G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/257 (2006.01)
Patent
CA 2579126
The invention relates to an optical data carrier (1, 10) comprising a thermochromic layer (4, 11, 20) including a dielectric transition material (21) and metal nano-particles (22) embedded in said transition material (21) for absorbing at least a part of an irradiation (3) applied to said optical data carrier (1, 10) for reading out data from said optical data carrier (1,10) and/or for recording data on said optical data carrier (1, 10). The invention further relates to an optical master (30) for manufacturing an optical data carrier, said optical master (30) comprising such a thermochromic layer (20, 32). In order to provide an optical data carrier (1, 10) or an optical master (30) with a thermochromic material which allows a choosing of the position of the absorption band and of the temperature at which a thermochromic effect takes place and which is further sufficiently fast and stable, it is proposed that said transition material (21) has a first value of a material characteristic being a specific volume and/or a thermal expansion coefficient of said transition material (21) below a transition temperature (Tg, Tm) and a second value of said material characteristic above said transition temperature (Tg, Tm), said second value being higher than said first value.
Support de données optiques (1, 10) comprenant une couche thermochromique (4, 11, 20) comportant une matière de transition diélectrique (21) et des nanoparticules métalliques (22) intégrées dans la matière de transition (21) en vue de l'absorption au moins partielle d'un rayonnement (3) appliqué sur le support (1, 10) en vue de la lecture des données provenant du support (1,10) et/ou de l'enregistrement des données sur le support (1, 10). Disque original (30) permettant la fabrication d'un support de données optiques, ledit disque (30) comprenant une telle couche thermochromique (20, 32). Afin d'obtenir le support (1, 10) ou un disque (30) à matière thermochromique permettant la sélection de la position de la bande d'absorption et de la température à laquelle l'effet thermochromique a lieu, et suffisamment rapide et stable, il est préférable que la matière de transition (21) comprenne une première valeur d'une caractéristique de matière représentant un volume spécifique et/ou un coefficient d'expansion thermique de la matière (21) inférieur à une température de transition (Tg, Tm) et une seconde valeur de caractéristique de matière dépassant la température de transition (Tg, Tm), la seconde valeur étant supérieure à la première valeur.
Koninklijke Philips Electronics N.v.
Smart & Biggar
LandOfFree
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