Optical Disc Cover Layer Rib Design for Stack Separation
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Solution Overview
Problem
Optical discs with flat surfaces stacked closely tend to adhere to each other, making it difficult to pick out individual discs from a stacked set, especially in high-capacity storage scenarios where minimizing space is crucial.
Innovation Solution
The optical disc recording medium features a cover layer with varying thicknesses: a first thickness on the inner circle, a second thickness forming an outer rib, and a third thickness forming a depression, which reduces adherence between discs when stacked by minimizing contact areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If optical discs with flat surfaces are stacked closely to reduce storage space, then storage density is improved, but the discs adhere to each other making it difficult to pick out individual discs
Solution Approach 1:
The outer circumferential portion of the optical disc is segmented into a raised portion and an inclined surface. The raised portion creates a physical separation gap between stacked discs, while the inclined surface provides a gradual transition that prevents adhesion. This segmentation allows discs to be stacked closely for high storage density while maintaining ease of separation by preventing strong adhesive bonds between disc surfaces.
Solution Approach 2:
The invention transitions from a two-dimensional flat surface to a three-dimensional structured surface by adding the raised portion and inclined surface. This dimensional change creates vertical separation and angular surfaces that reduce contact area between stacked discs, thereby reducing adhesion forces while maintaining compact stacking arrangement.
2Ease of operation
If the outer circumferential portion is formed with an inclined surface to accommodate raised portions, then disc stacking adherence is reduced, but the manufacturing complexity increases
Solution Approach 1:
The raised portion and inclined surface are merged into a single integrated outer circumferential portion structure. This combination is formed in one molding process step, eliminating the need for separate manufacturing operations. The integrated design reduces manufacturing complexity while achieving the dual function of raising the surface and providing an inclined transition to reduce adhesion between stacked discs.
Data Source
AI summary
An optical disc recording medium includes: a substrate; at least one recording layer formed on at least one side of the substrate; and a cover layer formed on the substrate and the recording layer. The cover layer having a first thickness with reference to a surface of the substrate, in an inside of a circle having a first radius from a center of the substrate. The cover layer having a second thickness larger than the first thickness with reference to the surface of the substrate, on a circumference having a second radius longer than the first radius from the center of the substrate. The cover layer having a third thickness smaller than the first thickness with reference to the surface of the substrate, on a circumference having a third radius longer than the first radius and shorter than the second radius from the center of the substrate.