|Recording medium, address recording method and apparatus, and recording/reproducing method and apparatus for reducing crosstalk of addressing signals
|Dec. 1, 1998/ March 17, 1997
|Yoshida; Tadao, Nonaka; Chiaki
|Improvement to allow accurate, low cross-talk ADIP tracking even with small track pitch. (Beneficial for 80 minute blanks with 1.5um pitch?). Includes very careful description of how ADIP tracking is accomplished.
|Edges on both sides of each groove on a disk 11 are wobbled to indicate the addresses of recording locations. A laser beam for detection of data is radiated to a land for recording data, forming a spot 51-1. Two laser beams for detection of a tracking error are radiated to edges on both sides of a groove in such a way that the middle between the two laser beams coincides with the center of the groove, forming spots 51-2 and 51-3. By using such a tracking-error detecting laser beam to read out address information, the laser beam can be radiated to only the edge on a predetermined side of a groove. As a result, an address can be read out with a reduced amount of crosstalk from another groove even if the track pitch is small. Address information is thus read out with a highly accurate degree even in the case of a small track pitch.