Pulsed Illumination Device with Supplementary Section
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Solution Overview
Problem
The existing image detection devices with liquid resonant lens systems face challenges in achieving sufficient light volume for pulsed illumination due to high-speed focal point changes, leading to insufficient light volume and overexposure issues on varying surface conditions, particularly when detecting multi-focus images.
Innovation Solution
An image detection device with a pulsed illuminator comprising a main illumination section and a supplementary illumination section, where the illumination controller adjusts the light volume by supplementing illuminance with the supplementary section when the main illumination's illuminance falls below a threshold, ensuring both high-speed operation and sufficient light volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the focal point changes at high speed in the liquid resonant lens system, then the image detection speed is improved, but the light volume of the pulsed illumination becomes insufficient
Solution Approach 1:
The illumination device is divided into two independent sections: a main illumination section that provides pulsed illumination synchronized with the focal point changes, and a supplementary illumination section that provides continuous illumination. This segmentation allows each section to perform its specific function optimally - the main section maintains high-speed synchronization while the supplementary section ensures sufficient light volume
Solution Approach 2:
The supplementary illumination section provides continuous illumination that exceeds the minimum required light volume, ensuring that even during the brief pulsed illumination periods, there is always sufficient light for image detection. This partial action (continuous low-level illumination) complements the main pulsed illumination
2Illumination intensity
If the light volume of the pulsed illumination is increased, then the illuminance on highly reflective surfaces becomes sufficient, but overexposure occurs on less reflective surfaces
Solution Approach 1:
The illumination system dynamically adjusts between two modes: the main illumination section provides high-intensity pulsed illumination synchronized with focal point changes, while the supplementary illumination section provides continuous low-intensity illumination. This dynamic configuration allows the system to adapt to different surface conditions without causing overexposure
Solution Approach 2:
Different illumination characteristics are applied to different needs: the main illumination section provides high-intensity pulsed light for surfaces requiring more light, while the supplementary illumination section provides continuous low-intensity light for surfaces that are already well-illuminated, creating locally optimized illumination quality
3Measurement precision
If the pulse width is narrowed to several tens nanoseconds for high-speed focal point changes, then the image detection precision is improved, but the duty ratio of the pulsed illumination becomes small
Solution Approach 1:
The supplementary illumination section provides continuous illumination that ensures there is always sufficient light available, eliminating the gaps created by the narrow pulsed illumination. This continuity maintains the useful action of illumination throughout the entire cycle, not just during the brief pulse 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 configuration allows for high-speed pulsed illumination with a sufficient light volume, improving image detection accuracy and preventing overexposure across different surface conditions, while simplifying control configurations by eliminating the need for precise timing control in the supplementary illumination.
Implementation Method 1
The liquid resonant lens system generates a standing wave in an internal liquid by a cyclic drive signal to cyclically change a focal point of the lens
Implementation Method 2
a pulsed illuminator configured to provide pulsed illumination to the object in synchronization with the focal point
Data Source
AI summary
An image detection device includes: a liquid resonant lens system whose focal point is cyclically changed; an image detector configured to detect an image of an object through the lens system; a pulsed illuminator configured to provide pulsed illumination to the object in synchronization with the focal point; and an illumination controller configured to control the pulsed illuminator, in which the pulsed illuminator includes a main illumination section and a supplementary illumination section, and the illumination controller is configured to provide pulsed illumination to the object with the main illumination section and supplement illuminance on the object with the supplementary illumination section when the illuminance on the object by the main illumination section is equal to or less than a predetermined threshold.