Disk Device Piezoelectric Bonding Protrusion Barrier
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Solution Overview
Problem
In disk devices like hard disk drives, the bonding material used to attach piezoelectric elements to flexures can spread unintentionally to non-corresponding electrodes, leading to potential short-circuits and unstable electrical characteristics.
Innovation Solution
The use of conductive adhesives as bonding materials, along with protrusions on the flexure that restrict the spread of these adhesives, ensures precise bonding between the piezoelectric elements and the flexure pads, preventing unwanted contact with other electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bonding material is pressed between piezoelectric element and flexure to ensure strong bonding, then bonding strength is improved, but bonding material may spread to non-corresponding electrodes causing short-circuits
Solution Approach 1:
The bonding area is segmented into multiple isolated regions by protrusions on the flexure. Each protrusion acts as a barrier that divides the bonding material into separate zones, preventing it from spreading continuously across the flexure surface to non-corresponding electrodes while still allowing sufficient bonding material to be pressed for strong bonding at each designated location.
Solution Approach 2:
The protrusions on the flexure serve as intermediary structures between the bonding material and the non-corresponding electrodes. These protrusions physically intervene to block the bonding material from reaching unintended areas, thereby preventing short-circuits while allowing the bonding material to perform its bonding function at the intended locations.
2Area of stationary object
If bonding material is spread to ensure complete coverage and strong bonding, then bonding area is improved, but bonding material may reach non-corresponding electrodes
Solution Approach 1:
The flexure surface is segmented into multiple isolated bonding regions by protrusions. This segmentation allows the bonding material to be distributed across multiple designated areas for complete coverage, while the protrusions act as barriers that prevent the material from spreading continuously to non-corresponding electrodes.
Solution Approach 2:
The protrusions create local variations in the flexure surface, forming distinct bonding zones with different properties. Each protrusion region allows bonding material to accumulate and bond locally, while the spaces between protrusions prevent material from reaching non-corresponding electrodes, thus providing localized bonding quality.
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 prevents short-circuits and maintains stable electrical characteristics in disk devices by ensuring controlled and precise bonding of the piezoelectric elements, thereby enhancing the reliability and performance of the disk device.
Implementation Method 1
piezoelectric elements that adjust the magnetic heads in position by deforming the flexures
Data Source
AI summary
According to one embodiment, a disk device includes a magnetic disk, a magnetic head, a flexure, a piezoelectric element, a first bonding material, a second bonding material, and a protrusion. The flexure includes a first outer surface, a first pad, and a second pad. The first pad and the second pad are on the first outer surface. The piezoelectric element includes a second outer surface, a first electrode, and a second outer surface. The first electrode and the second electrode are on the second outer surface. The first bonding material, which is conductive, bonds the first pad and the first electrode. The second bonding material, which is conductive, bonds the second pad and the second electrode. The protrusion is provided on the flexure, is located at least partially between the first bonding material and the second bonding material, and protrudes from the first outer surface.