Line Sensor Component Imaging with Dynamic Lighting
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Solution Overview
Problem
Component mounting devices with multiple mounting heads in two lines face challenges in efficiently capturing images of components with different optimum lighting intensities, leading to suboptimal image recognition and increased imaging time.
Innovation Solution
A component imaging method that involves determining the optimum lighting intensity for each component, using a line sensor and lighting device to sequentially adjust lighting intensities during imaging, and compensating images captured at non-optimum intensities based on the ratio of actual to optimum lighting, allowing for efficient imaging of components with different lighting needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If twice as long is required to image the same line twice to obtain two images having different lighting intensities, then two component images with different lighting intensities can be acquired, but the component recognition efficiency deteriorates due to increased imaging time
Solution Approach 1:
The patent applies periodic action by alternately switching the lighting intensity between high and low states at regular intervals during the imaging process. The lighting device changes intensity periodically to capture line images at different lighting conditions, enabling acquisition of multiple component images with different lighting intensities in a single pass through the imaging area, thus resolving the time efficiency problem while maintaining image quality
Solution Approach 2:
The patent changes the lighting intensity parameter dynamically during the imaging process. By varying the lighting intensity between high and low levels at different time points during a single imaging pass, the system captures line images with different lighting conditions. This parameter change approach allows efficient acquisition of multiple component images without requiring multiple passes, thereby reducing imaging time while maintaining measurement precision
2Measurement precision
If components are run multiple times with respect to the line sensor while switching lighting intensity, then component images with different lighting intensities can be obtained, but productivity deteriorates due to repeated imaging passes
Solution Approach 1:
The lighting device performs periodic intensity switching during a single component pass, alternating between high and low lighting intensities at regular intervals. This allows the system to capture multiple line images with different lighting conditions while the component moves through the imaging area only once, eliminating the need for multiple passes and thereby maintaining high productivity while achieving accurate component recognition
Solution Approach 2:
The system pre-plans the lighting intensity switching schedule to coincide with the component's movement through the imaging area. By determining in advance when to switch between high and low lighting intensities based on the component's position and speed, the system ensures that optimal images are captured at the right moments during a single pass, maximizing both recognition accuracy and throughput
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 method enables efficient imaging and recognition of components with varying lighting intensities without reducing the speed of component movement, resulting in improved mounting efficiency and image quality by compensating for lighting differences.
Implementation Method 1
a line sensor that images a line image at a predetermined timing and outputs the obtained line image as an image for each imaging line
Implementation Method 2
a lighting device to integrally move the plurality of components in a sub-scanning direction of the line sensor relative to this line sensor
Data Source
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AI summary
A component imaging method includes: an imaging preparation step of obtaining, for each of the plurality of components, an optimum lighting intensity at which a component image, eligible for component recognition, can be obtained; a component imaging step of using a line sensor that image a line image at a predetermined timing and output the obtained line image as an image for each imaging line and a lighting device, to integrally move the plurality of components in a sub-scanning direction of the line sensor relative to this line sensor, with the plurality of components being aligned in a main scanning direction of the line sensor, and to acquire images of the plurality of components while switching a lighting intensity of the lighting device sequentially to the optimum lighting intensity of each of the components for each imaging line during the relative movement; and an image processing step of compensating a line image, which is imaged at a lighting intensity other than the optimum lighting intensities, on the basis of a ratio of the lighting intensity at which the line image is obtained and the optimum lighting intensity of each of the plurality of components of the obtained component images, for the component image of each of the plurality of components.