METHOD AND APPARATUS FOR MANUFACTURING GLASS MOLDED PRODUCT, METHOD FOR MANUFACTURING OPTICAL DEVICE, METHOD FOR MANUFACTURING INFORMATION RECORDING MEDIUM SUBSTRATE, AND METHOD FOR MANUFACTURING INFORMATION RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To stably supply a glass molded product, an optical device, a substrate for information recording medium and an information recording medium in a high productivity. SOLUTION: Synchronous transfer and stopping of multiple lower dies 6 are repeated, and the supplying of molten glass, the press molding of the supplied molten glass and the removal of molded parts formed by molding are performed while the lower dies 6 are stopped. Here, reference signals are repetitively generated in a certain cycle, and the timings of the supplying of molten glass, the beginning of transfer and stopping of the lower dies 6 and the commencement and termination of press molding are controlled based on the reference signals. The total time of periods in which the lower dies 6 are transferred and stopped is equal to the reference signal generation cycle.