Asymmetric Load Beam Nesting for Shock-Safe Head Stack Assemblies

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Solution Overview

Problem

The decrease in load beam-to-load beam clearance due to reduced actuator arm thickness in hard disk drives leads to potential metal-to-metal contact during shock events, scattering metal particles and causing drive failure, limiting storage density.

Innovation Solution

A head stack assembly arm design featuring asymmetric load beams with nested configurations, including lift tabs of varying sizes and alignments, coupled with rigid anchor arms and side rails, to increase clearance and mitigate contact during shock events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the actuator arm thickness is reduced to accommodate more disks and suspensions, then the storage capacity increases, but the load beam-to-load beam clearance decreases causing metal-to-metal contact during shock events

Engineering Contradiction:

Improvestorage capacityVSAvoidclearance between load beams

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent implements a nested configuration where the second suspension is positioned within the footprint of the first suspension. The load beam of the second suspension nests within the load beam of the first suspension, with the lift tab of the second suspension fitting within the clearance defined by the lift tab of the first suspension. This nesting arrangement maximizes the use of available space while maintaining adequate clearance between load beams during shock events, thereby increasing storage capacity without compromising reliability.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Volume of moving object

If the actuator arm thickness is reduced to increase storage density, then the drive footprint decreases, but the risk of metal particle generation during shock events increases

Engineering Contradiction:

Improvedrive footprintVSAvoidmetal particle generation

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The nested suspension configuration allows the second suspension to be positioned within the footprint of the first suspension, reducing the overall drive footprint. The load beam of the second suspension nests within the load beam of the first suspension, maintaining adequate clearance even with reduced arm thickness. This prevents metal-to-metal contact during shock events, thereby reducing metal particle generation while achieving higher storage density in a smaller footprint.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent employs asymmetric design in the nested suspension configuration, where the load beams and lift tabs are positioned asymmetrically relative to each other. The inner edge of the lift tab of the second suspension is offset from the inner edge of the lift tab of the first suspension, creating an asymmetric nesting pattern. This asymmetric arrangement optimizes clearance distribution and prevents contact during shock events while maximizing space utilization.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12562187B2Load beam nesting configuration for head stack assembly protection

Publication Date: 2026.02.24 MAGNECOMP CORP

AI summary

Examples of a head stack assembly arm are described herein. The head stack assembly arm includes a load beam in an upper nesting configuration including a lift tab with an inner edge. The head stack assembly arm includes a load beam in a lower nesting configuration including a lift tab with an inner edge, the inner edge of the load beam in the lower nesting configuration is a different size from the inner edge of the load beam in the upper nesting configuration.