A mouse controller includes a platform mounted on a base for a range of movement in a plane relative to the base of at least 1/2 inch (12.5 mm) in each of two different directions (preferably mutually perpendicular directions). A pair of flat, elongated coils (Lorentz voice coils) are mounted...http://www.google.co.uk/patents/US5790108?utm_source=gb-gplus-sharePatent US5790108 - Controller
