focus control circuit for adjusting the focus by moving a lens
US8190014B2 · kind B2 · utility
9Cited by
7References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 9, 2010 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Jun 9, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus control circuit is installed in an image pickup apparatus including a lens, a driver element for adjusting the position of the lens, and a position detecting element for detecting the position of the lens. A feedback equalizer included in the focus control circuit generates a drive signal used to adjust the position of the lens to a target position, based on a difference between the position of the lens identified by the output signal of the position detecting element and the target position of the lens set externally, and controls the driver element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.