Telegraphy – Systems – Position coordinate determination for writing
Patent
1998-04-02
2000-11-28
Shankar, Vijay
Telegraphy
Systems
Position coordinate determination for writing
178 1903, 178 1904, G08C 2100
Patent
active
061538361
ABSTRACT:
Capturing coordinate path data from a stylus moving across a surface of arbitrary size and shape. A first receiver is mountable to the surface, and is for receiving a first light beam from the stylus. A second receiver is also mountable to the surface, and is for receiving a second light beam from the stylus. The stylus either emits a plurality of divergent cones of light comprising the first and second light beams from an internal light source or provides at least one divergent cone of light comprising the light beams by reflection from at least one divergent light source that shines at least one divergent cone of light over the surface. The first light beam has a first angle with respect to a two-dimensional coordinate system defined within the surface, and the second light beam has a second angle with respect to the two-dimensional coordinate system. The first receiver determines the first angle, and the second receiver determines the second angle. A processor determines the position of the stylus given the first and second angles and the locations of the first and second receiver means in the two-dimensional coordinate system.
REFERENCES:
patent: 4688933 (1987-08-01), Lapeyre
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patent: 4814552 (1989-03-01), Stefik et al.
patent: 5248856 (1993-09-01), Mallicoat
patent: 5502514 (1996-03-01), Vogeley et al.
patent: 5717168 (1998-02-01), DeBuisser et al.
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