Pentel Kabushiki Kaisha

Hiroshi Kobayashi

Kiyomi Abe

Mitsuo Kazama

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.

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Koshigaya, Japan

Hiroshi Kobayashi