Open-Loop Control of Voice Coil Motor With Magnetic Restoring Force Using High-Low Frequency Composite Signals

This study proposed an approach to control voice coil motors (VCMs) installed in smartphone modules as autofocus actuators. The VCM developed in this study comprises guide rods. The magnetic field attraction force between guide rods and movable parts serves as lens restoring force. This study did not use feedback elements to avoid the stick-slip phenomenon between VCM guide rods and movable parts. Instead, this study used a high–low frequency composite signal based on the findings from a mathematical model analysis and VCM dynamic attribute analysis, preventing stick-slip and offering the VCM a more favorable positioning precision.

[1]  Zhixin Sun,et al.  A Smart Automated Signature Extraction Scheme for Mobile Phone Number in Human-Centered Smart Home Systems , 2018, IEEE Access.

[2]  Chien-Sheng Liu,et al.  Design of VCM actuator with L-shape coil for smartphone cameras , 2018 .

[3]  Burhanettin Koc,et al.  Piezoelectric actuator for mobile auto focus camera applications , 2009 .

[4]  Wei Jiang,et al.  Liquid lens with double tunable surfaces for large power tunability and improved optical performance , 2011 .

[5]  Chien-Sheng Liu,et al.  Design of miniaturized optical image stabilization and autofocusing camera module for cellphones , 2017 .

[7]  Chien-Sheng Liu,et al.  Design and Experimental Validation of Novel Force Sensor , 2015, IEEE Sensors Journal.

[8]  Dean Karnopp,et al.  Computer simulation of stick-slip friction in mechanical dynamic systems , 1985 .

[9]  Noboru Niguchi,et al.  Dynamic Modeling and Control of Three-Degree-of-Freedom Electromagnetic Actuator for Image Stabilization , 2018, IEEE Transactions on Magnetics.

[10]  Qiong-Hua Wang,et al.  Holographic Zoom System Having Controllable Light Intensity Without Undesirable Light Based on Multifunctional Liquid Device , 2019, IEEE Access.

[11]  Chien-Sheng Liu,et al.  Design of VCM actuator with the chamfered edge magnet for cellphone , 2017 .

[12]  Hui Chu,et al.  Antenna-in-Package Design and Robust Test for the Link Between Wireless Ingestible Capsule and Smart Phone , 2019, IEEE Access.

[13]  Chien-Sheng Liu,et al.  A Compact Low-Cost Camera Module with Modified Magnetic Restoring Force , 2017 .

[14]  Hsing-Cheng Yu,et al.  Adaptive Fuzzy Logic Proportional-Integral-Derivative Control for a Miniature Autofocus Voice Coil Motor Actuator With Retaining Force , 2014, IEEE Transactions on Magnetics.

[15]  Chien-Sheng Liu,et al.  Design of VCM actuator for optical zooming smartphone cameras , 2019 .

[16]  Sang-Wook Kim,et al.  SoC design of an auto-focus driving image signal processor for mobile camera applications , 2006, 2006 Digest of Technical Papers International Conference on Consumer Electronics.

[17]  Seung-Yop Lee,et al.  A mobile auto-focus actuator based on a rotary VCM with the zero holding current. , 2009, Optics express.

[18]  Chen Xinglin,et al.  Study on criterion about overcoming low-speed stick-slip of simulator , 1999 .

[19]  Chien-Sheng Liu,et al.  Miniature auto-focusing voice coil motor actuator with excellent shock resistance , 2012 .

[20]  Chien-Sheng Liu,et al.  Design and Characterization of Miniature Auto-Focusing Voice Coil Motor Actuator for Cell Phone Camera Applications , 2009 .