PCB Component Placement Accuracy via Multi-Sensor Feedback
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Solution Overview
Problem
Conventional surface-mount equipment lacks feedback mechanisms to ensure accurate component placement on printed circuit boards (PCBs), particularly for fine-pitch components, leading to issues like inadequate soldering or solder bridging, and there is no effective method to verify proper insertion of high-pin-count chips in sockets.
Innovation Solution
Incorporating alignment marks on components and reference marks on target platforms, along with multi-sensor probes, to detect deviations and provide feedback for precise placement, using techniques such as resistance, capacitance, or optical probing to ensure accurate alignment and contact status monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional surface-mount equipment is used without feedback mechanisms, then the placement process is simple and fast, but the placement accuracy deteriorates leading to inadequate soldering or solder bridging
Solution Approach 1:
The patent implements feedback mechanisms through alignment marks on components and reference marks on target platforms, combined with multi-sensor probes that detect deviations and provide real-time feedback for precise placement correction
Solution Approach 2:
The patent replaces conventional mechanical probing with optical probing techniques, using light-based sensors to detect alignment marks and determine component placement accuracy, thereby improving precision without excessive mechanical complexity
2Volume of moving object
If pin pitch is reduced to limit package size growth, then the device can maintain compact dimensions, but the placement accuracy requirement increases making accurate placement more difficult
Solution Approach 1:
The feedback system using alignment marks and multi-sensor probes detects even minor placement deviations, enabling correction that ensures accurate placement despite reduced pin pitch dimensions
Solution Approach 2:
The patent introduces alignment marks as additional reference features beyond the component body itself, creating a new dimensional reference system that enables precise placement measurement and correction
3Manufacturing precision
If alignment marks and multi-sensor probes are incorporated, then placement accuracy is improved and feedback is provided, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses optical probing techniques instead of complex mechanical measurement systems, simplifying the manufacturing process while maintaining high precision through non-contact optical detection of alignment marks
4Loss of information
If conventional placement methods are used without monitoring, then the process is fast and simple, but the ability to detect improper insertion or contact status is lost
Solution Approach 1:
The multi-sensor probes provide real-time feedback on component insertion status and contact quality by detecting alignment marks and measuring electrical continuity, ensuring proper assembly without excessive complexity
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 enhances placement accuracy, reduces rework, and allows for the use of physically out-of-specification components, improving yield and enabling precise assembly of high-density components without soldering, especially for devices with ultra-fine contact pitches and high pin counts.
Implementation Method 1
using techniques such as resistance, capacitance, or optical probing to ensure accurate alignment and contact status monitoring
Implementation Method 2
using techniques such as resistance, capacitance, or optical probing to ensure accurate alignment and contact status monitoring
Implementation Method 3
using techniques such as resistance, capacitance, or optical probing to ensure accurate alignment and contact status monitoring
Data Source
AI summary
The present invention relates generally to assembly techniques. According to the present invention, the alignment and probing techniques to improve the accuracy of component placement in assembly are described. More particularly, the invention includes methods and structures to detect and improve the component placement accuracy on a target platform by incorporating alignment marks on component and reference marks on target platform under various probing techniques. A set of sensors grouped in any array to form a multiple-sensor probe can detect the deviation of displaced components in assembly.