Optical Disk Servo Control System

Der-Chang Hsieh; Edward V. LaBudde; Robert J. Johnson

doi:10.1117/12.933378

27 May 1982 Optical Disk Servo Control System

Der-Chang Hsieh, Edward V. LaBudde, Robert J. Johnson

Proceedings Volume 0329, Optical Disk Technology; (1982) https://doi.org/10.1117/12.933378
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States

Abstract

The optical memory servo control system performs five major functions. They are micro-processor control, disk spindle speed control, focusing, seeking and radial track-following. Preliminary laboratory results show that an average seek time of 100 msec and one track seek of 300 μsec were achieved over a total of 40,000 tracks. Radial tracking with an error less than 0.1 μm was obtained through a tracking servo. These radial tracking and random access capabilities were achieved by combining the use of a specially designed galvanometer and a translator carriage. Normal operating focus error of less than 0.1 μm was also obtained. Finally, the overall servo control system is greatly enchanced through a microprocessor controller with an adaptive control algorithm. This provides high flexibility to the servo system design in order to meet the stringent performance requirements of an optical memory system. A mathematical model of the complete servo system was developed. The analytical information was used to design and fabricate a laboratory model optical memory device.

Citation Download Citation

Der-Chang Hsieh, Edward V. LaBudde, and Robert J. Johnson "Optical Disk Servo Control System", Proc. SPIE 0329, Optical Disk Technology, (27 May 1982); https://doi.org/10.1117/12.933378

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