Rotating Mirror Carrier for Overlapping Vehicle Detection Ranges
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Solution Overview
Problem
Existing laser scanners for motor vehicles have a limited vertical field of view, which is insufficient for certain applications, and increasing this view comes at the expense of reduced sampling rates and increased production costs due to complex structural requirements.
Innovation Solution
The optoelectronic detection device employs a rotating mirror carrier with mirror surfaces tilted at a specific angle, allowing overlapping detection areas to expand the vertical field of view while maintaining a high sampling rate, achieved by assigning detector cells to overlapping areas and using an evaluation algorithm to combine signals from these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the vertical field of view is increased by adding more detector cells, then the detection area is improved, but the sampling rate decreases
Solution Approach 1:
The patent merges the detection areas of two mirror surfaces by tilting them at a specific angle, creating an overlapping region that is scanned by both mirrors. This allows the system to achieve an extended vertical field of view without proportionally increasing the number of detector cells, thereby maintaining a high sampling rate in the overlapping area while expanding the total detection coverage.
2Area of stationary object
If the vertical field of view is increased by adding more detector cells, then the detection area is improved, but the device complexity and production costs increase
Solution Approach 1:
The patent combines the functionality of two mirror surfaces to scan a larger vertical area than a single mirror could achieve alone. By tilting both mirrors at a specific angle and creating overlapping detection areas, the system extends the vertical field of view without requiring a proportional increase in detector cell数量, thus reducing device complexity and production costs.
3Productivity
If multiple light sources are used to maintain high sampling rate with many detector cells, then the sampling rate is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines the scanning functionality of two mirror surfaces to cover a larger vertical field of view. The overlapping detection areas are scanned by both mirrors, allowing the system to maintain high sampling rates in the overlapping region using the same light sources, thereby avoiding the need for additional light sources that would increase device complexity and cost.
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 provides an optimal compromise between maximum detection area and high sampling rates, particularly in critical driving assistance applications, with cost savings from reduced component usage and no change in power balance.
Implementation Method 1
A transmitting and receiving optics emits electromagnetic rays and forms reflected rays, ie rays that are reflected by a target object in the vicinity of the motor vehicle, onto a detector
Implementation Method 2
the mirror surfaces are arranged or set at such a tilt angle relative to the axis of rotation that the detection areas of the detector, which are projected differently by the tilted mirror surfaces, overlap
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a scanning optoelectronic detection device and to a method for detecting the environment of a motor vehicle (1) in a scanning manner by means of an optoelectronic detection device (2). The detection device (2) comprises a transmitting and receiving optical unit (4), which outputs electromagnetic beams and images reflected beams on a detector, wherein the detector has a multi-cell design and comprises a plurality of detector cells for providing electrical reception signals in dependence on received reflected beams, which detector cells are lined up in a detector cell stack and can be evaluated in parallel measurement planes. The detection device also comprises a mirror support (7) having mirror surfaces (9, 10) facing away from each other, which are arranged tilted at a tilt angle in relation to an axis of rotation (8) of the mirror support (7) and which image different vertical detection ranges for reflected beams onto the detector. According to the invention, in order to enable the detection of the environment of a motor vehicle by means of an optoelectronic detection device with the greatest possible detection range and with little construction complexity, such certain tilt angles α of the mirror surfaces (9, 10) are provided that the detection ranges (14', 14") overlap in a center section of a total detection range (16).