Design of an auto-focusing actuator with a flexure-based compliant mechanism for mobile imaging devices

Kim, Choong; Song, Min‐Kyu; Kim, Young‐Jun; Park, No Cheol; Park, Kyoung Su; Park, Young Pil; Shin, Ki Soon; Kim, Jeen Gi; Lee, Geum Sik

doi:10.1007/s00542-013-1873-1

Cited by 13 publications

(7 citation statements)

References 15 publications

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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%

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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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Section: Dynamics Modelingmentioning

confidence: 99%

“…In addition, a new autofocusing device with a flexure hinge and a voice coil motor (VCM) is proposed for mobile imaging devices in Ref. 13. By using flexure mechanism, the serious friction problems and weaknesses of conventional mechanisms due to the misalignment of driving force and guiding axis of the supporting mechanism are overcome.…”

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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“…The CPS, XY stage, and Z stage were displaced in the range from a few micrometers to hundreds of micrometers. The overall system of nanoindentation tester is supported by two supporters (12) and bottom plat (10). Two screws (13) were used to adjust and remain overall weights and system at equilibrium station replied on two sliders (14).…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…Recently, the microscopes also are potential cameras to replace to allow an automatic imaging process and decrease focus positioning error and operation's influences. It can find various applications such as cell microscopy [4], imaging [5], scanning microscopy metrology and nanolithography [6,7], cellular camera phone [8], the image sharpness identification [9], laser probe system [10], and imaging cameras [11][12][13]. However, these systems have still some limitations due to their heavy weight and complex design.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of a Dragonfly-Inspired Compliant Joint for Camera Positioning System of Nanoindentation Tester Based on a Hybrid Integration of Jaya-ANFIS

Chau

Dao

Nguyễn

2018

Mathematical Problems in Engineering

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Camera positioning system is a critical member of a nanoindentation tester characterizing the mechanical properties such as hardness, creep, surface roughness, or elastic modulus of a material sample. This paper presents a design optimization for a dragonfly-inspired compliant joint. This joint is used to drive the camera positioning system. A new hybrid approach of Taguchi method, adaptive neuro-fuzzy inference system (ANFIS), and Jaya algorithm is developed to solve the multi-objective optimization problem. The Taguchi method is used to build the numerical data and to find the best membership functions for the ANFIS structure by minimizing the root mean squared error. Then, the weight factor of each objective function is determined by established equations well. Subsequently, a structure of ANFIS is developed to map the design parameters and responses. Sensitivity analysis of each controllable parameter is analyzed by the statistical method. Finally, Jaya algorithm is initialized to find the optimal solution. The results found that the optimal displacement, frequency, and stress are about 12581.11 μm, 67.76 Hz, and 333.68 MPa, respectively. The proposed hybrid optimization algorithm is a robust and effective optimizer and considered as soft computing technique for engineering optimization problems.

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“…This paper focuses on the design of in-plane 3-DOC (degree of constraint), i.e., outof-plane 2R1T (R: revolute; T: translational), flexure parallel mechanisms. The 3-DOC flexure mechanism can be used as a coordinating measuring machine (Liu et al, 2003), a planar compositional unit of the guiding mechanism of linear actuators (Teo et al, 2015;Awtar and Slocum, 2005;Kim et al, 2013), a compositional unit of the continuum robot (Qiu et al, 2016), or an independent micro-/nano-manipulator (Yu et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of symmetric and compact 2R1T (in-plane 3-DOC) flexure parallel mechanisms

Hao

2017

Mech. Sci.

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Abstract. Symmetry is very necessary in flexure mechanisms, which can eliminate parasitic motions, avoid buckling, and minimize thermal and manufacturing sensitivity. This paper proposes two symmetric and compact flexure designs, in-plane 3-DOC (degree of constraint) mechanisms, which are composed of 4 and 6 identical wire beams, respectively. Compared to traditional leaf-beam-based designs, the two present designs have lower stiffness in the primary motion directions, and have smaller stiffness reduction in the parasitic directions. Analytical modelling is conducted to derive the symbolic compliance equations, enabling quick analysis and comparisons of compliances of the two mechanisms. A prototype has been tested statically to compare with analytical models.

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Design of an auto-focusing actuator with a flexure-based compliant mechanism for mobile imaging devices

Cited by 13 publications

References 15 publications

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

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

Optimal Design of a Dragonfly-Inspired Compliant Joint for Camera Positioning System of Nanoindentation Tester Based on a Hybrid Integration of Jaya-ANFIS

Design and analysis of symmetric and compact 2R1T (in-plane 3-DOC) flexure parallel mechanisms

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