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:
May. 31, 2005
Filed:
Dec. 04, 2001
Johannes Cornelis Norbertus Rijpers, Eindhoven, NL;
Guo-fu Zhou, Eindhoven, NL;
Johannes Cornelis Norbertus Rijpers, Eindhoven, NL;
Guo-Fu Zhou, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An optical information medium () for erasable recording by means of a laser-light beam () is provided. A substrate () holds a stack () of layers with a phase-change recording layer () between a first dielectric layer () and a second dielectric layer (). A light-absorptive layer () is present proximate the recording layer () and is made of a compound of the formula QR, in which Q is the element Si, Ge, Ti, Zr, Hf, Nb or Ta, R is the element O or N, and 0<x≦2.5, in order to achieve that 0.8<A/A<1.50, in which Aand Aare the respective quantities of laser-light absorbed in the recording layer () in the crystalline state and the amorphous state at a laser-light wavelength selected from a range of 350-450 nm. Thus high data rates and low data jitters are achieved at this short wavelength range by tuning x to an optimal value during manufacture of the optical information medium.