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Optical information recording medium, producing method thereof and method of recording/erasing/reproducing information
| Details |
Inventors: Yamada, Noboru; Otoba, Mayumi; Nagata, Kenichi; Kawahara, Katsumi;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Diamond; Alan
Assistant Examiner:
Attorney, Agent or Firm: Ratner & Prestia
In a phase-change recording medium, a recording medium is provided with a barrier layer including Ge--N, Ge--N--O between a recording layer and a dielectric protective layer in order to prevent a chemical reaction and an atom diffusion between the recording layer and the dielectric protective layer. A barrier material can be also applied to the protective layer itself. Thereby, it is possible to considerably suppress a reduction of a reflectivity and a reduction of a signal amplitude due to the repeat of recording and erasing, such reductions being observed in a conventional phase-change optical information recording medium, and thereby the number of overwriting times can be increased. |
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DETAILED DESCRIPTION In order to solve above problems, according to one aspect of the present invention, there is provided an optical information recording medium comprising a recording layer generating a reversible phase change which can be optically detected according to an irradiation of an energy beam, and a material layer which is named a barrier layer formed in contact with at least one surface of the recording layer, wherein an atomic diffusion and a chemical reaction occurred between the protectove layer and the recording layer are suppressed by the barrier layer.
A material constituting the barrier layer (a barrier material) itself can be applied to a protective layer material as it is.
In this case, more specifically, it is expressed as the protective layer using the barrier material.
According to another aspect of the present invention, preferably, there is provided an optical information recording medium, wherein a barrier material layer is disposed at both sides of a recording layer.
According to a structure in which the barrier material is applied to a substrate side of the recording layer, an effect for suppressing the atomic diffusion and the chemical reaction between the recording layer and the protective layer is higher, thereby a cycle performance is enhanced.
According to the structure in which the barrier material is applied to the side opposite to the substrate of the recording layer, the effect for enhancing a stability of rewrite performance is higher, thereby a reliability is enhanced.
Not only the structure in which the barrier material is applied to both sides of the recording layer combines both characteristics, but also both performances are further enhanced.
According to further aspect of the present invention, preferably, there is provided an optical information recording medium, wherein when the barrier material is represented by M.
sub.
a X.
sub.
b (where, M denotes an aggregate of non-gas elements M.
sub.
1, M.
sub.
2, .
.
.
, and X denotes the aggregate of gas elements X
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Metal Working 
