Apparatus and method for controlling auto focus of camera module
US9883098B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2017 |
| Grant date | Jan 30, 2018 |
| Priority date | — |
| Expiry date | Mar 9, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2203/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed are an apparatus and method for controlling auto focus of a camera module. The present invention includes a lens unit, a moving coil, a fixed coil, and a controller configured to provide a signal comprising first frequency signal and second frequency signal to the moving coil, the fixed coil receiving the variable current or the variable voltage through the second frequency signal, calculate a focus position value based on the received variable current or the variable voltage and an image signal, and control the lens unit to move by applying the first frequency signal to the moving coil according to the calculated focus position value, wherein the controller is further configured to detect a temperature change of the fixed coil and to correct a focus position of the lens unit corresponding to the detected temperature change of the fixed coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.