Movable Board Imaging Correction Mark for Position Accuracy
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Solution Overview
Problem
Conventional component mounting apparatuses with movable board imaging portions face challenges in accurately recognizing board positions due to displacement errors caused by inertial forces and shaft elongation, leading to inaccurate conveyance position grasping.
Innovation Solution
Incorporating an imaging position correction mark on the head portion that allows the board imaging portion to correct its displacement relative to the head portion based on an image of the correction mark, ensuring accurate board recognition even when the imaging portion is movable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the board imaging portion is made movable relative to the head portion to enable board recognition, then the functionality for recognizing board position is improved, but displacement errors occur due to inertial forces and shaft elongation during movement, deteriorating measurement precision
Solution Approach 1:
The imaging position correction mark provides a feedback mechanism by capturing the actual position of the board imaging portion relative to the head portion. The control unit uses the captured image data to calculate displacement and correct position information, creating a closed-loop feedback system that compensates for movement errors.
Solution Approach 2:
The imaging position correction mark creates a visual copy or representation of the relative position between the board imaging portion and head portion. By capturing this mark with the board imaging portion itself, the system obtains a copied position reference that can be used to correct actual position measurements.
2Difficulty of detecting and measuring
If an encoder is used to detect the position of the movable board imaging portion, then position detection capability is improved, but position displacement occurs due to inertial force during rotation and shaft elongation from heat generation, worsening measurement accuracy
Solution Approach 1:
The imaging position correction mark serves as an intermediary reference object between the board imaging portion and the head portion. Instead of relying solely on the encoder's direct measurement, the system uses this visual intermediary to verify and correct position information, eliminating the need for complex encoder compensation mechanisms.
Solution Approach 2:
The system replaces reliance on mechanical encoder measurements with an optical/image-based position verification method. By using the board imaging portion to capture the correction mark and process the image data, the system substitutes mechanical position sensing with optical field-based measurement that is not subject to mechanical errors.
Data Source
AI summary
This component mounting apparatus includes a head portion capable of mounting a component suctioned by a nozzle on a board, a board imaging portion provided on the head portion to be movable relative to the head portion so as to image the board, and an imaging position correction mark provided in the head portion to be capable of being imaged by the board imaging portion and is configured to correct the displacement of the board imaging portion relative to the head portion on the basis of an image of the imaging position correction mark imaged by the board imaging portion.