It is believed that many people have experienced the experience of driving their ordinary cars to 100 kilometres per hour, feeling that the cars are already a little fertilized, and that the noise is high, and that the mental need is highly concentrated; but if we switch to a hundred thousand, or even a million, good cars, and also to a hundred kilometres per hour, it feels very calm and quiet, and even feels that they are not fast enough to talk to the people around them。
At a time when a lot of people are murmuring in their hearts, is there any magic in the glass of this good car that can slow the speed
In fact, this feeling is not empty. This front windshield, which seems to be transparent, does have many doors, and it is what we often call “fast glass”。
However, it does not really slow the car down, but rather, through fine optical design, it gives us a brilliant “visional magic” in our eyes and brain。
To figure out how this magic works, we have to start with the glass itself。
Our car's front windshield is not a simple piece of glass, and it's called "clattering glass"。
Imaged as a sandwich, it uses two layers of solid steeled glass, with an elastic and viscous pvb film in its middle。
The primary task of such a structure is to ensure the safety of glass fragments that, when the glass is broken by a violent impact, are stuck to the middle film and do not splatter to the insiders, which is its basic function as a vehicle safety component。
And the mystery of it producing a "reducing" effect is hidden in its unique shape and optical properties。
In the course of manufacturing, the front windshield of a car undergoes a process known as the “hot bend” and is shaped into a curve with a given radians。
More crucially, the manufacturer, through extremely sophisticated controls, will allow the central area of glass to be slightly thinner than the marginal area。
It's very small, probably less than a millimeter, and our naked eyes are not able to detect it, but for the light that runs through it, this fine difference is enough to change their transmission path。
This structure, which is “middle thin and thick”, makes the entire front windshield optically form a very, very long dentary lens。
This is like putting on an extremely shallow “ear vision mirror” for a car。
When distant objects, such as mountains, towers or road signs, reach us with light through this particular glass, the imaging will be a little smaller and a little farther than the actual object。
And then it's our most sophisticated processor -- the brain。
We judge an object to be slow, largely dependent on the speed at which it moves in our vision, which is called an angle speed。
To give a simple example, a passenger aircraft flying at an altitude of 1,000 metres at an actual speed of 800 km per hour, but we look at it, but we feel like it creeps slowly in the sky。
And an electric car that flies from our side, probably at a speed of several dozen kilometres per hour, gives us a sense of “scrambling” that's gone。
That's because the farther away, the smaller the angle that objects sweep through our horizons, the slower we feel。
And that's what slowing glass uses, and it pushes far away through that tiny diaphragm effect, which reduces the speed at which they move in our vision。
When our brain receives the signal that things are moving slowly from afar, it makes a conscious judgement based on past experience: "well, it seems that the speed of the car is not fast, and everything is stable."
At the same time, the optical equilibrium of a high-quality glass is very good, which means that light passes through it with little distortion or distortion。
So, what we see through it will be very clear and stable。
This “clear stability of vision” stands in stark contrast to the “mixed flight” of the near-frozen fences, the green belt。
In this case, our brains are more inclined to believe in that clear and stable vision, thus reinforcing the psychological feeling of "fastness."。
Such visual “deception” not only makes us feel more secure and comfortable, but also helps to mitigate the visual fatigue and dizziness associated with the need for eyeballs to keep tracking fast-moving scenes, which is undoubtedly a significant contribution to the safety of motor vehicles。
Of course, the strength and weakness of this “reducing” effect is also directly related to the grade of the vehicle, or the cost of manufacturing。
Differences in the choice and configuration of glass are considerable for vehicles at different prices。
Cost control is the primary consideration for an economy-based car at a sales price of $100,000。
They use front windshields that meet, first and foremost, mandatory national safety standards, such as our gb 9656 car safety glass standard, to ensure that they are not problematic in terms of strength and resilience to shocks。
These glass also carry a certain radians and optical design that can provide a basic "reducing" visual effect, reduce the obvious distortion of light refractions, and allow drivers to feel relatively comfortable in their daily driving。
However, it is limited to costs, which may not be perfect in terms of optical homogeneity, curvature precision control and therefore relatively real。
When the price of vehicles rises to the intermediate level of 2. 3 million, there will be a significant improvement in quality in all aspects, including, naturally, glass。
The model at this level will be more sensitive to the comfort and advanced sense of driving。
The glass they use will be better performed in optical performance。
Here we have to mention our pride in china — the fu yoon group — as one of the world's largest car glass suppliers, which complements numerous medium- and high-end car brands at home and abroad。
These high-quality glass, which are more critical in selection materials and processing processes, are more effective in reducing the shaking and disfigurement of external scenes, making the driver's perception of speed more moderate and enhancing the aesthetic sense of high-speed travel。
The investment in front windshields is worth a lot of work for those luxury brand cars whose prices are close to millions。
This glass has long gone beyond a simple observation window to become a complex component that integrates a variety of high technology。
Not only do they use top-level raw materials and the most sophisticated processing processes to achieve near-optimal optical performance and minimize optical interference, they also integrate multiple functions such as sound insulation, insulation, etc。
For example, the addition of a special amphibious membrane to the pvb film of the sandwich structure, which forms a multilayered glue structure, can significantly discourage wind and environmental noise。
Some glass surfaces also have special metal coatings that reflect infrared and are insulated。
When you're in a car like this, it's like a moving super-high-level painting, stable and clear, and it's very quiet inside, and this double sense of visual and hearing silence can magnify the illusion of slowing。
As a result, travelling at 120 km/hour on the highway with such a vehicle would really have the illusion of driving 60 or 70 km on the road to the city, making the perception of speed rather “simplistic”。
This advanced optical technology is not only applied on board cars, but also plays an important role in our public transport, such as heavy iron and buses。
In particular, when we are flying at 350 kilometres an hour, we can still sit by our windows and read books and view things that are not transformed by super-high speed into an indistinguishable stream of light。
It creates a calm and comfortable space for passengers that is relatively isolated from outside high-speed movements, which is the best expression of the people-centred nature of science and technology。
