Optical information processing device and tracking control method thereof for use with grooveless multilayer optical disc
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United States of America Patent
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Feb 4, 2014
Grant Date -
Nov 29, 2012
app pub date -
May 23, 2012
filing date -
May 26, 2011
priority date (Note) -
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Abstract
An optical information device used with a grooveless multilayer disc including multiple recording layers used to record and reproduce information signals and a guide layer dedicated to detect tracking error signals (TES) can always stably detect the TESs when the distance between the recording layer and guide layer varies due to selection of a target recording layer. For example, a plurality of light spots for detecting the TESs are formed by a holographic grating on the guide layer, but are defocused with respect to each other. The TESs are detected individually from the respective light spots. The TESs are subjected to an addition operation to be a signal for tracking control, thereby extraordinarily increasing the defocus dynamic range of the TESs.
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