Apparatus and record carrier for optically writing information

Apparatus comprising a pickup providing three beams for...

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 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...

Apparatus for detecting focus error signal

Apparatus for detecting moving direction of light beam spot illu

Apparatus for detecting position of light spot

Apparatus for detecting positional deviation of a moving stage i