Disk Device Spacer Rings Thickness Variation Height Error Compensation
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Solution Overview
Problem
Manufacturing errors in disk devices, such as hard disk drives (HDDs), lead to significant position errors due to variations in the thickness of magnetic disks and spacer rings, causing height discrepancies that affect the accuracy and functionality of the device.
Innovation Solution
The implementation of a method to adjust the thickness of spacer rings to minimize height errors by selecting spacer rings with specific thicknesses based on measured errors in the magnetic disks and hub flange, ensuring that at least one spacer ring has a different thickness than the others, with a difference between maximum and minimum thickness ranging from 0.01 mm to 0.09 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple magnetic disks and spacer rings are alternately stacked, then the storage capacity is increased, but the stacked height varies due to manufacturing errors of constituent members
Solution Approach 1:
The patent applies local quality by making at least one spacer ring have a different thickness from the others. Specifically, when stacking multiple magnetic disks with spacer rings, at least one spacer ring is designed with a thickness that compensates for cumulative manufacturing errors, thereby maintaining the overall stacked height within the desired range while preserving the multi-disk configuration for increased storage capacity
Solution Approach 2:
The patent utilizes parameter changes by varying the thickness parameter of spacer rings. By adjusting the thickness of at least one spacer ring to be different from the others (with the difference ranging from 0.01 mm to 0.09 mm), the cumulative height error from stacking multiple components is compensated, ensuring the final stacked height meets specifications
2Ease of manufacture
If spacer rings with uniform thickness are used, then the manufacturing process is simplified, but position errors accumulate on the uppermost part
Solution Approach 1:
The patent applies local quality by making at least one spacer ring have a different thickness from the others. Specifically, when stacking multiple magnetic disks with spacer rings, at least one spacer ring is designed with a thickness that compensates for cumulative manufacturing errors, thereby maintaining the overall stacked height within the desired range while preserving the multi-disk configuration for increased storage capacity
Solution Approach 2:
The patent utilizes parameter changes by varying the thickness parameter of spacer rings. By adjusting the thickness of at least one spacer ring to be different from the others (with the difference ranging from 0.01 mm to 0.09 mm), the cumulative height error from stacking multiple components is compensated, ensuring the final stacked height meets specifications
Data Source
AI summary
According to one embodiment, a disk device includes a housing including a base with a bottom wall, a drive motor including a pivot erected on the bottom wall and a hub rotatably supported around the pivot, ten or more magnetic disks attached to the hub and stacked on a flange of the hub, and spacer rings attached to the hub and each disposed between each respective adjacent pair of two magnetic disks. A number of the spacer rings is one less than the magnetic disks. At least one spacer ring has a thickness different from that of the other spacer rings, and a difference between a maximum thickness and a minimum thickness of the spacer rings is 0.01 mm or more and 0.09 mm or less.