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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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 languageEnglish
Pages (from-to)3997-4002
Number of pages6
JournalJapanese Journal of Applied Physics
Issue number6 B
Publication statusPublished - 2007 Jun 22

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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