Magnetic Head Heater Isolation for Pole Protrusion
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Solution Overview
Problem
Conventional magnetic heads with heaters struggle to achieve sufficient protrusion of the main pole's end face for high recording density due to heating of components other than the main pole, leading to inefficient distance reduction and control issues.
Innovation Solution
A magnetic head design where the heater is isolated from the return path section and positioned between the main pole and a metal portion, allowing efficient heating of the main pole while minimizing heating of other components, thereby increasing the end face protrusion without affecting neighboring parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a heater is provided near the main pole to heat it, then the end face of the main pole protrudes and the distance to the recording medium is reduced, but other components of the write head unit are also heated causing them to protrude as well
Solution Approach 1:
The heater is segmented into multiple heating regions with different heating powers. A first heater portion heats the main pole with higher power to achieve significant protrusion, while a second heater portion heats other components with lower power to prevent excessive protrusion. This segmentation allows independent control of heating for different components.
Solution Approach 2:
Different regions of the heater are assigned different heating characteristics. The first heater portion positioned near the main pole provides strong localized heating, while the second heater portion positioned near other components provides gentler heating. This local quality differentiation enables precise control over which components protrude and by how much.
2Temperature
If the heater is positioned close to the main pole to efficiently heat it, then the main pole protrudes significantly, but neighboring components also heat up and protrude
Solution Approach 1:
The heater is divided into spatially separated heating portions. The first heater portion is positioned to directly heat the main pole, while the second heater portion is positioned to heat other components. This spatial segmentation allows targeted heating of the main pole without excessively heating neighboring components.
Solution Approach 2:
The first heater portion applies excessive heating to the main pole to ensure sufficient protrusion, while the second heater portion applies partial heating to other components to prevent excessive protrusion. The combination of partial and excessive action in different regions achieves the desired differential protrusion.
3Manufacturing precision
If other components are heated along with the main pole, then the distance reduction is achieved, but it becomes difficult to recognize and control the main pole's distance to the recording medium
Solution Approach 1:
The heater provides differentiated local heating quality: strong heating for the main pole to ensure it protrudes sufficiently, and weak heating for other components to keep them relatively stationary. This creates a clear positional relationship where the main pole is the primary protruding element, making it easier to recognize and control.
Solution Approach 2:
By segmenting the heater into portions that differentially heat the main pole versus other components, the system creates distinct thermal zones. This segmentation ensures that the main pole's position is uniquely determined by its heating zone, improving measurement and control precision.
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 design enables greater protrusion of the main pole's end face, enhancing recording density and allowing precise control of the distance to the recording medium, while preventing unwanted erasure and flux leakage.
Implementation Method 1
a heater for allowing the end face of the main pole located in the medium facing surface to protrude
Implementation Method 2
heating the main pole with a heater to allow the end face of the main pole to protrude
Implementation Method 3
The coil produces a magnetic field corresponding to data to be written on the recording medium. The main pole allows a magnetic flux corresponding to the magnetic field produced by the coil to pass
Data Source
AI summary
A magnetic head includes a main pole, a return path section, a heater for heating the main pole, and a metal portion. The metal portion is isolated from the return path section and disposed such that the heater is interposed between the main pole and the metal portion. The return path section has a contact surface in contact with the main pole. The metal portion is located farther from the medium facing surface than is the contact surface. The main pole and the metal portion define therebetween a receiving space for receiving at least part of the heater. The at least part of the heater is received in the receiving space.