G - Physics – 09 – G
Patent
G - Physics
09
G
375/46, 340/134.
G09G 1/06 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1229442
COORDINATE POSITION DIGITIZING SYSTEM ABSTRACT OF THE DISCLOSURE A coordinate position digitizing system comprises a position determining plate having a plurality of conductors extending parallel with one another at regularly spaced intervals, driving and controlling means for supplying with a constant current selectively to the conductors one after another within a horizontal scanning period in relation to a cathode ray tube which is used with the system, magnetic flux detecting means for detecting magnetic flux on the position determining plate, band pass filter means provided to be supplied with the output of the magnetic flux detecting means for eliminating a noise component resulting from magnetic flux of the deflection magnetic field provided to the cathode ray tube from the output of the magnetic flux detecting means supplied thereto, and information producing means for producing positional data defining a position of the magnetic flux detecting means on the position determining plate in response to the time having lapsed from a instant at which one or the conductors located at the starting end of the position determining plate is supplied with the constant current in the horizontal scanning period to another instant at which an output of the band pass filter means first crosses over a predetermined level in a predetermined direction in the same horizontal scanning period.
439478
Kitamura Nobuo
Sakano Akio
Shikakura Kunio
Tamaru Hideshi
Yoshida Kimiyoshi
Gowling Lafleur Henderson Llp
Sony Corporation
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