Plate Edge Inspection Using Side-Light Defect Detection
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Solution Overview
Problem
Existing surface-defect inspecting apparatuses struggle to detect defects on the side surfaces or corners of plate-like bodies, particularly those with coating materials on both sides, due to the obstruction caused by the coatings.
Innovation Solution
An apparatus is designed to inspect side surfaces of plate-like bodies with coating materials on both sides by using light emitting and receiving units, a conveying unit to vary the light position, and determining units to detect defects based on light reflection and distance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light source and one-dimensional CCD camera are disposed above the target substrate to inspect the top surface, then the top surface inspection is achieved, but the side surfaces and corners cannot be inspected due to obstruction by coating materials
Solution Approach 1:
The patent transitions from top-down inspection to side-surface inspection by positioning light sources and cameras at the sides of the plate-like body. This dimensional change allows light to illuminate and cameras to capture defects on vertical surfaces and corners that are inaccessible from the top view, thereby expanding inspection coverage without compromising detection precision.
Solution Approach 2:
The inspection system is divided into multiple independent inspection units, each equipped with its own light source and camera. These segmented units can be positioned at different locations around the plate-like body to inspect various surfaces including top, bottom, and side surfaces, thereby achieving comprehensive coverage that a single top-down unit cannot provide.
2Reliability
If coating materials are disposed on top and bottom sides of the plate-like body, then protection and aesthetic functions are achieved, but observation through top and bottom becomes impossible due to coating obstruction
Solution Approach 1:
Instead of attempting to inspect through the coating from the top or bottom, the patent inverts the inspection approach by examining the side surfaces where coating obstruction is minimal or nonexistent. This allows defect detection on critical areas like corners and edges without being blocked by the protective coating on top and bottom surfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively detects defects on the side surfaces and corners of plate-like bodies with coating materials, enhancing the inspection capabilities beyond the limitations of conventional systems.
Implementation Method 1
at least one light emitting unit configured to irradiate a side surface of a plate-like body with light; at least one light receiving unit configured to receive light reflected with respect to a side surface of a plate-like body
Data Source
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AI summary
An apparatus for inspecting plate-like bodies to inspect a side surface of a plate-like body with sheeted coating materials on a top side and bottom side of the plate-like body, is provided. The apparatus includes at least one light emitting unit configured to irradiate the side surface of the plate-like body with light. The apparatus includes at least one light receiving unit configured to receive light reflected with respect to the side surface of the plate-like body. The apparatus includes a conveying unit configured to move at least one among the light emitting unit and the plate-like body and to vary a position of the light on the side surface of the plate-like body, emitted by the light emitting unit. The apparatus includes a determining unit configured to determine whether the side surface of the plate-like body has a defect, by using the light emitted by the light emitting unit, upon occurrence of a condition under which the conveying unit varies the position of the light, on the side surface of the plate-like body, emitted by the light emitting unit.