Servo control system construction for CBHD radial and axial tracking

Yingchao Cui; Xuemin Cheng; Jianshe Ma; Xinnan Hou

doi:10.1117/12.870512

2 December 2010 Servo control system construction for CBHD radial and axial tracking

Yingchao Cui, Xuemin Cheng, Jianshe Ma, Xinnan Hou

Proceedings Volume 7851, Information Optics and Optical Data Storage; 78510H (2010) https://doi.org/10.1117/12.870512
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

CBHD (China Blue High Definition Disc) is a high-definition optical disc standard with Chinese independent intellectual property. Compared with DVD optical pick-up, CBHD optical pick-up, key component of CBHD player, has significant improvement in the channel bit rate and certain reduction in acceptable tolerance range for disk tilt, etc. This paper specifies the servo control system construction for the CBHD radial tracing and axial tracking. This servo control system should ensure the optical beam of OPU focusing on the Disc plane and following the track of CBHD channel accurately. According to the expected radial/axial maximum acceleration and the limitation of emax, an open-loop transfer function specifying the servo system for axial and radial tracking is introduced. The corresponding servo control algorithm including IIR filter based on the above-mentioned transfer function is theoretically analyzed and numerically simulated by MATLAB. Because optical pick-ups are different in dynamic properties and its digital circuit exist quantization error, time delay nonlinearity, etc, the tuning of IIR parameters is laborious and time-consuming. Thus a experimental platform for CBHD optical pick-up servo system are designed in this paper, and an user-friendly interface for IIR parameters adjustment is given. Experimental results showed that this control system has good servo characteristics in time-domain and frequency-domain.

Citation Download Citation

Yingchao Cui, Xuemin Cheng, Jianshe Ma, and Xinnan Hou "Servo control system construction for CBHD radial and axial tracking", Proc. SPIE 7851, Information Optics and Optical Data Storage, 78510H (2 December 2010); https://doi.org/10.1117/12.870512

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KEYWORDS

Servomechanisms

Control systems

Actuators

Infinite impulse response filters

Human-machine interfaces

Channel projecting optics

Device simulation

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