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Differential Spotsize Focusing Method by Dual Layer Detector Disclosure Number: IPCOM000117905D
Original Publication Date: 1996-Jul-01
Included in the Prior Art Database: 2005-Mar-31

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Hirasaka, Y Kimura, H Matsushita, H [+details]


Disclosed is a method for obtaining a focus error signal by using differential signals created by the optical spots which are projected to a dual layer detector.