Transparent Holding Table Foreign Object Exclusion
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Solution Overview
Problem
In processing apparatuses with transparent holding tables, scratches or contamination on the surface can interfere with accurate imaging of workpieces, leading to deteriorated detection results.
Innovation Solution
A method and apparatus that involves imaging and identifying foreign objects on the transparent part of the holding table, then excluding these objects from the imaging of the workpiece, using separate cameras for table imaging and workpiece imaging, and optionally processing the images to remove foreign object artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transparent part is used in the holding table to enable imaging from the lower side, then imaging capability is improved, but detection accuracy deteriorates due to scratches and contamination appearing in the taken image
Solution Approach 1:
The imaging process is segmented into two separate steps: first imaging the transparent part to detect foreign objects, then imaging the workpiece while excluding the foreign object positions. This segmentation allows the system to maintain the transparent part's imaging capability while eliminating its harmful effects on detection accuracy.
Solution Approach 2:
The system performs preliminary imaging of the transparent part to identify foreign objects before imaging the workpiece. By detecting scratches and contamination in advance, the system can exclude these areas from the subsequent workpiece imaging process, preventing detection errors.
2Loss of information
If imaging is executed through the transparent part to capture workpiece information, then processing position identification is enabled, but detection results deteriorate due to foreign objects on the transparent surface
Solution Approach 1:
The system extracts and removes the harmful effect of foreign objects from the imaging process. By identifying foreign object positions in the transparent part image and excluding these positions when imaging the workpiece, the system eliminates the interference caused by scratches and contamination while preserving the useful information for processing position identification.
Solution Approach 2:
The transparent part serves as an intermediary that enables workpiece imaging from the lower side, but it also introduces foreign objects that interfere with detection. The system uses the transparent part's imaging capability as a mediator to detect foreign objects first, then uses this information to guide the subsequent workpiece imaging process.
3Device complexity
If a single imaging system is used for both transparent part and workpiece, then device complexity is reduced, but imaging quality deteriorates due to foreign object interference
Solution Approach 1:
The imaging system dynamically adjusts its operation mode based on the imaging target. The same imaging device executes different imaging sequences: first imaging the transparent part to detect foreign objects, then imaging the workpiece while excluding foreign object positions. This dynamic operation maintains imaging quality without requiring separate hardware systems.
Data Source
AI summary
There is provided a method for executing processing for a workpiece. The method includes a table imaging step of imaging a foreign object of a transparent part of a holding table having the transparent part composed of a transparent member at least in part of a holding surface and forming a foreign object taken image, a holding step of holding the workpiece by the holding table after executing the table imaging step, a workpiece imaging step of imaging the workpiece held by the holding table through the transparent part and forming a workpiece taken image, and a processing step of executing cutting for the workpiece held by the holding table by a cutting unit.