Resonant Channel for Head-to-Disc Contact Vibration Sensing
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Solution Overview
Problem
Existing mass storage devices face challenges in quickly sensing head-to-disc contact vibrations due to background vibration noise spectra produced by disc motors, which interfere with accurate tracking and data writing, leading to potential data loss.
Innovation Solution
A channel system that includes a suspension system and a vibration sensor with modal resonances spaced apart from local noise maxima, allowing for effective sensing and amplification of head-to-disc contact vibrations to interrupt write current and adjust head spacing, thereby preventing data overwrite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vibration sensor is used to sense head-to-disc contact vibrations, then the sensing capability is improved, but the signal-to-noise ratio deteriorates due to background vibration noise maxima
Solution Approach 1:
The patent applies resonance by tuning the vibration sensor's natural frequency to match the suspension system's resonance frequency, which is positioned between the noise maxima. This resonance amplification enhances the sensor's response to head-to-disc contact vibrations while avoiding the noisy frequency regions, thereby improving measurement precision without sacrificing signal-to-noise ratio
Solution Approach 2:
The patent changes the operating frequency parameter of the vibration sensor by selecting a resonance frequency that lies between the local noise maxima. This parameter selection optimizes the signal-to-noise ratio by positioning the sensing operation in a frequency region with minimal background noise while maintaining adequate sensing capability
2Measurement precision
If the suspension system and sensor are tuned to resonate at high frequencies, then the vibration sensing sensitivity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the suspension system and vibration sensor into an integrated resonant system where the sensor is mounted on the suspension assembly. By coupling these components and tuning them to share a common resonance frequency, the patent achieves enhanced vibration sensing sensitivity while avoiding the need for separate complex tuning mechanisms for each component
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 channel system enhances signal-to-noise ratio and accurately senses head-to-disc contact vibrations, preventing data loss by interrupting write current and maintaining a stable magnetic air gap for reading and writing.
Implementation Method 1
The suspension system has a suspension modal resonance that is spaced apart in frequency from the first and second local maxima. The vibration sensor has a sensor modal resonance that is spaced apart in frequency from the first and second local maxima. The sensor modal resonance overlaps with the suspension modal resonance.
Data Source
AI summary
A channel senses head-to-disc contact vibrations in a vibrational noise spectrum produced in a mass storage device. The channel includes a suspension system with a suspension modal resonance. The channel includes a vibration sensor that senses head-to-disc contact vibrations through the suspension system. The vibration sensor has a sensor modal resonance that overlaps the suspension modal resonance.