COVER PANE WITH AN ANOMALOUS STRESS PROFILE, METHOD FOR ITS PRODUCTION AND ITS USE

Die Erfindung betrifft allgemein Deckscheiben, insbesondere Deckscheiben für elektronische Anzeigegeräte. Weiterhin betrifft die Erfindung ein Verfahren zur Herstellung einer solchen Deckscheibe sowie deren Verwendung. A cover glass is provided that includes a silica based glass ceramic with a thickness between 0.4 mm and 0.85 mm. The glass ceramic has a transmittance of more than 80% from 380 nm to 780 nm and a stress attribute selected from: an overall compressive stress (CS) of at least 250 MPa and at most 1500 MPa, a compressive stress at a depth of 30 μm (CS30) from one of the two faces of at least 160 MPa and at most 525 MPa, a depth of the compression layer (DoCL) of at least 0.2 times the thickness and less than 0.5 times the thickness, and any combinations thereof. The glass ceramic has at least one silica based crystal phase having in a near-surface layer a unit cell volume of at least 1% by volume larger than that of a core where the crystal phase has minimum stresses.