Do you know what the black dot on the window glass is?

I'm sure you've all noticed.

There are some small black dots on the edges of the sunroof, front windshield, and rear windshield of your vehicle, but do you know what these little black dots do? Why are they on all cars?

Black dot at the base of the interior mirror mount.

Black dots on the edge of the front windshield.

Black dots on the edge of the sunroof glass.

The black dot at the rear triangular window.

Black dots on the edge of the rear windshield.

Envision SUV vehicles have small black dots in the above places, so what are their functions?

Function 1: Since the glass edge in these places needs to use glass glue, in order to aesthetically design the glass edge black, these small black dots are also used as a decorative transition.

Effect 2: Under the exposure of the vehicle under the strong sunlight, the glass will expand with the increase in the temperature of the metal frame, and because the window ** is transparent, the temperature rise is not so fast, and the difference in temperature may cause the glass to expand differently and damage the glass; The use of small black dots can gradually overabsorb heat, disperse the expansion force, and avoid damage to the glass.

The black dots on the car glass have the following functions: the black dots on the car glass have a magical aesthetic function, and the tiny black dots perfectly become excessive colors, which makes the car much better in terms of overall visual sense. On some models, due to various electronic devices.

The rearview mirror and the rain sensor are installed separately on the glass, which will have a certain sense of abruptness and is very incongruous. The appearance of black dots can just shield this sudden feeling, which is better in terms of visual experience. Protective glass:

When the car is produced, the glass needs to be heated, and the appearance of black dots is to evenly distribute this heat on the glass, otherwise it is easy to cause the glass to deform and lose its original shape. Make the glass evenly heated: In the later stage of use, the sun continuously irradiates the glass, the heat absorption capacity around the glass is strong, the temperature rises quickly, and the overall thermal expansion coefficient is different.

The surrounding glass will squeeze into the middle, which is likely to damage the glass. The black dots are also used to protect the glass by heating more evenly in the later stage.

With the progress of the times, the car configuration is becoming more and more user-friendly, not only complete functions but also very practical, such as airbags, reversing radar, ABS anti-lock braking system and so on. Even the window glass is designed just right. Many friends will definitely ask, is there any magic about window glass?

Really, there are those little black dots under the window glass. Do you know what these little black dots do?

In fact, the existence of everything on top of the car has its inevitability. It doesn't matter that there isn't much going on, and the design of this little black dot naturally has its meaning. If you look closely, you'll see that these small black dots are distributed under the window, and they are all black, disappearing as they become smaller in the middle.

If only sealants are used to fasten windows and car bodies, these sealants will deteriorate and harden after being exposed to ultraviolet light, affecting the tightness and having no aesthetic effect. These little black dots solve this problem. Using these small black dots not only protects the sealant on the car glass, but also acts as a shield and aesthetics.

In addition to aesthetics, there is actually a great practical effect. These small black dots can protect the window glass from being damaged in hot weather, as the car glass and windows are secured with sealant. If exposed to sunlight, the metal on the window frame of a car will heat up rapidly, and the car glass and metal window frame will expand as the temperature increases.

In hot weather, the middle part of the car glass is translucent and absorbs much less heat than the surrounding edges, so the temperature of the middle glass is lower than the surrounding edges, which is easy to form different expansion forces around and in the middle of the glass, resulting in different degrees of glass expansion, which is likely to cause damage to the glass. But with these small black dots, the heat at the edge of the glass can be greatly reduced, and the temperature difference around the glass can also be equalized, so that the expansion force is not too great and damages the glass.

So why do these black dots go big on the edge of the window, but disappear as they get smaller in the middle? Because these small black dots can absorb heat more quickly, and then store the heat in black dots of different sizes, through the different sizes of black dots, the speed of heat transfer can be changed, and the heat is evenly transferred to the middle of the glass, thus preventing the possibility of cracking the glass due to expansion.

In addition, these small black dots protect the driver's eyes. Those black dots above the front windshield and behind the mirrors can reduce the angle of direct sunlight to the eyeballs, so that the driver will not affect his vision when looking in the rearview mirror because the light is too strong.

<> "What's the use of black dots on a car.

1. Beautiful. The black dots on the car glass have a magical function that is beautiful, and the small black dots have perfectly become excessive colors, so that the car will be much better in terms of overall visual sense.

On some models, due to the various electronic equipment. Flow** rearview mirror, rain sensor will have a certain sense of abruptness when installed on the glass alone, very incongruous, the appearance of black spots can just shield this sense of abruptness, and it is better in terms of visual experience.

