HDD Humidity Sensor Micro-Actuator Flying Height Control
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Solution Overview
Problem
Hard disk drives face reliability issues due to the impact of ambient humidity on the air gap between the slider and the rotating disk surface, which affects magnetic spacing and flying height, leading to reduced performance and accuracy in data access.
Innovation Solution
Incorporating a humidity sensor within the hard disk drive to measure relative humidity and adjust the vertical position of the slider using a micro-actuator, allowing for real-time compensation of humidity changes and maintaining optimal flying height through a humidity estimate and temperature consideration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a humidity sensor is added to measure and compensate for humidity changes, then reliability and flying height control are improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing a humidity sensor to detect humidity parameter changes within the drive, and using a micro-actuator to adjust the slider's vertical position parameter in response to detected humidity changes, thereby maintaining optimal flying height despite environmental variations
Solution Approach 2:
The patent implements feedback control by continuously monitoring humidity levels with a humidity sensor and using this information to dynamically adjust the slider position via a micro-actuator, creating a closed-loop system that compensates for humidity-induced flying height changes
2Manufacturing precision
If the vertical position of the slider is adjusted in real-time based on humidity, then flying height control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from a static slider position to a dynamic, adjustable position system. A micro-actuator is integrated into the slider assembly, enabling real-time vertical position adjustments in response to humidity changes, making the flying height adaptive rather than fixed
Solution Approach 2:
The patent introduces a micro-actuator as an intermediary device between the humidity sensor and the slider. This intermediary component translates humidity detection signals into precise mechanical position adjustments, enabling controlled flying height changes without directly modifying the slider structure
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 enhances the reliability and accuracy of data access by maintaining optimal flying height and magnetic spacing, even under varying humidity conditions, thereby improving the overall performance of the hard disk drive.
Implementation Method 1
A humidity sensor within the hard disk drive measures a relative humidity
Implementation Method 2
A flying height control is asserted to a vertical micro-actuator coupled to the slider to alter the vertical position of the slider over the rotating disk surface
Implementation Method 3
The servo controller first positions the read-write head by electrically stimulating the voice coil motor, which couples through the voice coil and an actuator arm to move a head gimbal assembly
Implementation Method 4
They often use an electrostatic effect and/or a piezoelectric effect to rapidly make fine position changes
Implementation Method 5
They often use an electrostatic effect and/or a piezoelectric effect to rapidly make fine position changes
Data Source
AI summary
Hard Disk Drive (HDD) including a humidity sensor. Humidity sensor communicating with embedded circuit to provide humidity reading to alter flying height control asserted to control vertical positioning of slider above disk surface. Method operating HDD using humidity sensor and apparatus implementing method. Methods of manufacturing embedded circuit and HDD, and their products.