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Proceedings Paper

Differential spot-size focus servo
Author(s): Tomas D. Milster; Mark Shi Wang; Fred Franklin Froehlich; J. L. Kann; Jeffrey P. Treptau; James Kevin Erwin
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Paper Abstract

We describe performance of a differential spot-size (wax-wane) focus servo. Cross talk from the tracks are analyzed in the single detector and differential focus circuits. Magnitude of the cross talk is reduced by a factor of three in the differential circuit. A false FES signal is present when the spot crosses sector marks at na angle.

Paper Details

Date Published: 1 July 1991
PDF: 6 pages
Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); doi: 10.1117/12.45899
Show Author Affiliations
Tomas D. Milster, Optical Sciences Ctr./Univ. of Arizona (United States)
Mark Shi Wang, Optical Sciences Ctr./Univ. of Arizona (United States)
Fred Franklin Froehlich, Optical Sciences Ctr./Univ. of Arizona (United States)
J. L. Kann, Optical Sciences Ctr./Univ. of Arizona (United States)
Jeffrey P. Treptau, Optical Sciences Ctr./Univ. of Arizona (United States)
James Kevin Erwin, Optical Sciences Ctr./Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 1499:
Optical Data Storage '91

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