HAMR Drive Enclosure Arcuate Channel for Laser Diode Unit
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Solution Overview
Problem
Low form factor heat-assisted magnetic recording (HAMR) drives face challenges in accommodating the vertically projecting laser diode units (LDUs) during manufacture and operation, leading to issues with pinch force testing robustness and operational shock, as the limited vertical spacing results in destructive contact with the drive enclosure.
Innovation Solution
Incorporating arcuate channels in the enclosure, either in the cover or base, to accommodate the distal portion of the LDUs, allowing for increased pinch force robustness and preventing contact during operational shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drive enclosure uses a low form factor design, then the drive size is reduced, but the laser diode units come into destructive contact with the enclosure during pinch force testing and operational shock
Solution Approach 1:
The patent introduces arcuate channels that extend in the vertical dimension (z-axis) to accommodate the laser diode units. These channels provide additional vertical space, allowing the LDUs to move freely during pinch force testing and operational shock without contacting the enclosure walls, thus resolving the conflict between compact drive size and reliability.
2Length of stationary object
If the vertical spacing in the enclosure is minimized for compact design, then the drive form factor is reduced, but the laser diode units contact the enclosure during operation
Solution Approach 1:
The patent segments the enclosure interior by introducing arcuate channels that create dedicated pathways for the laser diode units. These channels are positioned to receive and guide the LDUs, effectively segmenting the available space to prevent harmful contact while maintaining overall compact dimensions.
3Device complexity
If the enclosure structure is simplified without additional features, then manufacturing complexity is reduced, but the laser diode units cannot be accommodated during stroke movement
Solution Approach 1:
The patent employs arcuate (curved) channels instead of straight or angular pathways. The curved geometry of these channels allows the laser diode units to follow a smooth arc during their stroke movement, accommodating their motion trajectory while maintaining a relatively simple monolithic enclosure structure without complex mechanical guides.
Data Source
AI summary
An apparatus comprises a heat-assisted magnetic recording drive which includes an enclosure having a base and a cover. The drive includes a magnetic recording disk and a head gimbal assembly proximate one of the base and the cover. The HGA supports a slider assembly comprising a laser diode unit. The LDU projects away from the HGA towards one of the base and the cover. An arcuate channel is provided in one of the base and the cover and dimensioned to receive a distal portion of the LDU. The channel has a length that accommodates the distal portion of the LDU along a stroke of the HGA.