• Title/Summary/Keyword: Focusing Actuator

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A Study on the Focusing Actuator of Ultra Small Optical Drive (초소형 광드라이브용 포커싱 액츄에이터 설계 연구)

  • 손도현;홍삼열;김진아;김영중;최인호;김진용
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.234-238
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    • 2003
  • Ultra small optical drive or PCMCIA type needs a focusing actuator because or applying Blue Laser and enhancing compatibility according to disk physical specification. Based on this need, this paper presents a novel focusing actuator adapted for ultra small optical drive of PCMCIA type. The focusing actuator using Lorenz force generated consists of coil, magnets and plate springs of pivoting. The design issues of the focusing actuator are the flexibility to focus direction, the rigidity to track direction and the higher natural mode of the moving part. For settling these Issues, this paper present mechanical design, computer simulations and test results of the realized focusing actuator. Finally, suitability and usefulness of the focusing actuator was demonstrated by the comparison of simulations and test results in a view of the possibility adapted for ultra small optical drive.

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Halbach Array Type Focusing Actuator for Small and Thin Optical Data Storage Device (할바 자석배열을 이용한 초소형 정보저장장치의 초점 구동기 설계)

  • Lee, Sung-Q;Park, Kang-Ho;Paek, Mun-Cheal
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.65-69
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    • 2004
  • The small form factor optical data storage devices are developing rapidly nowadays. Since it is designed for portable and compatibility with flash memory, its components such as disk, head, focusing actuator, and spindle motor should be assembled within 5 m thickness. The thickness of focusing actuator is within 2 mm and the total working range is $+/-100{\mu}m$, with the resolution of less than $1{\mu}m$. Since the thickness is limited tightly, it is hard to place the yoke that closes the magnetic circuit and hard to make strong flux density without yoke. Therefore, Halbach array is adopted to increase the magnetic flux of one side without yoke. The proposed Halbach array type focusing actuator has the advantage of thin actuation structure with sacrificing less flux density than conventional magnetic array. The optical head unit is moved on the swing arm type tracking actuator. Focusing coil is attached to swing arm, and Halbach magnet array is positioned at the bottom of deck along the tracking line, and focusing actuator exerts force by the Fleming's left hand rule. The working range and resolution of focusing actuator are analyzed with FEM and experiment.

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Focusing Servo System in Pickup Actuator with friction (마찰이 존재하는 픽업 구동기의 포커싱 서보 시스템)

  • 이정현;한창수;원종화;윤형덕;김수현;곽윤근
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.346-350
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    • 1996
  • In optical disk drives, one of commonly used pickup actuator is a Sliding and rotary type of pickup actuator which is cheaper than other pickup actuators and has simple assembly. However, it reported that non-linearity due to friction between a shaft and a sleeve had to be considerably analyzed in design and servo system in employing this type of pickup actuator. In this paper, this friction is modeled as a Coulomb's friction and the effect of friction is examined in the simulation. A digital servo system is applied to pickup actuator with friction in order to have good focusing servo. To enhance focusing servo performance using digital servo merit, frist PD-controller is applied to have fast response performance, second lead-lag compensator is applied to have stable focusing performance.

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HVCM (Hybrid Voice Coil Motor) Actuator apply performance improvement through the AUTO Focusing Camera Module (HVCM(Hybrid Voice Coil Motor) Actuator적용을 통한 AUTO Focusing Camera Module 성능개선)

  • Kwon, Tae-Kwon;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.05a
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    • pp.307-309
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    • 2011
  • The recently-released camera modules assembled into high-end handsets generally carry auto focusing function. The resolution size of the camera modules is getting higher, and customers demand more precise and stable auto focusing function. When auto focusing function is getting performed, the camera modules applied to VCM usually have the problems, which are an error of lens focusing position and resolution deviation according to the shift of one's position. For this reason, I propose Hybrid VCM that has an improved structure for a stable work of actuator and higher resolution level.

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Change the structure of VCM Actuator AUTO Focusing the camera module performance optimization through (VCM(Voice Coil Motor) Actuator변경구조를 통한 AUTO Focusing 카메라모듈 성능최적화)

  • Kwon, Tae-kwon;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.6
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    • pp.1381-1385
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    • 2011
  • Hand-phone in the recently released high-end applied to the Camera Module is equipped with the most features Auto Focusing Camera Module and much greater importance of the pixel count is much more precise and reliable AF-powered products are being demanded by consumers. This paper is available now apply the Camera Module VCM (Actuator) for Auto Focusing Lens focal point of the problem location and resolution of positional deviation occurs Module Warranty and stable resolution of the improved structure for Actuator Drive Change the structure VCM is proposed

Development of A Small VCM Focusing Actuator (초소형 VCM 포커싱 액츄에이터 개발)

  • Shin, Young-Chul;Lee, Seung-Yop;Park, Young-Phil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.750-755
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    • 2005
  • This paper proposes a small VCM (Voice coil motor) type actuator using curved suspensions for auto-focusing and zoom motions for mobile information devices. 1'he proposed focusing actuator adopts a nontraditional type of suspension using curved beams in order to extend output displacement within small height restriction. The curved beam is similar to the leaf spring type which is usually used in optical disk drives. In addition, three different materials are considered for the curved suspension model, and Aluminum shows the best dynamic characteristics. The proposed zoom actuator does not use a suspension supporting bobbin but a moving rail and a sloper mechanism by generating rotational force at lens holder. The sensitivity of design parameters on output performance is studied using ANSYS (3D FEM tool). Experiments using a prototype of the proposed actuator model verified the analytical prediction and performance.

