• 제목/요약/키워드: Optical-Lever

검색결과 17건 처리시간 0.03초

차세대 광디스크용 레버 구동기의 설계 (Design of lever actuator for the next generation optical disk)

  • 한찬수;김수현
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.397-400
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    • 2000
  • The demands of high data transfer rate and high recording density in optical disk memory device are being increased. In order to achieve high performance, lever actuator for optical disk is proposed. Firstly, the role of lever and structure are discussed and the flexure hinge is introduced to enhance the precise movement. Next is to present the magnetic circuit structure and concept design for the lever actuator. Finally, the dynamic modeling of the lever actuator is found and the analysis results are shown. Consequently, the lever actuator shows the possibility as a pickup actuator for the next generation optical disk.

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광 픽업용 레버 구동기의 해석 (Analysis of lever actuator for the optical disk)

  • 한창수;김수현
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.618-621
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    • 2001
  • The proposed lever actuator has no friction and mass balance characteristics in motion, which are adapt to high-speed and high-density optical disk system. This paper discussed about the theoretical analysis of the lever structure. The modeling of the lever actuator is found. Using the Newton's method, the motion of equation is deduced through the constraint equations and equilibrium equations in three directions (focusing, tracking and tilting). From the above analysis, we know that the shape of the hinge is the very important parameter on determining the performance of the lever actuator, and the actuator has the 2nd order system characteristics. And the first resonant frequency in transmissibility is dependent to the rigidity of the lever while the first transmissibility resonance of conventional actuators is dependent to the first natural resonance of those actuators. This means that the lever actuator is more stable to the external vibration.

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광디스크 픽업용 3축 레버 구동기의 설계 및 해석 (Design and Analysis of a Lever actuator for the Optical Disk Pickup)

  • 한창수;김수현
    • 한국정밀공학회지
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    • 제19권9호
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    • pp.41-50
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    • 2002
  • Optical disk system aiming at fast data transfer rate and high-density recording requires the improvement in performance of the pickup head. Especially, the pickup actuator needs better linearity and stability. So, a lever actuator for optical disk is proposed. In this paper, the role of lever and its structure are discussed and the flexure hinge is introduced to enhance the precise movement. Using the Newoton's method, the motion of equation for the lever actuator is obtained. The results are compared with the analysis results by the FEM (Finite Element Method) for the vibration and the magnetic field. Consequently, the lever actuator has the 2"d system characteristics in 3-axis moving directions and superior stability for the external vibration.tion.

Amplitude Modulation Response and Linearity Improvement of Directly Modulated Lasers Using Ultra-Strong Injection-Locked Gain-Lever Distributed Bragg Reflector Lasers

  • Sung, Hyuk-Kee;Wu, Ming C
    • Journal of the Optical Society of Korea
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    • 제12권4호
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    • pp.303-308
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    • 2008
  • Directly modulated fiber-optic links generally suffer higher link loss and larger signal distortion than externally modulated links. These result from the electron-photon conversion loss and laser modulation dynamics. As a method to overcome the drawbacks, we have experimentally demonstrated the RF performance of directly modulated, ultra-strong injection-locked gain-lever distributed Bragg reflector (DBR) lasers. The free-running DBR lasers exhibit an improved amplitude modulation efficiency of 12.4 dB under gain-lever modulation at the expense of linearity. By combining gain-lever modulation with ultra-strong optical injection locking, we can gain the benefits of both improved modulation efficiency from the gain-lever effect, plus improved linearity from injection locking. Using an injection ratio of R=11 dB, a 23.4-dB improvement in amplitude response and an 18-dB improvement in spurious-free dynamic range have been achieved.

마이크로 캔틸레버 굽힘 측정을 위한 센싱시스템 (Sensing System for Measuring Deflection of Microcantilever)

  • 김현철;이상헌
    • 대한기계학회논문집B
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    • 제36권9호
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    • pp.961-964
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    • 2012
  • 원자현미경에서 시편의 높이정보를 얻기 위한 마이크로 캔틸레버의 굽힘은 optical lever 방식이나 간섭원리에 기반한 방식으로 이루어졌으나, 부피와 가격적인 측면에서 이들 방식은 많은 개선의 여지를 가지고 있다. 따라서 본 논문에서는 이전 방식의 단점을 극복하기 위하여, 간단한 구조로 구현이 가능한 비점 수차방식을 기반으로한 광픽업헤드를 이용하여 마이크로 캔틸레버의 굽힘 측정시스템을 개발하였다. 개발된 시스템은 실험실에서 제작한 원자현미경에 적용하여 그 가능성을 확인하였다.

