B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 3/02 (2006.01) G11B 7/24 (2006.01) G11B 7/26 (2006.01)
Patent
CA 2505341
An optical disk substrate with a central hole is disclosed in the invention. The optical disk substrate includes: a first annular area for clamping, which surrounds the outer edge of the central hole and includes a first upper surface and a first lower surface thereon; and a second annular area for forming an information storing area, which surrounds the outer edge of the first annular area and includes a second upper surface and a second lower surface thereon; besides, the first lower surface and the second lower surface are on the same plane, whereas the first upper surface is higher than the second upper surface. Moreover, an optical disk that applies the optical disk substrate and a method for forming the optical disk are also disclosed in the invention.
L'invention concerne un substrat de disque optique doté d'un trou central. Le substrat de disque optique comprend: une première zone annulaire destinée à la fixation, entourant le bord externe du trou central et comprenant une première surface supérieure et une première surface inférieure; et une seconde zone annulaire permettant de former une zone de stockage d'informations, entourant le bord externe de la première zone annulaire et comprenant une seconde surface supérieure et une seconde surface inférieure; la première surface inférieure et la seconde surface inférieure sont sur le même plan, alors que la première surface supérieure est plus haute que la seconde surface supérieure. De plus, l'invention concerne un disque optique mettant en oeuvre le substrat de disque optique et un procédé permettant de former le disque optique.
Blake Cassels & Graydon Llp
Princo America Corp.
Princo Corp.
LandOfFree
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