Bond Pad Sharing for Magnetic Recording Head Writers
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Solution Overview
Problem
Magnetic recording heads face challenges in minimizing the number of bond pads while accommodating additional components, as increasing the bond pad count requires complex design changes and is costly, and sharing bond pads can lead to bias contention and performance degradation.
Innovation Solution
Implementing bond pad sharing between electrical components with similar biasing and filtering requirements, allowing existing bond pads to be shared between multiple components, thereby reducing the overall number of bond pads needed without degrading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bond pad count is increased to accommodate additional components, then the number of available components increases, but the design complexity and manufacturing cost increase
Solution Approach 1:
The patent implements bond pad sharing where a single bond pad serves multiple functions by being shared between different components (e.g., a bond pad shared between a writer and a heater). This multi-functionality approach allows the system to accommodate additional components without increasing the total bond pad count, thereby avoiding the design complexity and manufacturing cost increases that would result from adding more bond pads.
2Device complexity
If bond pads are shared between multiple components, then the number of bond pads is reduced, but bias contention and performance degradation occur
Solution Approach 1:
The patent employs dynamic biasing control where the bias voltage applied to shared bond pads is adjusted based on the operational state. When a bond pad is shared between a writer and a heater, the system dynamically switches the bias voltage to appropriate levels for the active component, preventing bias contention. This dynamic adjustment maintains performance stability while reducing the total number of bond pads through sharing.
3Adaptability or versatility
If the number of components is increased for heat-assisted magnetic recording, then the recording capability is improved, but the bond pad requirement increases
Solution Approach 1:
The patent implements bond pad sharing where a single bond pad serves multiple functions by being shared between different components (e.g., a bond pad shared between a writer and a heater). This multi-functionality approach allows the system to accommodate additional components without increasing the total bond pad count, thereby avoiding the design complexity and manufacturing cost increases that would result from adding more bond pads.
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 approach allows for the addition of more components without increasing the bond pad count, maintaining performance and reducing design complexity, which is particularly beneficial for heat-assisted magnetic recording and interlaced magnetic recording applications.
Implementation Method 1
At least one heater is coupled between two of the first, second, third, and fourth bond pads
Data Source
AI summary
A slider of a magnetic recording head comprises a plurality of electrical bond pads coupled to bias sources. A first writer on the slider is coupled between first and second bond pads. A second writer on the slider is coupled between third and fourth bond pads. At least one heater is coupled between two of the first, second, third, and fourth bond pads. The first writer can have a center-tap coupled to first and second bond pads. The second writer can have a center-tap coupled to third and fourth bond pads. A first writer heater can be coupled between the center-tap of the second writer and the ground pad. A second writer heater can be coupled between the center-tap of the first writer and the ground pad.