Tunable Microstrip Signal Transmission Path in Hard Disk Drive
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Solution Overview
Problem
Current compensation networks in hard disk drives, which often include capacitors or inductors, are impractical due to their size and cost, making it difficult to achieve optimal signal transfer in the limited space of the hard disk drive layout.
Innovation Solution
The implementation of tunable microstrip transmission paths, where non-terminated signal pathways are used to achieve a desired impedance level, reducing impedance and improving signal transfer by optimizing the layout and using conductive substrate islands for further impedance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compensation networks with capacitors or inductors are used, then signal transfer can be optimized, but the device complexity and physical space requirements increase significantly
Solution Approach 1:
The patent extracts the compensation function from separate discrete components (capacitors and inductors) and integrates it directly into the transmission line structure itself. The microstrip transmission line is designed with specific geometric parameters (width, spacing, substrate properties) that provide the necessary impedance transformation and signal compensation internally, eliminating the need for external compensation network components.
Solution Approach 2:
The microstrip transmission line structure performs multiple functions simultaneously: it serves as both the signal transmission pathway and the impedance compensation mechanism. By carefully designing the microstrip geometry (conductor width, substrate thickness, dielectric constant), the same structure that transmits the signal also provides the necessary impedance matching and signal integrity optimization, combining what were previously separate functions into one universal element.
2Reliability
If capacitive or inductive compensation components are added, then signal transfer improves, but the area occupied in the physical layout increases
Solution Approach 1:
The patent merges the compensation function with the transmission line structure by designing the microstrip geometry itself to provide impedance compensation. The conductor trace width, spacing from reference planes, and substrate properties are engineered to create the desired impedance characteristics, combining signal transmission and impedance control into a single integrated structure that occupies minimal space.
Solution Approach 2:
The patent achieves impedance compensation by changing the geometric parameters of the microstrip transmission line. By adjusting conductor width, trace spacing, substrate thickness, and dielectric constant, the characteristic impedance of the transmission line is optimized to provide signal compensation without adding discrete components. This parameter-based approach allows precise control of electrical characteristics within the available physical space.
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 lowers signal impedance within the gimbal area, enhancing signal transfer efficiency while minimizing the physical space required, thus overcoming the limitations of conventional compensation networks.
Implementation Method 1
A first suspension electrical interconnect is configured to electrically couple a first signal conducting pathway with the slider and with a first non-terminated signal pathway. A second suspension electrical interconnect is configured to electrically couple a second signal conducting pathway with the slider and with a second non-terminated signal pathway.
Implementation Method 2
The length of the second non-terminated signal pathway is selected to achieve a desired impedance level
Data Source
AI summary
A disk pack, comprising at least one hard disk, is rotatably mounted to a housing. The disk pack defines an axis of rotation and a radial direction relative to the axis. At least one actuator mounted to the housing is coupled with a suspension and is movable relative to the disk pack. A slider, comprising a slider body and a head configured to read data from and write data to at least one hard disk, is coupled with the suspension. A first suspension electrical interconnect is configured to electrically couple a first signal conducting pathway with the slider and with a first non-terminated signal pathway. A second suspension electrical interconnect is configured to electrically couple a second signal conducting pathway with the slider and with a second non-terminated signal pathway. The length of the second non-terminated signal pathway is selected to achieve a desired impedance level.