Recording layer for optical information recording medium and optical information recording medium

Abstract

The invention provides a recording layer for optical information recording medium with excellent recording characteristics and an optical information recording medium with the recording layer. The recording layer for recording by laser irradiation comprises: oxide containing Mn. The atomic ratio of the Mn to all the metal elements of the oxide in the recording layer is below 80 atom% and the recording layer does not contain metal Mn.

Description

technical field [0001] The present invention relates to a recording layer for an optical information recording medium and an optical information recording medium. Background technique [0002] Optical information recording media (optical discs) are represented by optical discs such as CD, DVD, and BD, and are roughly classified into three types: read-only type, write-once type, and rewritable type according to the recording / reproducing method. Among them, the recording methods of write-once optical discs are roughly classified into the following methods: a phase-change method in which a recording layer is phase-transformed; an interlayer reaction method in which a plurality of recording layers are reacted; and a decomposition method in which a compound constituting the recording layer is decomposed ; An opening method in which recording marks such as holes and pits are locally formed on the recording layer. [0003] In the phase change method, it is proposed to use a materi...

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Problems solved by technology

[0017] As the recording material disclosed in the above-mentioned prior art, it is difficult to satisfy these requirements with the recording material alone.

[0018] In the phase change method, the reflectivity of the recording layer alone is low, so the reflectivity in the state of the disc should be increased, and a reflective film is required, and in order to increase the degree of modulation, it is necessary to install ZnS-SiO on the upper and lower sides of the recording layer 2 Equal dielectric layer (dielectric film), the number of layers constituting the optical disc increases, and the productivity is poor

Since the interlayer reaction method also requires multiple recording layers, the number of layers constituting the optical disc increases and the productivity is poor.

[0019] In the decomposition method, optical information recording media using organic pigment materials are widely used as the recording layer. However, it is difficult to absorb short-wavelength (near 400nm) visible light such as blue laser light and blue-violet laser light, so good results cannot be obtained. recording information, can not increase the recording density

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