• Title/Summary/Keyword: Optical recording system

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Optimal design of slider for stable flying characteristic using 4${\times}$l near-field probe array

  • Jung Min-su;Hong Eo-Jin;Park Kyoung-Su;Park No-Cheol;Yang Hyun-Seok;Park Young-Pil;Lee Sung-Q;Park Kang-Ho
    • 정보저장시스템학회:학술대회논문집
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    • 2005.10a
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    • pp.171-176
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    • 2005
  • In the information storage development, the trend of the storage device is to increase the recording density. Among such an effort, near-field probe recording is spotlighted as a method of high increasing recording density. For the successfully embodiment of storage device, the actuating mechanism of near-field probe is essentially designed. In this paper, we suggest the slider similar with conventional HDDs and design the slider using near- field probe for the purpose of applying the slider in order to control gap between probe and media. The most important object of slider design is to guarantee the flying ability and stability. For achievement of these design objects, we perform two step of optimal design process. The media is mod! eled as random displacement, which is only considered roughness of disk surface. The design slider is analyzed with dynamic state in assumed media. At this process, the optimal model is confirmed to stable flying stability.

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Optimal Design of Slider for Stable Flying Characteristics using $4{\times}1$ Near-field Probe Array

  • Jung, Min-Su;Hong, Eo-Jin;Park, Kyoung-Su;Park, No-Cheol;Yang, Hyun-Seok;Park, Young-Pil;Lee, Sung-Q;Park, Kang-Ho
    • Transactions of the Society of Information Storage Systems
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    • v.2 no.1
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    • pp.65-70
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    • 2006
  • In the information storage development, the trend of the storage device is to increase the recording density. Among such an effort, near-field probe recording is spotlighted as a method of high increasing recording density. For the successfully embodiment of storage device, the actuating mechanism of near-field probe is essentially designed. In this paper, we suggest the slider similar with conventional HDD and design the slider using near-field probe for the purpose of applying the slider in order to control gap between probe and media. The most important object of slider design is to guarantee the flying ability and stability. For achievement of these design objects, we perform two step of optimal design process. The media is supposed to model as random displacement, which is only considered roughness of disk surface. The design slider is analyzed with dynamic state in assumed media. At this process, the optimal model is confirmed to stable flying stability.

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Optical system design for stereoscopic video-recorder (비디오 입체영상녹화를 위한 광학계 설계)

  • Hong, Kyung-Hee
    • Korean Journal of Optics and Photonics
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    • v.13 no.6
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    • pp.506-509
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    • 2002
  • An optical system for a stereoscopic video recorder is designed with the field of view 42$^{\circ}$ and effective diameter 22 mm. We can use it by attaching it to the front lens of any video camera or camcorder to record a stereoscopic scene. This system is a double Kepler type afocal system to make the image erect and a bi-ocular type to record and display the stereoscopic scene. The optical tube length is folded with several flat mirrors and a beam splitter to be compact. This optical system is composed of 4 groups of lenses and each group serves as a relay lens for minimizing the vignetting effect. Whole field stereoscopic scenes may be captured by perpendicularly polarized alternated recording with a chopper and two perpendicular polarizers, without any loss of light energy. The displayed images may be seen stereoscopically with polarized spectacles and are kinetic because of an afterimage effect.

Dynamic Characteristic Analysis and Position Control for High Density Optical Head Using Bimorph PZT (고밀도 광학헤드를 위한 Bimorph 압전 액추에이터의 동특성 해석 및 위치제어)

  • Park, Tae-Wook;Park, No-Cheol;Yang, Hyun-Seok;Park, Young-Pil;Kwon, Young-Ki
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.1 s.94
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    • pp.12-19
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    • 2005
  • This paper proposed a dual actuator using Bimorph PZT for information storage device based on prove array NSOM(near-field scanning optical microscopy). The gap between the media and the optical head should be maintained within the optical tolerance. Therefore, a new actuator having high sensitivity is required. Bimorph PZT, which has fast access time and high sensitivity characteristic, is suitable for this precise actuating system. This paper is focused on derivation of mathematical model of dual Bimorph PZT actuator and control algorithm. Hamilton's principle was used for mathematical model. The model is verified by FEA(finite element analysis), and compared with experimental results. Different control algorithms were used for two Bimorph PZT actuating same direction and opposite direction. The gap between recording media and optical head was controlled within 20nm in experiment.

Implementation of Multiview Stereoscopic 3D Display System using Volume Holographic Lenticular Sheet (VHLS 광학판 기반의 다시점 스테레오스코픽 3D 디스플레이 시스템의 구현)

  • 이상우;이맹호;김은수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.5C
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    • pp.716-725
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    • 2004
  • In this paper, a new multiview stereoscopic 3D display system using a VHLS(volume holographic lenticular sheet) is suggested. The VHLS, which acts just like an optical direction modulator, can be implemented by recording the diffraction gratings corresponding each directional vector of the multiview stereoscopic images in the holographic recording material by using the angularly multiplexed recording property of the conventional volume hologram. Then, this fabricated VHLS is attached to the panel of a LCD spatial light modulator and used to diffract each of the multiview image loaded in a SLM to the corresponding spatial direction for making a 3D stereo view-zone. Accordingly, in this paper, the operational principle and characteristics of the VHLS are analyzed and an optimized 4-view VHLS is fabricated by using a commercial photopolymer. Then, a new VHLS-based 4-view stereoscopic 3D display system is implemented. Through some experimental results using a 4-view image synthesized with adaptive disparity estimation algorithm, it is suggested that implementation of a new VHLS-based multiview stereoscopic 3D display system can be possible.

