Magnetic Head Heater Coil Width Variation for Protrusion Control
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Solution Overview
Problem
Conventional magnetic heads with heaters face inefficiencies in achieving sufficient protruding distances due to low heater efficiency, leading to potential collisions and durability issues from excessive heating.
Innovation Solution
A magnetic head design featuring a heater coil with a wide terminal pattern outside the write coil facing area and a narrower heater pattern within, utilizing high-resistance materials like tungsten and titanium tungsten, to efficiently transmit heat and control clearance through thermal expansion, minimizing adverse temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the amount of heater power distribution is increased to achieve sufficient protruding distance, then the protruding distance is improved, but the temperature increases too much causing migration of the heater coil or heat influence to read/write elements, deteriorating durability and performance
Solution Approach 1:
The heater coil pattern is designed with different widths in different regions: a narrow heater pattern in the write coil facing area for efficient heat transmission, and wide terminal patterns outside this area for low-resistance connections. This local differentiation allows sufficient protruding distance with reduced overall power distribution, preventing excessive temperature rise and protecting read/write elements from heat damage.
Solution Approach 2:
The heater coil is strategically positioned and dimensioned to provide sufficient heating effect only in the critical write coil facing area, rather than uniformly heating the entire head structure. This partial action achieves the required protruding distance with minimal total power, avoiding excessive temperature rise in non-critical regions.
2Loss of energy
If conventional heater coil design is used, then the structure is simple, but the heater efficiency is low requiring increased power distribution which causes adverse effects
Solution Approach 1:
The heater coil pattern is designed with different widths in different regions: a narrow heater pattern in the write coil facing area for efficient heat transmission, and wide terminal patterns outside this area for low-resistance connections. This local differentiation allows sufficient protruding distance with reduced overall power distribution, preventing excessive temperature rise and protecting read/write elements from heat damage.
Solution Approach 2:
The resistance distribution of the heater coil is optimized by varying the pattern width: narrow sections in the write coil facing area provide high resistance for efficient heat generation, while wide terminal patterns provide low resistance for efficient power delivery. This parameter optimization maximizes heater efficiency and minimizes energy loss, reducing the need for excessive power distribution.
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
Enhances heater efficiency, reduces the risk of collisions, and maintains durability by efficiently controlling the protruding distance and distributing heat effectively, thereby optimizing the flying height and performance of the magnetic head.
Implementation Method 1
a heater coil which causes a medium facing surface to protrude toward a recording medium side by thermal expansion caused by power distribution and overheating
Implementation Method 2
power distribution and overheating
Data Source
AI summary
A magnetic head is composed of a write head (38) which magnetically records information by emitting magnetic flux, which is generated by a write coil (54), from a magnetic pole unit (50, 52) to a recording medium (14); and a read head (36) having a reading element which converts record magnetic flux, emitted from the recording medium (14), to an electrical signal. In an area facing a thin-film coil pattern of the write coil (54), a heater coil (60), which causes a medium facing surface to protrude toward the recording medium (14) by thermal expansion caused by power distribution and overheating, is disposed via an insulating layer. In the heater coil (60), a wide terminal pattern (66-1, 66-2) is disposed outside the write coil facing area, and a heater pattern having a width narrower than the terminal pattern is disposed in the area facing the write coil (54).