Obviously, this mechanism was Initially developed for existing Expert version 7 case, but advantages and new possibilities were greatly improved by creating completely new casing. Principle of operation is covered by US patent 8,502,781. But that device was mechanical with ball bearings, and I suppose it was not as easy to operate as #72327 with ruby gliding beads is. axis does not belong to Kensington: it was invented by Tektronix for its CAChe 3D trackball long before, and covered by US patent 4,952,919. Rest of data wasn't left unused: it provides third dimension of ball movement, Z axis - eliminating the need for dedicated physical control typically used for that purpose (scroll wheel, ring, or drum). The sensors used are standard laser mouse ones with two-dimensional output, but only single dimension per sensor is actually needed for pointer movement job here. The SlimBlade's ball is placed as low as possible: just about 1mm from underlying desk's surface.Īnother advantage of this design is also remarkable. In this design, the sensors should be located near equator of the ball, so nothing is mounted under it. To overcome this, very clever idea was implemented: two independent sensors, detecting X and Y parts of ball movement separately. In order to track correctly, optical sensor needs to be placed nearly under ball - and this requirement adds significant amount to the resulting device height. The goal of creating the lowest possible profile was successfully achieved by quite elegant solution. Most advanced Kensington trackball, released in 2009 and still top-of-the-line for last decade. Product Name: Kensington Slimblade Trackball
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