• Title/Summary/Keyword: 광픽업

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A Study on the Optimum Design Method of Optical Pick-Up Actuators (광 픽업 구동기의 최적설계에 관한 연구)

  • 김선모;김석중;이용훈
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11b
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    • pp.786-790
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    • 2001
  • In this paper, we propose an optimum design method for optical pick-up actuators. Using this method, we can design an optimal pick-up actuator having the required tracking/focusing performances. Also, the designed actuator has the small mass, force constant for small size of magnetic circuit and large resistance for reduction of heat generation. Simulation results show that this method can be potentially implemented in all the pick-up actuators.

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Mechanism Design of Optical Pickup Actuator for Fast Access of Optical Disk Drive (광디스크 드라이브의 고속 액세스를 위한 광픽업 액추에이터 메커니즘 설계)

  • 박준혁;이상헌;백윤수
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.12
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    • pp.109-119
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    • 2002
  • In this paper, mechanism design of optical pickup actuator for fast access is proposed. This actuator is composed of moving magnet type actuator and moving coil type actuator for tracking and fine motion, respectively. Moving magnet type tracking actuator is configurated by two permanent magnets and four air-core solenoids. Additional damper by induced current in tracking actuator can reduce the transient vibration between the coarse seeking servo and fine seeking servo. Variable stiffness can be acquired by applying current to air-core solenoid simply. This actuator can achieve fast access by these additional damper and stiffness. Performance of this actuator is predicted through the FEM, simulation and simple experiment. Settling time for transient vibration is reduced to 14.7% according to simulation result.

The design and manufacturing of micro fabricated optical pick-up head (Micro Fabricated Optical Pick-up 헤드 설계 및 제작)

  • Kim, I.H.;Park, K.B.;Jung, S.W.;Kim, K.N.;Moon, H.C.;Park, H.D.
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2263-2265
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    • 2000
  • 본 연구에서는 광 픽업의 소형, 경량 제작을 위해 MEMS 기술을 이용하여 planar micro optics 방법으로 광 픽업을 구성하는 micro lens, actuator, beamsplitter 등을 설계, 제작하고 집적화한 픽업헤드를 구성하여 그 특성을 분석하였다. 특성분석 결과 disk에 focusing 되는 beam의 형상은 circle type의 비교적 양호한 결과를 얻을 수 있었고 beam spot size는 약 22$\mu m$로 실제 system에서 요구되는 0.9$\mu m$이내의 beam spot size에 비해 약 25배 가량 큰 beam spot size를 얻을 수 있었다.

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A Study on Vibration Detection Method of Disc by Differential Amplifying Optical Power in Optical Disc Media (광 디스크 장치에서 광량 차동증폭에 의한 디스크 진동 검출 방안에 관한 연구)

  • 김진선;곽경섭
    • Journal of Korea Multimedia Society
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    • v.5 no.2
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    • pp.215-221
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    • 2002
  • In high speed optical disc devices, the vibration caused by unbalanced displacement leads the focus and tracking servo systems to be unstable, and increases the data search time. In this paper, we propose a new scheme to solve the unbalanced displacement problem. The proposed method detects the unbalanced rate by differential amplifying optical power received at photo diode and converts it into an electrical signal. controlling the speed of spindle motor, according to the detected unbalanced rate, makes it possible to improve the performance of tracking and data searching tasks. Also, we analyze the dynamic characteristics of focus and tracking servo systems in high speed mode and provide the firmware and hardware architecture that the proposed method can be installed as an add-on- module in the existing system.

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Velocity Profile Analysis to Reduce Residual Vibration in Optical Pick-up (광픽업 잔류 진동 저감을 위한 이송 속도 분포 해석)

  • 전홍걸;박영필
    • Journal of KSNVE
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    • v.10 no.2
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    • pp.221-228
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    • 2000
  • In this paper, analytical study is performed to reduce residual vibration in seeking mode of optical pick-up. The conditions for acceleration adn deceleration time in trapezoidal velocity profile to reduce residual vibration are derived for undamped vibration system. To verify the validity of conditiosn two example studies are carried out. Numerical and experimental implementations for flexible arm system attached to moving part show that residual vibration is effectively reduced by calculated velocity profile. In addition, simulation study for optical pick-up reveals that by changing natural frequency to resonance frequency the conditions derived assuming undamped system can be applied to obtain velocity profile for minimum residual energy in damped vibration system.

