Offset Reader Stacks With Middle Shield For Magnetic Stability
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Solution Overview
Problem
Current hard disk drives face challenges in increasing data density and areal density with single read/write heads, as they struggle to effectively utilize multiple read transducers for improved data reading and writing capabilities.
Innovation Solution
The implementation of offset top and bottom reader stacks with a middle shield and side shields, along with a preamplifier and leads, allows for multiple read transducers to be used in a stacked configuration, enhancing data reading and writing capabilities by providing magnetic and electrical stability while minimizing downtrack spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple read transducers are used in a stacked configuration to increase data density, then areal density and data reading capability are improved, but magnetic stability and alignment precision deteriorate due to interference between stacked transducers
Solution Approach 1:
A middle shield is introduced between the top and bottom reader stacks to act as an intermediary element. This middle shield includes a common electrical conductive path that is magnetically coupled to both reader stacks, serving as a mediator to provide magnetic bias and stabilize the magnetic fields of both transducers, thereby reducing magnetic interference and improving magnetic stability
Solution Approach 2:
The middle shield serves multiple functions simultaneously: it provides magnetic bias to both top and bottom reader stacks through magnetic coupling, acts as an electrical conductive path for signal transmission, and functions as a shielding element to reduce crosstalk between the stacked transducers. This multi-functionality allows a single component to address multiple aspects of the technical contradiction
2Productivity
If multiple read transducers are stacked to improve data reading capability, then productivity is improved, but manufacturing precision is worsened due to difficulty in aligning multiple stacked components
Solution Approach 1:
The middle shield combines multiple functions into a single integrated component: it provides electrical connection to both reader stacks through its common conductive path, provides magnetic bias to both stacks, and serves as a structural reference for alignment. By merging these functions into one component rather than using separate elements, the manufacturing process is simplified and alignment precision is improved
Solution Approach 2:
The middle shield acts as a mediator component that facilitates the coupling between top and bottom reader stacks. Its common electrical conductive path serves as a reference structure that helps maintain precise alignment between the stacked transducers, making the manufacturing process more controllable and precise
3Device complexity
If top and bottom reader stacks are offset in downtrack direction to minimize spacing, then device complexity is reduced, but manufacturing precision is worsened due to difficulty in maintaining precise offset alignment
Solution Approach 1:
The middle shield with its common electrical conductive path serves as a universal reference structure that simultaneously provides electrical connection, magnetic bias, and alignment reference for both offset reader stacks. This multi-functional design simplifies the overall device structure while maintaining precise offset alignment, as the middle shield acts as a common reference for both stacks
Solution Approach 2:
The middle shield acts as an intermediary reference structure that facilitates the offset configuration of the reader stacks. The common conductive path in the middle shield provides a stable reference that helps maintain precise downtrack offset alignment between the top and bottom stacks, reducing the complexity of achieving and maintaining the offset 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
This configuration enables increased data density and areal density by allowing multiple read transducers to operate effectively, improving data reading and writing efficiency and stability, while maintaining precise alignment and magnetic stability.
Implementation Method 1
The middle shield includes a common electrical conductive path magnetically coupled to the top and bottom reader stacks
Implementation Method 2
The top and bottom reader stacks are magnetically biased via top and bottom side shields that surround the respective top and bottom reader stacks
Data Source
AI summary
A reader includes top and bottom reader stacks that are offset relative to each other in a downtrack direction and disposed between a top shield and a bottom shield. Top side shields surround the top reader stack in a crosstrack direction, and bottom side shields surround the bottom reader stack in the crosstrack direction. A middle shield is between the top and bottom reader stacks and the top and bottom side shields. The middle shield includes a common electrical conductive path coupled to the top and bottom reader stacks. A middle lead is coupled to an edge of the middle shield.