Triaxial Acceleration Sensor Disk Protection Mechanism
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Solution Overview
Problem
Magnetic disk devices in electronic apparatuses are vulnerable to vibration and shock, which can cause the magnetic head and disk to collide, leading to damage, and existing solutions do not effectively address this issue.
Innovation Solution
Incorporating a triaxial acceleration sensor to detect fluctuations in the electronic apparatus and automatically retract the magnetic head based on detected acceleration, thereby preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic head is used to read/write data on a magnetic disk, then data storage and retrieval functions are achieved, but the magnetic head and disk are vulnerable to collision during vibration or shock
Solution Approach 1:
The magnetic head is retracted to a safe position before the vibration or shock can cause damage. The acceleration sensor detects incoming fluctuations and triggers head retraction in advance, preventing collision between the magnetic head and disk during harmful events
Solution Approach 2:
An acceleration sensor serves as an intermediary detection device that monitors vibration and shock conditions. The sensor detects harmful fluctuations and transmits signals to the control circuit, which then activates the magnetic head retraction mechanism to avoid direct damage
2Measurement precision
If a biaxial acceleration sensor is used to detect fluctuations, then basic vibration detection is achieved, but comprehensive fluctuation detection is limited
Solution Approach 1:
The detection system transitions from biaxial to triaxial acceleration sensing, adding the third spatial dimension to fluctuation detection. This enables comprehensive monitoring of vibrations and shocks from all three axes (X, Y, Z), providing complete spatial coverage and preventing any direction of harmful fluctuations from going undetected
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 triaxial acceleration sensor effectively protects the magnetic disk device by retracting the magnetic head during detected fluctuations, enhancing the robustness of the device against vibration and shock.
Implementation Method 1
a triaxial acceleration sensor detects various fluctuations
Data Source
AI summary
An electronic apparatus includes a body, a triaxial acceleration sensor which is built in the body and includes a long axis and a short axis, a disk device built in the body, a calculation unit that calculates a value on a basis of an acceleration value which is detected by the triaxial acceleration sensor and is output in a direction perpendicular to the long axis and to the short axis, a setting unit that sets a threshold in a state of the body in which a plane formed by the long axis and the short axis is approximately parallel to a direction of action of gravitational acceleration, and a controller that starts protection of the disk device on a basis of a result of comparison between the value calculated by the calculation unit and the threshold.