Scanning head for an optical disc system

Sector mark detecting apparatus in optical disc apparatus

Sector mark pattern detection for optical data disk controller

Sector mark signal control circuit for disc apparatus

Semiconductor laser control method and semiconductor laser...

Semiconductor laser source optical reading head

Servo control apparatus and method for compensating for...

Servo control system for head recording and/or reproducing infor

Servo control system for optical system which focuses a convergi

Side-spot focus apparatus for optical disc recording and/or play

Signal decoding apparatus and method

Signal detecting system for use in optical reading apparatus

Signal detection system for use in an optically reproducing appa

Signal detector for an optical information reproducing apparatus

Signal processing apparatus for disc memory devices

Signal reproducing apparatus for optical recording and reproduci

Signal reproducing apparatus providing PLL circuit controlled by

Single digital signal processor to record digital audio data on

Small-sized video or audio pickup device having a beam deflector

Smooth lock-in of servo control when switched on