Low power consumption focusing actuator for a mini video camera

Hsing Cheng Yu*, Tzung Yuan Lee, Shir-Kuan Lin, Li Te Kuo, Shyh Jier Wang, Jau Jiu Ju, Der-Ray Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A novel low power consumption autofocusing actuator in a mini video camera is constructed in accordance with the result of a systematic design procedure of voice coil motors (VCM). This paper emphasizes the position control of such a VCM. The position feedback signals are provided by a magnetoresistive (MR) encoder. The position estimation algorithm (PEA) is developed to precisely decode the MR signals for the position of the moving part of the VCM. Different postures change the loading of the moving part of the VCM, so that an adaptive model-following control system based on the PEA is proposed to compensate for the loading variation. The experiments verify the fast dynamic performance and high power efficiency of the VCM.

Original languageEnglish
Article number08R901
JournalJournal of Applied Physics
Issue number8
StatePublished - 25 May 2006

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