What are the small black spots on the car glass used for? Even many drivers driving for years don’t know it.

Have you ever noticed the black spots on the edge of the window or windshield when driving?

As a car owner, have you ever wondered why there are these small black spots?

This is not what the manufacturer’s stickers look like. They are not very impressive, but they are useful. There are several statements about their use on the Internet

Are all these statements right? Then let’s check out.

Let’s first look at the role of black spots on the window

What are the online statements?

Are these all true?

The windshield has a metal coating, and the area with black spots is vacant, just like opening a small window to allow sensor signals to pass through.

This position is for the camera to be used for focusing, which is mandatory for traffic.

Help the electronic camera on the road to capture and focus.

Every statement seems to make sense

❌ But all is not true❌

So, what is the real scientific use of the black spot on the car window?

Protecting car windows

The car glass and the car are fixed with glue. After the car glass is exposed to the sun in summer, the temperature of the metal frame around the car glass will increase and expand, and the light transmission and heat dissipation of the middle part of the glass is better, and it forms with the edge of the glass.

A kind of contrast, this kind of situation is easy to cause glass deformation. Glass has no toughness, and the result of deformation is bursting. At this time, these black spots are needed to conduct heat.

Similarly, the temperature in winter is low, the inside of the car is hot, and the temperature difference between the inside and outside of the car is very large.

The black heat absorption principle is used to concentrate the heat, and through this transition from the outer to the inner circle to the circle, the heat is gradually balanced. This can achieve the effect of protecting the glass.

To put it simply, the window frame is hot, the glass heats slowly, and small black dots are needed to transfer the heat, and these small black dots gradually become smaller from the window frame to the middle is a transition, dispersing the thermal expansion, reducing the window and front The pressure of the windshield finally reaches the overall balance.

Protecting sight

In addition to the edges of the windows and front windshield, some rearview mirrors also have small black spots. The location of these black spots and their area have been carefully designed so that they do not obstruct the driver’s sight as much as possible, while reducing direct sunlight to the eyes, which helps relieve driver fatigue to a certain extent.

Appraisal quality

These seemingly inconspicuous little black spots, their production process is still quite complicated. To put it simply, its principle is to burn colored glaze onto the glass to blend with the glass and cannot be removed.

Some inferior glass is often used to make up the number, and some black spots and black edges will be pasted or printed. If these black spots can be pulled out, it means that the glass is inferior.