Optical disc with textured edge
AssigneeCinram International Inc.
InventorsEdward Pickutoski, Kenneth Rinaldi
Life of this patent
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Abstract
A method for producing optical discs is provided. A substrate for an optical disc is formed by utilizing a molding process. A textured surface is formed at an outer diameter edge of the substrate. A protective coating is applied to cover the textured surface at the outer diameter edge. The protective coating adheres securely to the textured surface at the outer diameter edge to prevent seepage of moisture into the optical disc through the outer diameter edge surface. Thus, an improved optical disc which avoids moisture-caused warpage, corrosion and/or oxidation can be formed.
Claims27
A method for producing optical discs, the method comprising:
- (a) forming a substrate for an optical disc by utilizing a molding process, wherein a substrate surface formed at an outer diameter edge of the substrate by the molding process is textured;
- and
- (b) applying a protective coating over the textured substrate surface.
An apparatus for forming optical discs, the apparatus comprising:
- a molding element for forming a substrate for an optical disc, the molding element including a textured surface for forming a side surface of the substrate at an edge of the substrate;
- and
- a coating device for applying a coating substance to the optical disc,
- wherein the side surface of the substrate formed by the textured surface of the molding element is textured, and a portion of the coating substance attaches to the textured disc surface.
An optical disc comprising (i) a substrate including a textured surface at an outer diameter edge of the substrate, and (ii) a protective coating over the textured surface at the outer diameter edge of the substrate.
Dependencies are inferred from the claim text.