Mobile terminal and auto-focusing method using a lens position error compensation
US7693411B2 · kind B2 · utility
30Cited by
3References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 10, 2007 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Feb 18, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mobile terminal and auto-focusing method for the same are disclosed. The auto-focusing method uses a lens position error compensation and includes: detecting a target object during a photograph mode; determining a lens position at which a focus value gradient related to the detected target object changes sign while moving a lens of the camera module in units of one step size; and performing lens position compensation by moving the lens to the found lens position. As a result, the lens position errors caused by a conventional a voice coil motor are compensated, thereby providing rapid and fine auto-focusing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.