2. Protective glass.

This is a little complicated, when the car glass is produced, the glass should be heated, and the appearance of black spots is to make this heat evenly distributed on the glass, otherwise it is easy to cause glass deformation and lose its original shape. Muffled beating.

Another point is that in the later use, the sunlight is constantly exposed to the glass, the heat absorption capacity of the glass is strong, the temperature rises quickly, and the overall thermal expansion coefficient is different. The surrounding glass will squeeze into the middle, and there is a high risk that the glass will be damaged. The black dots are also used to protect the glass by heating more evenly in the later stage.

Nowadays, almost all glass has black spots, you can pay attention to it when you look back.

Second, it's not just cars that have this design.

Since the black dot design is so powerful, it must have been applied elsewhere as well. Black dots can also be seen on the glass on the bus.

Its shadow can even be seen on high-speed trains

Three, but not all of them have black spots.

If you are careful enough, you will find a problem, you can see the glass with black spots on the front and rear windshields, why there are no black spots on the glass on the doors? Could it be that the glass on the door is not afraid of heat?

Of course, the glass on the door is sensitive to heat, and it can also be damaged due to this uneven heating. However, the biggest difference between the door glass and other glass is that the door glass has a large space, which means that there is a certain amount of redundancy. Both the front and rear windshields are fixed on the body, and there is no extra space to allow it to deform, so the requirements for the amount of deformation are extremely strict.

So you will find that the glass that cannot be opened and closed on the car has black spots, and the glass that can be opened and closed basically does not have black spots.

Friends who cherish the car more or use the car more carefully may notice that behind the front windshield ** rearview mirror, there are small black dots on the glass, what is this black dot for? Of course, not all cars have it, the Audi A6 and BMW X1 don't, here are just the majority. Today, we will explain this problem from multiple angles and in a more scientific way.

If you've heard about the role of these little black dots, such as transmitting sensing signals through this area or for electronic capture, these claims are actually unscientific. The correct interpretation should be this.

1. For the sake of beauty and ugliness

The installation of automobile glass is fixed by glass glue, and no matter how good the mechanized glue is, you can see the uneven distribution of glue when you put the glass on it. Therefore, the use of black bars can effectively solve this defect, and it can also block direct sunlight from glass glue to avoid accelerated aging. In addition, these black dots can cover the gaps in the interior around the windshield, and if they are fully transparent, the gaps in the carport and the edge of the dashboard of some cars will be exposed, which will affect the aesthetics.

2. In order to prevent refraction of the glass edge

Another reason is to avoid the refraction of light on the edge of the glass, forming light spots on the surface of the glass, affecting the driver's driving, and also for safety. The main component of this black spot is not ordinary black ink, after tempering, the ink and glass are sintered together and cannot be scraped off.

3.Reduces heat absorption and makes the glass more durable

Then this black dot can also make the front windshield more durable, your sunlight on the glass also has a temperature, transmitted to the glass, if the heating is uneven, it may also cause the glass to burst.

You just think of our ordinary glass, and suddenly pour hot water, and the cup has a certain chance of snapping and breaking.

So this little black dot absorbs the heat faster, and then stores the heat in the black dots of different sizes, and if you look closely, the point closer to the edge is bigger, and the point closer to the center is smaller, which is quite interesting.

The above is the function of the black dot on the glass, I believe everyone will understand it here? Some Audi or BMW windshields do not have black spots because the glass they use has been specially treated and does not need to consider the above three situations.

Summary. The dots around the car glass window have a greater effect, which is a process of protecting the glass, first of all, the specific heat capacity of the glass is much larger than the body, and the glass of the vehicle (especially the front and rear windshields) are fixed with glue, the vehicle is irradiated by the fierce sun, the glass will expand with the increase of the temperature of the metal frame, and the middle part of the glass is much smaller than the surrounding because of the light transmission, the difference in temperature makes the expansion of the glass inconsistent, and it is easy to damage the glass.

Hello, dear. The question you consulted, here is the following solution to the vertical answer: These small black dots are used to block the sun.

The dot matrix design of the small black dot effectively avoids the driver's eyes from being dazzled by the sun when looking at the rearview mirror, which can ensure the driver's good vision and ensure driving safety.

The dots around the car glass window have a greater effect, which is a process of protecting the glass, first of all, the specific heat capacity of the glass is much larger than the body, and the glass of the vehicle (especially the front and rear windshields) are fixed with glue, the vehicle is irradiated by the fierce sun, the glass will open its eyes and expand with the increase of the temperature of the metal frame, and the middle part of the glass is much smaller than the surrounding because of the light transmission, the difference in temperature makes the expansion of the glass glass is inconsistent, and it is easy to make the glass damaged.