정전기력으로 구동되는 마이크로 캔틸레버 질량 센서의 제작과 특성 (Fabrication and Characterization of Electrostatically Actuated Microcantilever Mass Sensors)

  • 이정철;최범규
    • 센서학회지
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    • 제20권1호
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    • pp.40-45
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    • 2011
  • Microcantilevers have been actively used in probe-based microscopy and gravimetric sensing for biological or chemical analytes. To integrate actuation or detection schemes in the structure, typical fabrication processes include several photolithographic steps along with conventional MEMS fabrication. In this paper, a simple and straightforward way to fabricate and operate silicon microcantilever mass sensors is presented. The fabricated microcantilever sensors which can be electrostatically actuated require only two photolithographic steps. Resonant characteristics of fabricated microcantilevers are measured with a custom optical-lever and results show size-dependent quality factors. Using a $40\;{\mu}m$ long, $7\;{\mu}m$ wide, and $3\;{\mu}m$ thick cantilever, we achieved subfemtogram mass resolution in a 1 Hz bandwidth.

자동변속기장착 차량의 Shift-By-Wire 시스템 개발 (Development of Shift-By-Wire System for an Automatic Transmission Equipped Vehicle)

  • 김정윤;임충혁;임원식
    • 한국자동차공학회논문집
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    • 제15권4호
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    • pp.41-46
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    • 2007
  • This article deals with the design and prototyping of Shift-By-Wire system for an automatic transmission equipped vehicle. In order to manipulate the shifting action electronically, Shift-By-Wire system consists of an electronic shift lever, an electric shift actuator and position sensors. The shift lever is designed to transform the driver's shifting command into an electric signal; it includes the position sensor using non-contact type hall sensor and an additional shifting switch acting as Tip-tronic. For the design of an electric shifting actuator, we investigated the stroke angles and shifting efforts of the manual control lever in each shifting section. And the position sensor of the shifting actuator is designed by using a potentiometer with an optical encoder. Finally the prototype of Shift-By-Wire system was built in a conventional 2.4L class SUV vehicle, and we performed road tests in order to verify its performance.

5G 모바일 액세스용 광 부품 기술 동향 (Technical and Industrial Trends of Optical Components for 5G Mobile Access)

  • 권오균;김남제;박미란;김태수;안신모
    • 전자통신동향분석
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    • 제35권4호
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    • pp.42-52
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    • 2020
  • The world's first 5G commercial service started in Korea in April 2019. This makes us proud of our status as an ICT powerhouse, and of the domestic optical network industry ecosystem that has served as a lever to make this significant leap forward in technological and industrial competitiveness. Above all, Japan's trade regulations on core parts and the COVID-19 pandemic have led to new changes across cultures, societies, and economies, and 5G networks have become important. The relevant technology for core material parts is a major concern not only of a few industries, but an entire section of society in terms of national competitiveness. In this article, we discuss the role of industries through the analysis of prospects of optical component technology with regard to the changes in the economic and social paradigm caused by the COVID-19 pandemic and Japan's export regulations.

Quantum Dot Optoelectronic Devices

  • P., Lever;K., Stewart;Q., Gao;L., Fu;J., Wong-Leung;M., Buda;H.H., Tan;C., Jagadish
    • 한국광학회:학술대회논문집
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    • 한국광학회 2004년도 하계학술발표회
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    • pp.4-5
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    • 2004
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초정밀 자유곡면 가공용 long stroke fast tool servo의 설계 및 특성 평가 (Design and Testing of a Long Stroke Fast Tool Servo for Ultra-precision Free-form Machining)

  • 김호상;이광일
    • 한국정밀공학회지
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    • 제26권2호
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    • pp.35-44
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    • 2009
  • Long stroke Fast Tool Servo (LFTS) with maximum stroke of $432{\mu}m$ is designed, manufactured and tested for fabrication of optical free-form surfaces. The large amount of stroke in LFTS has been realized by utilizing the hinge and lever mechanisms which enable the displacement amplification ratio of 4.3. In this mechanism the peculiar shape was devised for maximizing the displacement of end tip in LFTS and special mechanical spring has been mounted to provide the sufficient preload to the piezoelectric actuator. Also, its longitudinal motion of tool tip can be measured by capacitive type displacement sensor and closed-loop controlled to overcome the nonlinear hysteresis. In order to verify the static and dynamic characteristics of designed LFTS, several features including step response, frequency response and cut-off frequency in closed-loop mode were experimentally examined. Also, basic machining result shows that the proposed LFTS is capable of generating the optical free-form surface as an additional axis in diamond turning machine.