Patent ID: 9720525
Date: 2017-08-01
CPC Classifications: G06F,G09G

Claim:
1. A cursor maneuvering device, comprising a cavity within which is located a light source and an image sensor, wherein said cavity is covered by a semi-transparent plate having an outer surface and an inner surface and wherein said outer surface is a Lambertian surface and wherein said inner surface is capable of being illuminated from within by said light source and, when said illumination occurs, said illumination also strikes said Lambertian surface and a bright reflection is radiated from a pointing device moving arbitrarily while in contact with said outer Lambertian surface wherein said bright reflection is characterized by a well defined contour that is detectable by said image sensor and is distinguishable from the contours of images formed by ambient illumination of arbitrary intensity and frequency from background objects external to said device and not in contact with said Lambertian surface and, thereby, said image sensor detects no well defined contour patterns from said external objects and said bright reflection from said pointing device produces an electrical response with steady, high signal-to-noise ratio as said pointing device moves while in contact with said Lambertian surface, wherein said cursor maneuvering device is capable of controlling a cursor on a display screen of an electronic device coupled to the cursor maneuvering device.