Dynamic Lighting Control for Image Shake Reduction in Component Mounting
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Solution Overview
Problem
Conventional image taking systems for electronic circuit components face challenges in achieving optimal image brightness and accuracy due to limitations in light emission time and movement velocity control, which affect the quality of images taken for processing and mounting.
Innovation Solution
An image taking system with a lighting device capable of varying light emission time and a subject-portion moving device that adjusts movement velocity, allowing for precise control of light exposure and movement during image capture to ensure suitable image brightness and accuracy, regardless of the subject's reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emission time is extended to improve image brightness, then the image brightness increases, but the image shake increases due to subject movement
Solution Approach 1:
The lighting device dynamically adjusts its light emission time based on the movement velocity of the subject portion. The control device coordinates the lighting duration with the subject's movement, emitting light only for the necessary period to capture adequate brightness while minimizing the time window for shake to occur. This dynamic coordination resolves the contradiction between needing sufficient light exposure time and minimizing image shake.
2Productivity
If the movement velocity is increased to improve productivity, then the processing speed increases, but the image brightness decreases due to reduced light exposure time
Solution Approach 1:
The system dynamically adjusts the light emission time in direct response to the movement velocity of the subject portion. When the subject moves faster, the lighting device increases its emission duration proportionally, ensuring that the total light exposure remains sufficient even at high speeds. This dynamic adaptation allows the system to maintain both high productivity and adequate image brightness simultaneously.
3Illumination intensity
If the light emission time is extended to compensate for low reflectance, then the image brightness improves, but the image shake increases affecting measurement precision
Solution Approach 1:
The control device dynamically coordinates the light emission time with the movement characteristics of the subject portion, particularly adapting to variations in reflectance. For subjects with low reflectance, the system increases light emission duration while simultaneously adjusting the timing to coincide with periods of minimal movement, thereby achieving adequate brightness without excessive shake that would compromise positional error detection accuracy.
Solution Approach 2:
The system uses feedback from the subject portion's reflectance characteristics and movement velocity to dynamically adjust the light emission time. By monitoring these parameters in real-time, the control device optimizes the lighting duration to provide sufficient brightness for low-reflectance subjects while maintaining measurement precision by limiting exposure during high-movement periods.
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 solution enables the acquisition of images with suitable brightness and reduced image shake, improving the accuracy of positional error detection and component mounting by optimizing light emission time and movement velocity based on the subject's reflectance characteristics.
Implementation Method 1
a lighting device (254) capable of changing a light emission time to a plurality of time length values that are different from each other
Implementation Method 2
an image taking device (250, 252) configured to take an image of a subject portion while light is being emitted by the lighting device
Data Source
AI summary
An image taking system including: (a) a lighting device capable of changing a light emission time to various time length values; (b) an image taking device configured to take an image of a subject portion while light is being emitted by the lighting device; (c) a subject-portion moving device configured to move the subject portion relative to the image taking device, and capable of changing a movement velocity of the subject portion relative to the image taking device, to various velocity values; and (d) a control device configured, during movement of the subject portion by the subject-portion moving device, to cause the lighting device to emit the light for one of the time length values as the light emission time and to cause the image taking device to take the image, and is configured to control the movement velocity, such that an amount of the movement of the subject portion for the above-described one of the time length values is not larger than a predetermined movement amount.