| 摘要 |
<p>PROBLEM TO BE SOLVED: To protect an internal device against a shock of falling, etc., without depending upon a buffering material by providing a shock buffering material which has a cracking breakage part in an enclosure main body and breaking the cracking breakage part by a shock. SOLUTION: A shock buffering member 43 is provided below an enclosure 41 and the cracking breakage part 44 is partially formed. Further, the cracking breakage part 44 consists of a notch 44a and a void part 44b provided nearby it. When the cylindrical or spherical void part 44b is provided atop of the notch 44a, a crack generated atop of the notch 44 reaches the void part 44b and then the load per unit area becomes small on the internal wall surface of the void part and is reduced, so that a plate will not be broken completely. Thus, the cracking breakage part 44 consists of the notch 44a and the void part 44b provided nearby it, so the enclosure is neither broken completely nor scattered and the shock energy is consumed. In this way, part of the shock energy is consumed by allowing the cracking breakage part 44 of the enclosure to crack from the tip of the notch 44a to the void part 44b and in the process of buckling deformation, the shock acceleration is attenuated to reduce the shock force to the internal device.</p> |
