Optical Disk Thin Wall Inclined Surface Separation
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Solution Overview
Problem
Existing disk-shaped recording media face challenges in accurately separating stacked optical disks without foreign substance adhesion and maintaining data integrity, particularly due to the design of the thin wall portions at the center of the substrates, which can lead to unstable separation operations and potential damage during recording and reproduction.
Innovation Solution
The optical disk design incorporates a laminated structure with symmetrical substrates and inclined surfaces on the thin wall portions, preventing foreign substance adhesion and ensuring accurate separation by allowing foreign substances to easily roll away, and the use of circular annular ribs to prevent data storage region collisions during stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin wall portion is formed at the center of the substrate to enable separation of stacked optical disks, then the separation operation can be performed, but foreign substances may adhere to the thin wall portion causing unstable separation and potential damage
Solution Approach 1:
The thin wall portion is designed with an inclined surface instead of a flat or vertical surface. This curved/angled configuration causes foreign substances to roll away from the thin wall portion during separation operations, preventing adhesion and ensuring stable separation while maintaining the ability to separate stacked optical disks
Solution Approach 2:
The inclined surface of the thin wall portion converts the harmful effect of foreign substance accumulation into a beneficial effect by causing foreign substances to roll away. The same inclined surface that prevents adhesion also guides foreign substances away from critical areas, turning a potential harm into a protective feature
2Measurement precision
If the thin wall portion is designed to facilitate separation, then separation accuracy improves, but the structural integrity and quality of the optical disk may be compromised
Solution Approach 1:
The thin wall portion is designed with specific local characteristics (inclined surface) that differ from the rest of the substrate. This localized quality change enables separation functionality while the overall substrate maintains its structural integrity and optical quality, resolving the contradiction between separation accuracy and disk quality
3Productivity
If optical disks are stacked closely to increase storage density, then productivity and space utilization improve, but the risk of data storage region collisions and foreign substance adhesion increases
Solution Approach 1:
The inclined surface on the thin wall portion creates a self-cleaning effect that prevents foreign substance adhesion even when disks are stacked closely. This curved surface configuration allows close stacking for high density while automatically preventing foreign substances from accumulating and causing damage
Solution Approach 2:
The circular annular rib divides the recording region into separate segments, preventing collision between data storage regions of adjacent stacked disks. This segmentation allows tight stacking for high density while protecting against data region overlap and foreign substance contamination
Data Source
AI summary
An information recording medium of the present exemplified embodiment is configured by laminating a substrate having a predetermined thickness and a substrate having a predetermined thickness to each other. A film forming region including a recording region, a clamp region and a rib are formed on one surface of the information recording medium. A film forming region including a recording region, a clamp region and a rib are formed on the other surface of the information recording medium. On both surfaces, the components are formed in the order of the rib, the clamp region and the film forming region toward an outer peripheral side from an inner peripheral side.