Breakable Panel Mechanical Integrity Sensor for PCB Strain Detection
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Solution Overview
Problem
Printed circuit board assemblies are prone to strain-induced failures due to out-of-tolerance forces such as deflection, torque, or shock, leading to damage like cracked solder joints and intermittent connections, which can reduce device yield and profitability.
Innovation Solution
A mechanical integrity sensor with a light-blocking container and a breakable panel that fractures when an out-of-tolerance force is applied, allowing light to be collected by a sensor, which is used to detect and record such forces without the need for power, enabling preventive actions like powering down the component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical integrity sensor with a breakable panel is used to detect out-of-tolerance forces, then the ability to detect damage is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex electrical sensing systems with a simple mechanical-optical system. A breakable panel (mechanical element) that fractures under out-of-tolerance forces allows light to pass through to a light collector, creating a reliable damage detection mechanism without requiring power or complex electronics. This substitution resolves the contradiction by achieving reliable detection through a simpler mechanical-optical approach rather than complex electrical systems.
2Measurement precision
If electrical sensing methods are used to detect forces on circuit boards, then measurement precision can be achieved, but the system requires power which may not be available in all environments
Solution Approach 1:
The mechanical integrity sensor is self-activating and requires no external power source. The breakable panel automatically fractures when subjected to out-of-tolerance forces, and this mechanical action directly allows light to reach the light collector, generating the detection signal without requiring power. This self-service mechanism resolves the contradiction by providing force detection capability in environments where power may not be available, while maintaining measurement precision through the optical detection system.
3Reliability
If the breakable panel is designed to fracture at low force thresholds, then early damage detection is improved, but the sensor becomes more sensitive to normal handling forces
Solution Approach 1:
The patent enables adjustment of the breakable panel's fracture threshold through parameter changes in the panel's material properties, thickness, or geometric configuration. By carefully selecting these parameters, the panel can be designed to fracture at force levels that indicate actual damage while remaining resilient to normal handling forces. This parameter optimization resolves the contradiction by achieving early damage detection without excessive sensitivity to benign forces.
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
Effectively detects and records out-of-tolerance forces on printed circuit boards, preventing further damage and ensuring product integrity, even in environments where direct electrical sensing is not feasible, thereby enhancing reliability and profitability.
Implementation Method 1
The breakable panel fractures with a force on the breakable panel indicative of the out-of-tolerance force on the component
Data Source
AI summary
Mechanical integrity sensors are provided to detect occurrence of an out-of-tolerance force on a component, such as a circuit board. The mechanical integrity sensor includes a light-blocking container and a light collector disposed within the light-blocking container. The light-blocking container includes a breakable panel. The breakable panel fractures with a force on the breakable panel indicative of the out-of-tolerance force on the component. Fracturing of the breakable panel allows light into the light-blocking container, and the light is collected by the light collector as indicative of the occurrence of the out-of-tolerance force on the component.