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. 18, 2008
Filed:
Jun. 18, 2004
Hubert Cécile François Martens, Eindhoven, NL;
Wilhelmus Robert Koppers, Eindhoven, NL;
Ronald Joseph Antonius Van Den Oetelaar, Eindhoven, NL;
Pierre Hermanus Woerlee, Eindhoven, NL;
Hubert Cécile François Martens, Eindhoven, NL;
Wilhelmus Robert Koppers, Eindhoven, NL;
Ronald Joseph Antonius Van Den Oetelaar, Eindhoven, NL;
Pierre Hermanus Woerlee, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A writable optical record carrier comprising a plurality of recording layers L0, . . . , Ln−1 separated by a spacer material, each recording layer comprising an optimum power calibration area having a first portion with an average reflection value representative of a recorded layer and a second portion with an average reflection value representative of an unrecorded layer, a method, and an apparatus for forming optimum power calibration areas on such a writable optical record carrier are presented. The optimum power calibration areas partially overlap such that the optimum power calibration areas of each pair of consecutive recording layers form a step, and the first portions of said plurality of recording layers have the form of a staircase. Each step formed by a pair of consecutive recording layers k, k+1 has a preferred minimum step size.