Sheet Inspection Device Multi-Function Light Source
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Solution Overview
Problem
Conventional sheet inspection devices require a large number of components and space due to the need for separate light sources and detectors for front and back surfaces, as well as a transmission light source and detector, leading to increased costs and maintenance steps.
Innovation Solution
A sheet inspection device configuration where a single second light source for the back surface also functions as a hole inspection light source, and the first inspection part for the front surface also functions as a hole inspection part, reducing the number of necessary components by using the same light sources and inspection parts for both surface defects and holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate light sources and detectors are provided for front surface inspection, back surface inspection, and hole inspection, then inspection accuracy is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent applies multi-functionality by making the first inspection part serve dual purposes: inspecting front surface defects using reflected light from the first light source, and detecting holes by receiving transmitted light from the second light source. This eliminates the need for separate dedicated hole inspection components, reducing device complexity while maintaining inspection accuracy
Solution Approach 2:
The patent merges the hole inspection function into the existing front surface inspection system by positioning the first inspection part to also detect transmitted light from the second light source. This consolidation reduces the total number of components by combining multiple inspection functions into a single inspection part
2Reliability
If six components (front light source, back light source, front detector, back detector, transmission light source, hole detector) are disposed, then comprehensive inspection capability is achieved, but space requirements increase
Solution Approach 1:
The first inspection part is designed to perform multiple functions: detecting front surface defects via reflected light and detecting holes via transmitted light. This multi-functional design eliminates the need for a separate dedicated hole detector, reducing the component count from six to four while maintaining comprehensive inspection capability
Solution Approach 2:
The patent combines the hole detection function with the front surface inspection function by positioning the first inspection part to receive both reflected light from the first light source and transmitted light from the second light source, thereby reducing the overall device footprint
3Measurement precision
If six components are used for inspection, then complete defect detection is achieved, but maintenance steps increase
Solution Approach 1:
By merging the hole detection function into the first inspection part, the patent reduces the total number of components that require maintenance. The first inspection part now handles both front surface defect detection and hole detection, eliminating the need for a separate sixth component (dedicated hole detector), thereby reducing maintenance steps while maintaining complete defect detection capability
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
This configuration allows for space savings, reduced costs, and fewer maintenance steps while maintaining accurate inspection capabilities for both surface defects and holes.
Implementation Method 1
a first inspection part configured to detect reflected light obtained by the first surface of the inspection target material reflecting the light emitted by the first light source
Implementation Method 2
a second inspection part configured to detect reflected light obtained by the second surface of the inspection target material reflecting the light emitted by the second light source
Implementation Method 3
the first inspection part is disposed at a position where, when the inspection target material has a hole, light emitted from the second light source and transmitted through the hole is detectable
Data Source
AI summary
Provided is a sheet inspection device capable of saving space, reducing member costs, and reducing the number of maintenance steps. A first light source Ls1 and a first inspection part S1 for inspecting a flaw on the front surface of a sheet and a second light source Ls2 and a second inspection part S2 for inspecting a flaw on the back surface of the sheet are disposed in such a positional relationship that when the sheet has a hole, the first inspection part S1 can detect light emitted by the second light source and transmitted through the hole in the sheet.