Automotive Lighting Device Shielding High-Frequency Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automotive luminous devices face challenges with electromagnetic interference from high-frequency signals used in LiDAR technology, which can affect electronic components and require costly, bulky dedicated radiation systems for efficient light transmission.
Innovation Solution
An automotive luminous device with a printed circuit board featuring a conductive shield and intermediate conductive tracks powers an electroluminescent incoherent light source with a high-frequency driver, modulating light flux to prevent interference and integrate high-frequency control into ordinary lighting or signalling devices, using a blue LED with wavelength conversion for efficient and safe object detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If LiDAR technology uses high frequency signals to control light emission, then object detection capability is improved, but electromagnetic interference affects electronic components
Solution Approach 1:
The patent introduces a conductive shield as an intermediary element between the high-frequency light emission control circuit and other electronic components. This shield acts as a mediator that blocks electromagnetic interference while allowing the high-frequency signals to function properly for object detection, thus resolving the contradiction between detection capability and electromagnetic interference protection
2Use of energy by moving object
If a dedicated radiation system is used to emit infrared light, then light transmission efficiency is improved, but device cost and bulk increase
Solution Approach 1:
The patent applies existing automotive lighting devices (headlights, taillights, signaling devices) to serve dual functions: providing illumination/signaling and acting as LiDAR light sources for object detection. By making the lighting system multi-functional, the patent eliminates the need for separate dedicated radiation systems, thereby reducing device complexity, cost, and bulk while maintaining light transmission efficiency
Solution Approach 2:
The patent combines the LiDAR light emission function with the existing automotive lighting system into a single integrated device. This merging of functions allows the same light source to serve both illumination purposes and object detection purposes, avoiding the need for separate dedicated radiation systems and reducing overall system complexity
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 solution effectively shields electronic components from electromagnetic interference, allows for efficient high-frequency operation of incoherent light sources, and simplifies design by enabling both daytime and nighttime object detection functions with a single light source, reducing costs and complexity.
Implementation Method 1
an electroluminescent incoherent light source installed in the first outer layer of the printed circuit board and electrically connected to the intermediate conductive tracks, the incoherent light source being configured to emit a pulsed light flux modulated according to a code
Implementation Method 2
a conductive shield positioned along the printed circuit board... the high frequency signal created by the driver element to power the incoherent light source is shielded by a conductive cage comprising the first conductive layer and the conductive shield, which acts as a Faraday cage to prevent electromagnetic interferences
Implementation Method 3
a sensor element configured to receive the pulsed light flux, modulated according to the code, emitted by the incoherent light source, that is reflected by the outer object
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention refers to an automotive luminous device (10) comprising - a PCB (1) comprising at least a first outer layer (11), a first conductive plane (11, 12), a conductive shield (7, 14) and an intermediate layer (13) arranged between the first outer layer (11) and the conductive shield (7, 14), wherein the intermediate layer (13) comprises tracks (2); - an electroluminescent incoherent light source (3) installed in the first outer layer (11) of the PCB (11) and connected to the tracks, the light source being configured to emit a pulsed light flux modulated according to a code, while contributing to a lighting or signalling function; - a high frequency driver element (6) installed in the PCB (1), configured to power the light source (3) with a control signal modulated in a frequency higher than 1 MHz, delivered to the light sources through the tracks, so that the light source emits light modulated according to the code; - a sensor element configured to receive the pulsed light flux reflected by the outer object.