Focus offset calibration
Focus offset correction method
Focus offset optimization for reading optically recorded data
Focus point switching
Focus position adjustment device and optical disc drive...
Focus pull-in method and optical disk device
Focus search apparatus and method
Focus search method and controller for digital disk
Focus searching method and optical disc device
Focus servo actuating circuit and optical disk device...
Focus servo apparatus
Focus servo apparatus for multi-layer disc and method for operat
Focus servo circuit apparatus with automatic bias adjustments
Focus servo circuit for a magneto-optical disk recording and rep
Focus servo control device
Focus servo control system and disk reproducing system
Focus servo controller with collision avoidance and method...
Focus servo controlling apparatus, information reproducing...
Focus servo controlling method and apparatus
Focus servo controlling method and apparatus and optical...