Equol Raw Material,Sr-Equol 94105-90-5,Equol Cas 94105-90-5,Raw Materials Equol 531-95-3 Jinan Meiluwei Biotechnology Co.,Ltd. , https://www.mlwpharma.com
The fog lamp is mounted on the front of the car at a slightly lower position than the headlights. It is used to illuminate roads in rain and fog. Because fog visibility is low, the driver's line of sight is limited. The light can increase the operating distance, especially the light penetration of the yellow anti-fog lamp, it can improve the visibility of the driver and the surrounding traffic participants, so that the arrival of vehicles and pedestrians in the distant place to find each other, the safety of the car It plays a crucial role.
Fog lamp design principle
Fresnel lens fog lamp design is an important part of the Fresnel lens is made of polyolefin material injection pressure sheet, but also made of glass, the lens surface is a glossy surface, the other side of the burning from small to large concentric The circle, its texture is designed using the interference of light and the relative sensitivity and receiving angle requirements, the requirements of the lens are very high. The Fresnel lens has two functions: one is focusing, that is, the pyro-infrared signal is refracted (reflected) on the PIR. The second function is to divide the detection area into several bright and dark areas so as to enter the detection area. The moving object can generate a varying pyroelectric infrared signal on the PIR as a temperature change.
The continuous surface portion of the Fresnel lens is "collapsed" onto a flat surface. Viewed from the cross-section, the surface consists of a series of zigzag grooves, the central part of which is an elliptical arc. Each groove has a different angle from the adjacent groove, but it concentrates the light to form a central focus, which is the focus of the lens. Each groove can be seen as a separate lenslet that adjusts the light to parallel light or spotlight. In this paper, the light emitted by the LED is converted into parallel light.
LED light source selection
There are strict standards at home and abroad regarding rear fog lights for motor vehicles, but there is no standard for semiconductor lighting. The LED rear fog lamp designed in this article takes the conventional requirements of traditional tungsten lamp and halogen lamp as the standard. GB-11554 specifies that the rear fog lamp has a red light source. The greatest difficulty in light distribution is: to ensure that the intensity of light in the rhombic region is within a certain range. In order to get a good design effect, this design uses OSRAM (Osram)'s low-power red LED, which has high luminous efficiency and very small size. The light-emitting angle is 120°. At a working current of 700 mA, the luminous flux is typical. It is 10 lm.
Extensive reading:
LED (Light Emitting Diode), a light emitting diode, is a solid state semiconductor device that can directly convert electricity into light. The heart of the LED is a semiconductor wafer. The LED was originally used as the indicator light source for instrumentation. Later, various light-colored LEDs were widely used in traffic lights and large-area displays, resulting in good economic and social benefits. . Take the 12-inch red traffic signal as an example. In the United States, a long-life, low-efficiency, 140-watt incandescent lamp was used as the light source, which produced 2,000 lumens of white light. After passing through the red filter, the light loss was 90%, leaving only 200 lumens of red light. In the newly designed lamp, Lumileds uses 18 red LED light sources, including the circuit loss, a total of 14 watts of power, can produce the same luminous efficiency. Automotive signal lights are also an important area for the application of LED light sources.
Design points of rear fog lamps for cars