First, the evolution of automotive lighting devices 1, the types of automotive lighting sources as automotive exterior lighting, car headlights, fog lights, car lights and curved lights with curved lighting and direction Indicator light. At the rear of the car, there are stop lamps, direction indicators, taillights that ignite at the same time as the headlights, mirrors with traceable reflection characteristics that are easy to find in the parking lot, reversing lights, and license plate lights. In addition, it has recently appeared in the car window glass and other places to install the high-position brake light (HMSL). Because the distance from the taillight is far, the position is higher. Therefore, when the driver of the car is stepping on the brakes, the signal is more easily found for the following vehicles, and the brake status display effect is more ideal. 2, car lighting front lighting evolution from the 40s to the early 80s, the automotive industry headlights are all glass sealed, the lens and mirror are integrated, the middle heat radiation incandescent lamp, a total of six shapes as a unified Specifications, due to product specifications, the production process can be greatly simplified, and the mass production cost is low, so it has been widely used for decades. 3, the structure and function of the car headlights Modern car headlights, the basic components are the light source, mirror and lens, but also equipped with some small components to adjust the up and down position of the mirror, adjust the temperature inside the vehicle Vents and waterproof gaskets. 4. Commonly used automobile headlights are introduced as suitable light sources for current automotive headlamps. Mainly H4 and H7 tungsten halogen lamps adopt main and auxiliary filament structures. The main wires are used for normal car driving, and the auxiliary wires are used for automobiles. When the car is in the meeting, in order to avoid the dazzling of the other driver, a parabolic illuminating cover made of molybdenum is added around the auxiliary wire so that the light does not exceed the horizontal line and is emitted horizontally. The light distribution of the H7 headlamp is realized by a mirror. Unlike the H4 type tungsten halogen light source, the lamp is equipped with a molybdenum emission cover, and the light is projected onto the reflective surface by a relatively complicated curved surface. It is strictly controlled in the direction of its re-reflection. It causes the light from the headlights to consist only of reflected light and is completely horizontal, so that when the two cars meet, neither driver will have glare to interfere with driving.
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