Disk Device Magnetic Head Asymmetric Trailing End Flexure Clearance
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Solution Overview
Problem
The existing disk devices face challenges in stably adjusting the position of magnetic heads due to potential contact with the flexure, which affects the accuracy and reliability of data reading and writing operations.
Innovation Solution
The implementation of a disk device design that includes a magnetic head, a piezoelectric element, and a flexure with a specific electrode configuration, where the piezoelectric element deforms to change the distance between electrodes, allowing the magnetic head to swing and adjust its position without contacting the flexure, thereby maintaining steadiness and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piezoelectric element swings the magnetic head to adjust its position, then the position adjustment capability is improved, but the magnetic head may contact with the flexure causing instability
Solution Approach 1:
The magnetic head is designed with an asymmetric configuration where the trailing end extends beyond the flexure surface in the radial direction, creating a gap that prevents contact. This asymmetric design allows the head to swing for position adjustment while the trailing end clearance ensures no contact with the flexure, resolving the contradiction between positioning accuracy and stability.
Solution Approach 2:
The solution addresses the contact issue by utilizing the radial dimension (thickness direction) to create clearance. By extending the trailing end of the magnetic head beyond the flexure surface in the radial direction, the invention transforms a potential one-dimensional contact problem into a three-dimensional clearance solution, allowing swinging motion without contact.
2Volume of moving object
If the magnetic head is positioned closer to the flexure for compact design, then device compactness is improved, but contact risk increases reducing reliability
Solution Approach 1:
The asymmetric design of the magnetic head, with the trailing end extending beyond the flexure surface, creates a directional clearance that maintains reliability while allowing compact overall device design. This asymmetric configuration ensures the head can be positioned close to the flexure without risking contact during swinging operations.
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 design enhances the steadiness of magnetic head positioning, preventing contact with the flexure and improving the accuracy and reliability of data operations on the magnetic disk.
Implementation Method 1
The piezoelectric element includes a first electrode and a second electrode spaced apart from the first electrode. The second part swings with respect to the first part by deformation of the piezoelectric element which changes a distance between the first electrode and the second electrode.
Data Source
AI summary
According to one embodiment, a disk device includes a magnetic head, a piezoelectric element and a flexure. The piezoelectric element includes two electrodes. The flexure includes a first part and a second part that swings. The first part has a first surface to which a first electrode is joined. The second part has a second surface to which the magnetic head is joined. The magnetic head has a third surface facing the first surface and the second surface. The first electrode is spaced apart from a second electrode in a first direction. The first surface and an end of the third surface face each other. The second surface and another end of the third surface face each other. A distance between the first surface and the one end of the third surface is longer than a distance between the second surface and the other end of the third surface.