Optical Disk Thin Portion Inclined Surface
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Solution Overview
Problem
The stacking of optical disks with existing structures leads to adhesion and adherence of foreign particles, which deteriorates the quality of the disks.
Innovation Solution
A disk-shaped information recording medium with a substrate having a cylindrical portion, a thin portion surrounding the outer diameter of the cylindrical portion, and an inclined surface at an angle between 25 to 35 degrees, which prevents foreign particles from adhering and facilitates easy separation of stacked disks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If optical disks are stacked to increase storage capacity, then storage capacity is improved, but adhesion between disks and adherence of foreign particles occur, deteriorating disk quality
Solution Approach 1:
The patent applies local quality by creating a thin portion with a specific inclined surface at the outer diameter of the cylindrical portion, while the rest of the disk maintains its normal structure. This localized structural modification prevents foreign particle adhesion and disk adhesion without affecting the overall storage capacity of the stacked disks.
Solution Approach 2:
The patent uses a curved inclined surface (25-35 degrees) instead of a flat surface at the thin portion. This curvature design prevents foreign particles from adhering to the disk surface and facilitates easy separation of stacked disks, thereby maintaining disk quality while enabling increased storage capacity through stacking.
2Reliability
If a thin portion with inclined surface is formed to prevent adhesion and foreign particle adherence, then disk quality is maintained, but manufacturing complexity increases
Solution Approach 1:
The thin portion with inclined surface is formed only at the outer diameter of the cylindrical portion, not throughout the entire disk. This localized approach maintains disk quality while minimizing the impact on manufacturing complexity, as only a specific region requires additional processing.
Solution Approach 2:
The patent specifies a particular inclination angle range (25-35 degrees) for the thin portion surface. This parameter optimization balances the need for effective foreign particle prevention and disk separation with manufacturing feasibility, avoiding excessively complex manufacturing requirements while achieving the desired quality improvement.
Data Source
AI summary
The disk-shaped information recording medium having an outer diameter and an inner diameter comprises a substrate having a predetermined thickness, a first side that is one side of the substrate, a second side that is the other side of the substrate, a cylindrical portion forming a through hole formed at a center of the substrate, and a thin portion formed so as to surround an outer diameter of the cylindrical portion. The thin portion is thinner than the predetermined thickness and includes a non-inclined surface and an inclined surface formed on an outer diameter side of the non-inclined surface. The inclined surface is inclined at an angle greater than or equal to 25 degrees and less than or equal to 35 degrees with respect to the non-inclined surface.