Disk Device Ramp Load Mechanism Design
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Solution Overview
Problem
In disk devices like hard disk drives, variations in magnetic disk positions due to dimensional differences can cause the data areas on recording surfaces to narrow as suspensions move towards unload positions, leading to inconsistent abutment with ramps, which affects data area size.
Innovation Solution
The disk device incorporates a ramp load mechanism with multiple inclined surfaces that support suspensions, where the positions and angles of these surfaces are designed to ensure that the first abutment occurs farther from the first rotation axis, thereby maintaining a wider data area by adjusting the positions and angles of inclined surfaces to prevent early contact and maintain data area stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suspension moves toward the unload position with standard ramp positioning, then the magnetic head is separated from the magnetic disk, but the data area of the recording surface narrows due to early abutment
Solution Approach 1:
The patent introduces a new spatial dimension by positioning ramps at different radial distances from the rotation axis. Instead of all ramps being at the same position, the second ramp is placed closer to the rotation axis than the first ramp, creating a stepped radial arrangement that delays early abutment and prevents data area narrowing.
Solution Approach 2:
Different ramps are assigned different positions and functions based on their radial location. The first ramp (farther from axis) and second ramp (closer to axis) have distinct roles in the suspension movement sequence, with each ramp's local position optimized to control the abutment timing for specific suspensions.
2Ease of operation
If multiple suspensions move to unload position simultaneously, then all magnetic heads are separated from magnetic disks, but positions of suspensions abutting ramps vary due to magnetic disk position differences
Solution Approach 1:
The ramp system is segmented into multiple independent ramps positioned at different radial locations. This segmentation allows different suspensions to interact with different ramps, distributing the abutment events across multiple spatial zones and reducing the impact of individual suspension position variations.
Solution Approach 2:
The multi-position ramp structure serves multiple functions: it separates magnetic heads from disks, accommodates position variations among suspensions, and maintains consistent data area boundaries. The system handles diverse suspension positions universally through its distributed ramp arrangement.
Data Source
AI summary
A disk device includes magnetic disks, ramps, suspensions, and magnetic disks. The magnetic disks are arranged above a housing bottom and configured to be rotated around a first rotation axis. The ramps are arranged above the housing bottom. The suspensions are configured to be rotated around a second rotation axis parallel to the first rotation axis, The magnetic heads are mounted on the suspensions, respectively. Each of the suspensions is configured to be rotated around the second rotation axis from a first position above or below one of the magnetic disks to a second position on one of the ramps. The plurality of ramps includes a first ramp and a second ramp that is above the first ramp. An inner end of the second ramp is closer to the first rotation axis than is an inner end of the first ramp.