Optical recording medium
AssigneeMitsubishi Kagaku Media Co., Ltd.
InventorsShigeyuki Furomoto, Masaaki Mizuno, Naoyuki Uchida
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Abstract
To provide an optical recording medium exhibiting favorable write/read characteristics in high-speed recording. In an optical recording medium including a reflective layer, a dye-containing recording layer, and a transparent resin layer on a substrate in this order, a barrier layer is disposed between the recording layer and the resin layer, where the barrier layer comprises a material having a bulk thermal conductivity M of 70 W/m·K or more at 300 K and has a thickness t less than 5 nm.
Claims8
An optical recording medium comprising:
- a reflective layer, a dye-containing recording layer, and a transparent resin layer on a substrate in this order;
- and
- a barrier layer between the recording layer and the resin layer, wherein
- the barrier layer comprises a material having a thermal conductivity M of a bulk state of 70 W/m·K or more at 300 K;
- and
- the barrier layer has a thickness t less than 5 nm.
An optical recording medium comprising a first reflective layer, a dye-containing first recording layer, a transparent resin layer, a second reflective layer, a dye-containing second recording layer, and a second substrate on a first substrate in this order, wherein
- the first recording layer contains at least a metal-complex azo dye composed of an azo compound represented by the following formula (1) and Zn ions as the dye:
- where
- R1 denotes a hydrogen atom or an ester group represented by CO2R3 (where R3 denotes a linear or branched alkyl group or a cycloalkyl group);
- R2 denotes a linear or branched alkyl group;
- at least one of X1 and X2 denotes an NHSO2Y group (where Y denotes a linear or branched alkyl group containing at least two substituted fluorine atoms) and X1 or X2 not being the NHSO2Y group is a hydrogen atom;
- R4 and R5 independently denote a hydrogen atom, a linear or branched alkyl group, or a linear or branched alkoxy group;
- and
- R6, R7, R8, and R9 independently denote a hydrogen atom or an alkyl group having one or two carbon atoms;
- with the proviso that the NHSO2Y group is modified to an NSO2Y− (anionic) group by H+ dissociation and that the azo compound represented by the formula (1) forms a coordinate bond with the metal ion.
Dependencies are inferred from the claim text.