Hard Disk Media Substrate Groove for Clip-Free Registration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-metallic media substrates, such as glass discs, often have sharp edges that can damage buff tape or read/write heads during processing, and the use of clips for registration can lead to misalignment, shadowing, and inconsistent deposition due to electromagnetic interference and physical shadowing, resulting in reduced performance and increased defects.
Innovation Solution
The introduction of an annular groove on the outer diameter of the media substrate, formed using laser cutting and edge treatment, enhances mechanical alignment and bias capability, allowing for precise registration and reduced shadowing during processing, thereby improving the reliability of the deposition process and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clips are used for registration, then the substrate can be held during processing, but misalignment and shadowing occur due to electromagnetic interference and physical shadowing
Solution Approach 1:
The patent removes the registration clips from the system entirely and replaces them with an annular groove feature integrated into the substrate itself. This extraction eliminates the source of electromagnetic interference and physical shadowing while maintaining the registration function through the groove's geometric alignment with the processing tool.
Solution Approach 2:
The annular groove serves as an intermediary registration feature between the substrate and the processing tool. Instead of using external clips that cause interference, the groove acts as a built-in mediator that provides precise alignment through its geometric relationship with the tool, eliminating shadowing effects.
2Ease of operation
If clips are used for registration, then the substrate can be held during processing, but electromagnetic interference and physical shadowing reduce performance and increase defects
Solution Approach 1:
The registration clips are completely removed from the processing system and replaced by an annular groove feature that is part of the substrate itself. This extraction eliminates the source of electromagnetic interference and physical shadowing that caused deposition non-uniformity and defects.
3Ease of manufacture
If sharp edges are present on the substrate, then the substrate can be easily manufactured, but the edges damage buff tape or read/write heads during processing
Solution Approach 1:
The annular groove is formed as a preliminary feature during substrate manufacturing, before the substrate enters processing. This pre-formed groove serves dual purposes: it provides registration alignment and simultaneously rounds the outer diameter edge, eliminating sharp edges that would otherwise damage buff tape or read/write heads during subsequent processing operations.
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
The annular groove enables more precise and reliable registration of the substrate, minimizing misalignment and shadowing, leading to improved deposition uniformity and reduced damage to the substrate and processing tools, resulting in enhanced performance and consistency in data storage systems.
Implementation Method 1
laser cutting the substrate from a sheet of substrate material
Implementation Method 2
forming an annular groove in a thickness of a surface at the outer diameter
Data Source
AI summary
A non-metallic media substrate includes a disc-shaped substrate body having at least one media storage surface on a face thereof. The substrate body has a center opening having an inner diameter and an outer diameter surface, and the substrate body has a thickness. The substrate further includes an annular groove at the outer diameter of the media substrate, the annular groove having chamfered edges and an internal concavity extending toward the inner diameter.