Non-Contact MLCC Defect Detection via Laser Resonance
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Solution Overview
Problem
Existing methods for detecting defective multilayer ceramic capacitors (MLCCs) are inefficient due to the need for expensive high-frequency transducers, limited accuracy, and the requirement for inspections to be performed in water, as well as the inconvenience of needing a conducting part in specific positions, which can lead to undetected defects or electrical performance deterioration.
Innovation Solution
A device and method using a non-contact energy source to generate mechanical resonance in electronic components, allowing for the detection of defects through vibration analysis without direct contact or specialized environments, enabling the identification of internal cracks and delamination regardless of their location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-frequency transducer is used to detect various types of defects, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical ultrasonic transducer system with an optical detection system. Specifically, it uses a laser to generate acoustic waves and a laser interferometer to detect vibrations, substituting mechanical contact-based ultrasonic inspection with non-contact optical methods. This eliminates the need for complex high-frequency transducers while maintaining defect detection capability.
Solution Approach 2:
The patent introduces water as an intermediary medium to transmit acoustic waves generated by the laser to the MLCC component. The water couples the acoustic energy from the laser to the component without requiring direct mechanical contact, enabling defect detection while simplifying the detection system architecture.
2Measurement precision
If ultrasonic inspection is performed in water, then measurement precision is improved, but ease of operation deteriorates due to environmental restrictions
Solution Approach 1:
The patent makes the detection system universally applicable by enabling inspections in both water and air environments. The optical-based system with laser interferometry can detect vibrations and acoustic waves regardless of the surrounding medium, eliminating the restriction to water-only inspections while maintaining detection accuracy through adaptive measurement techniques.
3Measurement precision
If an electrode is disposed in a specific position to detect internal cracks, then measurement precision is improved, but ease of operation deteriorates due to positioning requirements
Solution Approach 1:
The patent replaces the electrical electrode-based detection method with an optical system. A laser generates acoustic waves that propagate through the MLCC component, and a laser interferometer detects the resulting vibrations without requiring any physical electrodes or conducting parts to be positioned on the component. This eliminates all positioning requirements while maintaining internal defect detection capability.
Solution Approach 2:
The MLCC component itself serves as the detection target without requiring additional electrodes or conducting layers. The component's inherent acoustic properties and vibration characteristics are utilized directly by the laser-based system, eliminating the need for external electrical connections or special preparations.
4Productivity
If electrical performance inspection is used, then productivity is improved, but measurement precision deteriorates for detecting internal defects
Solution Approach 1:
The patent uses mechanical vibration detection through laser interferometry to identify internal defects. By generating acoustic waves with a laser and detecting the component's vibration response, the system can quickly identify defects such as cracks and delamination while maintaining high inspection speed suitable for production environments.
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 provides a cost-effective, high-accuracy method for detecting defective electronic components, including small defects, without damaging them, and allows for quick and convenient inspection of multiple components, improving detection efficiency and reducing the risk of electrical performance deterioration.
Implementation Method 1
an energy source that generates energy and transfers the generated energy to a plurality of electronic components in a non-contact manner to make the plurality of electronic components vibrate
Implementation Method 2
a mechanical resonance detector that detects vibration resonances of the plurality of electronic components
Data Source
AI summary
A device and method use a heat source to generate heat energy and transfer the generated thermal energy to a plurality of electronic components in a non-contact manner through air to cause the plurality of electronic components to vibrate simultaneously. The device and method use a mechanical resonance detector to detect vibration resonances of the plurality of electronic components simultaneously. The device and method use a post-processing processor to compare the detected vibration resonances of the plurality of electronic components with a reference vibration resonance of a normal product to simultaneously determine whether the plurality of electronic components have defective electronic components.