Aufzeichnungstraeger mit einem metallischen Belag fuer Registriergeraete und Verfahren zur Ermittlung eines an Sauerstoff gebundenen Aluminiumanteils im Belag

摘要

A carrier medium for recording comprises a ribbon of insulating material and a metal coating deposited thereon in a thickness of at least 250 A which coating is adapted to be electrically seared for producing writing trackings. The coating is predominantly composed of vapor deposited aluminum of which at least 15% by weight is in the form of aluminum oxide, aluminum oxide hydrate or a combination of these two compounds.