Information recording medium and its production process
A technology of information recording and media, applied in the direction of optical record carrier manufacturing, data recording, information storage, etc., can solve the problems of characteristics (poor life characteristics, reduced production efficiency, production stop, etc.), and achieve excellent recording and reproduction characteristics and life characteristics, High-efficiency manufacturing and excellent productivity
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Embodiment approach 1
[0059] As Embodiment 1 of the present invention, an example of a disc-shaped information recording medium (optical disc) in which information is recorded and reproduced using laser light will be described. Fig. 4 shows a partial cross section of the information recording medium.
[0060] The information recording medium shown in FIG. 4 has a substrate 40, a first information layer 41 as an information layer b, an optical separation layer 42, a second information layer 43 as an information layer a, and a cover layer 44. The first information layer 41 , the optical separation layer 42 , the second information layer 43 serving as the information layer a, and the cover layer 44 are sequentially formed on one surface of the substrate 40 . In FIG. 4 , laser light for recording and reproducing information enters from the cover layer 44 side.
[0061] The substrate 40 is disc-shaped, and a material with a transparent and smooth surface is used. Examples of the material of the substr...
Embodiment approach 2
[0128] Another aspect of the information recording medium of the present invention will be described with reference to FIG. 1 showing a partial cross section thereof. The recording medium shown in FIG. 1 is also the same as the medium shown in FIG. 4, and has a substrate 4, a first information layer 1 as an information layer b, an optical separation layer 9, a second information layer 2 as an information layer a, and a cover layer. 13 , wherein the first information layer 1 as the information layer b, the optical separation layer 9 , the second information layer 2 as the information layer a and the cover layer 13 are sequentially formed on one surface of the substrate 4 . In FIG. 1 , laser light 3 for recording and reproducing information enters from the cover layer 14 side. The first information layer 1 has a reflective layer 5 , a dielectric layer 6 , a recording layer 7 and a dielectric layer 8 , and the second information layer 2 has a reflective layer 10 , a dielectric la...
Embodiment 1
[0134] (Sample 1 (comparison))
[0135] A recording medium having the structure shown in FIG. 4 was produced. As the substrate 40 , a polycarbonate substrate with a diameter of 120 mm and a thickness of 1.1 mm was prepared on the surface with guide grooves with irregularities at a pitch (groove surface-to-groove surface) of approximately 0.32 μm and a groove depth of 20 nm. A first information layer 41 is formed thereon. Specifically, an alloy layer containing 90 at% or more Ag with a thickness of 100 nm was formed as a reflective layer, and a ZnS-20mol% SiO layer with a thickness of 25 nm was formed sequentially by magnetron sputtering. 2 layer as the dielectric layer 46, forming a C layer with a thickness of 2nm as the interface layer 47, forming a Ge layer with a thickness of 12nm 43.5 Sb 7 Te 49.5 layer as the recording layer 48, forming ZrO with a thickness of 5nm 2 -50mol%Cr 2 o 3 layer as the interface layer 49, forming ZnS-20mol% SiO with a thickness of 65nm 2...
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Abstract
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