Focus adjustment system for optical disk apparatus

Focus and tracking error detector apparatus for optical and magn

Focus and tracking repeatable runout compensator

Focus and tracking servo decoupling system

Focus balance automatic adjusting device and automatic adjusting

Focus capture method for magneto-optic disk drives

Focus control apparatus

Focus control apparatus for multilayer optical recording medium

Focus control apparatus for multilayer optical recording medium

Focus control apparatus for use with an optical disk for determi

Focus control apparatus in multi-layered disk reading apparatus

Focus control device and method for use in multilayer optical di

Focus control device for use with an optical pickup comprising a

Focus control device of an optical disk apparatus

Focus control device to perform focus control for a multi-layer

Focus control device to perform focus control for a multi-layer

Focus control for optical disk unit

Focus control for optical scanner

Focus control method and focus controller

Focus control method, and optical disk unit with focus offset co