Engineering/Mechanics of the Ipod
 

I was wondering if anybody has come across anything that could possibly detail the mechanics of the ipod mini touch wheel.

All I have found thus far is :

In the battle for thinness, Apple designers shifted to a rotary touchpad interface from the earlier mechanical scroll wheel. The new touch-scroll technology from Synaptics introduces a second board-adhesively bound to the upper plastic shell-for touchplate and supporting electronics. A single Synaptics ASIC and unique sawtooth electrode pattern are the main features of the touchpad board, which also serves to connect monochrome LCD and backlight.

Any more information would be helpful. Thanks!