The Partial Response Signals for Optical Recording System (광 기록 시스템을 위한 부분 응답 신호)

  • 이주현;이재진
    • Proceedings of the IEEK Conference
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    • 2000.09a
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    • pp.975-978
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    • 2000
  • 본 논문에서는 고밀도 광 기록 시스템에서 코드율이 2/3인 (1,7) 코드를 사용하여 부분 응답의 목표를 다양하게 변화시켜 여러 가지 목표 응답에 대해 잡음의 대부분을 차지하는 지터(jitter) 성분만을 고려했을 때와 이에 부가적인 백색잡음(AWGN)만을 고려하였을 경우의 성능을 각각 비교, 분석하였다. 또한, 이 실험 결과를 토대로 고밀도 광 기록 채널에 적용시킬 수 있는 가능한 부분 응답들을 조사하였고, 그 결과 PR(6,6,8,4,3) ML 코드가 고밀도 기록 시스템에서 좋은 데이터 검출 능력을 나타냄을 보였다.

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VHDL Implementation of New Modulation Code for High Density Optical Recording System (고밀도 광 기록 시스템을 위한 새로운 변조 코드에 대한 VHDL 구현)

  • 권인수;이주현;이재진
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.10B
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    • pp.1458-1463
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    • 2001
  • 본 논문에서는 고밀도 광 기록 시스템에 적용이 가능한 코드율이 8/15이고, (d, $textsc{k}$)=(2, 15)인 새로운 변조 코드 체계에 대한 변조 코딩 방법을 VHDL로 구현하였다. 인코딩 방법은 크게 세 가지로 구분되어 진다. 먼저 입력 데이터를 복수개의 바이트 단위로 묶어서 블록을 정의하고, 이 블록의 입력 데이터를 변환 테이블을 이용해서 채널 데이터로 변환한 후, 머징 비트(merging bits)를 첨가하여 데이터를 전송한다. 위와 같은 코딩 방법을 적용하여 새롭게 개발한 변조 코드에 대해 모의 실험을 통한 성능을 분석한 후 VHDL로 구현하여 검증하였다.

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Design and Fabrication of Holographic Head-up Display System (홀로그래피 Head-up display 시스템의 설계 및 제작)

  • 정만호;송재봉;한영수;유연석
    • Korean Journal of Optics and Photonics
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    • v.5 no.2
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    • pp.225-230
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    • 1994
  • Main parameters and equations necessary for developing the holographic HUD are investigated. Air reflection recording method of obtaining good holographic reflection filters with minimized interference pattern noises is presented. Especially, a new method of correcting the center wavelength shift which takes place after the processing of the DCG film is suggested.gested.

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The diffraction property of the bessel beam for defocus (Defous에 따른 bessel beam의 회절 특성)

  • 박성종;최기준;박민경;김재범;심상현;정창섭
    • Korean Journal of Optics and Photonics
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    • v.6 no.2
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    • pp.101-107
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    • 1995
  • To investigate the diffraction property of the Bessel beam for defocus which acts CFAP (Combined Filter of Amplitude and Phase), we calculated numerically the intensity, the radius of central spot, and the optical transfer function for the number of node of the Bessel beam when an optical system has an aberration-free or a spherical aberration. The Bessel beam has larger the maximum intensity and the OTF value for an optical system with a spherical aberration than that with an aberrationfree. Particularly, the OTF value at the point of maximum intensity for $W_{40}=3\lambda$is higher for the Bessel beam than for the Clear aperture. From these results, we know that the Bessel beam has the compensating effect. The Bessel beam also has the radius of central spot having a superresolution. We will useful for the fabrication of semiconductor device and the optical recording system using these effects.ffects.

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Stiffness Analysis of Compressed Rubber Components for Anti-Vibration (압축된 방진고무의 강성 해석)

  • Kim, Kug-Weon;Lim, Jong-Rak;Ahn, Tae-Kil
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.6
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    • pp.141-147
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    • 1999
  • Optical disk technology with a laser beam for data recording and retrieval is one of the most promising route for high density information storage in multimedia era. As the storage density and data transfer rates are increased, mechanical issues, mainly noise and vibration, become critical. Rubber materials are extensively used in various machine design application, mainly for vibration/shock/noise control devices. Over the years an enormous effort has been put into developing procedures to provide properties of rubber components with complex shape and under pre-deformed state. In this paper, non-linear large deformations of a rubber mount for optical disk drive were investigated using the finite element method. A tension test of rubber material was performed, to calculate a strain energy function. According to the pre-deformed state, the variation of rubber mount stiffness were calculated and the reliability of numerical results were checked by compared with the measuring the deflection values. Also, the effects of the pre-deformed rubber mount on the system dynamic characteristics were investigated and the relation between the static stiffness variation of rubber mount and the natural frequence variation of system was discussed.

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