G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 7/0045 (2006.01) G11B 7/005 (2006.01) G11B 7/007 (2006.01) G11B 20/00 (2006.01) G11B 23/28 (2006.01)
Patent
CA 2344926
An optical recording medium having an information layer with a reflective film on which an information recording portion is formed by physical change of shape at least in one direction of thickness and track width, said reflective film having such an structure that additional recording can be performed by thermal recording, and that the reflectance of said reflective film changes in the range of 0.5 [%] ~(¦R0-R1¦/R0)x100 [%]~17[%], where R0 is reflectance of non-recording state and R1 is reflectance of recording state for reproducing beam. Such optical recording medium can be manufactured with low cost and additional recording can be done.
L'invention porte sur un support optique d'enregistrement, comportant une couche porteuse d'informations disposée sur une base présentant une zone d'enregistrement d'informations sous forme de modifications physiques au moins dans le sens de l'épaisseur et de la largeur d'une piste, et un film réfléchissant la recouvrant. La relation entre d'une part le rapport entre la réflectance R>0< du film réfléchissant (3) non enregistré et l'éclairage de lecture, et d'autre part le rapport entre la réflectance R>1< du film réfléchissant enregistré par voie thermique et l'éclairage de lecture, est donné par 0,5 [%] (|R>0<-R>1<|/R>0<) x 100 [%] = 17 [%]. Ce support d'enregistrement, peu onéreux à produire, permet d'effectuer des enregistrements additionnels.
Aratani Katsuhisa
Kobayashi Seiji
Yamamoto Masanobu
Gowling Lafleur Henderson Llp
Sony Corporation
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