Magneto-optical recorded medium with a transparent substrate layer

US5031162A · kind A · utility

Assignee

• Deutsche Thomson-Brandt GmbH · DE

Inventors

• Yasuaki Morimoto · Villingen-Schwenningen, DE
• Friedhelm Zucker · Mönchweiler, DE
• Christian Buchler · Villingen-Schwenningen, DE
• Heinz-Jorg Schroder · Erbach, DE

Key dates

• Filing date: Sep 28, 1988
• Grant date: Jul 9, 1991
• Expiry date: Sep 28, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B11/10597
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An optically-recorded medium in which a reflecting optomagnetic layer is applied to a transparent substrate layer. The recorded medium stores data magnetically and by pits. The magnetically stored data and the pit stored data are superimposed on each other, so that every spot and region on the recorded medium stores both magnetically stored data and pit stored data. The recorded medium is not divided into separate regions for magnetically stored data and pit stored data, and the magnetically stored data and pit stored data may be read out simultaneously by a single light beam.