Range Finder LD Driver Circuit Segmentation for Accuracy
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Solution Overview
Problem
Conventional laser radars face challenges in achieving accurate range-finding due to the trade-off between current capacity and response speed in light-emitting diode (LD) driver circuits, leading to measurement errors, especially when detecting longer distances.
Innovation Solution
The range finder employs a plurality of LD driver circuits with different response times and current amplification factors, allowing selection of the appropriate circuit based on the distance to the subject, ensuring optimal current capacity and response speed for accurate distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single LD driver circuit is used with high current capacity, then the light output is sufficient for long-distance measurement, but the response speed becomes slow causing measurement errors
Solution Approach 1:
The patent divides the single LD driver circuit into multiple driver circuits (first, second, and third driver circuits) with different current amplification factors and response times. This segmentation allows the system to select the appropriate driver circuit based on distance requirements, using faster response circuits for short distances and higher current capacity circuits for long distances, thereby resolving the contradiction between response speed and measurement accuracy.
Solution Approach 2:
The patent implements dynamic selection of LD driver circuits based on the measured distance. The measurement controller dynamically switches between different driver circuits depending on whether the target is at a short, medium, or long distance. This dynamic adaptation allows the system to optimize response speed for close targets while providing sufficient current capacity for distant targets, eliminating the fixed trade-off.
2Measurement precision
If multiple LD driver circuits are used with different response times, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs multiple LD driver circuits that share common infrastructure (light source, measurement controller, basic circuit architecture) while differing only in their current amplification factors. This multi-functionality approach allows the system to achieve different performance characteristics using variations of a proven design, reducing overall complexity compared to completely independent circuits. The measurement controller universally manages all driver circuits through a standardized selection process.
3Reliability
If high current is supplied to achieve long-distance detection, then detection capability is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts power consumption by selecting different driver circuits based on distance. For short-distance targets, the system uses driver circuits with lower current amplification factors, consuming less power. For long-distance targets, it switches to driver circuits with higher current capacity. This dynamic power management ensures that high power is only consumed when necessary for long-range detection, optimizing the balance between detection capability and energy efficiency.
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 approach enhances the accuracy of range-finding operations by selecting the appropriate LD driver circuit for each distance, reducing measurement errors and maintaining stable and accurate distance measurements while achieving electrical power savings.
Implementation Method 1
a light source (LD 10)
Implementation Method 2
receives reflected light from the subject
Implementation Method 3
LD driver circuits which supply a driving current to the light source when a light-emitting signal that controls the emission of the light source is input
Data Source
AI summary
A range finder which irradiates a subject by emission of a light source, and receives reflected light from the subject so as to measure a distance to the subject, the range finder includes a plurality of light-source-driving circuits supplying a driving current to the light source when a light-emitting signal that controls the emission of the light source is input, wherein the light-emitting signal is output to one of the light-source-driving circuits, and each of the light-source-driving circuits has a different response speed to the light-emitting signal.