Focusing servo controlling apparatus

Focusing servo device and focusing servo method

Focusing servo device, optical disc recording/reproducing...

Focusing servo in an optical disk drive

Focusing servo pull-in apparatus

Focusing servo system and focus servo acquisition enable with mu

Focusing servo system with focus servo acquisition enable which

Focusing-error detecting apparatus with a simple photodetector u

Focussing system and methods for multi- track optical disk appar

Focussing system and methods for multi-track optical disk appara

For jumping a light spot on a track of a recording medium

Four-axial driving actuator for optical pickup

Fringing field focus motor and mechanism for optical disk drive