Working Apparatus Center Position Correction for Component Mounting
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Solution Overview
Problem
Existing component mounting apparatuses struggle to accurately move working mechanism portions to mounting positions when they are not aligned on a straight line passing through the centers of imaging portions, leading to inaccuracies in component placement.
Innovation Solution
A working apparatus with a head unit comprising first and second imaging portions and a working mechanism portion, where a control portion corrects the center position of the working mechanism based on displacement calculations and positional interrelations between the imaging portions and the working mechanism, allowing accurate movement even when not aligned on a straight line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the working mechanism portion is arranged at a position other than on the straight line passing through the centers of the first imaging portion and the second imaging portion, then the imaging portions can cover a wider area and capture more reference marks, but it becomes difficult to accurately grasp the amount of displacement of the working mechanism portion, leading to inaccurate movement to working positions
Solution Approach 1:
The patent introduces reference marks as intermediary objects arranged in a matrix pattern on the board. These reference marks serve as mediators between the imaging portions and the working mechanism portion, enabling the control portion to calculate the amount of displacement of the working mechanism portion indirectly through image processing of the reference marks, even when the working mechanism portion is not positioned on the straight line passing through the centers of the imaging portions.
Solution Approach 2:
The patent replaces direct mechanical positioning relationships with an optical measurement and computational system. Instead of relying on fixed mechanical alignment between the working mechanism portion and imaging portions, the system uses cameras to capture images of reference marks, processes these images computationally to determine displacement amounts, and applies correction values to achieve accurate positioning. This substitution of mechanical alignment with optical-computational methods enables flexible positioning while maintaining high precision.
2Manufacturing precision
If correction values for the working mechanism portion are calculated and stored for all possible positions, then positioning accuracy is improved, but the memory capacity required and the complexity of arithmetic processing increase significantly
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing only the correction values for the imaging portions (first and second imaging portions) in a correction table during system setup or calibration. These pre-calculated correction values are then reused during actual operations. The control portion calculates the amount of displacement of the working mechanism portion by combining the pre-stored imaging portion correction values with the measured displacement of the imaging portions, avoiding the need to pre-calculate and store correction values for all possible working mechanism positions.
Solution Approach 2:
The patent applies partial action by calculating correction values only for the imaging portions rather than for all possible working mechanism positions. The system stores correction values for a limited set of imaging portion positions (in a correction table) and uses these partial correction values in combination with real-time displacement measurements to derive the necessary corrections for the working mechanism portion, reducing memory requirements and computational complexity while maintaining accuracy.
Data Source
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AI summary
This working apparatus (100) for a component or a board includes a head unit (20) and a control portion (71). The control portion performs control of correcting the center position of a working mechanism portion on the basis of the first amount of movement displacement of the actual position coordinates of the center position of a first imaging portion with respect to the theoretical position coordinates of the center position of the first imaging portion, the second amount of movement displacement of the actual position coordinates of the center position of a second imaging portion with respect to the theoretical position coordinates of the center position of the second imaging portion, and the positional interrelation between the first imaging portion, the second imaging portion, and the working mechanism portion when moving the head unit.