Apparatus with position detecting means for recording and/or rep

Arrangement for producing precise tracking error signal for opti

Arrangement for reading an optically readable carrier

Arrangement for reading an optically readable light reflective c

Arrangement for reading an optically readable light reflective c

Arrangement for reproducing data readable by an optical scanner

Arrangements for correction of focusing light beam, and...

Assembling method for optical system of optical pick-up

Assembly method of optical pickup and optical pickup apparatus

Astigmatic difference correcting method for optical head and app

Astigmatic method for detecting a focussing error in an optical

Asynchronous crosstalk cancellation

Atomic force microscopy disk data storage system with nonradial

Audio signal compression method

Auto gain adjustment apparatus and method for focusing and track

Autofocus system

Automated servo control system

Automatic attitude correcting system for optical disc device

Automatic control system for a tracking servo unbalance of optic

Automatic gain control apparatus