Analysis on effect of external shock in near-field recording system

Yong Joong Yoon; Sang Hoon Kim; Woong Seol; Joong Gon Kim; No Cheol Park; Hyunseok Yang

doi:10.1143/JJAP.46.3997

Analysis on effect of external shock in near-field recording system

Yong Joong Yoon, Sang Hoon Kim, Woong Seol, Joong Gon Kim, No Cheol Park, Hyunseok Yang

Department of Mechanical Engineering

Research output: Contribution to journal › Article

6 Citations (Scopus)

Abstract

In this research, we confirm that a near-field recording (NFR) system, particularly a solid immersion lens-based NFR system, is so weak to the slightest external shock that we should solve this problem to realize NFR technology for a real product. For this, we first define the disturbances caused by the external shock as the displacement of a disc and an actuator. We modify a general NFR servo system to deal with these disturbances by applying a safety mode to a switch mode, which is one of the servo systems in general NFR. To protect a disc from a collision between the actuator and the disc, we add a protector to the cover of the actuator and show that the NFR system with the applied safety mode can avoid the collision between a SIL and the disc for a severe external shock, such as the amount of 240 G based on the results of simulations.

Original language	English
Pages (from-to)	3997-4002
Number of pages	6
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	46
Issue number	6 B
DOIs	https://doi.org/10.1143/JJAP.46.3997
Publication status	Published - 2007 Jun 22

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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10.1143/JJAP.46.3997

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Yoon, Y. J., Kim, S. H., Seol, W., Kim, J. G., Park, N. C., & Yang, H. (2007). Analysis on effect of external shock in near-field recording system. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 46(6 B), 3997-4002. https://doi.org/10.1143/JJAP.46.3997

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abstract = "In this research, we confirm that a near-field recording (NFR) system, particularly a solid immersion lens-based NFR system, is so weak to the slightest external shock that we should solve this problem to realize NFR technology for a real product. For this, we first define the disturbances caused by the external shock as the displacement of a disc and an actuator. We modify a general NFR servo system to deal with these disturbances by applying a safety mode to a switch mode, which is one of the servo systems in general NFR. To protect a disc from a collision between the actuator and the disc, we add a protector to the cover of the actuator and show that the NFR system with the applied safety mode can avoid the collision between a SIL and the disc for a severe external shock, such as the amount of 240 G based on the results of simulations.",

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