Dual-layer dvd disc and method and apparatus for making same

Details Dual-layer dvd disc and method and apparatus for making same Dual-layer dvd disc and method and apparatus for making same

G - Physics

11

B

G11B 7/24 (2006.01) B29D 17/00 (2006.01) B32B 7/06 (2006.01) G11B 7/26 (2006.01)

Patent

CA 2345349

A dual-layer DVD disc that does not require a stamping step (typically as part of the 2P prior art manufacturing process) during its manufacture, A polycarbonate substrate (64) is molded and coated with a semireflective data layer (66), in the usual way. A PMMA substrate (60) is molded and coated on its surface (60a) with a fully reflective data layer (62). Adhesive (68) is placed on the semireflective data layer (66), and the fully reflective data layer (62) is transferred from its PMMA substrate (60) to the polycarbonate substrate (64). A force is applied in the direction of the arrows (72) on the PMMA to separate it from the remaining structure. The polycarbonate substrate thus ends up with two data layers in conformance with the DVD specifications, and the PMMA substrate can even be recycled for another use.

DVD double couche ne nécessitant pas d'étape de pressage (faisant normalement partie du procédé 2P actuel) pour sa fabrication. Un substrat à base de polycarbonate (64) est moulé et revêtu d'une couche de données semi-réfléchissante (66) de la manière habituelle. Un substrat PMMA (60) est moulé et sa surface (60a) est revêtue d'une couche de données totalement réfléchissante (62). Un adhésif (68) est posé sur la couche semi-réfléchissante (66) et la couche totalement réfléchissante (62) est transférée de son substrat PMMA (60) sur le substrat à base de polycarbonate (64). Une force est appliquée dans le sens des flèches (72) sur le PPMA de façon à le séparer du reste de la structure. Le substrat à base de polycarbonate terminé comprend deux couches de données conformes aux spécifications des DVD et le substrat PMMA peut même être recyclé en vue d'une autre utilisation.

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