Recording apparatus, master manufacturing apparatus, and method of manufacturing an optical disc recording medium

A master manufacturing apparatus comprising:

• a master creating portion that forms a photosensitive layer, which senses light by a thermal reaction due to a laser beam irradiation, on an upper layer of a substrate to create an optical disc master;
• a recording portion that performs an information recording on the optical disc master, by performing the laser beam irradiation on the optical disc master to be rotated and driven, based on a recording waveform which has a land pulse of a first power, a recording waveform portion having a recording pulse of a second power higher than the first power, and a cooling pulse which has a third power lower than the first power and is inserted between the land pulse and the recording waveform portion, in which, when performing the recording on the optical disc master at a second speed higher than a first speed, compared to a case of performing the recording at the first speed, the recording portion does not change the length of a waveform portion including the recording waveform portion and the cooling pulse placed at both ends of the recording waveform portion and the length of the land pulse, reduces the length of the cooling pulse of a front side of the cooling pulse and expands the length of the cooling pulse of a back side thereof, thereby performing the recording on the optical disc master;
• and
• a recorded master creating portion that develops the optical disc master recorded by the recording portion and creates a recorded master formed with a concave and convex pattern.

An optical disc recording medium manufacturing method for manufacturing an optical disc recording medium on which information is recorded by a concave and convex pattern comprising:

• forming a photosensitive layer, which senses light by a thermal reaction due to a laser beam irradiation, on an upper layer of a substrate to create an optical disc master;
• performing an information recording on the optical disc master, by performing a laser beam irradiation on the optical disc master that is rotated and driven, based on a recording waveform which has a land pulse of a first power, a recording waveform portion having a recording pulse of a second power higher than the first power, and a cooling pulse which has a third power lower than the first power and is inserted between the land pulse and the recording waveform portion, wherein, when performing the recording on the optical disc master at a second speed higher than a first speed, compared to a case of performing the recording at the first speed, the length of a waveform portion including the recording waveform portion and the cooling pulse placed at both ends of the recording waveform portion and the length of the land pulse are not changed, and the length of the pulse of a front side of the cooling pulse is reduced and the length of the pulse of a back side thereof is expanded, thereby performing the recording on the optical disc master;
• developing the optical disc master recorded by the information recording to create a recorded master formed with a concave and convex pattern on the photosensitive layer;
• creating a stamper onto which the concave and convex pattern formed on the photosensitive layer is transferred, based on the recorded master;
• and
• creating the optical disc recording medium by the use of the stamper created by creating the stamper.