Optical recording medium and method for producing optical...

G - Physics – 11 – B

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G11B 7/24 (2006.01)

Patent

CA 2729263

An object of the invention is to provide an optical recording medium and a method for producing an optical recording medium that enable to improve the quality of a servo signal and a reproduction signal. The optical recording medium (40) satisfies: t3-t4~1 µm, t4-t2~1 µm, t2~10 µm, and t1-(t2+t3+t4)~1 µm, where t1 is a thickness between a surface (40z) of the optical recording medium (40), and the first information recording surface (40a), t2 is a thickness between the first optical recording surface (40a) and the second information recording surface (40b), t3 is a thickness between the second optical recording surface (40b) and the third information recording surface (40c), and t4 is a thickness between the third optical recording surface (40c) and the fourth information recording surface (40d).

L'invention porte sur un support d'enregistrement optique dans lequel les qualités de signaux d'asservissement et de signaux de reproduction sont améliorées, et sur un procédé de fabrication du support d'enregistrement optique. Un support d'enregistrement optique (40) satisfait les inégalités suivantes : t3 - t4 = 1 µm, t4 - t2 = 1 µm, t2 = 10 µm, et t1 - (t2 + t3 + t4) = 1 µm, où, (t1) est une épaisseur entre une surface (40z) et une première surface d'enregistrement d'informations (40a) d'un support d'enregistrement optique (40), (t2) est une épaisseur entre la première surface d'enregistrement d'informations (40a) et une deuxième surface d'enregistrement d'informations (40b), (t3) est une épaisseur entre la deuxième surface d'enregistrement d'informations (40b) et une troisième surface d'enregistrement d'informations (40c), et (t4) est une épaisseur entre la troisième surface d'enregistrement d'informations (40c) et une quatrième surface d'enregistrement d'informations (40d).

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