Patent ID: 7298362

Claim:
A pointing device, comprising a housing; a first convex lens located upon the housing such that an object may be placed on the first convex lens, said first convex lens having two convex surfaces; a light source within the housing arranged to project light on the first convex lens; a sensor located within the housing for sensing light reflected from the object when the object is placed on the first convex lens; a second convex lens located between the first convex lens and the sensor for focusing light reflected from the object onto the sensor; wherein said first convex lens and said second convex lens are arranged such that when an object contacts the first convex lens, light projected by the light source and reflected by the object is clearly focused on and detected by the sensor through the second convex lens; and wherein when the object slides over the first convex lens, the sensor detects a new image position so as to generate a corresponding electronic signal for transmission to a computer system.