Patent ID: 8337729

Claim:
An optical disc manufacturing method, the method comprising: an injection step of injecting a liquid material into a circular plate-shaped injection space having a center hole portion at a center from an injection hole connected to an inner edge portion in the injection space; a discharge step of discharging air and the liquid material from a discharge hole formed on a straight line passing through the injection hole and the center of the center hole portion in a plane direction of the circular plate and at a position opposite to the injection hole; a curing step of curing the liquid material injected into the injection space; a takeout step of taking out the cured liquid material from the injection space; wherein the injection space comprises a casting cell; wherein, in the injecting and the discharging, the casting cell is held in an internal space that is formed by a base mold on which the casting cell is placed and a cover mold that covers an upper portion of the base mold and has the same thickness as that of the casting cell; and wherein the base mold includes a center column that is provided to protrude from a bottom plate, secures the internal space having the same thickness as that of the casting cell when the cover mold is placed on the base mold, and prevents the liquid material from leaking from opening portions of the casting cell connected to the injection hole and the discharge hole by passing through the center hole portion in the casting cell.