Slider Actuator Segmentation for Head-Media Spacing Control
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Solution Overview
Problem
Current data storage systems face challenges in precisely controlling the spacing between the head and media in hard disc drives, particularly in achieving reliable write and read operations due to limitations in head-media spacing control, where a single heater for thermal expansion is insufficient for both localized write operations and contact detection, leading to potential damage and errors.
Innovation Solution
A slider with two actuators, where a first actuator provides localized thermal expansion for writing and a second actuator creates a larger protrusion for contact detection, both powered through a single electrical connection, allowing for precise control of head-media spacing without increasing the number of electrical contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single heater is used for thermal expansion to control head-media spacing, then the structure is simple, but it cannot simultaneously provide localized write control and reliable contact detection
Solution Approach 1:
The single heater is divided into two separate actuators: a first actuator for localized thermal expansion near the writer for write operations, and a second actuator for creating a larger protrusion for contact detection. This segmentation allows each actuator to be optimized for its specific function while maintaining overall system reliability in controlling head-media spacing.
Solution Approach 2:
The first actuator is positioned to provide localized thermal expansion specifically near the writer for precise write control, while the second actuator creates a larger protrusion for contact detection. Each actuator is strategically placed to address specific local requirements, with the first actuator providing fine-grained control for writing and the second actuator providing broader detection capability.
2Measurement precision
If a larger protrusion area is used for contact detection, then contact detection reliability improves, but localized write operation precision deteriorates
Solution Approach 1:
The contact detection function is separated from the write control function by using distinct actuators. The second actuator creates a larger protrusion specifically for contact detection, while the first actuator provides localized thermal expansion for write operations. This functional segmentation allows each function to be optimized independently without compromising the other.
Solution Approach 2:
The first actuator is positioned to provide localized thermal expansion specifically near the writer for precise write control, while the second actuator creates a larger protrusion for contact detection. Each actuator is strategically placed to address specific local requirements, with the first actuator providing fine-grained control for writing and the second actuator providing broader detection capability.
3Manufacturing precision
If multiple electrical contacts are used to control multiple actuators, then control precision improves, but device complexity and manufacturing cost increase
Solution Approach 1:
A single electrical contact on the slider body is used to control both the first actuator and the second actuator. The power source can selectively operate each actuator through the coupling element, allowing one electrical contact to serve multiple functions. This multi-functionality reduces the number of electrical contacts while maintaining the ability to precisely control both actuators for localized write operations and contact detection.
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 enables reliable and precise control of head-media spacing, minimizing the risk of damage and improving data storage accuracy by using separate actuators for writing and contact detection, while reducing the number of electrical contacts and maintaining mechanical and electrical performance.
Implementation Method 1
electrically heating the head, which causes thermal expansion of the head and modifies the head media spacing
Implementation Method 2
electrically heating the head, which causes thermal expansion of the head and modifies the head media spacing
Data Source
AI summary
A slider having a slider body is provided. An electrical connection is coupled to the slider body. A first actuator is coupled to the electrical connection and adapted to displace a first portion of the slider body. Additionally, a second heater is coupled to the electrical connection and adapted to displace a second portion of the slider body.