Master-optical-disk processing method and mastering apparatus

A processing method for a master disk for a land-and-groove recording rewritable optical medium having a physical format in which a groove and a land, are switched for each track, said groove is wobbled at a frequency in a phase identical to that of an adjacent track, prepits having track sector information are not on spirals identical to those of said groove comprising:

• storing a signal for the wobbling in a read-only memory;
• outputting said digital data in synchronization with an original clock signal for generating a process-for-prepits signal and a process-for-groove signal;
• forming a composite signal of said wobbling signal generated by performing said phase correction, and a signal for deflecting a laser beam inward and outward by a half-track pitch from the center of said groove, said signal for detecting the laser beam being non-linearly formed by an analog voltage signal including a rectangular-shaped pulse wave;
• applying said composite signal to an optical deflector, using acousto-optic effects or an optical deflector using field-optic effects;
• and
• performing laser processing for said groove and said prepits on one track by a single processing scan using optical deflection based on said composite signal wherein said signal processing scan is performed on a plurality of arbitrary points including a center of said groove and positions shifting inward and outward by half-track pitch from said center.

A process for producing an optical disk, comprising the steps of:

• a. manufacturing a master disk for a land and groove recording rewritable optical medium having a physical format in which a groove and a land are switched for each track, and prepits having track-sector information are not on spiral identical to those of said groove, comprising the sub-steps of:
• performing optical deflection of a laser beam with an optical deflector using at least one of acousto-optic effects and optical deflector using field-optical effects, said deflection of the laser beam being non-linearly formed by an analog voltage signal including a rectangular-shaped pulse wave;
• and
• performing laser processing of said groove and said prepits on one track by a single processing scan of irradiating a master disk with said laser beam wherein said single processing scan is performed on a plurality of arbitrary points including a center of said groove and positions shifting inward and outward by a half-track pitch from said center;
• and
• b. forming an optical disk by using said master disk.

A process for producing an optical disk, comprising the steps of:

• a. manufacturing a master disk for a land-and-groove recording rewritable optical medium having a physical format in which a groove and a land are switched for each track, said groove is wobbled at a frequency in a phase identical to that of each adjacent track, and prepits having track-sector information are not on spirals identical to those of said groove, comprising the sub-steps of:
• storing a signal for the wobbling in a memory;
• outputting said signal for the wobbling in synchronization with an original clock signal for generating a process-for-prepits signal and a process-for-groove signal and providing said signal for the wobbling with phase correction;
• forming a composite signal of said wobbling signal generated by performing said phase correction, and a signal for deflecting a laser beam inward and outward by a half-track pitch from the center of said groove, said signal for deflecting the laser beam being non-linearly formed by an analog voltage signal including a rectangular-shaped pulse wave;
• applying said composite signal to an optical deflector using at least one of acousto-optic effects and an optical deflector, using field-optical effect, and
• performing laser processing for said groove and said prepits on one track by a single processing scan using optical deflection based on said composite signal wherein said single processing scan is performed on a plurality of arbitrary points including a center of said groove and positions shifting inward and outward by a half-track pitch from said center;
• and
• b. forming an optical disk by using said master disk.