In this paper, a laser-assisted light-emitting diode (LED) car high-beam headlight for modern cars is proposed. The headlight employs the LED light as the main light source of the car high-beam headlights. Under certain circumstances, the auxiliary main light source of the laser light source is added. Laser light sources are widely used in the field of automotive lighting owing to their high energy efficiency, small size, and good directionality. However, in terms of its application in headlights, the laser itself has limitations, such as a narrow line width and instability. In addition, all laser high beams are afflicted by the problems of laser light sources, and their optical design complexity has increased significantly. Therefore, this study used the total internal reflection of the light cone to promote the uniform distribution of the LEDs. Moreover, the collimating lens is used for laser spot convergence, and the laser light source is positioned at the laser spot to coincide with the LED spot center. Finally, the aspheric lens is incorporated into the light distribution design of the headlight. This optical design ensures driving safety and leverages the advantages of a laser light source to enhance the vehicle high-beam lighting effect, while improving the optical system design and reducing its complexity.
With the rapid development of autonomous driving technology, the driving environment is becoming more and more complex, and higher requirements are put forward for car headlights. This paper proposes a smart headlamp with LED as the light source, Digital Mirror Device (DMD) as the core light distribution element, and free-form surface lens as the optical imaging element. The LED collimating outer lens is calculated by the theory of light refraction and reflection, and modeling and simulation are performed on it. Its optical efficiency meets the design requirements and achieves good light collection and collimation for the LED. According to the relevant specifications of the national standard and the structural characteristics of the DMD micromirror array. Using the principle of area segmentation to design standard patterns that meet national standards and DMD intelligent patterns in multiple traffic scenes; use theoretical calculations to obtain free-form surface imaging lenses. The processed LED light is modulated by DMD to form a specific intelligent pattern, and a free-form surface lens is used to achieve imaging and light distribution. The simulation analysis results show that the optical modulation performance of the system is good, and the optical efficiency meets the design requirements. A prototype of the intelligent light distribution system was built, and compared with the lighting effect after loading the standard pattern, its lighting index reached the national standard requirements, and the intelligent light distribution experiment under multiple intelligent scenes was completed. The system can flexibly load different lighting patterns to achieve clarity. Light projection.
Automobile lighting system is an important guarantee for the safe driving of cars at night. In view of the complex structure of the current LED headlamp system and weak penetrating ability, a laser-filled LED far and near beam integrated automotive headlamp optical system is designed. Theoretical calculations show that the low beam light passes through the low beam cone set. The light device is totally reflected, and the outgoing light is condensed to the focal point of the baffle. The focal point of the baffle coincides with the upper focal point of the special-shaped lens, and the required low beam is obtained by the upper part of the special-shaped lens reflected. Whether the center of the highbeam cone condenser coincides with the lower focus of the special-shaped lens to obtain the required high-beam. The laser light source is emitted through the small hole in the lower part of the special-shaped lens, and the center of the laser spot and the center of the high beam spot are overlapped by the deflection angle. The high beam fill light effect verifies the rationality of the optical system. The simulation results show that the designed optical system of the automobile headlamp complies with the national standards. The headlamp optical system has a reduced volume and strong penetrating ability, which is in line with the current development direction of laser car lights and smart car lights.
We propose a new method to design freeform light distribution lens for light-emitting diode (LED) automotive headlamp based on digital micro mirror device (DMD). With the Parallel optical path architecture, the exit pupil of the illuminating system is set in infinity. Thus the principal incident rays of micro lens in DMD is parallel. DMD is made of high speed digital optical reflection array, the function of distribution lens is to distribute the emergent parallel rays from DMD and get a lighting pattern that fully comply with the national regulation GB 25991-2010.We use DLP 4500 to design the light distribution lens, mesh the target plane regulated by the national regulation GB 25991-2010 and correlate the mesh grids with the active mirror array of DLP4500. With the mapping relations and the refraction law, we can build the mathematics model and get the parameters of freeform light distribution lens. Then we import its parameter into the three-dimensional (3D) software CATIA to construct its 3D model. The ray tracing results using Tracepro demonstrate that the Illumination value of target plane is easily adjustable and fully comply with the requirement of the national regulation GB 25991-2010 by adjusting the exit brightness value of DMD. The theoretical optical efficiencies of the light distribution lens designed using this method could be up to 92% without any other auxiliary lens.
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