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...

Focus servo device

Focus servo gain setting circuit for optical record disc reprodu

Focus servo pull-in apparatus for use in a compatible disk playe

Focus servo recovery processing method for optical disc...

Focus-balance calibration method

Focus-balance calibration method

Focus/tracking actuator with moving-magnet motors

Focus/tracking servo automatic gain control for optical recordin

Focused-spot-position detection device for optical information r