Erasable digital video disk with reference clock track

Erasable digital video disk with reference clock track

Erase mark detecting circuit for detecting an erase mark superim

Erroneous track jump restoration apparatus for optical record di

Error compensation device for a disk signal reproduction...

Error detecting system of video/audio disc player

Error signal generating device for use in an apparatus for optic

Error-correcting storage medium reproduction apparatus and metho

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