G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 7/26 (2006.01)
Patent
CA 2085383
An optical disc includes a recording film formed on one surface of a disc-shaped plastics substrate having light transmission properties, and an antistatic film formed on the other surface of the substrate to which an optical beam is applied, in which the plastics substrate is made by injection molding and a U-shaped annular groove or ridge is formed on the whole circumference on the surface, a radius of which is a distance between the center and a joint position of an injection mold, and a method for manufacturing the same.
L'invention est un disque optique comportant une couche d'enregistrement formée sur l'une des faces d'un substrat de plastique transparent en forme de disque et d'une couche antistatique formée sur l'autre face du substrat sur lequel un faisceau lumineux est projeté; le substrat de plastique est fabriqué au moyen d'un moulage par injection et un sillon ou une crête annulaire en forme de U est formé sur toute la circonférence de la surface, le rayon sur cette dernière étant la distance entre le centre et un point de jonction du moule à injection. La méthode de fabrication de ce disque est également révélée.
Inui Tetsuya
Nagaura Toshikazu
Ohta Kenji
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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