Object Detector Light Emitting Region Size Optimization
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Solution Overview
Problem
Existing object detectors, such as laser radars, face issues with light quantity loss due to the size of the light emitting region not being considered, leading to missed detection areas or overlapping detection regions, especially when the light emitting region size becomes large, affecting angular resolution and detection efficiency.
Innovation Solution
An object detector design that includes a light source, an optical system to convert the light beam into a predetermined state, a deflector to scan the light beam, and a photo detector to detect reflected light, where the size of the light emitting region is optimized to align with high angular resolution directions, reducing light quantity loss by adjusting the focal lengths and positions of lenses to ensure efficient irradiation and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the size of the light emitting region is not considered in the optical system design, then the device complexity is reduced, but light quantity loss increases and detection accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the focal lengths of the transmitter lens and coupling lens based on the light emitting region size. Specifically, the transmitter lens focal length is set to convert the light beam into parallel light, and the coupling lens focal length is set to image the light emitting region onto the photo detector, thereby reducing light quantity loss without significantly increasing device complexity
Solution Approach 2:
The patent applies local quality by considering the specific characteristics of the light emitting region (its size and shape) and designing the optical system to match these local properties. The transmitter lens and coupling lens are configured with focal lengths that correspond to the light emitting region dimensions, ensuring optimal light transmission and detection
2Illumination intensity
If the light emitting region size is large, then the light source can provide sufficient illumination, but the light beam cannot be converted into parallel light and detection areas may be missed or overlapped
Solution Approach 1:
The patent resolves this contradiction by changing the focal length parameter of the transmitter lens to match the light emitting region size. When the light emitting region is large, the transmitter lens focal length is adjusted accordingly to ensure the light beam is properly converted into parallel light, preventing missed or overlapping detection areas while maintaining sufficient illumination
Solution Approach 2:
The patent applies local quality by designing the optical system to specifically accommodate the light emitting region characteristics. The transmitter lens and coupling lens are configured with focal lengths that correspond to the light emitting region dimensions, ensuring optimal light transmission and detection area coverage
3Measurement precision
If the focal lengths of lenses are optimized to reduce light loss, then detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal lengths of the transmitter lens and coupling lens based on the light emitting region size. This results in improved detection accuracy as the light beam is properly converted into parallel light and the light emitting region is correctly imaged onto the photo detector
Solution Approach 2:
The patent applies local quality by designing the optical system to specifically accommodate the light emitting region characteristics. The transmitter lens and coupling lens are configured with focal lengths that correspond to the light emitting region dimensions, ensuring optimal light transmission and detection
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
The optimized object detector reduces light quantity loss, enhances angular resolution, and prevents missed detection areas by aligning the light emitting region size with high angular resolution directions, improving detection efficiency and accuracy.
Implementation Method 1
a light beam from a semiconductor laser as a light source is converted into parallel light by a transmitter lens as an optical system. Namely, a distance from the semiconductor laser to a principal point of the transmitter lens is set to be equal to a focal length of the transmitter lens, so that a conjugate image of its object point is formed at infinity
Implementation Method 2
The light beam which is converted into the parallel light by the transmitter lens is subsequently scanned by a rotating mirror
Implementation Method 3
the laser radar detects reflected light or scattered light from the object with a photo detector. As a photo detector, an avalanche photodiode is utilized
Data Source
AI summary
An object detector includes a light source; an optical system that converts a light beam emitted from the light source into a predetermined state; a deflector that deflects and scans the light beam passing through the optical system, and that irradiates the light beam onto an object; and a photo detector that detects reflected light or scattered light. A first size of a light emitting region of the light source is different from a second size of the light emitting region, wherein the first size is a first width of the light emitting region in a first direction, and the second size is a second width of the light emitting region in a second direction. One of the first direction and the second direction corresponding to a smaller one of the first size and the second size coincides with a direction in which angular resolution is higher.