Electronic Component Inspection With Sensor-Guided Focus Control
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Solution Overview
Problem
Existing visual inspection systems for electronic components face challenges in achieving high inspection accuracy due to variations in component positioning and focus adjustment, leading to potential defects like cracks and scratches being missed.
Innovation Solution
A processing apparatus with a circular orbit transport system, integrated imaging unit, focus adjustment mechanism, and position sensor to ensure precise positioning and focus on the inspection surface of electronic components, enabling high-resolution imaging and detection of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a rotating body with support portions is used to transport electronic components through a circular orbit, then the inspection process can be automated and components can be positioned at imaging locations, but variations in component positioning and focus adjustment occur, reducing inspection accuracy
Solution Approach 1:
A position sensor detects the actual position of the inspection surface of the electronic component, and this position information is fed back to a focus adjustment unit. The focus adjustment unit then adjusts the focus of the imaging unit based on the detected position, creating a closed-loop feedback system that compensates for positioning variations and maintains high inspection accuracy throughout the automated circular orbit transport process.
Solution Approach 2:
The system transitions from a static focus setting to a dynamic focus adjustment mechanism. The focus adjustment unit actively modifies the focus of the imaging unit in real-time based on the detected position of the inspection surface, allowing the system to adapt to positioning variations that occur during automated transport through the circular orbit.
2Device complexity
If the imaging unit uses a fixed focus setting, then the system structure is simple, but inspection accuracy decreases due to positioning variations of electronic components
Solution Approach 1:
The position sensor continuously monitors the inspection surface position and provides feedback to the focus adjustment unit. This feedback mechanism enables the system to automatically compensate for positioning variations without requiring complex mechanical positioning systems, thereby maintaining inspection accuracy while keeping the overall structure relatively simple.
Solution Approach 2:
The system replaces complex mechanical positioning mechanisms with a sensor-based detection and software-controlled focus adjustment system. Instead of using precision mechanical stages to maintain component position, the system uses a position sensor to detect variations and adjusts focus through electronic control, simplifying the mechanical structure while maintaining or improving inspection accuracy.
3Measurement precision
If the focus of the imaging unit is adjusted dynamically based on position detection, then inspection accuracy improves, but the device complexity increases due to additional components
Solution Approach 1:
The position sensor and focus adjustment unit form a feedback control system that automatically maintains inspection accuracy. The position sensor detects the inspection surface position, and the focus adjustment unit adjusts the imaging unit focus accordingly. This feedback mechanism improves inspection accuracy while adding only minimal device complexity compared to fixed-focus systems.
Data Source
AI summary
A processing apparatus for an electronic component includes a component holding portion that holds an electronic component, a support portion that supports the component holding portion such that the component holding portion is located on a circular orbit passing through a predetermined inspection position, a transport drive unit that rotates the support portion about a central axis of the circular orbit, an imaging unit that is configured to image an inspection surface of the electronic component held by the component holding portion disposed at the inspection position, a position sensor that acquires position information indicating a position of the inspection surface, and a focus adjustment unit that adjusts a focus of the imaging unit on the inspection surface.