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Development of A Small VCM Focusing Actuator Using Curved Suspensions (곡선 서스펜션을 사용한 초소형 VCM 포커싱 구동기 개발)

  • Shin, Young-Chul;Lee, Seung-Yop
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.1
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    • pp.11-19
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    • 2008
  • This paper proposes small VCM(voice coil motor) type, auto-focusing and zoom actuators for mobile information devices. In order to meet the large output displacement within small height restriction, the proposed auto-focusing actuator adopts curved suspensions, which are similar to a leaf-spring type suspension of optical disk drives. The sensitivity of design parameters on output displacement and dynamic performance is implemented using ANSYS (3D FEM tool) to determine the optimal geometry and stiffness of the curved suspensions. This paper also investigates a new zoom actuator without a suspension supporting a bobbin. The zoom actuator uses a moving rail and a stoper mechanism by generating rotational force at lens holder. Magnetic flux density of the zoom actuator are calculated by both the FEM and permeance method. Experiments using prototypes of the proposed focusing and zoom models show that both actuators meet the required displacement and performance.

Design of a Slim-Type Auto-Focusing Module with a Cam Structure (캠 구조를 가지는 초소형 자동초점 모듈 설계)

  • Kim, Kyung-Ho;Lee, Seung-Yop;Shin, Bu-Hyun;Kim, Soo-Kyung
    • Transactions of the Society of Information Storage Systems
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    • v.5 no.1
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    • pp.1-7
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    • 2009
  • Recently, the growing market demand for small and slim mobile phone cameras requires the size reduction of the camera module. In this paper, an auto-focusing actuator for camera phones is proposed by converting the rotational motion by a rotary VCM actuator into the linear motion using a novel cam structure. This new concept for auto-focusing module enables the reduction of the module thickness and low power consumption. This paper presents the theoretical analysis and optimal design for VCM actuator, cam structure and preload spring. Finally, the experimental results using a prototype with the size of $9.9{\times}9.9{\times}5.9\;mm^3$ are compared with the theoretical predictions.

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3-axis Moving Magnet Type Actuator (가동 자석형 3 축 구동 엑츄에이터)

  • Hur, Young-Jun;Song, Myeong-Gyu;Park, No-Cheol;Yoo, Jeong-Hoon;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.1033-1036
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    • 2007
  • The optical disc drive has used a high NA objective lens and a shorter wavelength laser diode for high recording density. But high NA and shorter wavelength cause several margins to become short. Focusing and tracking servo has to be more accurate and active tilt compensation mechanism is also needed for coma aberration compensation. In this paper, we proposed 3-axis moving magnet type actuator. For 3-DOF motion, moving coil actuator has to equip 6 wires for supplying 3 independent signals. However, moving magnet type actuator doesn't need to change the configuration of wires because coils are in stator. So, we added tilting mechanism to 2-axis moving magnet actuator which is designed in previous research. Addition of the tilting mechanism cuts down the focusing sensitivity. So, maximization the tilting sensitivity and securing the focusing sensitivity are objectivities of this research. DOE (design of experiments) procedures of electromagnetic circuit are performed for parameter study and the optimization is also performed to maximize the tilt sensitivity. And then the final design is suggested and its performance is verified by FE simulation.

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A Piezoelectric Lens Actuator for Mobile Information Devices (모바일 기기용 렌즈 구동 압전형 액츄에이터 개발)

  • Lee, Hun-Tae;Lee, Seung-Yop;Park, Young-Phil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.744-749
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    • 2005
  • In this paper, a lens actuator for mobile devices is proposed using stack type piezoelectric materials. In general, the deformation of PZT actuators is not enough for lens motion when the allowed voltage is applied. The small stroke problem can be solved by accumulating a lot of small displacements in high frequency. In this paper, a new inch-worm type model for focusing actuator is suggested based on the interaction of inertial and frictional forces. Theoretical analysis and simulation using ANSYS are performed to verify the feasibility of the inch-worm PZT actuator model. Various types of clamps are considered to determine the effect of frictional force on the motion, and appropriate clamp-actuator models are proposed. The proposed models are experimentally verified and the experimental results show high correspondence with theoretical and simulated values. The inch-worm type focusing actuator enable a large stroke with 7.79 mm/sec with 10kHz and 10V.

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