Dual-Pivot Mirror Scanning Assembly for Vibration-Stable Wide FOV
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Solution Overview
Problem
Vehicle detection systems face challenges in providing a cost-effective and accurate wide field of view with high resolution, while being susceptible to vibrations and space constraints, which affect their accuracy and range.
Innovation Solution
A scanning assembly for vehicle detection systems that includes a mirror attached to pivots with flexible sheets and electromagnets, allowing for azimuth and elevation scans with reduced interference from vehicle vibrations, and a compact design that maintains low moment of inertia, enabling efficient scanning with minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a scanning assembly is added to increase field of view, then detection coverage is improved, but susceptibility to vibration and shock increases
Solution Approach 1:
The scanning assembly is divided into two independent pivot systems: a first pivot for azimuth scanning and a second pivot for elevation scanning. Each pivot operates independently with its own flexible support structure, allowing the system to achieve wide field of view coverage while isolating vibration effects to individual scanning planes rather than the entire assembly.
Solution Approach 2:
The patent employs flexible sheets as support structures for both pivots. These flexible sheets provide mechanical support while inherently damping vibration and shock effects. The combination of rigid pivot axes with flexible support materials creates a composite structure that achieves both structural integrity and vibration isolation.
2Area of stationary object
If additional components are added to expand detection range, then field of view is improved, but system cost increases
Solution Approach 1:
The scanning assembly uses a single mirror that performs dual functionality by scanning in both azimuth and elevation directions through the two-pivot mechanism. This eliminates the need for separate transmitters and receivers for different scanning planes, reducing component count and cost while maintaining wide field of view capability.
Solution Approach 2:
The patent combines azimuth and elevation scanning functions into a single integrated scanning assembly with shared support structures. The flexible sheets serve both mechanical support and vibration damping functions, while the central member couples both pivot systems, achieving cost-effective multi-directional scanning through component sharing.
3Volume of moving object
If a compact design is used to reduce space, then vehicle integration is improved, but moment of inertia is reduced affecting scanning stability
Solution Approach 1:
The patent employs flexible sheets instead of rigid support structures for the pivots. This dynamic approach allows the support structure to adapt to vibration and shock loads while maintaining compact dimensions. The flexibility provides inherent vibration isolation that stabilizes the scanning operation despite the reduced moment of inertia from the compact design.
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 scanning assembly provides a cost-effective and accurate detection system with a large field of view, reduced interference from external forces, and efficient power usage, enhancing the accuracy and reliability of vehicle detection systems.
Implementation Method 1
the first flexible sheet elongated along the first axis such that rotation of the first pivot around the first axis causes the first flexible sheet to bend in torsion, the first flexible sheet forming a first plane and resisting movement of the first section with respect to the second section along the first plane
Implementation Method 2
A first electromagnet is attached to the base and configured to apply a force to the first permanent magnet to selectively push or pull the first mirror to change the first field of view in the first direction via rotation of the first pivot
Implementation Method 3
The first mirror has a reflective surface providing a first field of view between the detection system and a surrounding environment
Data Source
AI summary
A scanning assembly for a detection system for a vehicle has a scanning fixture including a first mirror. The scanning fixture is attached to a first pivot. A reflective surface of the first mirror provides a first field of view between the detection system and a surrounding environment. A central member has a first end attached to the first pivot and a second end attached to a second pivot to couple the first pivot to the second pivot. A base is configured to attach the scanning assembly to the vehicle. The base is further attached to the second pivot. The scanning fixture is coupled to the base exclusively through attachment of the first pivot to the second pivot via the central member, the second pivot in turn being attached to the base.