Flexible Slider Anti-Static Structure for Disk Drive ESD Protection
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Solution Overview
Problem
Conventional flexible mounting sliders in disk drive devices are prone to electrostatic discharge (ESD) during assembly due to the accumulation of static electricity, which can damage the read/write elements due to the lack of a proper grounding structure in the second insulation layer.
Innovation Solution
Incorporating an anti-static structure with an insulation plate, an anti-static plate, and a grounding element on the slider back surface, where the anti-static plate has an insulation layer and an anti-static layer made of semiconductor or metal material, allowing for electrostatic charge release through grounding before assembly, thereby preventing ESD from affecting the read/write elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second insulation layer is added to the slider structure to provide electrical insulation, then electrical insulation performance is improved, but electrostatic charge accumulates and causes electrostatic discharge that damages read/write elements
Solution Approach 1:
An anti-static layer is introduced as an intermediary between the second insulation layer and the slider body. This anti-static layer acts as a mediator that allows electrostatic charges to be discharged through the insulation structure without directly damaging the read/write elements, thus resolving the contradiction between maintaining electrical insulation and preventing electrostatic discharge damage.
Solution Approach 2:
The electrical properties of the slider structure are modified by adding an anti-static layer with specific electrical characteristics. This layer changes the overall electrical parameter profile of the slider, enabling it to maintain insulation while providing a controlled path for static charge dissipation, thereby preventing ESD damage to sensitive components.
2Reliability
If the second insulation layer is made thicker to enhance insulation, then electrical insulation is improved, but electrostatic charge accumulation increases and grounding becomes more difficult
Solution Approach 1:
The anti-static layer serves as an intermediary grounding mechanism that simplifies the overall grounding structure. Instead of requiring complex grounding arrangements for thick insulation layers, the anti-static layer provides a direct charge dissipation path, reducing grounding structure complexity while maintaining effective insulation.
3Productivity
If conventional slider assembly process is used to simplify manufacturing, then manufacturing efficiency is improved, but electrostatic discharge during assembly damages read/write elements
Solution Approach 1:
The anti-static layer is incorporated into the slider structure during manufacturing as a preliminary protective measure. This preliminary action ensures that the slider is inherently protected against electrostatic discharge during the assembly process, allowing conventional assembly procedures to continue without modification while maintaining read/write element integrity.
Solution Approach 2:
The anti-static layer provides beforehand cushioning against electrostatic discharge by offering a controlled charge dissipation path before any potential ESD event can occur during assembly. This prior protection mechanism allows efficient assembly operations without compromising the reliability of sensitive read/write elements.
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 anti-static structure effectively prevents electrostatic discharge during the assembly process, ensuring the safety and integrity of the slider's read/write elements by releasing accumulated electrostatic charges before assembly, thus protecting the components from potential damage.
Implementation Method 1
it is very easy for the second insulation layer 152 to rub with the outside surroundings, thus accumulating a large amount of electrostatic charges... generating electrostatic discharge (ESD) which will cause the current flow through the slider read/write elements
Data Source
AI summary
A flexible mounting slider with anti-static structure includes a slider body, an anti-static structure and a lead layer. The slider body includes an ABS, a slider back surface opposite to the ABS and a trailing edge connected with the ABS and the slider back surface. The trailing edge forms a plurality of slider pads thereon. The anti-static structure is provided on the slider back surface, which includes an insulation plate formed on the slider back surface, an anti-static plate formed on the insulation plate and a grounding element. In the invention, the anti-static plate comprises an insulation layer and an anti-static layer. The grounding element is electrically contacting with the anti-static layer of the anti-static plate and the slider back surface simultaneously. The lead layer is sandwiched between the insulation plate and the insulation layer of the anti-static plate and electrically connected with the slider pads of the slider body.