Abstract
Conventional methods of focusing error detection have their respective disadvantages. To eliminate such difficulties, we have developed a new focusing error detection method. We have devised a unique principle for detection, by simulating the effect of each optical parameter on the focusing error detection characteristics, and evaluating the characteristics of the newly established optical head. This error detection method is influenced less by the tracking error signal, and it is also possible to obtain a tracking error signal from the same photodetector.
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