Fiducial Mark Reference for Mounting Head Component Detection
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Solution Overview
Problem
Existing mounting machines face inefficiencies in detecting the holding state of moving components due to positional shifting during imaging, requiring analysis of larger image data ranges and increased processing time.
Innovation Solution
The use of a fiducial mark as a reference to set a smaller processing region for image data analysis, accounting for the size and positional shifting of the component, allowing for efficient detection of the holding state without considering the mounting head's positional shifting, and transferring only the necessary image data for processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the component is imaged while moving to reduce mounting process time, then productivity is improved, but the image data range must be enlarged to account for positional shifting, increasing processing time
Solution Approach 1:
The fiducial mark serves as an intermediary reference object attached to the mounting head. By detecting the fiducial mark's position first, the system establishes a reference frame that enables accurate component position detection without requiring analysis of the entire image range, thus maintaining fast processing while imaging moving components
Solution Approach 2:
The system performs preliminary detection of the fiducial mark position before processing component detection. This preliminary action establishes the mounting head's position reference, allowing subsequent component position calculations to be performed efficiently on a reduced processing region rather than the full image
2Reliability
If the processing region is enlarged to account for mounting head positional shifting, then detection reliability is improved, but the processing time increases
Solution Approach 1:
The fiducial mark acts as a mediator that decouples the mounting head position variability from the component detection process. By referencing component positions relative to the detected fiducial mark rather than absolute image coordinates, the system maintains detection reliability without requiring enlarged processing regions
Solution Approach 2:
The system applies different processing strategies to different regions: the fiducial mark detection uses the full image range to ensure accurate reference establishment, while component detection uses a localized processing region defined relative to the fiducial mark position, optimizing both reliability and processing efficiency
3Measurement precision
If all captured image data is transferred for processing, then detection accuracy is maintained, but data transfer amount and processing time increase
Solution Approach 1:
The image data processing is segmented into two stages: first, the fiducial mark is detected in the full image to establish reference coordinates; second, only the component region of interest (defined relative to the fiducial mark) is extracted and processed for component position detection. This segmentation reduces data transfer while maintaining detection precision
Solution Approach 2:
The system performs preliminary processing to detect the fiducial mark and define the component processing region before transferring data for component detection. This preliminary action enables selective data transfer of only the necessary processing region rather than the entire captured image
Data Source
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Figure 3(a)~3(b)
AI summary
In a mounting machine 11, out of the captured image data 90 of the fiducial mark and component P sucked by the moving mounting head 24, a processing region containing a component P is set, based on position of fiducial mark, and a state of the component P which is sucked by the mounting head 24 is detected by processing image data of the set processing region. Generally, when the moving mounting head 24 is imaged, there is a case in which shifting arises in the position of the mounting head 24. In this mounting machine 11, since it is possible to ascertain the position of the mounting head 24 without shifting, using the fiducial mark of the mounting head 24 as a reference, it is possible to set the processing region in which the component P is anticipated to be contained in the image to a smaller region which does not take the positional shifting amount of the mounting head 24 into consideration.