Johannes Jacobus Verboom

Method, apparatus and record carrier body for optically writing information

Optical data recorder with segment synchronization marks

Optically readable record carrier with track undulations for producing a synchronizing clock signal and apparatus for forming such track

Apparatus for recording data on a disc-shaped optically readable record carrier

Disc-shaped optically readable record carrier used as a data storage medium

System for transmitting digital information, coding arrangement for use in that system, decoding arrangement for use in that system and record carrier for use in that system

Focus offset optimization for reading optically recorded data

Optical information storage apparatus including eccentricity compensator

Sampled servo for an optical disk drive

Track format for use with an optical record carrier having a varying track pitch