Tilted Transmission Window for Flat Optical Sensor
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Solution Overview
Problem
Existing optical measuring devices, such as laser scanners, face challenges in minimizing their outer surface area and reducing disturbance signals while maintaining effective object detection, particularly when installed in vehicles where space is limited and direct reflections can lead to unwanted emissions.
Innovation Solution
The optical measuring device features a covering plate with a transmission window tilted at a predetermined angle, typically around 7°, which prevents direct reflections from entering the housing and reduces disturbance signals, allowing for a flat design and efficient use of space, and optionally includes antireflection coatings and a rotatable transmission mirror unit to enhance beam correction and reduce calculation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the covering plate is tilted to prevent direct reflections, then disturbance signals are reduced, but the outer shape is predetermined and spatial requirements increase
Solution Approach 1:
The covering plate is segmented into two functional zones: a first region (transmission window area) tilted at angle α to prevent direct reflections, and a second region (outer surface area) arranged substantially perpendicular to the emission direction to maintain a flat outer shape. This segmentation allows each region to fulfill its specific function independently.
Solution Approach 2:
Different regions of the covering plate are assigned different orientations tailored to their specific functions: the transmission window region is tilted to eliminate disturbance signals, while the outer surface region is perpendicular to provide a flat mounting surface. This local differentiation optimizes both disturbance reduction and spatial efficiency.
2Volume of moving object
If the covering plate is arranged perpendicular to emission direction, then the outer surface is flat and space is minimized, but direct reflections enter the housing and create disturbance signals
Solution Approach 1:
The covering plate is divided into functional zones with different orientations: the transmission window region is tilted to redirect reflected beams away from the housing, while the outer surface region remains perpendicular to maintain a compact flat design.
Solution Approach 2:
The covering plate exhibits local quality variation where the transmission window area has a specific tilt angle for disturbance reduction, while the outer surface area maintains perpendicular arrangement for spatial optimization.
3Object-generated harmful factors
If the transmission window is tilted to redirect reflected beams, then disturbance signals are reduced, but the outer surface shape becomes non-flat
Solution Approach 1:
The covering plate is segmented such that the transmission window region is tilted for optimal beam redirection, while the outer surface region is kept perpendicular to the emission direction to ensure a flat outer shape suitable for vehicle installation.
Solution Approach 2:
Different regions of the covering plate have different orientations: the transmission window area is tilted at angle α to redirect reflections, while the outer surface area is perpendicular to maintain flatness.
4Volume of moving object
If the outer surface is made flat for compact installation, then space requirements are minimized, but the transmission window cannot effectively redirect reflected beams
Solution Approach 1:
The covering plate is divided into a transmission window region with tilt for beam redirection and an outer surface region perpendicular to the emission direction for compact flat installation.
Solution Approach 2:
The covering plate features local quality differentiation where the transmission window zone is tilted to eliminate disturbance signals while the outer surface zone is perpendicular to minimize installation space.
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 results in a more compact, flat optical measuring device with reduced disturbance signals, improved airflow for cleanliness, and enhanced accuracy by minimizing direct reflections and allowing for increased range through beam correction, thereby optimizing space usage and performance.
Implementation Method 1
the beams reflected by the transmission window are not reflected directly onto the deflection mirror in the interior of the optical measuring device
Implementation Method 2
at least one optical transmitter for emitting at least one transmission beam and at least one optical receiver are arranged. The receiver receives the beams reflected on objects and/or obstacles
Data Source
AI summary
The invention relates to an optical measuring device (1) comprising a housing (3), in which at least one optical transmitter (20) for emitting at least one transmission beam (22, 24) and at least one optical receiver are arranged, a covering plate (5) closing off the housing and forming a transmission window (10) and a reception window (7), with the at least one transmission beam (22, 24) emerging from the housing through the transmission window (10).In order to provide a measuring device (1) with an outer surface (14) which is as flat as possible and in order to achieve a reduction in disturbance signals which can be traced back, inter alia, to the reflection of the transmission beam (22, 24) on the transmission window (10), the outer side (5.1) of a covering plate (5) is arranged substantially perpendicular to the emission direction and the transmission window (10) is embodied with a tilt with a predetermined tilt angle (α).