| 摘要 |
PURPOSE:To record and reproduce information with a high S/N by a low laser output, by laminating a low-melting point alloy layer and an inorganic pigment thin film layer. CONSTITUTION:An aluminium thin film having about 800nm thickness is formed as a reflective film 2 on one face of a substrate 1 by vacuum deposition, and a low-melting point alloy having a thickness of 50-500nm is formed on this film 2 by sputtering, and a recording layer 4 having <=100nm thickness and consisting of an inorganic pigment is formed on the layer 3 by the vacuum deposition method or the like. The beam diameter of a laser light is 1mum, and a recessed part 11 is formed by its thermal action to record information. The peripheral part of the recessed part becomes round easily in a fused part of the low-melting point alloy layer by the surface tension, and the inorganic pigment thin film recording layer is moved to the peripheral part of the recessed part simultaneously to correct the recessed part to a completely round recessed part, and therefore, a high S/N is attained. It is necessary that the melting point of the low-melting point alloy layer is sufficiently lower than that of the inorganic pigment thin film recording layer. |
