Koninklijke Philips Corporation N.v.

Hermanus Henricus Josephus Wilting

Roel Van Woudenberg

Jan Johannes Van Den Broek

Johannes Cornelis Norbertus Rijpers

The optical data storage medium () has a substrate () with a surface area having tracks () of marks representing stored information. The information is readable by means of a scanning radiation beam (). A reflective layer () is present, reflecting the radiation beam (). The medium has a radiation beam () reflection larger than 50%. The reflective layer () comprises a compound of the formula Al,X, in which formula Al is aluminum and X is an element selected from the group of Ge and Si. The letter y is the atomic fraction of X in at. %. The value of y is in the range 5&#x3c;y&#x3c;35. The reflective layer () has a radiation beam absorption, which enables controlled ablative recording or solid-phase change recording of an identification mark (').

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Eindhoven, Netherlands

Hermanus Henricus Josephus Wilting