Summagraphics Corporation

Other

Edward J Snyder

Jamie L Barbetti

Stephen L Domyan

An automatic position coordinate determining device comprises a data tablet which has a single magnetostrictive element in which strain waves are induced for determining the position coordinates of a pointer relative to a pair of mutually orthogonal coordinate axes obliquely disposed with respect to the magnetostrictive element. Two mutually orthogonal pluralities of parallel equidistantly spaced electrical conductors form a grid network on the top surface of the tablet. These pluralities of conductors are wrapped around the edge of the tablet and spatially compressed to form respective X and Y conductor grids over opposing quadrants of the tablet bottom surface. A movable pointer travels along the top surface of the tablet while the magnetostrictive element is arranged along the diagonal of the tablet bottom surface. The conductors of the X and Y grids are inductively coupled to the diagonal magnetostrictive element. When the pointer is pulsed, a current pulse is induced in at least one electrical conductor of each plurality, following which oppositely propagating strain waves are induced in the magnetostrictive element by the pulsed electrical conductor. The propagation times of the strain waves are determined and the position coordinates of the pointer are calculated therefrom.

Position coordinate determination device with diagonal delay line

An automatic position coordinate determination device has a single U-shaped delay line made of magnetostrictive material. A grid network of electrical conductors including first and second pluralities of parallel conductors arranged substantially perpendicular to first and second coordinate axes respectively is inductively coupled to the delay line. A sensor coil is arranged at one end of the delay line for outputting a signal in response to the arrival of a propagating magnetostrictive strain wave induced by an energized electrical conductor. A movable flux-producing element is proximally arranged with respect to the grid network. When the flux-producing element is pulsed, at least one electrical conductor of each plurality is energized, which energized conductors in turn each induce a strain wave which propagates toward the sensor. The propagation times of the induced strain waves are processed to determine the position coordinates of the pulsed flux-producing element.

Two-dimensional position coordinate determination device with U-shaped

A position coordinate determination device employing duodatum digitizations for each coordinate of a pair of respective coordinates and a ratiometric proportionality calculation for calculating a corrected coordinate digitization value in each measured coordinate.

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Trumbull, CT, United States of America

Edward J Snyder