| 摘要 |
PROBLEM TO BE SOLVED: To obtain a simple configuration of an optical recording medium.SOLUTION: A recording layer 101 of an optical recording medium 100 has recorded information by the formation of a three-dimensional recording mark RM in a uniform layer, and includes a recess and a protrusion for servo formed on one plane, which is the recess and the protrusion for positioning to identify a position in a plane direction. A substrate 102 as an adjacent layer is disposed adjacent to the recess and the protrusion for positioning on the recording layer 101, and a refractive index difference Δn from the recording layer 101 at the wavelength of a servo optical beam LS to be used for the servo is ≥0.04. |
