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

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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.

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

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