Sony filed a patent for a new motion tracking controller:
he Unwired View found that U.S. Patent application 20060282873 was published for Sony on December 14, 2006 for a “Hand-held Controller Having Detectable Elements for Tracking Purposes.” The patent was originally filed on May 8, 2006 -- exactly one day before the Wii controller was publically demonstrated at E3.
An array of photonically detectable elements, likely to be LEDs, can be mounted or built into a game controller and be sensed by an image capturing device when the elements are oriented at least partly towards the screen.
The image-capturing device proposed in the patent is a camera, though it is unclear if it is a traditional camera like the EyeToy peripheral for PS2. As stated in the patent’s description..