RGB LED Illumination Controller for Uniform Light Amount Resolution
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Solution Overview
Problem
Conventional lighting devices for board work machines with red, green, and blue light sources often experience uneven light amounts, leading to insufficient recognition accuracy due to dimming issues, which affects the precision of image processing.
Innovation Solution
The illuminating unit includes a lighting controller that adjusts the light amounts of red, green, and blue LEDs in the same number of gradations, with the upper limit of the dimming range for stronger light sources being smaller than that of weaker light sources, ensuring uniform light source resolutions and sufficient brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the maximum light amounts of the light sources of the three colors are allowed to vary, then the brightness of each color can be optimized independently, but the light amount resolutions of the light sources become different, resulting in uneven light amounts even after dimming
Solution Approach 1:
The patent changes the parameter of dimming range upper limits for different colored light sources. Specifically, it sets different upper limits for the dimming ranges of red, green, and blue LEDs based on their respective maximum light amounts. This parameter adjustment ensures that all three colors can be dimmed to the same minimum light amount with uniform resolution, while still allowing each color to operate at its optimal brightness level when needed.
2Manufacturing precision
If dimming is applied to equalize the light amounts of the three colors, then light amount uniformity can be improved, but the light sources may not provide sufficient brightness for accurate image recognition
Solution Approach 1:
The patent implements a dynamic lighting control system that can independently adjust the brightness of each colored light source based on imaging requirements. The control device selects appropriate light sources and adjusts their intensity dynamically, allowing the system to provide sufficient overall brightness while maintaining uniform light amounts through the differentiated dimming range configuration.
3Measurement precision
If the light sources of the three colors are individually lit up to illuminate the target object, then three monochromatic images can be obtained for precise recognition, but the varying light amount resolutions make it difficult to achieve uniform illumination
Solution Approach 1:
The patent employs a control device that monitors and adjusts the light output of each colored light source. By implementing feedback control with differentiated dimming ranges, the system can maintain uniform light amounts across all three colors while preserving the ability to individually illuminate the target object for capturing three monochromatic images with high recognition accuracy.
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 ensures that the light sources provide consistent and bright illumination, reducing variability and enhancing recognition accuracy by making the light amounts of the three colors more uniform.
Implementation Method 1
a red light source configured to emit a red light, a green light source configured to emit a green light, and a blue light source configured to emit a blue light
Data Source
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AI summary
An illuminating unit for illuminating an imaging range of a monochromatic camera mounted on a board work machine for working on a board includes a red light source configured to emit a red light, a green light source configured to emit a green light, a blue light source configured to emit a blue light, and a lighting controller configured to adjust independently respective light amounts of the red light source, the green light source, and the blue light source in the same number of gradations within a predetermined dimming range. In the red light source, the green light source, and the blue light source, the upper limit of the dimming range of the light source having the strong light amount is smaller than the upper limit of the dimming range of the light source having the weak light amount.