Abstract
A data transfer rate higher than 300 Mbps and large-capacity optical recording media are needed for recording Super Hi-Vision signals in next-generation broadcasting. A near-field optical recording (NFR) system using the solid immersion lens (SIL) 1) is expected for next-generation optical recording media. The NFR system has four times higher recording density than the blu-lay disk system and realized large capacity2), 3). However, the data transfer rate cannot not reach that of the blu-lay disk system because the gap length (GL) between the optical head and the disk must be below 100 nm (λ/4, λ: laser wave length), which enables evanescent coupling. It is difficult to keep a short GL and to perform the gap servo for the rotational disk that has large axial run-out disturbance at high speed. Precise gap servo technology must be developed to achieve the high-data-transfer-rate recording. Some papers have reported precise gap servo control on the high density media with a track pitch of 0.16 µm at 3600 rpm4), 5), and reported the feasibility for high-speed gap servo at 5000 rpm by using a flexible disk6). A repetitive control method is applied to these gap servos. We have proposed a high-speed ZPET-FF control method7) that is more precise and faster than the repetitive control. Another paper also reported a compensating method for tracking error components8). This paper proposes a new high-speed and precise gap servo control system based on our proposed FF control method that can suppress the disturbance fitted for the behavior of axial run-out of the rotational disk. The proposed method can perform the precise gap servo on the NFR system using the 100 GB optical disk at 11000 rpm.
© 2011 Optical Society of America
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