Organic Dye Recording Layer for Wavelength-Adaptive BCA Storage
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Solution Overview
Problem
Current write-once type information storage media using organic dye materials face challenges in recording BCA patterns due to wavelength dependency, particularly when transitioning from a 650 nm wavelength to 405 nm, leading to inability to record patterns even with a BCA recording apparatus, and suffer from coating non-uniformity issues during manufacturing.
Innovation Solution
The use of an organic dye material with absorption characteristics adjusted to accommodate both 600 nm to 700 nm and 405 nm wavelengths, allowing BCA information to be recorded using a 650 nm to 690 nm laser light source, and optimizing the suction cup shape to prevent coating non-uniformity by ensuring the recording layer is formed outside the suction cup trace area, thus maintaining a uniform thickness in the burst cutting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic dye material with absorption characteristics adjusted for both 600-700 nm and 405 nm wavelengths is used, then BCA patterns can be recorded on next-generation media with 650 nm to 690 nm laser light source, but the material composition becomes more complex
Solution Approach 1:
The patent modifies the absorption characteristics of the organic dye material by adjusting its chemical composition and molecular structure to absorb both 600-700 nm and 405 nm wavelengths. This parameter change enables the material to work with different laser wavelengths, resolving the contradiction between wavelength adaptability and material simplicity.
Solution Approach 2:
The patent employs composite organic dye materials that combine multiple chromophores or use dendrimer structures with specific absorbing groups. These composite materials achieve broad-spectrum absorption covering both 600-700 nm and 405 nm ranges, allowing compatibility with both current and next-generation recording apparatuses.
2Manufacturing precision
If suction cup shape is optimized to prevent coating non-uniformity, then recording layer thickness uniformity in burst cutting area is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies local quality by designing the suction cup with different geometric characteristics at different locations. The suction cup has a specific shape where the suction force is distributed non-uniformly to compensate for the natural coating thickness variation, creating uniform recording layer thickness only in the critical burst cutting area while allowing variation in other areas.
Solution Approach 2:
The suction cup shape is pre-designed and pre-formed before the coating process. The specific geometry (including curved surfaces and varying radii) is established in advance to predictively compensate for coating non-uniformity, eliminating the need for real-time adjustments during manufacturing.
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
Enables successful recording of BCA patterns on next-generation information storage media without the need for new recording apparatuses and minimizes coating non-uniformity, ensuring stable reproduction signals with less than 10% variation in reflectance, thereby enhancing the reliability and stability of the storage medium.
Implementation Method 1
an organic dye material with absorption characteristics adjusted to accommodate both 600 nm to 700 nm and 405 nm wavelengths
Data Source
AI summary
An embodiment of the invention, to provide a recording method and a storage medium for BCA data with high reliability for a storage medium and a method for reproducing BCA data from the storage medium, and an information recording apparatus and an information reproducing apparatus. In a conventional optical disk, low reliability data is recorded in a data area of BCA. Thus, the thickness of a film material for use in a recording layer oriented to BCA data or close to the inner periphery of the storage medium in the vicinity thereof is formed in uniform thickness by using a substrate of the storage medium, the substrate being formed by being suctioned by means of adsorbing mechanisms formed in an arc shape so as to integrated two of the adsorbing mechanisms to be adjacent to each other.