Apparatus for determining a coordinate of a given point on a tab

Details Apparatus for determining a coordinate of a given point on a tab Apparatus for determining a coordinate of a given point on a tab

1985-09-10

1988-03-01

Gruber, Felix D.

Boots, shoes, and leggings

178 18, G08C 2100, G06F 1520

Patent

active

047291087

ABSTRACT:
A coordinate detection system is disclosed which comprises a pointer which is excited by current of a predetermined frequency. Two conductors are arranged on a tablet for producing voltages which depend on the position of the tablet at which the pointer is located. Selector wires are arranged at intervals of half cycles of the conductors and a processor computes the position pointed to on the tablet based on an output voltage obtained, while scanning selected selector-wire pairs, sequentially, from any selected selector-wire pair exceeding a predetermined set voltage. The processor provides an output indicating the phase difference between waveforms induced in said two conductors.

REFERENCES:
patent: 4205199 (1980-05-01), Mochizuki
patent: 4255617 (1981-03-01), Carau, Sr. et al.
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4507523 (1985-03-01), Gohara et al.
patent: 4575580 (1986-03-01), Jandrell

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