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서정교(Jeong-Kyo Seo),조순철(Soon-Chul Jo),김용수(Young-Su Kim),박노열(No-Youl Park) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.2
Off-track capability is used to determine the track pitch of hard disk drive system, and the off-track capability as a function of track pitch is called 747 curve. In this paper, 747 curves were simulated with computer. Side reading and recording parameters were obtained by magnetic field analysis using 3-D finite element method. Head read signal and noise voltages for calculation of signal to noise ratio (SNR) were obtained using reciprocity theorem. According to the 747 curves thus obtained, the off-track capability was increased as erase band width increased and as effective signal to noise ratio (SNReff) decreased. A simulated 747 curve and a measured 747 curve (using spin stand) of a planar silicon head with track width of 4.1 ㎛ were very similar, which indicated that the simulation was carried out properly.
이정욱 ( Jeong Uk Lee ),서정교 ( Jeong Kyo Seo ),신윤섭 ( Yun Sup Shin ),박진무 ( Jin Moo Park ),정미현 ( Mi Hyeon Jeong ),최인호 ( In Ho Choi ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
Near field recording (NFR) technology with SIL has been thought as the most promising generation optical storage device. A gap distance between the SIL and the disc should be controlled to be 20~40nm. We observed gap error signal in our NFR test-bed using a blue LD (405nm). The digital gap servo filter and control algorithm were developed to maintain a constant air gap by adopting a conventional actuator.
신윤섭 ( Yun Sup Shin ),박진무 ( Jin Moo Park ),이정욱 ( Jeong Uk Lee ),정미현 ( Mi Hyun Jeong ),서정교 ( Jeong Kyo Seo ),최인호 ( In Ho Choi ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
Air gap control method using a conventional actuator for near field recording technology has been reported. Toachieve good performance in the air gap servo and further experiments, the assembling between OL and SIL is the critical procedure. A lens set with NA 1.45 at 405 nm has been assembled and tested by using a Twyman-Green interferometer. The tolerance of assembling is very tight and the designing and adjusting adjusting procedure must be carefully controlled.