Focus error detecting device
Focus error detecting device
Focus error detecting method and optical head using the same
Focus error detection device for an optical recording/playing ba
Focus error detection device for an optical recording/playing ba
Focus error detection system for an optical recording/reproducin
Focus error detection using an equal path length lateral shearin
Focus error detection with two symmetrically splitted reflected
Focus error detector
Focus error detector
Focus error signal generation using a birefringent lens with...
Focus error signal generation using a birefringent plate...
Focus error signal generation using confocally filtered detectio
Focus error signal generation using two polarizers in...
Focus initialization system for optical recording
Focus jump control apparatus of a player for multilayer recordin
Focus jump device for reproducing information from a storage...
Focus layer jump control circuits and methods of controlling...
Focus offset calibration
Focus offset correction method