Matrix Illumination Device for Compact Inspection
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Solution Overview
Problem
Existing image inspection devices require a large telecentric optical system to ensure uniform irradiation of light over the field of view, making them bulky and inefficient.
Innovation Solution
The device employs a surface light source with multiple optical members arranged in a matrix on a holder, each emitting light with different wavelengths and solid angles, allowing for uniform irradiation and inclination detection through captured image analysis, while maintaining a compact size by matching the holder size to the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a telecentric optical system is used to ensure uniform irradiation of light over the field of view, then illumination uniformity is improved, but device size increases
Solution Approach 1:
The illumination device is segmented into multiple independent light-emitting units arranged in a matrix pattern. Each unit emits light with a specific solid angle, and collectively they cover the entire field of view. This segmentation allows uniform irradiation without requiring a large telecentric optical system, as each segment independently contributes to the overall uniform illumination pattern.
Solution Approach 2:
Different regions of the illumination device emit light with different solid angles tailored to their specific positions. The optical members are configured so that light emitted toward the target has wavelengths and solid angles different from one another, with each local region optimized for its specific irradiation requirements. This local optimization achieves uniform overall illumination while maintaining a compact device footprint.
2Measurement precision
If multiple optical members with different wavelengths and solid angles are arranged in a matrix, then inspection accuracy is improved, but device complexity increases
Solution Approach 1:
Multiple functional elements are merged into a single integrated matrix structure. The holder simultaneously supports multiple optical members with different wavelengths and solid angles, combining wavelength discrimination, solid angle control, and spatial arrangement functions into one unified configuration. This merging reduces overall system complexity compared to having separate systems for each function.
Solution Approach 2:
The matrix arrangement of optical members serves multiple functions simultaneously: it provides wavelength-based surface inclination detection, ensures uniform irradiation coverage, and enables compact device sizing. Each optical member in the matrix is multi-functional, contributing to both illumination uniformity and inspection accuracy while the overall structure achieves space efficiency.
3Area of stationary object
If the holder size is matched to the field of view, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The design changes the arrangement parameters of the optical members within the holder to achieve compact sizing. By carefully selecting the matrix dimensions, spacing, and positioning of each optical member, the holder size is optimized to match the field of view while maintaining manufacturability. This parameter optimization allows compact design without excessive manufacturing precision requirements.
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 enables accurate surface inspection with uniform irradiation conditions across the target, allowing for downsizing of the inspection device and improving inspection accuracy by analyzing the color changes in the captured image based on surface inclination.
Implementation Method 1
The first to n-th optical members are disposed to face the light emitting surface, and transmit light emitted from the light emitting surface toward the target. The first to n-th optical members are configured to emit light toward the target with wavelengths and solid angles different from one another.
Implementation Method 2
light reflected from the target and incident on the photographing portion has a wavelength according to a degree of inclination of the surface of the target
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An image inspection device (1) includes a photographing portion (10) and an illumination portion (20, 120, 220, 320, 420, or 520) that includes a surface light source (30, 130, or 230) and a plurality of sets (41, 141, 241, 341, 441, or 541) each including first to n-th optical members (42R, 42G, and 42B, 142R, 142G, and 142B, 242R, 242G, and 242B, 342R, 342G, and 342B, 442R, 442G, and 442B, or 542R, 542G, and 542B) arranged along a light emitting surface (35, 135, or 235) of the surface light source (30, 130, or 230). Wavelengths and solid angles of light emitted from the first to n-th optical members (42R, 42G, and 42B, 142R, 142G, and 142B, 242R, 242G, and 242B, 342R, 342G, and 342B, 442R, 442G, and 442B, or 542R, 542G, and 542B) toward a target (w) are different.