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

一种通过采用了一种结构可以低成本制造的光记录介质和一种相应于一再现专用光记录介质结构的制造方法。这种光记录介质能够附加地记录诸如密码、标记等之类其它新的信息，能够可靠地对它们加以记录，并且拥有令人满意的特性。光记录介质(S)包括有一信息层(2)，信息层(2)包括一反射膜(3)，其中通过至少沿厚度方向或轨道宽度方向的物理形状的变化形成一信息记录部分。反射膜由具有不小于20μΩ.cm和不大于90μΩ.cm的电阻率的Al合金或Cu合金形成，能够通过热记录把信息附加地记录在反射膜(3)上。 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 mu OMEGA .cm or more and 90 mu OMEGA .cm or less, and information can be additionally recorded on the reflective film 3 by thermal recording.