Optical recording structures

摘要

The extent of a pit (50) formed in the data layer along the vertical axis and transverse axis are not more than 0.25 microns and 1 microns, respectively. The extent of the pit along the principal axis is at least twice greater than the extent along the transverse axis. The ratio of the maximum displacement of the pit from index level in two opposite directions along vertical axis, lies in the range of 0.2-5.