Views:63 Author:Site Editor Publish Time: 2020-05-26 Origin:Site
In 1885, German engineer Karl. Benz developed the world's first gasoline engine-powered three-wheel internal combustion engine, but it was made of metal materials. The car was born and developed rapidly. However, to drive at night or on a dark road, there must be lighting tools. It can be said that with a car, there are headlights. Both headlights and cars are born and developed simultaneously. The evolution of car lights generally goes through the following stages:
The first headlights were kerosene lamps installed in cars. In order to improve the illumination of the road ahead, a parabolic reflective strip with a piece invented by Kruppin in 1779 was used. Kerosene lamps were also used as the rear lamp of the car.
After the appearance of incandescent electric lights in 1879, people naturally thought of applying it to cars, but the initial attempts failed. Acetylene is produced by a chemical reaction between calcium carbide and water using a lightweight acetylene generator installed on the car's pedal or frame. Once the car stops, the reaction gradually weakens and the lighting fades out.
In 1913, an inflated incandescent light bulb was invented using a spiral tungsten wire as a light emitter. The United States used it on the headlights of Cadillac cars and began the era of automotive electrical lighting. 1017 Cadillac's headlights began to use reflective tiles to improve the utilization of light energy and increase illumination.
Early electric light source headlamps consisted of light bulbs. With the increase of vehicle speed, the brightness of vehicle lights is required to increase, which makes the problem of dazzling drivers of oncoming vehicles become more prominent.
In order to solve the contradiction between road lighting and the glare of the oncoming driver, in 1924 Europe invented the dual-filament headlamp, thereby developing an asymmetrical headlamp. This headlight uses two filaments of the same bulb as the light source of the headlight and the headlight.
After 1940, the United States developed closed headlamps. He integrated the light source, reflector and light distribution lens into a sealed unit. The high-beam filament is designed to be placed in the shape of a short straight cylinder at the focal point of the reflector; the position of the low-beam filament is designed on a horizontal plane slightly above the optical axis, so that the light beam is reflected below the optical axis and reflected to the right after being reflected by the reflector.
This headlamp does not require a light distribution mirror, and the light reflected from the free-form mirror is a light type that meets the requirements of regulations.
Conventional electric light source headlamps are called reflective headlamps because of their structural characteristics. In 1984, the Federal Republic of Germany Hella Automotive Lamp Company introduced a new generation of headlamps, projection headlamps, and began mass production since 1990. The projection type headlight is composed of a light bulb, a reflector, a baffle, a convex lens and a light distribution lens.
It is abbreviated as HID lamp, also called gas discharge lamp. Since 1995, European regulations have approved the use of such lamps.
Fiber optic vehicle lights are the latest generation of automotive lamps developed based on the principle of total reflection of light using light source fibers to achieve light transmission. Fiber optic headlights can be used as both headlights and fog lights, and they are more widely used in various interior lighting.