Slider Laser Protection Layer for Transducer Shielding
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Solution Overview
Problem
The challenge in hard disk drive technology is the damage to read/write transducers during the laser bonding process, which affects the positional control and performance due to the transparency of the coat layer allowing high-energy laser beams to potentially harm the sensitive transducers.
Innovation Solution
A protection layer with reflectivity is integrated into the slider's coat layer or directly on the transducer to shield it from laser damage during bonding, preventing heat shock and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent coat layer is used to cover the read/write transducer, then the transducer is protected from magnet leakage, but the transducer becomes vulnerable to laser beam damage during the bonding process
Solution Approach 1:
An opaque protection layer is introduced as an intermediary between the transparent coat layer and the laser beam. This protection layer specifically covers the read/write transducer area and blocks laser radiation during the bonding process, preventing heat shock and damage to the transducer while allowing the transparent coat layer to continue providing magnet leakage protection.
Solution Approach 2:
The protection layer is applied locally only to the regions requiring laser protection (the read/write transducer and surrounding areas), rather than covering the entire slider. This selective application maintains the transparency and laser permeability needed in other areas of the slider while providing targeted protection where the transducer is located.
2Object-affected harmful factors
If a protection layer is added to shield the transducer from laser damage, then the transducer is protected during bonding, but the slider structure becomes more complex
Solution Approach 1:
The protection layer is integrated with the existing coat layer structure, forming a multi-layer coating system. The protection layer is deposited directly over the transparent coat layer in a sequential manufacturing process, merging the protective functions into a unified multi-layer structure rather than adding a separate component.
Solution Approach 2:
The slider coating system becomes a composite structure with multiple layers having different optical and magnetic properties. The transparent coat layer (e.g., alumina) provides magnet leakage protection, while the opaque protection layer (e.g., chromium oxide, tantalum oxide, or tungsten oxide) provides laser protection, creating a functionally composite material system.
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 protection layer effectively reflects the laser beam, safeguarding the read/write transducer and enhancing the reading and writing performance of the slider, thereby improving the overall disk drive unit's performance.
Implementation Method 1
a protection layer for shielding the read/write transducer thereby preventing the read/write transducer from damaging during a laser soldering process
Data Source
AI summary
A slider includes a substrate having a trailing edge, a leading edge opposite the trailing edge, and an air bearing surface connecting the trailing edge with the leading edge; a read/write transducer formed at the trailing edge; and a coat layer attached on the trailing edge and covering on the read/write transducer. The slider further includes a protection layer for shielding the read/write transducer thereby preventing the read/write transducer from damaging during a laser soldering process. The present invention can prevent the read/write transducer from damaging during the laser bonding process and, in turn improve the reading and writing performance of the slider. The invention also discloses an HGA and a disk drive unit.