Control of tiny ultrasonic linear actuator using magneto-resistive sensor for camera module

Woo Suk Jung, Chong Yoon Kang, Jeong Do Kim, Seok Jin Yoon

Research output: Contribution to journalArticlepeer-review


This article presents a control method for a tiny ultrasonic linear actuator for a camera module. The actuator is operated by a smooth impact driving method and an inertia displacement principle, and the structure of the actuator is very simple and lightweight. To precisely control the actuator, an actuator driver circuit has been developed that uses a small and inexpensive magneto-resistive sensor. The magneto-resistive sensor measures the changing magnetic field from a magnet attached to a mobile element and has a period of 400 μm, which is scaled by 400 divisions, resulting in 1 μm resolution. A proportional-integral-derivative control is used for controlling precise position. Finally, to verify the movement characteristics of the tiny ultrasonic linear actuator using a magneto-resistive sensor, a laser Doppler vibrometer (Polytec) was used Generally, the autofocus function of a camera module needs a 10 μm resolution with a 1-mm stroke. The experimental results show that the actuator with the magneto-resistive sensor is suitable for the camera autofocus function.

Original languageEnglish
Pages (from-to)22-32
Number of pages11
JournalElectric Power Components and Systems
Issue number1
Publication statusPublished - 2010 Jan
Externally publishedYes


  • Autofocus function
  • Magneto-resistive sensor
  • Ultrasonic actuator

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Control of tiny ultrasonic linear actuator using magneto-resistive sensor for camera module'. Together they form a unique fingerprint.

Cite this