Apple was today granted a 2009 patent application to allow users to control a device by pressing on, or squeezing, parts of the casing. An illustration in the patent shows potential touch-sensitive areas across a whole range of different devices:
Apple patents a great many technologies it never uses, either as potential solutions that are later rejected or to protect against competitor use, although the metal casing of the iPhone 5 could make the system practical on any future iPhone models with a similar casing.Sensors disposed within the housing, in some embodiments directly beneath the surface, can detect when deflection occurs, which in turn denotes stress or pressure. In some embodiments, the sensors are connected to a printed circuit board that can in turn illuminate a light or other indicator when a minimum amount of readable stress is applied ... A processor can take the measurements with their corresponding deflection rates, and translate them into device actions. For example, a threshold stress level is reached when a user presses down on a certain area of a device's housing. The processor determines that the capacitance change is outside the bounds of normal readings and can trigger a UI event or other device feature in response. The system can be customized to detect patterns and varied sensitivities to support a broad range of tasks.
Article Link: Apple Wins Patent for Pressure-Sensitive Device Casings