iPhone 5

歴史的背景

On September 12, 2012, Apple announced the iPhone 5. It has 4-inch display, up from its predecessors' 3.5-inch screen. The device comes with the same 326 pixels per inch found in the iPhone 4 and 4S. The iPhone 5 has the SoC A6 processor, the chip is 22 percent smaller than the iPhone 4s’ A5 and is twice as fast, doubling the graphics performance of its predecessor. The device is 18 percent thinner than the iPhone 4s, measuring 7.6mm, and is 20 percent lighter at 112 grams. The iPhone 5, as well as the iPod Touch (5th generation), and iPod nano (7th generation), feature a new dock connector named Lightning, which replaces the 30-pin Apple Dock connector introduced in 2003 by Apple on the iPod (3rd generation). The Apple Lightning connector has eight pins and all signalling is digital. This new connector is smaller than the previous one, helping the iPhone 5 to be slimmer than its predecessors. Apple Lightning cables have duplicate pins on two sides of each plug, so it can be inserted either way round. Various accessories will be available to convert the Apple Lightning connector to the older 30-pin Apple Dock connector or USB.