Effects Of Disk Substrate Quality On Optical Drive Performance

C. H. Chung; William Harvey

doi:10.1117/12.936845

14 January 1987 Effects Of Disk Substrate Quality On Optical Drive Performance

C. H. Chung, William Harvey

Proceedings Volume 0695, Optical Mass Data Storage II; (1987) https://doi.org/10.1117/12.936845
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

The quality of substrate that exists between the optical head and the media sensitive layer is known to critically influence the drive performance. First, we report here the degradation of the servo and read signals by the parallelism of the two surfaces of the plastic substrate. It is conclusive that the peak to peak variation of plastic parallelism in the radial direction over one revolution can cause tracking instability and data cross talk. Consequently, the seek accuracy and bit timing accuracy in the optical drive are degraded. Second, we report that the variation of birefringence over one revolution results in the variation of light feedback into the laser cavity. This increases the laser noise, and thus degrades the read performance, especially when the laser output power is in the lower range.

Citation Download Citation

C. H. Chung and William Harvey "Effects Of Disk Substrate Quality On Optical Drive Performance", Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987); https://doi.org/10.1117/12.936845

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