Development of Small Sized Actuator With Compliant Mechanism for Optical Image Stabilization

Song, Min; Baek, Hyunwoo; Park, No−Cheol; Park, Kyoung‐Su; Yoon, Taehee; Park, Young−Pil; Lim, Soo-Cheol

doi:10.1109/tmag.2010.2042288

Cited by 52 publications

(23 citation statements)

References 4 publications

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“…It is also called as sensitivity [4]. Note that the back EMF of VCM can be neglected due to the much faster dynamics of VCM electricity than motion of the moving lens.…”

Section: Optimal Design Of the Vcm And Springmentioning

confidence: 99%

Design and Simulation of a New Miniature Camera Module Using Voice Coil Motor for Optical Image Stabilization

Han¹,

Zhang²,

Xie³

2017

dtetr

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Abstract. This paper proposes a new design for miniature camera module, which is mainly used to realize optical image stabilization for mobile device with dual-camera. It can compensate the 3 degrees vibration disturbance introduced by the user's hand-shake. Finite element analysis (FEA) and design of experiments (DOE) are introduced to find the optimum design. Controller design and simulations based on actual hand-shake data collected from the gyro sensors are presented. Simulation results show that the designed camera module can compensate hand-shake up to 50Hz in 3 degrees.

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“…It is also called as sensitivity [4]. Note that the back EMF of VCM can be neglected due to the much faster dynamics of VCM electricity than motion of the moving lens.…”

Section: Optimal Design Of the Vcm And Springmentioning

confidence: 99%

Design and Simulation of a New Miniature Camera Module Using Voice Coil Motor for Optical Image Stabilization

Han¹,

Zhang²,

Xie³

2017

dtetr

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“…Extracting the term from the kinetic energy function of parts a, b, c, d, and e (these parts are indicated in Fig. 5), one can get the equation of overall kinetic energy as shown below: (12) where the equivalent mass is expressed by (13) where the mass of each part of the multi-stage leaf spring is shown below.…”

Section: Dynamics Modelingmentioning

confidence: 99%

“…For example, a small sized actuator with compliant mechanism is proposed in Ref. 12, which is free of friction. As a result, the open-loop control becomes possible and the performance of optical image stabilization is improved.…”

Section: Introductionmentioning

confidence: 99%

Design of a flexure-based auto-focusing device for a microscope

Liu

2015

Int. J. Precis. Eng. Manuf.

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This paper presents the design, fabrication, and testing procedures of a compliant auto-focusing device for a microscope. To obtain a long focusing range, a new flexure positioning mechanism is devised based on multi-stage leaf springs. The proposed device allows a precise focusing without friction and backlash effects. A voice coil motor is employed to drive the positioning mechanism. The stiffness model and resonant-frequency model are developed analytically. These models are employed for an architectural optimization of the mechanism parameters to maximize the resonant frequency under the driving stroke and force constraints. The performance of the designed flexure mechanism is validated through finite-element analysis (FEA) simulation investigations. Results show that the positioning mechanism enables a long focusing range over 10 mm with a resonant frequency higher than 50 Hz, which allows an auto-focusing operation with rapid response. Moreover, a prototype is fabricated for experimental studies. LabVIEW software with Vision Development Module is adopted for image processing in the auto-focusing process. By employing the standard deviation of the image grayscale as the criterion of focusing, an exhaustive search method is used to determine the focusing point. Experimental results demonstrate the effectiveness of the developed auto-focusing device.

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“…사용하는 방식, [5] 보이스코일 모터(voice coil motor)를 이용하는 방식, [6] MEMS로 제작한 콤드라이브(comb drive)를 사용하는 방 식 [7] 등에 대한 연구가, 스테이지 체결방식에 따라 병진조인트를 사용하는 방식, [8] 볼베어링을 사용하는 방식, [9] 와이어 서스펜션을 사용하는 방식 [10] 에 …”

Section: 서 론unclassified

H_∞Control on the Optical Image Stabilizer Mechanism in Mobile Phone Cameras

Lee

2014

Journal of the Korean Society of Manufacturing Technology Engin

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ARTICLE INFO ABSTRACT Article history:This study proposes a closed-loop shaping control method with H ∞ optimization for optical image stabilization (OIS) in mobile phone cameras. The image stabilizer is composed of a horizontal stage constrained by ball bearings and actuated by the magnetic force from voice coil motors. The displacement of the stage is measured by Hall effect sensors. From the OIS frequency response experiment, the transfer function models of the stage and Hall effect sensor were identified. The weight functions were determined considering the tracking performance, noise attenuation, and stability with considerable margins. The H ∞ optimal controller was executed using closed-loop shaping and limiting the controller order, which should be less than 6 for real-time implementation. The control algorithm was verified experimentally and proved to operate as designed.

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Development of Small Sized Actuator With Compliant Mechanism for Optical Image Stabilization

Cited by 52 publications

References 4 publications

Design and Simulation of a New Miniature Camera Module Using Voice Coil Motor for Optical Image Stabilization

Design and Simulation of a New Miniature Camera Module Using Voice Coil Motor for Optical Image Stabilization

Design of a flexure-based auto-focusing device for a microscope

H_∞Control on the Optical Image Stabilizer Mechanism in Mobile Phone Cameras

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Development of Small Sized Actuator With Compliant Mechanism for Optical Image Stabilization

Cited by 52 publications

References 4 publications

Design and Simulation of a New Miniature Camera Module Using Voice Coil Motor for Optical Image Stabilization

Design and Simulation of a New Miniature Camera Module Using Voice Coil Motor for Optical Image Stabilization

Design of a flexure-based auto-focusing device for a microscope

H∞Control on the Optical Image Stabilizer Mechanism in Mobile Phone Cameras

Contact Info

Product

Resources

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H_∞Control on the Optical Image Stabilizer Mechanism in Mobile Phone Cameras