Design of a Voice Coil Motor Actuator With L-Shape Coils for Optical Zooming Smartphone Cameras

Chang-Lin Hsieh,Chien-Sheng Liu

doi:10.1109/access.2020.2968723

Abstract

This paper proposes a voice coil motor (VCM) with a novel electromagnetic structure for smartphone OZ actuators, and the advantages of this novel design are its long displacement, compact size, and more powerful and stable Lorentz force. These advantages are achieved by the novel electromagnetic structure that consist of L-shape coils. Its performances were verified by a laboratory-built prototype, and the experimental results (Lorentz force $F_{VCM}$ , response time, and zoomed images) can prove the proposed VCM actuator is feasible and vigorous.

Highlights

IntroductionBecause the smartphone has developed rapidly over the past decade, it offers more convenience for human life [1], [2]
The command of the current is inputted from the computer, and the command drives the OP-Amp through the NI-9263 DAQ card to supply the voice coil motor (VCM) (see the Fig. 10 (b)) with current
When the current is inputted to the coils to generate the Lorentz force, FVCM, the output voltage that can be converted into the Lorentz force, FVCM, of the load cell is sent to the computer through the NI-9220 DAQ card

Summary

Introduction

Because the smartphone has developed rapidly over the past decade, it offers more convenience for human life [1], [2]. Smartphone manufacturers keep researching on innovative functions for smartphones; they enhance the functions that have equipped on the smartphones. These days, the auto-focusing (AF) function has become the basic function, and it does not be emphasized anymore. Equipping camera modules with the optical image stabilization (OIS) function to the smartphone is the mainstream now. Comparing to the professional photographic equipment that is known as digital single lens reflex (DSLR) camera, the camera modules for smartphones lack for the high-magnification optical zoom (OZ) function. The camera module with the high-magnification OZ is not widely equipped for the camera module because there are many defects need to be improved

Methods

Results

Conclusion