Apparatus and method to compensate for disturbance using...

Apparatus and methods for digital data recording

Apparatus and record carrier for optically writing information

Apparatus comprising a pickup providing three beams for...

Apparatus for advancing a video disc pickup transducer beyond a

Apparatus for aligning optical axis of optical pick-up

Apparatus for and method of detecting defocus error signal...

Apparatus for automatically adjusting focus offset and...

Apparatus for automatically controlling focus and method thereof

Apparatus for causing a head to access a selected one of a plura

Apparatus for controling servo signal gains of an optical...

Apparatus for controlling a optical disk drive

Apparatus for controlling bias amount of focus error signal

Apparatus for controlling eccentricity in photo-record...

Apparatus for deriving synchronizing signal from pre-formed mark

Apparatus for detecting a deviation of a reading position for us

Apparatus for detecting a focus error and a tracking error of an

Apparatus for detecting a position of a light spot on an optical

Apparatus for detecting and correcting focusing and tracking err

Apparatus for detecting dropout, an error signal extracting...