Patent ID: 8649250

Claim:
A series of disc shape optical recording media comprising a plurality of optical recording media, all of the optical recording media including a plurality of planar recording and reading layers with no projections and depressions for tracking control, and a servo layer with projections and depressions for tracking control, thereby recording information on the recording and reading layers while conducting tracking control by using the servo layer, the plurality of optical recording media have different numbers of stacked planar recording and reading layers, the plurality of optical recording media have a support substrate which is disposed farther from a light incident surface than the plurality of planar recording and reading layers, the stacked planar recording and reading layers of the plurality of optical recording media are read and written by a same optical pickup, the plurality of optical recording media have the same position among the plurality of optical recording media of the servo layers with respect to the corresponding light incident surfaces, and wherein a first fixed distance is set to a fixed first numerical value and a second fixed distance is set to a fixed second numerical value; interlayer distances of the stacked planar recording and reading layers alternate between the fixed first distance and the second fixed distance for adjacent ones of the recording and reading layers in the stack in each of the plurality of optical recording media.