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:
Aug. 09, 2016
Filed:
May. 17, 2004
Hubert Cécile François Martens, Eindhoven, NL;
Ruud Vlutters, Eindhoven, NL;
Hubert Cécile François Martens, Eindhoven, NL;
Ruud Vlutters, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
The invention relates to an optical storage medium comprising below an entrance face (EF) a higher recording stack (ST) comprising a higher recording layer (L) and at least a lower recording stack (ST), said lower recording stack (ST) being recorded or read back by a radiation beam () entering into the optical storage medium through the entrance face (EF) with a wavelength (λ), focused on said lower recording stack (ST) and transmitted through the higher recording stack (ST), a recording of the higher recording layer (L) causing an optical thickness variation between recorded and unrecorded areas of said first recording layer (L), which is included into the range [0.03λ, 0.125λ].