Vibration Sensor Dampening Assembly for Hard Drive Shock Detection

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Solution Overview

Problem

Hard drives experience reading and writing errors due to shock events caused by thermal expansion stress between components of different materials, which induce vibrations that are difficult to detect accurately with existing vibration sensors due to their high sensitivity and oversaturation.

Innovation Solution

A dampening assembly is positioned between the actuator assembly and the vibration sensor assembly, using a flex circuit with conductive layers and a stiffener to dampen vibration amplitudes, allowing the vibration sensor to detect shock events without becoming oversaturated, and a vibration sensor with specific bandwidth resonance to accurately sense multidirectional vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a vibration sensor with high sensitivity is used to detect shock events, then the detection capability is improved, but the sensor becomes oversaturated and cannot accurately detect the shock events

Engineering Contradiction:

Improvedetection capabilityVSAvoidsensor saturation

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

A dampening assembly is introduced as an intermediary component between the actuator assembly and the vibration sensor assembly. This dampening assembly selectively attenuates high-amplitude vibrations caused by shock events while allowing lower-amplitude operational vibrations to pass through, preventing sensor saturation and enabling accurate detection of shock events.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The dampening assembly modifies the vibration parameters by reducing the amplitude of shock-induced vibrations before they reach the sensor. This parameter transformation allows the sensor to operate within its optimal detection range, converting otherwise undetectable saturated signals into measurable vibrations.

Inventive Principle:

Principle #35Parameter changes

2Speed

If the vibration sensor is directly coupled to the actuator assembly, then the detection response is improved, but the sensor cannot differentiate between shock events and normal operational vibrations

Engineering Contradiction:

Improvedetection responseVSAvoidevent differentiation

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The dampening assembly serves as a selective mediator that differentiates between shock events and normal operations based on vibration amplitude characteristics. It allows the sensor to maintain direct coupling for rapid response while filtering out normal operational vibrations, enabling accurate event differentiation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a dampening assembly is added between the actuator assembly and vibration sensor assembly, then the sensor can detect shock events without saturation, but the device complexity increases

Engineering Contradiction:

Improvedetection accuracyVSAvoidassembly structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The dampening assembly utilizes flexible printed circuit board (FPC) layers with conductive traces that provide both mechanical dampening and electrical connectivity. This thin-film approach achieves effective vibration dampening while maintaining a compact structure and avoiding significant increases in device complexity.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The dampening assembly employs composite construction combining FPC materials, conductive layers, and dampening structures to achieve multiple functions (mechanical support, electrical connectivity, and vibration dampening) in a single integrated component, thereby minimizing the increase in device complexity.

Inventive Principle:

Principle #40Composite materials

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

The solution effectively reduces reading and writing errors by accurately detecting shock events and differentiating them from lower amplitude disturbances, enabling corrective measures to maintain data integrity.

Implementation Method 1

A dampening assembly is positioned between the actuator assembly and the vibration sensor assembly, using a flex circuit with conductive layers and a stiffener to dampen vibration amplitudes

Methodology Applied

Scientific EffectVibration dampening: Damping

Implementation Method 2

a vibration sensor with specific bandwidth resonance to accurately sense multidirectional vibrations

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS9905273B2Methods and devices for detecting shock events

Publication Date: 2018.02.27 SEAGATE TECH LLC

AI summary

An apparatus includes an actuator assembly, a dampening assembly coupled to the actuator assembly, and a vibration sensor assembly coupled to the dampening assembly and coupled to the actuator assembly by way of the dampening assembly. A method includes attaching a dampening assembly to an actuator assembly and attaching a vibration sensor assembly to the dampening assembly. The dampening assembly is positioned between the vibration sensor assembly and the actuator assembly.