Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-02-26
1986-10-07
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
178 19, G08C 2100
Patent
active
046161074
ABSTRACT:
Disclosed is a pattern input apparatus in which an input pen is made to be in contact with a tablet having a matrix composed of sets of conductors disposed at intervals along coordinate axes, thereby applying hand writing information to an electronic computer, or the like. In this pattern input apparatus, the input pen is made to be contact with or moved on the upper surface of the tablet to thereby obtain detection signals, the respective potential levels of at least three higher ones of the obtained detection signals being selected out, the detection signal having the highest potential level among the three selected out detection signals being regarded as a reference signal, subtraction being made between the reference signal and each of the remainder ones of the three selected out detection signals to obtain two potential differences, thereby determining the position of the pen on the basis of the ration between the two potential differences.
REFERENCES:
patent: 4507523 (1985-03-01), Gohara et al.
patent: 4554409 (1985-11-01), Mitsui et al.
Abe Kiyomi
Kazama Mitsuo
Kobayashi Hiroshi
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Pentel Kabushiki Kaisha
Schreyer Stafford D.
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