Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-08-09
1987-08-25
Eisenzopf, Reinhard J.
Telegraphy
Systems
Position coordinate determination for writing
324207, G08C 2100, G01B 714
Patent
active
046894489
ABSTRACT:
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.
REFERENCES:
patent: 4482784 (1984-11-01), Whetstone
patent: 4514688 (1985-04-01), Whetstone
Barbetti Jamie L.
Snyder Edward J.
Eisenzopf Reinhard J.
Snow Walter E.
Summagraphics Corporation
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