Focus sensing method with improved pattern noise rejection

Daniel R. Marshall

doi:10.1117/12.45931

1 July 1991 Focus sensing method with improved pattern noise rejection

Daniel R. Marshall

Proceedings Volume 1499, Optical Data Storage '91; (1991) https://doi.org/10.1117/12.45931
Event: Optical Data Storage, 1991, Colorado Springs, CO, United States

Abstract

Focus error sensing is a subject which has received much effort and ingenuity as the optical data storage industry has matured, yet there is still a need for techniques which provide improved accuracy, responsiveness and noise immunity. This paper discusses a class of techniques which demonstrate common mode rejection of signal corruption, and a particular member of that class which is based on lossless reflection at an interface.

Citation Download Citation

Daniel R. Marshall "Focus sensing method with improved pattern noise rejection", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); https://doi.org/10.1117/12.45931

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