Dvd disc with four information layers, and method for making...

G - Physics – 11 – B

Patent

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Details

G11B 7/24 (2006.01) B32B 15/08 (2006.01) B32B 27/36 (2006.01) G11B 5/62 (2006.01) G11B 7/26 (2006.01)

Patent

CA 2332037

A method for making a DVD-18 disc using primarily just conventional CD-type injection molding and sputtering equipments. Three substrates are molded. Each of two of the substrates has just one metallic information layer, with the opposite side being flat. The third substrate has two metallic information layers on its opposite sides. The three substrates are arranged in a sandwich configuration, with the substrate having two information layers being in the middle. Each of the outer substrates has a semireflective (gold) information layer that faces inwardly of the sandwich. The middle substrate has two fully reflective (aluminum) information layers. A very thin layer of glue is placed between the semireflective information layer on each of the outer substrates and one of the fully reflective information layers on the middle substrate.

L'invention concerne un procédé de fabrication d'un disque DVD-18 faisant appel à des équipements classiques de moulage par injection et de pulvérisation cathodique utilisés pour fabriquer des CD. Trois substrats sont moulés, dont deux présentent une couche métallique d'information à face opposée plate et dont le troisième présente deux couches métalliques d'information sur ses faces opposées. Les trois substrats sont superposés, le substrat à deux couches d'information étant intercalé. Chaque substrat extérieur comprend une couche d'information (or) semi-réfléchissante faisant face à l'intérieur. Le substrat du milieu comprend deux couches d'information (aluminium) totalement réfléchissantes. Une couche très fine de colle est déposée entre la couche d'information semi-réfléchissante sur chaque substrat externe et une des couches d'informations totalement réfléchissante repose sur le substrat du milieu.

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