Object Detection Device with Vignetting Optical System
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Solution Overview
Problem
Conventional object detection devices face challenges in achieving compact construction and flexibility, particularly in adapting to varying object detection areas and country-specific configurations.
Innovation Solution
The proposed solution involves a laser radar device with a light emission system, optical deflector, and photodetector configuration that ensures equal light reception at both ends of the detection area, using a rotating polygon mirror and imaging forming lens to maintain consistent detection accuracy and flexibility, allowing for compact design and reduced need for multiple configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional object detection devices use traditional configurations with separate components for light transmission and reception, then detection function is achieved, but device size becomes large and flexibility is reduced
Solution Approach 1:
The patent combines the light transmission path and light reception path into a single optical axis, merging previously separate optical systems into one integrated structure. This reduces the overall device volume while maintaining detection functionality, directly resolving the contradiction between compact size and operational flexibility
Solution Approach 2:
The optical deflector serves multiple functions: it both transmits light to the detection area and receives reflected light from the same optical path. This multi-functionality eliminates the need for separate transmission and reception optical systems, achieving compact construction without sacrificing adaptability
2Adaptability or versatility
If conventional devices use fixed optical paths, then construction is simplified, but adaptability to varying detection areas and configurations is reduced
Solution Approach 1:
The patent introduces a rotating polygon mirror as the optical deflector, enabling dynamic scanning of the detection area. The rotation angle and speed can be adjusted to adapt to different detection requirements and areas, providing flexibility without requiring multiple fixed configurations
Solution Approach 2:
The system allows adjustment of detection parameters including the detection area size, scanning angle, and light reception sensitivity. By changing these parameters, the device can adapt to various detection scenarios without modifying the physical structure, reducing configuration complexity
3Measurement precision
If light reception is optimized for center of detection area, then central detection accuracy is high, but light reception at ends of detection area is insufficient
Solution Approach 1:
The patent employs an imaging forming lens that creates different magnification rates for different regions of the detection area. The lens is positioned and configured so that light from both ends of the detection area is imaged with appropriate magnification onto the light receiving element, ensuring equal light reception and detection accuracy across the entire area
Solution Approach 2:
The optical system uses asymmetric imaging where the magnification rate varies across the detection area. By carefully designing the asymmetric magnification distribution, the system compensates for the natural light intensity variation, ensuring that light from both ends of the detection area reaches the receiver with equal intensity
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 accurate object detection with equal light reception at both ends, reducing the need for specification changes and enabling cost-effective, compact construction by using common parts, thereby enhancing flexibility and adaptability.
Implementation Method 1
an optical deflector 204, the light emitted from which is deflected
Implementation Method 2
a light detection system 202 including an imaging forming lens 28 and a photodetector 29
Implementation Method 3
a photodetector 29 that receives the light passed through the imaging forming lens 28
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
An object detection device (20) includes a light source unit (201) that emits light toward an object positioned in a detection area, an optical deflector (204) including a reflection surface to reflect light, which is emitted from the light source unit (201) and reflected from the object, incident on the reflection surface, an optical system (28) arranged on an optical path of the light reflected from the reflection surface, and a light-receiving unit (29) configured to receive the light passed through the optical system (28). The optical system (28) vignettes a part of one, which is incident on the reflection surface at a smaller incident angle than the other, of light reflected from the object in a first end portion of the detection area and light reflected from the object in a second end portion that is on the side opposite from the first end portion of the detection area.