| 摘要 |
Sandwiched structures for an optical disc, especially for Blu-ray discs, are disclosed. According to one exemplary structure, a substrate is sandwiched by two cover layers on both sides of a disc As a result, similar characteristics in material on both sides of the disc help sustain the shape and flatness of the disc. To provide the cover layers in uniform thickness, techniques for creating or producing such a cover layer are described. In one embodiment, a certain amount of the material in liquid form is dispensed onto a dispensing structure. After the dispensing structure is engaged to hold a disc, the dispensing structure and the disc as a whole unit is rotated at a predefined speed. While the dispensed material on the dispensing structure is being dispersed evenly onto the surface of the disc as result of the centrifugal force, a heater is employed to retain or control the temperature of the dispensed material so that the flow of the dispensed material outwards can be effectively controlled to form a cover layer of uniform thickness on the disc.
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