OUTWARDLY DECREASING HEIGHT KEYS FOR A HANDHELD ELECTRONIC DEVICE KEYBOARD

摘要

A user input subassembly and method of constructing a user input subassembly for accommodating a navigational tool and keypad assembly. The user input subassembly can be integrated into a handheld wireless communication device. The user input subassembly includes a lightguide panel and trackball navigation tool. The lightguide panel is constructed so that the trackball navigational tool can be fixed to the lightguide panel through at least one releasing securement feature. This securement feature is likewise implemented on either the trackball navigational tool and/or a locking ring that at least partially surrounds the trackball navigational tool.