Telegraphy – Systems – Position coordinate determination for writing
Reexamination Certificate
2005-01-11
2005-01-11
Shankar, Vijay (Department: 2673)
Telegraphy
Systems
Position coordinate determination for writing
C178S018010, C178S018030, C178S019010, C178S019020
Reexamination Certificate
active
06841742
ABSTRACT:
A presentation board digitizer system for large boards preferably employs at least three spaced-apart ultrasound receivers assemblies. A current position of an ultrasound transmitter is assigned as a weighted centroid of time-of-flight position measurements based on at least two pairs of receiver assemblies. The weighting used varies as a function of the position of the transmitter across the board. A preferred structure of an ultrasound receiver assembly for use in the system employs a pair of ultrasound receivers arranged side-by-side in a line perpendicular to the surface of the presentation board. The receivers are connected so as to generate a total output signal corresponding to the instantaneous sum of the ultrasound signals received at each, such that the receiver assembly is most sensitive to ultrasound signals incident from a plane adjacent to the presentation board. Also described are a transmitter device for use with a conventional pen in which the ultrasound transmitter is a cylindrical element lying coaxial with the pen and adjacent to its tip, and a jointed eraser structure.
REFERENCES:
patent: 499148 (1893-06-01), Gilchrist
patent: 5144594 (1992-09-01), Gilchrist
patent: 5637839 (1997-06-01), Yamaguchi et al.
patent: 6292177 (2001-09-01), Holtzman et al.
patent: 6424340 (2002-07-01), Holtzman et al.
Shenholz Gideon
Zloter Yitzhak
Inventek
Luidia Inc.
Rosenfeld Dov
Shankar Vijay
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