Optical information medium and a method of manufacturing the...

G - Physics – 11 – B

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G11B 7/24 (2006.01) G11B 7/243 (2006.01) G11B 7/254 (2006.01) G11B 7/257 (2006.01) G11B 7/26 (2006.01)

Patent

CA 2435652

An optical information medium (20) for recording, such as DVR-blue, and a method for manufacturing such a medium (20) is provided. Reading from and recording onto the medium (20) is performed by means of a focused radiation beam (10) having a radiation wavelength & and a numerical aperture NA. Said medium has a substrate (1), and a stack (2) of layers provided thereon. The stack (2) comprises at least a first recording stack (3) and k radiation beam transmissive layers (4, 5). Each transmissive layer (4, 5) has a refractive index ni and an average thickness di ~m and 1 = i = k and k = 2. The thickness dk of layer k (5) is determined by a simple formula which depends on the parameters ni for i & 1...k and di for i = 1...k-1. Such a medium (20) has zero or substantially zero spherical aberration at the focal point, being at the recording layer of the first recording stack (3), of said radiation beam (10).

L'invention concerne un support d'informations optique (20) d'enregistrement, tel que DVR-blue, et un procédé de fabrication d'un tel support (20). La lecture depuis le support (20) et l'enregistrement sur le support (20) s'effectuent au moyen d'un faisceau (10) de rayonnement focalisé présentant une longueur d'onde de rayonnement .lambda. et une ouverture numérique NA. Ledit support comprend un substrat (1) où est formé un empilement (2) de couches. L'empilement (2) comprend au moins un premier empilement d'enregistrement (3) et k couches (4,5) de transmission de faisceaux de rayonnement. Chaque couche de transmission (4, 5) comporte un indice de réfraction n¿i? et une épaisseur moyenne de d¿i? µm et 1 <= i <= k et k >= 2. L'épaisseur d¿k? de la couche k (5) est déterminée par une formule simple qui dépend des paramètres n¿i? pour i = 1...k et d¿i? pour i = 1...k-1. Un tel support (20) présente une aberration sphérique nulle ou pratiquement nulle au niveau du foyer situé sur la couche d'enregistrement du premier empilement (3) d'enregistrement dudit faisceau (10) de rayonnement.

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