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TrackPoint design with improved comfort and traction Disclosure Number: IPCOM000014203D
Original Publication Date: 2000-Aug-01
Included in the Prior Art Database: 2003-Jun-19

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A concave shape for the TrackPoint input device results in more effective operation and increased long-term comfort. Long term usage of the convex type of trackpoint results in a sore finger. This is because of the way the TrackPoint device is shaped. Figs. 1 and 2 illustrate the side profiles of both types of trackpoint. Fig. 1 shows the smooth type, while Fig. 2 shows the rough type. 1 2 3 4 After continuous usage, by body oils and sweat causes the surface of the smooth type (Fig. 3) to become slippery. This requires additional downward pressure to operate. Eventually a bothersome "trackpoint-sized" depression appears on the operating finger. The rough type (Fig. 4) irritates the finger surface and renders it extra sensitive an unpleasant sensation. As with the smooth type, after continuous use, a trackpoint-sided indentation appears on the operating finger.