• Title/Summary/Keyword: Optical Storage

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Theoretical and Numerical Lens Design Using Near Field Theory for High Density Storage Device (근접장 이론을 이용한 고밀도 저장 장치용 렌즈의 이론적 설계와 수치적 설계)

  • 이문도;박재혁;박노철;박영필
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.9
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    • pp.173-179
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    • 2003

  • In optical storage device system, there are several research topics to increase its recording density. The main idea is reducing wave length of laser diode and magnifying the number of numerical aperture (NA). In conventional optical system NA cannot be over the unity in the air because of its diffraction limit. But it is possible to overcome its limitation of unity in near field using Solid Immersion Lens. In this work, the mathematical Solid Immersion Lens (SIL) design process was illustrated by using near field theory. Also, numerical SIL design parameters were calculated by means of CODE V. Through the work, we propose the new type of SIL for high density optical recording systems.

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Optimum SIL System Design with High NA and Large Tolerance

  • Won, Ki-Tak;Choi, Na-Rak;Kim, Jai-Soon;Lee, Ji-Yeon;Lee, Kyung-Eon;Shin, Yun-Sup
    • Proceedings of the Optical Society of Korea Conference
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    • 2007.02a
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    • pp.277-278
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    • 2007

  • Even though high NA, Hyper SIL system easily decline the optical performance even a little alignment error. Not only to overcome this instability but to maintain the high NA gain, we suggest a new system (Optimum SIL) which is a combination of each advantage of Hyper SIL and Hemi SIL. Simulation results shows that Optimum SIL system has much higher tolerance to various performance-lowering factors than Hyper SIL system even with a relatively small NA resignation.

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Shock Response Analysis of Small Form Factor Optical Disk Drive using Finite Element Method (유한 요소법을 이용한 초소형 광디스크 드라이브의 충격해석)

  • 김시정;장영배;박노철;박영필
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.173-176
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    • 2004

  • Nowadays, mobile devices are very common equipments such as mobile phone, PDA, etc. These equipments need information storage devices. Optical storage devices have more advantages than other storage devices, but it is not free from shock situation like dropping by user's mistakes. A complete model of a Small Form Factor Optical(SFFO) disk drive subject to shock loads is developed to investigate the response of the pickup/disk interface. With this model, we can simulate the drop test and consider the matters of shock simulation using commercial software(Ansys/LS-Dyna).

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