The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2003
Filed:
Jul. 05, 2001
Erwin Rinaldo Meinders, Eindhoven, NL;
Hermanus Johannes Borg, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The optical information medium for rewritable recording by means of a laser-light beam ( ) has a first recording stack ( ) having a phase change type recording layer ( ), sandwiched between two dielectric layers ( ), and has a second recording stack having a phase change type recording layer ( ), sandwiched between two dielectric layers ( ). A transparent spacer layer ( ) is interposed between the first recording stack ( ) and the second recording stack ( ). A metal mirror layer ( ) is present proximate the second recording stack ( ) at a side remote from the transparent spacer layer ( ). The first recording stack ( ) has a phase change type recording layer ( ) with substantially growth dominated or substantially nucleation dominated crystallization. The second recording stack ( ) has a phase change type recording layer ( ) of a kind different from the kind selected for the first recording stack ( ). An optimal recording and erasing behavior is achieved with a laser-light write pulse strategy and a recording velocity which are substantially equal for the recording layers ( ).