What is the role of car mirrors
The main role of the car mirror (mirror) includes the following aspects :
Road observation : Car mirrors allow drivers to easily observe the road behind, to the side and below the car, greatly expanding their field of vision. This facilitates lane changes, overtaking, parking, steering and reversing operations, thereby improving driving safety .
Judging distance from rear vehicle : The distance between rear vehicle and rear vehicle can be judged through the center rearview mirror. For example, when the front wheel of the rear car is just seen in the central rearview mirror, the distance between the front and rear cars is about 13 meters; When you see the middle net, about 6 meters; When you can't see the middle net, about 4 meters .
Observe the rear passenger : the rearview mirror in the car can not only observe the rear of the car, but also see the situation of the rear passenger, especially when there are children in the back row, convenient for the driver to pay attention to .
Auxiliary emergency braking : During the emergency braking, observe the central rearview mirror to know whether there is a car following closely behind, so as to relax the brake appropriately according to the distance with the front, to avoid being rear-ended .
Other functions : The car mirror also has some hidden functions, such as preventing obstacles when backing up, assisting parking, removing fog, eliminating blind spots and so on. For example, the area near the rear tire can be seen by automatically adjusting the rearview mirror, or there are blind spots on the mirror to reserve jacks to help make it safer when changing lanes or overtaking .
The material of car mirror mainly includes plastic and glass.
Plastic material
The shell of the rearview mirror is usually made of the following plastic materials:
ABS (acrylonitrile-butadiene-styrene copolymer) : this material has the characteristics of high strength, good toughness and easy processing. After modification, it also has excellent heat and weather resistance. It is often used in automobile rearview mirror shell .
TPE (thermoplastic elastomer) : has the characteristics of high elasticity, environmental protection and non-toxic, suitable for rearview mirror base liner .
ASA (acrylate-styrene-acrylonitrile copolymer) : has good weather resistance and high temperature resistance, is the ideal material for making rearview mirror shell .
PC/ASA alloy material : This material combines the advantages of PC (polycarbonate) and ASA, has excellent mechanical properties and good processing properties, often used in car rearview mirror .
Glass material
The mirrors in car rearview mirrors are usually made of glass, which contains more than 70% silicon oxide. Glass lenses have high transparency and good reflection properties, which can provide a clear field of view .
Other materials
reflective film : usually used silver, aluminum or chrome material, foreign chrome mirror has replaced silver mirror and aluminum mirror, the car is generally installed with anti-glare device .
functional raw material : Transition metal tungsten oxide powder may be selected for the new generation of automotive rearview mirrors to achieve better dimming and anti-glare effect .
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