• 제목/요약/키워드: DVD-RAM Substrate

검색결과 6건 처리시간 0.018초

DVD-RAM 기판의 복굴절, Radial-tilt 및 전사성 향상을 위한 사출압축성형공정 최적화 (An Optimum Design of Replication Process to Improve Birefringence, Radial-tilt and Land-Groove Structure in DVD-RAM Substrates)

  • 이남석;성기병;강신일
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집C
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    • pp.438-444
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    • 2001
  • The objective of this study is to provide a simple methodology to find optimum processing conditions to fabricate sub-micron structured DVD-RAM substrates with superb optical and geometrical properties. It was found that the birefringence, which is regarded as one of the most important optical properties for an optical disk, was very sensitive to the mold wall temperature history. Also, the integrity of the replication, represented by the land-groove structure and the radial tilt were influenced by the mold temperature and the compression pressure. A set of optimum conditions were obtained by applying Design of Experiment and the objective functions composed of three different objectives.

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미세 형상을 갖는 DVD-RAM 기판의 성형에 관한 연구 (Fabrication of the Micro-structured DVD-RAM Substrates)

  • 문수동
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2000년도 춘계학술대회논문집
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    • pp.167-170
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    • 2000
  • Recently the sub-micron structured substrates of 0.74 ${mu}ell$ track pitch and 800 $\AA$groove depth are required for DVD-RAM and the track pitch is expected to be narrower as the need for the information storage density is getting higher. For the accurate replication of the land-groove structure in the stamper to the plastic substrates it is important to control the injection -compression molding process such that the integrity of the replication for the land-groove structure is maximized. in the present study polycarbonate substrates were fabricated by injection comression molding and the land-groove structure regarded as one of mold temperature and the compression pressure on the integrity of the replication were examined experimentally. An efficient design methodology using the response surface method (RSM) the central composite design(CCD) technique and the analysis-of-variance (ANOVA) was developed to obtain the optimum processing conditions which maximize the integrity of the replication with a limited number of experiments.

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DVD-RAM 기판의 복굴절, Radial-Tilt 및 전사성 향상을 위한 사출압축성형공정 최적화 (An Optimum Design of Replication Process to Improve Birefringence, Radial-Tilt and Land-Groove Structure in DVD-RAM Substrates)

  • 강신일;성기병;이남석
    • 대한기계학회논문집A
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    • 제26권4호
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    • pp.637-643
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    • 2002
  • The objective of this study is to provide a simple methodology to find optimum processing conditions to fabricate sub-micron structured DVD-RAM substrates with superb optical and geometrical properties. It was fecund that the birefringence, which is regarded as one of the most important optical properties for an optical disk, was very sensitive to the mold wall temperature history. Also, the integrity of the replication, represented by the land-groove structure and the radial tilt were influenced by the mold temperature and the compression pressure. A set of optimum conditions were obtained by applying Design of Experiment and the objective functions composed of three different objectives.

단열층이 DVD 기판의 복굴절 및 전사성에 미치는 영향 (Effect of Insulation Layer on Birefringence and Land-groove Pattern in DVD-RAM Substrate)

  • 김영민;성기병;강신일
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집C
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    • pp.432-437
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    • 2001
  • It is necessary to improve mechanical and optical porperties in the optical disk substrates as the information storage devices with high storage density using blue laser are being developed. Injection compression molding is regarded as the most suitable process to manufacture optical disk substrates for quality recording and read-out. In the present research, the effects of processing conditions and the insulation layer thickness on gapwise birefringence and the land-groove pattern were investigated. It was found that the values of the birefringence distribution were very sensitive to mold temperature history, and the level of birefringence reduced and, furthermore, the quality of replication was improved due to the insulation layer.

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데이터 저장용 디스크의 회전 시 입자이탈에 관한 실험적 연구 (An Investigation of Particle Detachment Ratios From Rotating Data Storage Disks)

  • 박희성;이대영;황정호;김광;장동섭
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.585-588
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    • 2001
  • Particle contamination on the data storage disks has been a serious problem for magnetic hard disk drive manufacturers. For high storage optical disks, such as DVD-ROM/RAM or NFR (near field recording) system, particle-induced damages can be also detected because only a few micrometer particles can prevent read/write signal from optical lens. The increasing areal density and smaller bit size accelerates particle induced damages on the optical disk. One of the methods to prevent particle contamination on the optical disk surface is to handle the disk enclosed in a cartridge like a modern DVD-RAM disk. However, even for a perfectly sealed disk drive, particles are found inside the drive. The other method is to improve disk surface characteristics. Particle contamination on the surface can be reduced by proper selection of disk coating materials. [n this paper, particle detachment ratios for CD (compact disk), DVD (digital versatile disk), HD (magnetic hard disk), HD with Jut lubricant, and aluminosilicate substrate HD were investigated. Surface roughness and surface energy of the test disks were compared with the particle detachment ratios. Proper substrate and lubricant characteristics to reduce particle contamination on the disk surface were found.

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단열층이 DVD 기판의 복굴절 및 전사성에 미치는 영향 (Effect of Insulation Layer on Birefringence and Land-groove Pattern in DVD-RAM Substrate)

  • 강신일;김영민;성기병;이준석;이승원
    • 대한기계학회논문집A
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    • 제26권4호
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    • pp.631-636
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    • 2002
  • It is necessary to improve mechanical and optical properties in the optical disk substrates as the information storage devices with high storage density using blue laser are being developed. Injection compression molding is regarded as the most suitable process to manufacture optical disk substrates for quality recording and read-out. In the present research, the effects of mold temperature and the insulation layer thickness on gapwise birefringence and the land-groove pattern were investigated. It was found that the values of the birefringence distribution were very sensitive to mold temperature history, and the level of birefringence reduced and, furthermore, the quality of replication was improved due to the insulation layer.