Mobile phone shell can automatically open shock absorbers when the phone drops

When we did not hold the phone and accidentally slipped off our hands, it seemed that the entire world had stopped. At this moment, the only thing we can hear is as if the heartbeats of our own hearts have become silent all around. All the cognitions have lost their function and the brain is even blank. When the mobile phone rotates in the air, there is only one idea in our mind. The screen must be broken and hundreds of thousands of screens must be changed for the mobile phone. I regret why I did not hold it. If it is lucky, the mobile phone's side frame will fall. Or the protective cover is thick enough. At most, there is a trace of bumping and there is no problem with the screen. But if the screen is on the ground first, then wait for our screen change.


However, the recent appearance of a mobile phone case with an active protection function can prevent this from happening. It looks a bit like a smartphone airbag, a shortcut to Philip Frenzel, an engineer at Aalen University in Germany. His idea won the highest award from the German Mechatronics Association, which considered the creativity of students from all over the country, and Frenzel's work was highly praised.

In fact, like us, Frenzel does not like to hide the charm of smart phones with various ugly cases, but if you can avoid breaking the screen of the mobile phone, you can give up the aesthetic requirements. After all, safety should be placed first. first place.


How does this mobile phone case judge when the phone is in a dangerous state before it ejects the elastic air bag? It turned out that he had a very unique judging mechanism. A sensor was installed inside the phone case to detect if the smartphone was in a free-fall state. If so, it would activate the next step.

The specific form of airbags, Frenzel tangled for a long time, and continue to improve. At first he wanted to install a real airbag on the smartphone, just like the airbag on the car. He later changed his mind and wanted a bubble-based alternative, or some other solution that he had considered, but was eventually abandoned by Frenzel.

In the end, he decided not to use a mechanism that was too soft and protective. In the end he chose this spring.


As we can see in the picture, there are 8 relatively thin metal coils in the case and are usually bent inside the phone case, but when the phone is in the air, these spring coils will open and protect. The edge of the cell phone protects it from shocks and can be talked on the ground without damaging the electronics.

After landing on the ground, if the phone does not break, we only need to fold the spring back to prepare for the next drop.

Of course, there is another concern. When the phone is still in your pocket, if you accidentally let the spring pop out, it's a rather awkward situation. The worst case is particularly embarrassing. We have some suggestions for improvement. For example, we can choose the proximity sensor of the mobile phone to see if it is in the pocket or in the bag.

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