Multichannel Tape Head With Non-Uniform Heating
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Solution Overview
Problem
The challenge in magnetic tape head systems is to prevent corrosion and maintain accurate track registration despite variations in tape expansion and humidity, which affects the alignment and performance of multichannel tape heads.
Innovation Solution
Incorporating a resistive heating element with a non-uniform resistance profile and an expansion control plate to induce thermal expansion and maintain uniform transducer spacing, while also using a thin film heating element to prevent corrosion by maintaining the tape head above the dew point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tape head is heated to prevent corrosion by maintaining above dew point, then corrosion prevention is improved, but transducer spacing uniformity deteriorates due to non-uniform thermal expansion
Solution Approach 1:
The heating element is designed with non-uniform resistance distribution, having higher resistance at the edges and lower resistance in the center. This creates non-uniform heating where the edges receive more heat than the center, compensating for the non-uniform thermal expansion of the substrate to maintain uniform transducer spacing.
Solution Approach 2:
The patent utilizes controlled thermal expansion of the substrate by applying non-uniform heating. The differential expansion caused by edge-heating compensates for the natural non-uniform expansion pattern, ensuring that transducer spacing remains uniform after heating to prevent corrosion.
2Manufacturing precision
If a uniform heating element is used to maintain transducer spacing, then spacing uniformity is improved, but corrosion prevention deteriorates because the heating cannot maintain above dew point effectively
Solution Approach 1:
The heating element employs non-uniform resistance distribution with higher resistance at edges and lower in center, creating localized heating patterns that simultaneously achieve uniform transducer spacing and effective corrosion prevention by maintaining the entire head above dew point.
3Ease of manufacture
If the heating element resistance is uniform, then manufacturing simplicity is improved, but track registration accuracy deteriorates due to non-uniform thermal expansion
Solution Approach 1:
The heating element is fabricated with deliberately non-uniform resistance distribution, having higher resistance at edges and lower in center. This non-uniform structure, while slightly more complex to manufacture, ensures uniform transducer spacing and accurate track registration by compensating for substrate expansion variations.
Solution Approach 2:
The non-uniform resistance profile creates controlled differential heating that compensates for non-uniform thermal expansion of the substrate, ensuring that transducer spacing remains uniform and track registration accuracy is maintained.
4Manufacturing precision
If edge regions are heated more than center, then transducer spacing uniformity is improved, but energy distribution worsens due to higher resistance at edges
Solution Approach 1:
The heating element uses non-uniform resistance distribution with higher resistance at edges and lower in center, creating optimized local heating patterns. This non-uniform energy distribution is deliberately designed to compensate for substrate expansion characteristics, achieving uniform transducer spacing despite unequal energy distribution across the heating element.
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 effectively prevents corrosion, maintains accurate track registration, and ensures reliable performance across varying environmental conditions by controlling temperature and expansion uniformly across the tape head.
Implementation Method 1
Incorporating a resistive heating element with a non-uniform resistance profile and an expansion control plate to induce thermal expansion and maintain uniform transducer spacing
Implementation Method 2
Incorporating a resistive heating element with a non-uniform resistance profile and an expansion control plate to induce thermal expansion and maintain uniform transducer spacing
Data Source
AI summary
In one embodiment, an apparatus includes a module having: an array of transducers formed in thin film structure on a substrate, the array being positioned along a tape bearing surface of the module, and a heating element positioned in the thin film structure and recessed from the tape bearing surface. An apparatus, according to another embodiment, includes a module having an array of transducers formed on a substrate, the array being positioned along a tape bearing surface of the module between skiving edges thereof. A slot is formed in the substrate adjacent one of the skiving edges. A heating element is positioned in the slot.