Coordinate position digitizing system

Details Coordinate position digitizing system Coordinate position digitizing system

1983-10-31

1988-03-01

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

178 18, 178 19, G08C 2100

Patent

active

047289449

ABSTRACT:
A coordinate position digitizing system to be used with a cathode ray tube, comprises a position determining plate having a plurality of conductors extending parallel with one another at regularly spaced intervals, and driving means for supplying a constant current selectively to the conductors, one after another, within a horizontal scanning period of the cathode ray tube. Magnetic flux detecting means detects magnetic flux on the position determining plate, and a band pass filter eliminates a noise component resulting from the deflection magnetic field of the cathode ray tube. Positional data defining a position of the magnetic flux detecting means on the position determining plate is produced in response to the output of the band pass filter.

REFERENCES:
patent: 3189889 (1965-06-01), Brigett
patent: 3728480 (1973-04-01), Baer
patent: 3873770 (1975-03-01), Iannou
patent: 4022971 (1977-05-01), Rodgers
patent: 4088842 (1978-05-01), Ikedo
patent: 4093947 (1978-06-01), Habeger, Jr. et al.
patent: 4206314 (1980-06-01), Prugh et al.
patent: 4591841 (1986-05-01), Gunderson et al.

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