HGA Testing System with Selective Power and Short Detection

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Solution Overview

Problem

Testing of head-gimbal assemblies (HGAs) for data storage devices, such as hard disk drives, often causes damage to components and consumes significant time, as existing methods lack efficient and simultaneous testing capabilities for multiple HGAs.

Innovation Solution

A testing system that mechanically and electrically connects multiple HGAs simultaneously, using conductors for electrical coupling and switches to selectively apply voltage or current sources, along with a short detection assembly to identify electrical shorts, allowing for efficient characterization and functionality verification of HGA components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple HGAs are tested simultaneously using existing methods, then testing throughput is improved, but component damage risk increases and testing complexity increases

Engineering Contradiction:

Improvetesting throughputVSAvoidcomponent damage risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The testing system divides the HGA testing into separate functional modules: a voltage source module, a current source module, and a short detection module. Each module can be selectively activated for specific testing phases, allowing multiple HGAs to be tested simultaneously without overwhelming any single component, thereby reducing damage risk while maintaining high throughput

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically switches between different testing modes (voltage source mode, current source mode, short detection mode) based on the specific testing requirements of each HGA. This dynamic adaptability allows the system to optimize testing parameters for each component in real-time, reducing the risk of damage while maintaining efficient testing throughput

Inventive Principle:

Principle #15Dynamics

2Loss of time

If multiple HGAs are tested simultaneously, then testing time is reduced, but testing system complexity increases

Engineering Contradiction:

Improvetesting timeVSAvoidtesting system complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The testing station is designed as a universal platform that can handle multiple HGA types and testing scenarios through a single integrated system. The same physical infrastructure (conductor connections, mechanical positioning) supports both voltage source testing, current source testing, and short detection functions, reducing overall system complexity while enabling parallel testing of multiple HGAs

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system introduces a controller as an intermediary between the various testing modules and the HGAs. This controller manages the coordination between multiple simultaneous testing operations, handling the complexity of managing multiple conductors, voltage sources, and current sources through centralized control logic, thereby reducing the operational complexity for users

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If voltage source or current source is applied to test HGAs, then functionality verification is improved, but electrical short detection difficulty increases

Engineering Contradiction:

Improvefunctionality verificationVSAvoidelectrical short detection difficulty

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The system performs short detection as a preliminary testing step before applying full voltage or current sources for functionality verification. By detecting electrical shorts in advance using a dedicated short detection module, the system identifies problematic HGAs before they can be damaged during full functionality testing, thereby maintaining reliability while simplifying the overall testing process

Inventive Principle:

Principle #10Preliminary action

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 system enables rapid and damage-reduced testing of multiple HGAs by selectively applying power sources and detecting electrical shorts, ensuring component functionality while minimizing risk to the components, thereby improving testing efficiency and throughput.

Implementation Method 1

The testing station includes conductors for electrically coupling to conductive pads of the HGAs

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

detecting a resistance between the first conductive path and the other conductive paths

Methodology Applied

Scientific EffectElectrical resistance measurement: Electrical Resistance

Data Source

PatentUS11391787B2HGA circuitry testing systems, methods, and devices

Publication Date: 2022.07.19 SEAGATE TECH LLC

AI summary

A system includes a voltage source, a current source, and a testing station. The testing system is arranged to mechanically and electrically connect to multiple head gimbal assemblies (HGAs) simultaneously, and the testing station includes conductors for electrically coupling to conductive pads of the HGAs. The system further includes memory containing instructions for causing a computing device to connect either the voltage source or the current source to the conductors corresponding to each of the HGAs to be connected to the testing station.