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http://dx.doi.org/10.5762/KAIS.2013.14.5.2092

Critical-speed Increase of Optical Disk by Applying Residual Stresses  

Kim, Nam Woong (School of Mechanical Engineering, Dongyang Mirae University)
Na, Sang Sik (Samsung Electronics Co., Ltd.)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.14, no.5, 2013 , pp. 2092-2099 More about this Journal
Abstract
Through the data transfer race in industry since 1990s, the operational speed of optical disk drive(ODD) becomes commonly over 10,000 rpm. Such high speed operation inevitably causes the vibration, which is also the disturbances in the read-write process of pick-up servo-controller. Generally the vibration disturbance problem can be solved by the vibration isolation using the rubber mount and the increase of robustness of the pick-up servo-controller. Optical disk itself has not been targeted for the vibration reduction, because it is manufactured under the standardized format. In this paper we focused on the increase of critical speed of optical disk, that is, the improvement of dynamic characteristics, with the control of residual stresses which are come from the injection molding process. To do this, first, the residual stresses induced from the injection molding process are calculated using finite element method. The major design parameters of the process conditions are flow rate and melt temperature, which control the residual stresses in optical disk. Second, the critical speed of optical disk is calculated with modal analysis considering residual stress distributions. It was found out that the critical speed can be improved by the control of operational parameters in the injection molding process.
Keywords
Optical disk; Optical disk drive; Residual stress; Critical speed; Injection molding;
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Times Cited By KSCI : 2  (Citation Analysis)
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