Optical Recording Medium Warpage Suppression via UV Curing
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Solution Overview
Problem
Existing optical recording media face challenges in suppressing warpage during and after the attachment process, particularly due to uneven inversion rates and substrate thickness variations.
Innovation Solution
The optical recording medium consists of two discs with substrates of specific thickness (0.3 mm to 0.545 mm) and an ultraviolet curable resin attachment layer, where both surface sides of the attachment layer have equal or substantially equal inversion rates (≥70%), ensuring uniform curing and reduced warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If substrate thickness is increased to suppress warpage, then structural stability improves, but manufacturing precision requirements increase due to tight thickness constraints
Solution Approach 1:
The patent applies parameter changes by precisely controlling the substrate thickness within a specific range (0.3 mm to 0.545 mm) and the inversion rate of the attachment layer (70% or higher on both surface sides). By optimizing these parameters, the patent achieves warpage suppression while maintaining manufacturability, resolving the contradiction between structural stability and manufacturing precision requirements.
2Stability of the object's composition
If inversion rate of attachment layer is increased to reduce warpage, then attachment uniformity improves, but curing process complexity increases
Solution Approach 1:
The patent applies dimensionality change by irradiating ultraviolet light from both sides of the attachment layer simultaneously. This bidirectional curing approach achieves uniform inversion rates (70% or higher) on both surface sides, ensuring attachment uniformity while simplifying the overall curing process compared to sequential single-sided curing methods.
3Use of energy by moving object
If substrate thickness is reduced to improve light transmission, then optical performance improves, but warpage suppression becomes difficult
Solution Approach 1:
The patent resolves this contradiction by optimizing the substrate thickness parameter within the range of 0.3 mm to 0.545 mm. This specific thickness range balances light transmission efficiency with sufficient structural rigidity to suppress warpage, whereas thinner substrates would transmit light better but be more prone to warping.
4Ease of manufacture
If attachment layer inversion rate is made uneven to simplify curing, then manufacturing ease improves, but warpage occurs
Solution Approach 1:
The patent applies bidirectional ultraviolet light irradiation to achieve uniform inversion rates (70% or higher) on both surface sides of the attachment layer. This approach maintains flatness and suppresses warpage while remaining manufacturable, resolving the contradiction between manufacturing ease and flatness maintenance.
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
This configuration effectively suppresses warpage and enhances durability by maintaining uniform inversion rates and substrate thickness, improving the reliability and storage performance of the optical recording medium.
Implementation Method 1
irradiating, with ultraviolet light, an ultraviolet curable resin layer interposed between two discs from both sides of the two discs, and curing the ultraviolet curable resin
Data Source
AI summary
Provided is an optical recording medium including: two discs, each of which includes a substrate and a plurality of recording layers; and an attachment layer which is provided between the two discs and includes ultraviolet curable resin, wherein thickness of each of the substrates in the two discs is equal to or greater than 0.3 mm and equal to or less than 0.545 mm, wherein transmittance of the two discs is equal to or less than 20%, and wherein inversion rates on both surface sides of the attachment layer are equal or substantially equal to each other, and are equal to or greater than 70%.