Abstract
Autofocusing actuators in camera phones should have a reduced profile and an improved performance in accordance with the requirements of consumer electronic products. In this study, we first discuss the detailed design of the miniature actuator presented in our previous work(10) and then describe an experiment to test its positioning repeatability. As compared with conventional voice coil motor (VCM) actuators positioned by open-loop control, the proposed miniature VCM actuator is small, has a high positioning repeatability and can improve the positioning repeatability by 87.5% of the typical value.
Highlights
The mobile camera phone market has increased markedly, with regard to the integration of high-end camera functions.[1,2] Many studies have contributed to the development of camera modules, for example, voice coil motors (VCMs), piezoelectric motors, and tunable microlenses, for cell phone applications.[3,4,5] Among these modules, the VCMs are the most promising modules owing to their low cost, low power consumption, fast response, high repeatability, and small size.[6] it has been noted that these features are intrinsically important for future commercial applications
To the best of our knowledge, the studies reported in the literature pertaining VCM actuators focused only on their fast dynamic response and low power consumption.[7,8,9] to satisfy the requirements of an autofocusing camera module, a VCM actuator should have a high positioning repeatability
To satisfy the requirements of the autofocusing camera module, a miniature VCM actuator was developed by our group.[10]. In this study, we first discuss the mechanical structure of the VCM actuator and subsequently provide detailed descriptions of its electromagnetic and electronic circuit designs
Summary
The mobile camera phone market has increased markedly, with regard to the integration of high-end camera functions.[1,2] Many studies have contributed to the development of camera modules, for example, voice coil motors (VCMs), piezoelectric motors, and tunable microlenses, for cell phone applications.[3,4,5] Among these modules, the VCMs are the most promising modules owing to their low cost, low power consumption, fast response, high repeatability, and small size.[6]. To the best of our knowledge, the studies reported in the literature pertaining VCM actuators focused only on their fast dynamic response and low power consumption.[7,8,9] to satisfy the requirements of an autofocusing camera module, a VCM actuator should have a high positioning repeatability. To satisfy the requirements of the autofocusing camera module, a miniature VCM actuator (size: 6.5×6.5×4 mm3) was developed by our group.[10] In this study, we first discuss the mechanical structure of the VCM actuator and subsequently provide detailed descriptions of its electromagnetic and electronic circuit designs. It is shown that as compared with the existing VCM actuators, the proposed VCM actuator is small (6.5×6.5×4 mm3) and has a high positioning repeatability (less than 5 μm)
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