Focus control apparatus for digital imaging device
US7535510B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2004 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Dec 9, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/67
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus control apparatus controls a step motor and a piezoelectric material into order to control a focal distance between an electronic imaging device and a lens unit. The focus control apparatus has an image calculating unit for processing an image signal taken by the electronic imaging device into a resolution value, a displacement controlling unit receiving the resolution value in order to determine an optimal focal distance between the electronic imaging device and the lens unit and output a displacement controlling signal, a step motor controller and a piezoelectric material controller. The displacement controlling signal is supplied to the step motor controller or the piezoelectric material controller to control optimally the distance between an electronic imaging device and a lens unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.