Patent ID: 9495994
Filing Date: 2016-11-15
CPC Classification: G11B

Claim Text:
1. An optical disc medium comprising a land and a groove at which information can be recorded, wherein a predetermined number of address information units which record address information of the land or groove are provided in a circumferential direction of the optical disc medium, the address information unit of the land includes three or more address recording areas capable of recording address information, the address information is recorded on one area selected from among the three or more address recording areas, the one area to be selected from among the three or more address recording areas for recording the address information of the land is different among three address information units adjacently arranged in a radial direction, wobbles are formed on the land and the groove, the wobbles include a base wobble and an information wobble indicating a predetermined logical value of 0 or 1, the address information is recorded with the logical value of the information wobble, the logical value 0 of the information wobble is represented by a waveform having a phase different from a phase of the base wobble by about −90 degree, and the logical value 1 of the information wobble is represented by a waveform having a phase different from a phase of the base wobble by about +90 degree, the wobble of the groove adjacent to a land on the inner circumference side has the same waveform as the wobble of the groove adjacent to the land on the outer circumference side, and variation of track width of the land or groove is suppressed to a predetermined range.