PRODUCTION OF MASTER DISK FOR RECORDING

摘要

PURPOSE:To enable development monitoring and detection of an end point by providing a developement monitor zone equal approximately to the signal of the blank groove or ruggedness of the groove depth having the longest section to the position of a master disk corresponding to the outside of the recording and reproducing region of an information recording medium in the stage of manufacturing a replica disk. CONSTITUTION:The zone 15 for monitoring development has the blank groove approximately equal to the groove depth having the longest recording section in the master disk for recording and a recording width of about 2-3 times (about 2-3mm.) the diameter of the irradiating spot during development monitoring. The recording position is preferably the outside circumferential position on the master disk where the zone 15 does not exist on the replica in the stage of manufacturing a die from the master disk and making the replica. The diffraction in the tangent direction by the signal is thus eliminated and the intensity of the 1st order or second order diffracted light of the monitor light is increased. The monitor signal having good S/N is thus obtd.