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Dynamic Characteristics of an Optical Pick-up Actuator Considering the Motion of a Feeding Deck (피딩데크 운동을 고려한 광픽업 액추에이터의 동특성 해석)

  • 신갑수;김원석;정진태
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.1
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    • pp.10-16
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    • 2004
  • There are a lot of roots of errors in a motion of the optical pick-up actuator being one of the most significantcomponents in a CD-ROM drive. Most of the studios recently performed have a tendency to seek for the causes from an actuator itself. This paper presents dynamic characteristics of an actuator affected by the motion of a feeding deck. The feeding system is modeled as a rigid body with eight degree-of-freedom. Using Largrange's equation, we derive linear equations of motion with respect to the rectangular coordinate. We found that the ranges of the natural frequencies of a feeding deck and the actuator are close to each other. The time responses are also computed by the Newmark method and Runge-Kutta method. The result show that it is important effect to consider feeding deck in modeling and designing an optical pick-up.

Actuating Characteristics of an Asymmetric Optical Pick-up Fine Actuator of a High Speed CD-ROM (고배속 CD-ROM용 비대칭형 광픽업 미세구동기의 구동특성)

  • 고상선;류제하;박기환;정호섭
    • Journal of KSNVE
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    • v.8 no.2
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    • pp.346-352
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    • 1998
  • This paper presents actuating characteristics of an asymmetric high-speed optical pick-up fine actuator that can be installed in a small area such as a notebook personal computer. In the asymmetric actuator four points (mass center, actuation center, supporting point of wire suspension on a bobbin, and optical axis) are not coincident so that the proposed actuator suspension reveals undesirable suspension resonance in the pitch and yaw direction. Lumped parameter dynamic model in each direction is used to investigate the driving characteristics with respect to relative location of the four points. Some of desired design directions toward reducing resonance peaks are suggested by using sensitivity information. In order to avoid undesirable resonance, at least supporting point on the obbin must be located in the middle of the mass and actuation center of the asymmetric pick-up actuator.

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Dynamic Characteristics of an Optical Pick-up Actuator Considering the mention of a Feeding Deck (피딩데크 운동을 고려한 광픽업 액츄에이터의 동특성 해석)

  • Shin, Kap-Soo;Chung, Jin-Tai;Kim, Won-Suk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.92-97
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    • 2002
  • There are a lot of roots of errors in an motion of the optical pick-up actuator being one of the most significant components in a CD-ROM drive. Most of the studies recently performed have a tendency to seek for the causes from an actuator itself. This paper present the dynamic characteristics of an actuator affected by the motion of a feeding deck. The feeding system is modeled as a rigid body with eight degree-of-freedom. Using Largrange's equation, we derive the linear equations of motion with respect to the rectangular coordinate. We found the fact that the ranges of the natural frequencies of a feeding deck and an actuator are close to each other. And the time responses are also computed by the Newmark method and Runge-Kutta method.

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Dynamic Characteristics of an Optical Pick-up Actuator Considering the Motion of a Feeding Deck (피딩데크 운동을 고려한 광픽업 액츄에이터의 동특성 해석)

  • Kapsoo Shin;Jintai Chung;Kim, Wonsuk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.316.2-316
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    • 2002
  • There are a lot of roots of errors in the motion of the optical pickup actuator being one of the most significant components in the CD-ROM drive. Most of the studies recently performed have a tendency to seek fur the causes from an actuator itself. We found the fact that the range of the natural frequencies of a feeding deck and an actuator is close each other through an experiment. This paper present the dynamic characteristics of an actuator affected by the motion of a feeding deck. (omitted)

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