Oscillator Circuit Shock Sensor Resonant Frequency Detection
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Solution Overview
Problem
Existing data storage devices, such as disk drives, face challenges in accurately detecting physical shocks affecting the head actuated over the disk, which can distort the position error signal and affect head positioning, necessitating improved shock sensing and compensation mechanisms.
Innovation Solution
The implementation of a shock sensor with a resonant frequency detection system using an oscillator circuit and a notch filter to compensate for physical shocks, enabling accurate detection and adjustment of the control signal applied to the voice coil motor for precise head positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shock sensor is used to detect physical shocks, then shock detection capability is improved, but the resonant frequency of the shock sensor can distort the position error signal and reduce measurement precision
Solution Approach 1:
An oscillator circuit is introduced as an intermediary component between the shock sensor and the position error signal processing system. The oscillator circuit detects the resonant frequency of the shock sensor and generates a reference signal that is fed back to adjust the shock sensor's operating characteristics, thereby eliminating the distortion of the position error signal while maintaining shock detection capability
Solution Approach 2:
The oscillator circuit implements a feedback mechanism where the resonant frequency detected from the shock sensor is used to generate a reference signal that is fed back to modify the shock sensor's response. This feedback loop continuously adjusts the system to compensate for resonant frequency distortions, ensuring accurate position error signal measurement while maintaining reliable shock detection
2Measurement precision
If the resonant frequency of the shock sensor is detected using an oscillator circuit, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The oscillator circuit is designed to serve multiple functions: it detects the resonant frequency of the shock sensor, generates a reference signal for feedback control, and provides timing information for the shock detection system. By making the oscillator circuit multi-functional, the patent reduces the need for separate dedicated components, thereby limiting the increase in device complexity while maintaining high measurement precision
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
This solution effectively detects and compensates for physical shocks, ensuring accurate head positioning and reducing errors by attenuating the resonant frequency of the shock sensor's output, thereby improving the reliability of data storage operations.
Implementation Method 1
an oscillator circuit 22 responsive to the shock sensor 20 and configured to generate an oscillating signal 24 using positive feedback
Implementation Method 2
a shock sensor 20 and an oscillator circuit 22 responsive to the shock sensor 20
Data Source
AI summary
A data storage device is disclosed comprising a disk, a head, a shock sensor, and an oscillator circuit responsive to the shock sensor and configured to generate an oscillating signal using positive feedback. A resonant frequency of the shock sensor is detected based on the oscillating signal. A physical shock affecting the head actuated over the disk is detected based on a response of the shock sensor to the physical shock and based on the detected resonant frequency of the shock sensor.