I believe that many careful drivers will find dense black spots on car. Why are there small black dots on glass? What is their function? Let's take a look with editor.
Recommended reading time: 3 minutes
There are many theories, some say it's used to focus electronic eye on road, some say it's auto wiper sensor, some say it's auto headlights' sensor area, and so on. All of these statements seem possible, but editor says they are all wrong!
Carefully find out that these small black dots are distributed over many car windows, and their position is different, and corresponding functions are also different.
Behind center rear-view mirror
The black dot of center rearview mirror can act as a sun visor, and sun visor and black dot of center rearview mirror can prevent sun from obscuring the driver's view.
The black spot on edge of windshield does not serve as a sun visor, it is mainly used for protection. We know that heat absorption capacity of glass is higher than that of body. The front windshield is usually attached to car with adhesive. When car is strongly lit, surrounding glass expands with increasing temperature, and middle glass is transparent, so heat is not heated by surrounding edges. high .
This results in a difference in degree of expansion of glass, which can lead to damage. But with these little black dots, heat around glass can be reduced, and temperature difference between environment and middle of glass can be balanced, so there won't be much difference in expansion, which is also a disguised form. glass protection.
Okay, after reading it, you are surprised that usual imperceptible little black dots have such a "magical" effect, which just confirms the saying "existence is reasonable."