Magnetic Head Heater Segmentation for Protrusion Control
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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 heat distribution issues, where components other than the main pole are also heated, leading to reduced effectiveness in reducing the distance to the recording medium and controlling the protrusion accurately.
Innovation Solution
The magnetic head design includes a heater received within a receiving space in the main pole, allowing efficient heating of the main pole while minimizing heat transfer to other components, thereby increasing the main pole's protrusion while suppressing protrusion of surrounding parts, ensuring the end face of the main pole protrudes maximally and maintaining control over the distance to the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a heater is provided within an insulating layer near the main pole to heat the main pole, then the end face of the main pole protrudes, but components other than the main pole are also heated, reducing the effectiveness of protrusion control
Solution Approach 1:
The heater is segmented into multiple heating regions with different heating powers. A first heating region is positioned adjacent to the end face of the main pole with higher heating power, while a second heating region is positioned adjacent to the side face with lower heating power. This segmentation allows selective heating of different portions of the main pole to achieve precise protrusion control without excessive heating of other components.
Solution Approach 2:
Different regions of the heater are assigned different heating powers based on their spatial relationship to the main pole. The region closer to the end face receives higher power to maximize protrusion, while the region closer to the side face receives lower power to minimize unwanted heating of surrounding components. This local quality differentiation resolves the contradiction between achieving protrusion and avoiding harmful heat transfer.
2Length of stationary object
If the heater heating power is increased to achieve greater protrusion, then the main pole protrudes more, but other components are excessively heated, making it difficult to control the distance to the recording medium
Solution Approach 1:
The heater is divided into multiple heating regions with independently controllable heating powers. This allows the system to apply higher heating power to the region adjacent to the end face to achieve greater protrusion, while simultaneously applying lower heating power to the region adjacent to the side face to prevent excessive heating of other components, thereby maintaining accurate distance control.
Solution Approach 2:
The heating power parameter is differentiated across different regions of the heater. By changing the heating power parameter locally rather than uniformly, the system achieves both greater main pole protrusion and accurate distance control, resolving the contradiction between protrusion magnitude and control accuracy.
3Manufacturing precision
If the heater is positioned to maximize main pole heating, then protrusion is increased, but heat transfer to surrounding components increases, reducing reading capability
Solution Approach 1:
The heater is segmented into a first heating region adjacent to the end face and a second heating region adjacent to the side face. The first region uses higher heating power to maximize end face protrusion, while the second region uses lower heating power to minimize heat transfer to surrounding components, thereby preserving reading capability while achieving the desired protrusion.
Solution Approach 2:
Different local regions of the heater are assigned different heating qualities (power levels) based on their functional requirements. The region near the end face receives high-quality heating for protrusion, while the region near the side face receives low-quality heating to protect surrounding components, resolving the contradiction between protrusion amount and reading capability.
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 enhances recording density by efficiently heating the main pole, allowing greater protrusion of the end face while preventing excessive heating of other components, thus achieving precise control over the distance to the recording medium and maintaining reading capability with higher density recording.
Implementation Method 1
a heater for heating the main pole
Implementation Method 2
heating the main pole to allow the end face of the main pole to protrude
Data Source
AI summary
A magnetic head includes a main pole and a heater for heating the main pole. The main pole is shaped to have a receiving space formed therein for receiving at least part of the heater. The at least part of the heater is received in the receiving space. The main pole includes a first layer and a second layer stacked. The receiving space is sandwiched between the first layer and the second layer.