Electrical position resolving by zero-crossing delay

Details Electrical position resolving by zero-crossing delay Electrical position resolving by zero-crossing delay

1976-06-24

1977-10-25

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

040557260

ABSTRACT:
Position responsive apparatus is disclosed comprising a sheet of uniform resistivity having four electrodes in contact therewith around a rectangular area. One pair of parallel electrodes are respectively energized with time-delayed voltage waveforms having linearly increasing portions, and then these voltage waveforms are instead applied to the other pair of parallel electrodes; and this procedure is repeated in sequence. A movable probe makes connection with the resistive layer. The voltage waveform picked off by the probe is found to have a time delay of zero-crossing, measured relative to the zero-crossing of the waveform applied at that time to one of the two electrodes, which is dependent solely upon the position of the probe in the direction perpendicular to that electrode. In this way, the position of the probe within the rectangle defined by the electrodes can be determined.

REFERENCES:
patent: 3342935 (1967-09-01), Leifer et al.
patent: 3509559 (1970-04-01), Leconte
patent: 3588345 (1971-06-01), Dym

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