Azo Metal Complex Dye for Short-Wavelength Laser Recording
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Solution Overview
Problem
Current optical information recording media, such as CD-R and DVD-R, fail to achieve adequate recording and reproduction characteristics when using short-wavelength laser beams, particularly those with wavelengths equal to or shorter than 440 nm, due to inadequate light resistance and reproduction durability of azo metal complex dyes.
Innovation Solution
An optical information recording medium is developed with a recording layer containing an azo metal complex dye where the number of transition metal ions is equal to or greater than the number of azo dye molecules, and these transition metal ions form coordination bonds with the azo dye, enhancing light resistance and reproduction durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional azo metal complex dyes are used in recording layers, then the structure is simple and manufacturing is easy, but light resistance and reproduction durability are inadequate for short-wavelength lasers
Solution Approach 1:
The patent employs composite azo metal complex dyes containing multiple metal ions (copper, zinc, and/or silver) coordinated with azo dye molecules. This composite structure combines the benefits of different metal ions to achieve both high light resistance and good reproduction durability for short-wavelength laser recording, resolving the contradiction between reliability and structural complexity.
Solution Approach 2:
The patent optimizes the ratio of metal ions to azo dye molecules (specifically 1:1 to 2:1 ratio of metal ions to dye molecules) and controls the coordination structure to achieve optimal light resistance and reproduction durability. By changing the compositional parameters and coordination geometry, the dye achieves enhanced performance for short-wavelength lasers while maintaining manageable structural complexity.
2Reliability
If the number of transition metal ions is increased to improve light resistance, then light resistance improves, but solubility and film stability may deteriorate
Solution Approach 1:
The patent carefully controls the metal ion to azo dye ratio within specific ranges (1:1 to 2:1) and selects specific metal ion combinations (copper, zinc, silver) to achieve optimal balance. This parameter optimization ensures high light resistance while maintaining adequate solubility and film stability for practical manufacturing.
Solution Approach 2:
The patent uses specific ligands and coordination structures as intermediaries between the metal ions and azo dye molecules. These coordination complexes act as mediators that allow high metal ion content for light resistance while maintaining molecular solubility and film-forming properties through controlled coordination chemistry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The medium achieves good recording and reproduction characteristics, excellent light resistance, and improved solubility and film stability when irradiated with short-wavelength lasers, making it suitable for high-density recording applications like Blu-ray discs.
Implementation Method 1
the recording layer comprises an azo metal complex dye... suitable for use as a dye in the recording layer of an optical information recording medium... permitting the recording and reproducing of information with a laser beam
Implementation Method 2
the number of transition metal ions is equal to or greater than the number of azo dye molecules, and these transition metal ions form coordination bonds with the azo dye
Data Source
AI summary
The optical information recording medium comprises a recording layer on a surface of a support. The surface of the support has pregrooves with a track pitch ranging from 50 to 500 nm, the recording layer comprises an azo metal complex dye, the azo metal complex dye is a complex of one or more azo dye and transition metal ions of which number is equal to or greater than the number of the azo dye. The azo metal complex dye comprises two or more transition metal ions per molecule, and in a molecule of the azo metal complex dye.