Inspection Apparatus Light Blocking Wall Specular Reflection
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Solution Overview
Problem
Inspection apparatuses using telecentric optical systems require large lens apertures to capture specularly reflected light, leading to increased size and cost.
Innovation Solution
Incorporating a light blocking wall group between the light source and the target region, which limits light traveling in directions other than specular reflection, allowing only specularly reflected light to pass to the imaging unit, thereby reducing the need for a large lens aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telecentric optical system is used to capture specularly reflected light from the entire target region, then inspection accuracy is improved, but the lens aperture size and apparatus cost increase
Solution Approach 1:
The patent extracts only the specularly reflected light components from the target region using a light blocking wall group, separating them from other light directions. This allows the imaging unit to capture only the necessary specular reflection information without requiring a large aperture to collect all light from the entire target region
Solution Approach 2:
The patent applies local quality by using a light blocking wall group to selectively transmit light in specific directions (specular reflection directions) while blocking other directions. This creates a localized light transmission path that maintains inspection accuracy for specular reflections while reducing the overall lens aperture size requirement
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 approach enhances inspection accuracy by increasing specular reflection components and reduces the size and cost of the inspection apparatus by minimizing the lens aperture requirements.
Implementation Method 1
allows light, which travels in one direction and is incident on the imaging unit in a case where the light is specularly reflected from the target region, to pass
Data Source
AI summary
An inspection apparatus includes a limiting unit that is provided between a light source and a target region and limits light traveling from the light source toward the target region, and an imaging unit that captures an image using light passing through the limiting unit, reflected from the target region, and incident on the imaging unit. The limiting unit allows light, which travels in one direction and is incident on the imaging unit in a case where the light is specularly reflected from the target region, to pass and allows at least a part of light, which travels in other directions, not to pass, among light emitted from the light source.