Image Number 7 for United States Patent #5171585.
Improvement in a method for molding a plastic substrate for an optical disk having a concave-convex pattern on a side surface thereof including a step of feeding liquid resin into a molding cavity defined by a pair of mold halves, characterized in that, when the molded plastic substrate is released from the mold halves, the molded plastic substrate is released at least simultaneously in time from both of the mold halves in a mold-opening stage.
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