PCB Layer Misalignment Control via Predictive Thresholds
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Solution Overview
Problem
The manufacturing process of Printed Circuit Boards (PCBs) faces significant challenges due to dimensional instability of layers, making it difficult to predict and control misalignments during the manufacturing process.
Innovation Solution
A computer program product and system that calculates layer misalignment between layers of an electrical circuit manufactured by a direct imaging device, selects a response based on allowable misalignment thresholds, and executes actions such as manufacturing additional layers, stopping the process, or amending the process to address misalignments, using automatic optical inspection tools and direct imaging devices to assess and correct layer alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dimensional stability of layers is improved, then manufacturing precision is improved, but device complexity increases due to need for control systems
Solution Approach 1:
The system performs preliminary calculation of expected layer misalignment before the layer is actually manufactured. By predicting the misalignment in advance based on previously manufactured layers and their cumulative misalignments, the system can prepare correction actions beforehand, reducing the need for complex real-time control during manufacturing.
Solution Approach 2:
The system implements a feedback mechanism where actual layer misalignments are measured and used to calculate expected misalignments for subsequent layers. This feedback loop allows the control system to continuously adjust and compensate for dimensional instabilities, improving manufacturing precision through iterative correction rather than requiring perfectly stable materials.
2Manufacturing precision
If real-time misalignment control is implemented, then manufacturing precision is improved, but productivity decreases due to additional inspection time
Solution Approach 1:
The system calculates expected layer misalignment in advance before the layer manufacturing is complete. By performing the misalignment prediction and control decision-making beforehand, the system minimizes interruption time during the actual manufacturing process, maintaining productivity while achieving precision control.
Solution Approach 2:
The system focuses inspection and control efforts on critical parameters and key layers rather than performing exhaustive measurements on every aspect of every layer. By concentrating control resources on the most impactful misalignment factors, the system achieves adequate precision without the productivity penalty of complete inspection.
3Manufacturing precision
If strict misalignment thresholds are enforced, then manufacturing precision is improved, but loss of time increases due to process stoppages
Solution Approach 1:
The system predicts expected layer misalignment before manufacturing completes, allowing operators to prepare corrective actions in advance. This preliminary assessment enables continuous process adjustment without unexpected stoppages, maintaining precision while minimizing time loss.
Solution Approach 2:
The system dynamically adjusts misalignment thresholds and control strategies based on the specific characteristics of each layer and the cumulative misalignment history. Rather than applying static, strict thresholds that cause frequent stoppages, the system adapts its control criteria to maintain precision while allowing acceptable variations that don't require process interruption.
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 controls the manufacturing process by detecting and addressing layer misalignments, reducing dimensional instability and ensuring that PCBs meet alignment thresholds, thereby improving the quality and reliability of the manufacturing process.
Implementation Method 1
a direct imaging device that exposes a photo-resistive material to radiation to provide a pattern
Data Source
AI summary
A method, system and computer program product for controlling a manufacturing process of an electronic circuit, the method includes: calculating at least one layer misalignment between layers of an electrical circuit that are expected to be mutually aligned; wherein the layers are manufactured by at least a direct imaging device that exposes a photo-resistive material to radiation to provide a pattern; selecting, in response to the at least one layer misalignment and in response to at least one allowable misalignment threshold, a selected response out of: manufacturing at least one additional layer of the electrical circuit; and stopping the manufacturing process of the electrical circuit; and participating in executing the selected response.