VCSEL Light Outlet Detection via Optical Imaging
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Solution Overview
Problem
Conventional methods for detecting defective light outlets in VCSEL chips, which may emit no light or flash irregularly, lack accuracy in distinguishing between normal and defective light emitting elements.
Innovation Solution
A light emitting element detecting method and equipment that uses an image capturing device, a probe module, and a control module to capture images of light outlets by generating control signals to open and close the shutter and pulse signals to illuminate the elements, allowing for accurate determination of light emitting status through image analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional probe methods are used to detect light emission, then the detection process is simple, but the accuracy in distinguishing normal and defective light outlets is insufficient
Solution Approach 1:
The patent replaces the conventional mechanical probe-based detection system with an optical imaging system. Instead of using physical probes to stimulate and detect light emission, the invention uses an image capturing device (camera) to capture images of the light outlets, combined with a light source to illuminate the chip. This substitution of mechanical detection with optical imaging significantly improves measurement precision while reducing mechanical complexity.
Solution Approach 2:
The patent introduces an intermediary illumination system (light source) between the object being tested and the detection device. The light source provides controlled illumination to the VCSEL chip, enabling the image capturing device to clearly capture the light emission status of individual light outlets. This intermediary lighting system acts as a mediator that enhances the detectability of light emission patterns without directly contacting the chip.
2Measurement precision
If multiple detection images are captured and compared to detect flashing light outlets, then the detection accuracy improves, but the detection time increases
Solution Approach 1:
The patent employs periodic action by capturing multiple detection images at different time points and comparing them to identify flashing light outlets. The system captures images periodically and uses image comparison algorithms to detect light outlets that exhibit intermittent emission patterns. This periodic imaging approach improves flash detection accuracy by observing temporal variations in light emission.
Solution Approach 2:
The patent creates multiple copies (detection images) of the light outlet emission patterns at different time points. By capturing and comparing these image copies, the system can identify temporal variations in light emission that indicate flashing defects. The image copying and comparison process enables accurate detection of intermittent emission without requiring continuous real-time monitoring.
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
Enables precise detection of light outlets with issues such as no light or flashing, improving the accuracy of identifying defective VCSEL chips by comparing multiple detection images and determining light intensity within predetermined standards.
Implementation Method 1
an image capturing device for capturing an image toward at least one light outlet of a light emitting element
Data Source
AI summary
A light emitting element detecting method includes the steps of generating a first control signal to open a shutter of an image capturing device which captures an image toward a light outlet of a light emitting element, generating a pulse signal to light up the light emitting element, generating a second control signal to close the shutter of the image capturing device and obtaining a detection image, and determining the light emitting status of the light outlet of the light emitting element according to the detection image. As a result, the present invention can accurately detect whether the light outlet of the light emitting element has the problem of emitting no light or flashing.