ADcase (active damping case) is a very innovative handphone case invented by a German engineering student called Philip Frenzel. It has just won an award from German Mechatronics Society.
The phone case has special shock-absorbers made with metal springs at its 4 corners. In normal situation, the shock-absorbers are hiding inside the case, and the case just looks like other normal handphone cases.
When sensors inside the case detected that the phone is on free fall dropping, it will immediately unfold the metal springs before hitting the ground. In this way, it can effectively protect the phone from damage due to dropping.
After the falling, the dampers can be manually folded back into the case and are therefore reusable.
You can watch the video below to see how ADcase reacts when the phone is dropping.
Very brilliant idea, isn't it?