Inspection Device Merging Height and Texture Data Acquisition
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Solution Overview
Problem
Existing inspection devices face challenges in accurately grasping the shape and surface state of measurement targets due to the need for separate systems for generating height and texture data, which can result in unmeasurable regions and reduced flexibility in layout, especially when used on conveyor belts.
Innovation Solution
An inspection device is designed with multiple light sources emitting light of different wavelengths that share a common optical path, using a pattern generating part to create structured and uniform light, which is projected onto the target, allowing for simultaneous generation of height and texture image data without the need for separate light projection and reception systems, thereby reducing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate three-dimensional measurement irradiation unit and two-dimensional imaging irradiation unit are used, then height data and texture image data can be acquired, but the device size increases and layout flexibility decreases
Solution Approach 1:
The patent combines the three-dimensional measurement irradiation unit and two-dimensional imaging irradiation unit into a single integrated illumination device. Multiple light sources (including blue, green, and red LEDs) are arranged to share a common optical path, allowing both structured light projection for height measurement and uniform light projection for texture imaging through the same hardware platform, thereby reducing device size while maintaining measurement capabilities
Solution Approach 2:
The illumination device is designed to perform multiple functions: it can project structured light patterns for three-dimensional height measurement, project uniform light for two-dimensional texture imaging, and selectively activate different wavelength light sources for color-specific imaging. This multi-functional design eliminates the need for separate dedicated units for each measurement type
2Measurement precision
If separate three-dimensional measurement irradiation unit and two-dimensional imaging irradiation unit are used, then height data and texture image data can be acquired, but the number of components increases
Solution Approach 1:
The patent merges multiple irradiation functions into a single integrated unit. The illumination device includes multiple light sources with different wavelengths (blue LED, green LED, red LED) that can be selectively activated, along with a single imaging unit that captures both structured light patterns and uniform light images, thereby reducing the total number of components while maintaining both height and texture measurement capabilities
Solution Approach 2:
The single illumination device serves multiple purposes: it can generate structured light for height measurement, uniform light for texture imaging, and colored light for wavelength-specific imaging. The imaging unit similarly performs multiple functions by capturing different types of light patterns, eliminating the need for separate dedicated systems for each measurement type
3Measurement precision
If different irradiation units are used for three-dimensional and two-dimensional measurement, then height and texture data can be acquired, but unmeasurable regions may not align between datasets
Solution Approach 1:
By using a single integrated illumination device with a common optical path for both structured light projection and uniform light projection, the patent ensures that the irradiation regions and measurement fields are identical. This alignment guarantees that height data and texture image data cover the exact same areas on the measurement target, eliminating the unmeasurable region mismatch problem that occurs with separate irradiation units
Solution Approach 2:
The universal illumination device performs both three-dimensional measurement and two-dimensional imaging functions through the same optical path and irradiation geometry. This ensures consistent measurement coverage and alignment between height data and texture image data, as both measurement types are acquired using the identical irradiation configuration
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 and simultaneous capture of height and texture data, eliminating unmeasurable regions and enhancing the device's ability to accurately assess the shape and surface state of measurement targets, while also downsizing the device for improved layout flexibility.
Implementation Method 1
a plurality of light sources configured to be provided so as to respectively emit a plurality of pieces of light having mutually different wavelengths
Implementation Method 2
a pattern generating part that is provided on the common optical path, and configured to receive the light progressing in the common optical path, and selectively generate structured light and uniform light
Implementation Method 3
an imaging part configured to successively generate, by successively receiving the plurality of pieces of the structured light reflected from the measurement target, a plurality of pieces of pattern image data
Data Source
AI summary
An imaging part 120 receives the light that is reflected from the measurement target, and a plurality of pieces of pattern image data are generated. Height data is generated on the basis of the plurality of pieces of the pattern image data. Green light, blue light, and red light are successively emitted from the light sources 111 to 113, and are reflected from the pattern generating part 118, and uniform light of the green light, uniform light of the blue light, and uniform light of the red light are successively projected onto the measurement target. The imaging part 120 receives the uniform light reflected by the measurement target, and a plurality of pieces of texture image data are successively generated. The plurality of pieces of the texture image data are synthesized, whereby color texture image data is generated.