Lid Backside Inspection Through Side-Rotated Liquid Containers
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Solution Overview
Problem
Existing inspection systems struggle to capture foreign objects adhering to the back side of a container lid due to image quality degradation caused by bubbles and liquids, which affects the accuracy of detection.
Innovation Solution
An inspection system that rotates the container on its side and captures the back side of the lid using a camera with an optical axis parallel to the central axis, avoiding interference from the liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the container is inspected in an upright position with the camera below, then the back side of the lid can be captured, but the image quality deteriorates due to bubbles and liquid interference
Solution Approach 1:
The container is rotated from a static upright position to a dynamic horizontal position during inspection. This movement changes the spatial relationship between the camera, liquid, and lid, allowing the camera to capture the back side of the lid through the liquid-free region at the bottom of the container when viewed from the side
Solution Approach 2:
The inspection approach transitions from a vertical dimension (camera below capturing through liquid) to a horizontal dimension (camera at side capturing through liquid-free region). By rotating the container 90 degrees, the camera captures the back side of the lid through the bottom region which is free of liquid when the container is in horizontal position
2Measurement precision
If the container is rotated to a horizontal position, then the back side of the lid can be captured through the liquid-free region, but the inspection system complexity increases
Solution Approach 1:
The rotation mechanism serves multiple functions: it positions the container horizontally for side-view inspection, enables the camera to capture the back side of the lid through the liquid-free region, and can potentially facilitate other inspection angles. This multi-functionality justifies the added complexity by providing several benefits from a single mechanism
Data Source
AI summary
A system that inspects a container filled with liquid and sealed with a lid at an opening part thereof includes: a rotating unit that performs a first rotation process of setting the container in a posture laid on its side and rotating the container about a central axis of the container; and an acquiring unit that acquires an image obtained by capturing a back side of the lid through a region outside the liquid in the container from a side of a bottom part of the container being rotated with a camera having an optical axis parallel to the central axis.