Disk Device Base Structure for Strong Outer Cover Welding
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Solution Overview
Problem
The strength of welding between the end face of the base and the outer cover in disk devices is compromised due to the removal of the electrodeposition-coated film in the vicinity of the outer cover, which can lead to reduced coupling strength.
Innovation Solution
The disk device incorporates an exposed region on the second inner surface of the base, formed by cutting away the paint film, allowing for a closer alignment of the inner cover and end face, thereby increasing the width of the end face and enhancing the coupling strength with the outer cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electrodeposition-coated film is removed in the vicinity of the outer cover to prevent melting during welding, then the film protection is maintained, but the welding strength between the end face and outer cover is reduced
Solution Approach 1:
The patent applies local quality by creating an exposed region with different properties (no film) compared to the covered region (with film). The exposed region is specifically positioned at the welding location near the outer cover to prevent film melting, while the covered region maintains film protection in other areas. This localized differentiation resolves the contradiction between preventing film melting and maintaining welding strength.
Solution Approach 2:
The second inner surface is segmented into two distinct regions: a covered region where the electrodeposition-coated film is present and an exposed region where the film is removed. This segmentation allows the structure to simultaneously achieve film protection where needed and welding compatibility where required, resolving the technical contradiction.
2Ease of manufacture
If the width of the end face is reduced by cutting to accommodate the outer cover, then the outer cover can be properly positioned, but the welding strength is compromised
Solution Approach 1:
Instead of uniformly reducing the end face width, the patent applies local quality by creating a specific exposed region at the welding location. This allows the end face to maintain sufficient width for strong welding while still accommodating the outer cover positioning requirements in the specific area where the exposed region is formed.
3Quantity of substance
If the diameter of the magnetic disk is increased to improve storage capacity, then the storage capacity is improved, but the space available for welding and film coverage is reduced
Solution Approach 1:
The patent applies local quality by strategically positioning the exposed region to allow for increased magnetic disk diameter while maintaining sufficient area for welding. The exposed region is created at a specific location where it enables both larger disk capacity and proper welding access, resolving the contradiction between storage capacity and available area.
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
This configuration improves the coupling strength between the end face and the outer cover, allowing for increased diameter and storage capacity of the magnetic disk while preventing the paint film from melting during welding.
Implementation Method 1
The surface of the base is generally protected by an electrodeposition-coated film
Data Source
AI summary
A disk device includes a magnetic disk, a base, a film, an inner cover, and an outer cover. The base is provided with an internal space, and has a first inner surface surrounding the magnetic disk, a supporting surface connected to an end of the first inner surface in a first direction, a second inner surface further away from a rotation axis of the magnetic disk than the first inner surface and connected to the supporting surface, and an end face connected to an end of the second inner surface in the first direction. The film covers a covered region in the second inner surface and is spaced apart from the end face and an exposed region of the second inner surface. The inner cover is supported by the supporting surface and surrounded by the second inner surface. The outer cover is coupled to a portion of the base.