Substrate for optical recording medium, optical recording medium, master disc, master disc recording apparatus, and signal generating apparatus

A master disc recording apparatus for recording information on a master disc used to produce a substrate for an optical recording medium having,

• a plurality of recording tracks formed at least in guide grooves on a disc;
• and
• an address section comprising an address pit sequence formed between said recording tracks in said guide grooves along an information reading direction of said recording tracks, and wherein:
• said recording tracks in said guide grooves are divided into a prescribed number of zones,
• in each of said zones, the center of said address section corresponding at least to the recording track in the radially outermost or radially innermost guide groove is disposed so as to shift in a radial direction of said disc in relative relationship to the center of said recording track in said guide groove,
• said master disc recording apparatus comprising:
• portions corresponding to said guide grooves and said address section are formed on a glass master disc having a photoresist layer;
• a light source for photographically exposing said photoresist layer on said glass master disc;
• an optical modulator for modulating light of said light source in accordance with an address signal;
• and
• a first EO deflector for deflecting a beam of said optically modulated light in synchronism with timing of said address signal, and thereby forming said address section by making the center of said address section coincide with the center of said recording track in said guide groove;
• and
• a second EO deflector for accepting the light output from said first EO deflector, and for applying an offset by deflecting said light beam in the radial direction of said master disc in such a manner that (a) in an area for said recording tracks, said guide grooves are formed so as to wobble along the direction of said address pit sequence, and that (b) in an area for said address section, in said each zone the center of said address section corresponding at least to the recording track in the radially outermost or radially innermost guide groove shifts in the radial direction of said disc in relative relationship to the center of said recording track in said guide groove.