METHOD FOR MANUFACTURING OPTICAL RECORDING MEDIUM AND ITS MANUFACTURING APPARATUS

摘要

A method for manufacturing a magneto-optical recording medium where an optical recording film is formed on an optical phase pit formed in a substrate. From the magneto-optical recording medium, both of a phase pit signal and a signal recorded in the recording film formed on the optical recording film are optically reproduced. By changing the gas pressure during the sputtering of the recording film on the substrate, the modulation degree of the phase pit is adjusted. This enables production of an inexpensive and uniform optical recording medium where the jitters of the RAM signal and phase pit signal are reduced to less than 10% of a desired one.