Input mechanism for handheld electronic communication device

摘要

A handheld electronic communication device features an optically based user input device and navigation tool. In one embodiment, the optically based user input device features a translucent domed lens and a light source to illuminate a user's finger as the user slides his finger over the domed lens. In another embodiment, the optically based user input device features a translucent ball that the user rotates. In both embodiments, optical means are used to measure movement of the user's finger and translate that movement into a navigational command to the handheld electronic communication device. The optically based user input device is further configured such that an entry command is entered by depressing the optically based user input device.