Jacobus Petrus Josephus Heemskerk

Methods of and information recording devices for recording and/or inhibiting recording of an information signal having copy bits with logic values which alternate in accordance with a pattern

Optical record carrier and apparatus for reading it

Record carrier, method of and information recording device for obtaining such record carriers, and information recording device comprising anti-copy means to inhibit unauthorized copying

Multi-layer information storage system with improved aberration correction

Optical focussing-error detection system

Information carrier containing auxiliary information, reading device and method of manufacturing such an information carrier

Apparatus for optically scanning an information plane wherein a diffraction grating splits the beam into two sub-beams

Record carrier with copy bits

Disc-shaped recording medium disc driving device and method and apparatus for producing disc

Disc driving device and wobble information detection method