Segmented Vertical Conductive Structures for PCB Signal Transmission
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Solution Overview
Problem
The increasing demand for higher circuit density and speed in printed circuit boards (PCBs) is hindered by the limitations of traditional vias, including large surface area and yield issues due to smaller drill sizes and thicker PCBs, which complicate plating and manufacturing processes.
Innovation Solution
The implementation of vertical conductive structures with electrically isolated segments, formed by creating slots and conductive layers on the substrate, allowing for reduced surface area and improved plating efficiency, enabling more compact and efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional vias are used for layer-to-layer interconnection, then electrical connection between layers is achieved, but the surface area of vias becomes too large for new generations of components and pushing the limits down in hole size causes yield issues in drilling, cleaning, and plating
Solution Approach 1:
The via structure is segmented into multiple electrically isolated conductive segments within a single via hole, allowing each segment to be independently plated and processed. This segmentation enables the via to maintain electrical connectivity while reducing the surface area requirements and improving manufacturing yield by addressing yield issues in drilling, cleaning, and plating processes.
Solution Approach 2:
The patent transitions from traditional planar via structures to three-dimensional vertical conductive structures with multiple segments arranged vertically within the via hole. This dimensional change allows for reduced surface area while maintaining electrical connectivity, and enables independent plating of each segment to improve manufacturing reliability.
2Productivity
If more than one independent signal path or connection is provided in a single via to meet increased circuit density demand, then circuit density is improved, but the via surface area becomes too large and manufacturing complexity increases
Solution Approach 1:
Multiple independent signal paths are achieved by segmenting the via into multiple electrically isolated conductive segments, each capable of carrying independent signals. This segmentation allows high circuit density without proportionally increasing via surface area, as all segments share a single via hole structure, thereby reducing overall manufacturing complexity.
Solution Approach 2:
A single via structure serves multiple functions by accommodating multiple independent signal paths through its segmented conductive segments. This multi-functionality allows the via to handle increased circuit density requirements while maintaining a compact form factor and simplified manufacturing process.
3Area of moving object
If smaller drill sizes are used to reduce via surface area, then component compatibility is improved, but yield issues increase in drilling, cleaning, and plating processes
Solution Approach 1:
The via is divided into multiple conductive segments that can be independently plated, allowing the use of smaller drill sizes for each segment while maintaining overall manufacturing yield. The segmented structure enables targeted plating of each segment, compensating for the difficulties associated with smaller drill sizes in drilling, cleaning, and plating processes.
Solution Approach 2:
The patent changes the geometric parameters of the via structure by creating multiple smaller conductive segments within a single via hole, rather than using a single large via. This parameter change allows for reduced surface area and improved component compatibility while maintaining manufacturing yield through independent processing of each segment.
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 reduces the complexity of plating systems, increases yield, and decreases costs by providing a more efficient method for signal transmission with minimal distortion, even in high-density areas.
Implementation Method 1
a conductive layer is deposited on the sidewalls of the slot
Data Source
AI summary
Methods for producing a printed circuit board and printed circuit boards are disclosed, including a method in which a slot is formed in a substrate, the substrate having at least three layers with the slot extending through at least two of the layers. The slot has a length and a width with the length being greater than the width. The sidewall of the substrate surrounding the slot is coated with a conductive layer. The conductive layer is separated into at least two segments that are electrically isolated along the side wall of the substrate.