Magnetic Thin Film Recording Head Module Electrical Shielding
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Solution Overview
Problem
Crosstalk between read and write transducers in magnetic storage systems limits data density and requires separate modules for concurrent operation, leading to increased complexity, alignment issues, and higher costs.
Innovation Solution
Incorporating electrical shielding layers above arrays of read and write transducers to isolate their lead structures, allowing for a single module design with segregated pad areas that reduce crosstalk and enable concurrent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate modules are used for read and write transducers to avoid crosstalk, then crosstalk is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines read and write transducer arrays into a single integrated module rather than using separate modules. This merging approach maintains the ability to perform read-while-write operations while reducing overall device complexity and improving alignment between arrays.
Solution Approach 2:
The patent introduces electrical shielding layers as intermediary structures between the read and write transducer arrays. These shielding layers act as mediators that block capacitive and inductive coupling, thereby reducing crosstalk while allowing both arrays to coexist in a single module.
2Object-affected harmful factors
If separate modules are used for read and write transducers, then crosstalk is reduced, but alignment precision deteriorates
Solution Approach 1:
By merging both arrays into a single module fabricated on one wafer, the patent eliminates the alignment difficulties inherent in assembling separate modules. The arrays are positioned relative to each other with precise control during the wafer fabrication process.
Solution Approach 2:
The patent performs preliminary positioning of both read and write arrays during the wafer fabrication stage, before the module is completed. This preliminary action ensures precise alignment is built into the structure from the beginning, avoiding subsequent alignment issues.
3Object-affected harmful factors
If multiple separate modules are used, then crosstalk is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple transducer arrays into a single integrated module that can be fabricated in one wafer processing sequence. This eliminates the need for multiple separate post-wafer processing steps required when assembling separate modules.
Solution Approach 2:
The patent performs preliminary fabrication of all transducer arrays, leads, and shielding structures during the wafer fabrication process itself. This preliminary action consolidates multiple manufacturing steps into a single integrated process, simplifying production.
4Object-affected harmful factors
If electrical shielding layers are added between arrays, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The patent applies electrical shielding layers locally only in the regions where capacitive and inductive coupling occurs between adjacent leads of read and write arrays. This localized approach reduces crosstalk without adding shielding structures throughout the entire device, thereby minimizing added complexity.
Solution Approach 2:
The shielding layers serve as intermediary elements inserted between specific lead structures where coupling problems occur. They provide targeted isolation without requiring complete restructuring of the entire transducer array configuration.
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 single module design with electrical shielding effectively reduces crosstalk, simplifies fabrication, improves alignment, and decreases costs by allowing concurrent read-while-write operations without increasing power consumption or mechanical difficulties.
Implementation Method 1
A first electrical shielding layer is positioned above the first array of read transducers. An array of write transducers is positioned above the first electrical shielding layer. A second electrical shielding layer is positioned above the array of write transducers.
Data Source
AI summary
An apparatus, in accordance with one approach, includes a module having a first array of read transducers. A first electrical shielding layer is positioned above the first array of read transducers. An array of write transducers is positioned above the first electrical shielding layer. A second electrical shielding layer is positioned above the array of write transducers. A second array of read transducers is positioned above the second electrical shielding layer.