Design and control of dual servo actuator for near field optical recording system

Jaehwa Jeong; Young-Man Choi; Jun-Hee Lee; Hyoung-Kil Yoon; Dae-Gab Gweon

doi:10.1117/12.648697

5 December 2005 Design and control of dual servo actuator for near field optical recording system

Jaehwa Jeong, Young-Man Choi, Jun-Hee Lee, Hyoung-Kil Yoon, Dae-Gab Gweon

Proceedings Volume 6048, Optomechatronic Actuators and Manipulation; 60480M (2005) https://doi.org/10.1117/12.648697
Event: Optomechatronic Technologies 2005, 2005, Sapporo, Japan

Abstract

Near field recording (NFR) has been introduced as a new optical data storage method to realize higher data density beyond the diffraction limit. As the data density increases, the track pitch is remarkably reduced to about 400nm. Thus, more precise actuator is required and we propose a dual servo actuator to improve the accuracy of actuator. The proposed dual servo actuator consists of a coarse actuator and a fine actuator, multisegmented magnet array (MSMA) voice coil motor (VCM) and PMN-PT actuator. In design of VCM actuator, a novel magnetic circuit of VCM with MSMA is proposed. It can generate higher air gap flux density than the magnetic circuit of VCM with the conventional magnet array. In design of fine actuator, the fine actuator including PMN-PT single crystal instead of the conventional PZT is proposed. The displacement gain of PMN-PT fine actuator is 26 nm/V and that of PZT fine actuator is 17 nm/V. The displacement gain is increased by 53 %. To evaluate tracking performance of the manufactured dual servo actuator and to assign the proper role to each actuator, the PQ method is selected. From experiment results, the total bandwidth of the dual servo actuator is increased to 2.5kHz and the resolution is 25 nm. Comparing with the resolution of one servo actuator, 70 nm, we can find that the accuracy of actuator is remarkably improved. And the proposed dual servo actuator shows satisfactory performances to be applied to NFR and it can be applied to other future disk drives.

Citation Download Citation

Jaehwa Jeong, Young-Man Choi, Jun-Hee Lee, Hyoung-Kil Yoon, and Dae-Gab Gweon "Design and control of dual servo actuator for near field optical recording system", Proc. SPIE 6048, Optomechatronic Actuators and Manipulation, 60480M (5 December 2005); https://doi.org/10.1117/12.648697

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KEYWORDS

Actuators

Servomechanisms

Ferroelectric materials

Near field

Control systems

Magnetism

Manufacturing

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