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DVD-RAM 기판의 복굴절, Radial-Tilt 및 전사성 향상을 위한 사출압축성형공정 최적화
강신일,성기병,이남석,Gang, Sin-Il,Seong, Gi-Byeong,Lee, Nam-Seok 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
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
강신일,김영민,성기병,이준석,이승원,Gang, Sin-Il,Kim, Yeong-Min,Seong, Gi-Byeong,Lee, Jun-Seok,Lee, Seung-Won 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
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.