Camera module and method for auto focus thereof
US11002939B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2016 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | Jan 29, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an apparatus and a method for controlling auto focus of a camera module including a voice coil motor actuator. The camera module includes a sensing unit configured to sense a movement of the lens unit and a controller configured to control the movement of the lens unit based on a sensing signal sensed by the sensing unit. If an initial operation command is received, the controller moves the lens unit to an end point of a maximum movement range. If the lens unit is positioned at the end point of the maximum movement range, the controller compares the sensing signal sensed by the sensing unit with a predetermined reference signal to calculate a compensation value for an error. If a focus operation command is received, the controller can move the lens unit to a focus position based on the calculated compensation value and compensate for the focus position of the lens unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.