Dual-Surface Board Inspection Apparatus with Synchronous Scanning
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Solution Overview
Problem
Current inspection technologies for electronic boards require extended time to inspect both surfaces, as they rely on recognizing high-definition images, and there is a need for a more efficient method to reduce this inspection time.
Innovation Solution
An appearance inspection apparatus with multiple scanning units that scan both surfaces of the board in a single step, utilizing a first and second scanning unit that move relative to each other and the board, along with illuminating units for efficient illumination control, allowing for synchronous scanning and illumination to reduce optical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple scanning units are used to inspect both surfaces of the board, then inspection precision is improved, but inspection time increases
Solution Approach 1:
The patent combines multiple scanning units (first scanning unit for front surface, second scanning unit for back surface) into a single integrated inspection system that operates simultaneously. The scanning units are positioned to scan both surfaces of the board at the same time during a single relative movement, merging the inspection process into one coordinated operation rather than sequential operations.
Solution Approach 2:
The illumination units are positioned and configured in advance to provide optimal lighting for both surfaces before scanning begins. The system pre-arranges the scanning paths and relative movement trajectory to ensure both surfaces are captured in a single pass, eliminating the need for repeated scanning operations.
2Measurement precision
If high-definition imaging is used to inspect the board, then inspection precision is improved, but inspection time increases
Solution Approach 1:
The system merges high-definition imaging capabilities into multiple scanning units that operate in parallel. Instead of capturing high-definition images sequentially from different positions, the scanning units simultaneously capture high-resolution data from both surfaces during a single relative movement, maintaining image quality while reducing total inspection time.
3Object-affected harmful factors
If synchronous scanning and illumination are implemented, then optical interference is reduced, but device complexity increases
Solution Approach 1:
The illumination units are positioned and synchronized in advance with the scanning units. The system pre-configures the illumination timing and intensity to match the scanning trajectory, ensuring that light is provided exactly when and where needed during the relative movement. This preliminary arrangement minimizes optical interference without requiring complex real-time adjustments during operation.
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 significantly reduces the inspection time by enabling both surfaces to be scanned and inspected in a single step, improving inspection precision and speed while minimizing the adverse effects of optical interference.
Implementation Method 1
a first scanning unit which scans one surface of the inspection piece by being moved relative to the inspection piece; a second scanning unit which is provided opposite to the first scanning unit, sandwiching the inspection piece, and which scans the other surface of the inspection piece
Implementation Method 2
a first illuminating unit which illuminates the inspection piece in order for the first scanning unit to scan the inspection piece; and a second illuminating unit which illuminates the inspection piece in order for the second scanning unit to scan the inspection piece
Data Source
AI summary
A first imaging unit and a second imaging unit of an appearance inspection apparatus for inspecting a board scan one surface of the board by being moved relative to the board. A third imaging unit and a fourth imaging unit are provided opposite to the first imaging unit and the second imaging unit, sandwiching the board, and scan the other surface of the board by being moved relative to the board. A board transport motor moves the imaging units and the board relative to each other. Each of the imaging units completes scanning the board in a single step of movement for moving the board and the scanning units relative to each other.