Flexure supported read head
Fluid bearing for axially movable head
Focal position detecting optical apparatus
Focus acquisition and maintenance for optical disk system
Focus control method and optical disc recording/reproducing...
Focus control system for optical read-out apparatus
Focus control through detection of the rate of error in discs wi
Focus detecting apparatus utilizing reflecting surface having va
Focus detection and control apparatus for maintaining accurate f
Focus error detection device for an optical recording/playing ba
Focus error detection device for an optical recording/playing ba
Focus initialization system for optical recording
Focus operation for an optical disk device
Focus operation for an optical disk device
Focus servo control device for optical disks having servo offset
Focus servo control method in optical disc device
Focus servo control system for automatically adjusting a relativ
Focus servo device for detecting and compensating for disk abnor
Focus servo device for use in an optical information read-out de
Focus servo device of a system for reading out recorded informat