Jpn. J. Appl. Phys. 46 (2007) pp. 3997-4002  |Previous Article| |Next Article|  |Table of Contents|
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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, and Hyunseok Yang

(Received November 20, 2006; accepted January 23, 2007; published online June 22, 2007)

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.

URL: http://jjap.jsap.jp/link?JJAP/46/3997/
DOI: 10.1143/JJAP.46.3997
KEYWORDS:near-field recording, solid immersion lens, external shock, safety mode, protector

References | Citing Articles (3)

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