Optical recording medium, manufacturing method thereof, optical recording method, optical reproduction method, optical recording device, optical reproduction device and optical recording/reproduction device

摘要

An optical recording medium, with a construction and a manufacturing method thereof corresponding to those of a read-only optical recording medium and which can be manufactured inexpensively, which enables additional recording of the above-described codes, marks, and other new information, which can be recorded reliably and has satisfactory characteristics, is provided. A construction is adopted in which the optical recording medium S has an information layer 2 including a portion in which information is recorded by physical shape changes in, at least, the thickness direction or the track width direction, and which comprises a reflective film 3; the reflective film is formed of Al alloy or Cu alloy with an electrical resistivity of 20 muOmega.cm or more and 90 muOmega.cm or less, and information can be additionally recorded on the reflective film 3 by thermal recording.