Optical Recording Medium Asymmetric Sheet Rotation Warpage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for manufacturing optical information recording media with multiple layers suffer from unevenness in layer thickness due to web coating techniques, leading to impaired uniformity and potential warpage in the final product.
Innovation Solution
The optical information recording medium is configured with unit structure sheets where the recording and adhesive layers are applied in specific directions, with each pair of sheets having application directions shifted 180 degrees relative to each other, and adhesive layers distributed in orientation-specific groups to cancel out thickness unevenness and distribute warping forces uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If web coating method is used to apply materials in one direction, then manufacturing efficiency is improved, but uniformity in layer thickness deteriorates
Solution Approach 1:
The patent applies asymmetry by rotating alternating unit structure sheets by 90 degrees relative to each other. This creates an asymmetric arrangement where the application directions of adjacent sheets are perpendicular, preventing the accumulation of thickness unevenness while maintaining the efficiency of unidirectional web coating application.
2Quantity of substance
If multiple unit structure sheets are laminated to increase recording capacity, then storage capacity is improved, but thickness uniformity deteriorates due to cumulative unevenness
Solution Approach 1:
By arranging unit structure sheets with alternating 90-degree rotations, the patent creates an asymmetric pattern that distributes thickness variations randomly rather than cumulatively. This allows multiple sheets to be laminated for increased capacity while preventing systematic accumulation of thickness unevenness.
3Ease of manufacture
If adhesive layers are applied in the same direction in all unit structure sheets, then manufacturing process is simplified, but warpage is caused due to uneven stress distribution
Solution Approach 1:
The patent introduces asymmetry by rotating alternating sheets by 90 degrees, which automatically orients the adhesive layers in perpendicular directions. This asymmetric arrangement distributes adhesive stress uniformly across the laminate, preventing warpage while maintaining relatively simple manufacturing processes.
Data Source
AI summary
An optical information recording medium is provided which comprises a laminate of unit structure sheets, each including an adhesive layer configured as an intermediate layer and at least one recording layer. The unit structure sheets are each made with the recording layer and the adhesive layer formed by applying materials in one specific application direction, and the unit structure sheets in one optical information recording medium are classifiable into pairs such that application directions therefor in each pair are shifted 180 degrees from each other.