Design and Characterization of Miniature Auto-Focusing Voice Coil Motor Actuator for Cell Phone Camera Applications

Liu, Chien-Sheng; Lin, Psang Dain; Lin, Po‐Hung; Ke, Shun-Sheng; Chang, Yu-Hsiu; Horng, Ji-Bin

doi:10.1109/tmag.2008.2006564

Cited by 77 publications

(21 citation statements)

References 17 publications

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“…During AF actuation, the Lorentz force is larger than the sum of the moving part weight and the restoring spring force. Moreover, the spring resistance is in direct proportion to the vertical displacement of the moving part [2]. As a result, such VCM actuators typically have dimensions in the order of 10mm × 10mm × 4.6mm [13].…”

Section: Comparison Of Proposed Auto-focusing Module Andmentioning

confidence: 99%

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Design of Auto-Focusing Modules in Cell Phone Cameras

Lai

Liu

2011

International Journal on Smart Sensing and Intelligent Systems

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Section: Comparison Of Proposed Auto-focusing Module Andmentioning

confidence: 99%

“…Thus, a compact auto-focusing module for AF has to meet demands for reducing both dimension and power consumption. Various AF actuators for phone cameras have been considered by many researches [1][2][3]. In general, there are two types of AF actuators that are used in phone cameras.…”

Section: Introductionmentioning

confidence: 99%

Design of Auto-Focusing Modules in Cell Phone Cameras

Lai

Liu

2011

International Journal on Smart Sensing and Intelligent Systems

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“…However, for nonlinear endomicroscopy, a high numerical aperture (NA) lens with superior achromaticity is required [1,11,12], and this is particularly challenging for a tunable lens [13]. Another way to achieve depth scanning is to directly translate the endomicroscope optics, using technologies such as shape memory alloys (SMA) [14], voice coil motors (VCM) [15], or pneumatic actuation [16]. Among the various technologies, SMA wires have shown promise in extending 2D endoscopic imaging to 3D; by Joule heating, the SMA wire contracts and moves the endomicroscope optics to change the beam focus [14].…”

Section: Introductionmentioning

confidence: 99%

Focus scanning with feedback-control for fiber-optic nonlinear endomicroscopy

Liang

Guan

et al. 2017

Biomed. Opt. Express

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Fiber-optic endomicroscopes open new avenues for the application of non-linear optics to novel in vivo applications. To achieve focus scanning in vivo, shape memory alloy (SMA) wires have been used to move optical elements in miniature endomicroscopes. However, this method has various limitations, making it difficult to achieve accurate and reliable depth scanning. Here we present a feedback-controlled SMA depth scanner. With a Hall effect sensor, contraction of the SMA wire can be tracked in real time, rendering accurate and robust control of motion. The SMA depth scanner can achieve up to 490 µm travel and with open-loop operation, it can move more than 350 µm within one second. With the feedback loop engaged, submicron positioning accuracy was achieved along with superior positioning stability. The high-precision positioning capability of the SMA depth scanner was verified by depth-resolved nonlinear endomicroscopic imaging of mouse brain samples.

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“…The power consumption of the electromagnetic actuator should not exceed the critical temperature (the melting point) of the coil coating or the working temperature of permanent magnets. Among electromagnetic actuators, a voice coil actuator that uses Lorentz force has been studied for various applications such as hard disk drive [9], vibration isolation [5,6], lens focusing [10], high-precision stage [11] and fast-steering mirror [12]. In comparison with a solenoid actuator, the voice coil actuator has a somewhat lesser force capacity but a remarkable linearity between the current and force.…”

Section: Introductionmentioning

confidence: 99%

Design of a Rectangular-Type Voice Coil Actuator for Frame Vibration Compensation

Choi¹,

Ahn²,

Gweon³

et al. 2016

Journal of Magnetics

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Precision motion stages used in the manufacturing process of flat-panel displays have inevitably low settling performance due to their huge mass and bulky structures. In order to improve the settling performance, several methods of frame vibration compensation have been developed so far. These methods are used to cancel the vibration by imposing a counter force or modifying the resonance mode of the frame of the stage. To compensate the frame vibration, high force actuators are required. In this paper, a mighty voice coil actuator is proposed to generate the counter force against the frame vibration. The proposed voice coil actuator has an axis-symmetric rectangular structure to achieve a large force with simple and low cost fabrication. Also, the voice coil actuator allows radial clearance up to ± 4 mm. Using an optimized design process and a magnetic circuit model, the power consumption is minimized while the required force is obtained. With a power of 322 W, the VCA has been designed to have a maximum force of 574 N with a force constant of 164 N/A. Experimental results verified the force constant of the fabricated voice coil actuator is well matched with the designed value.

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Design and Characterization of Miniature Auto-Focusing Voice Coil Motor Actuator for Cell Phone Camera Applications

Cited by 77 publications

References 17 publications

Design of Auto-Focusing Modules in Cell Phone Cameras

Design of Auto-Focusing Modules in Cell Phone Cameras

Focus scanning with feedback-control for fiber-optic nonlinear endomicroscopy

Design of a Rectangular-Type Voice Coil Actuator for Frame Vibration Compensation

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