Position detecting apparatus

Details Position detecting apparatus Position detecting apparatus

1987-09-14

1989-11-07

Shoop, Jr., William M.

Telegraphy

Systems

Position coordinate determination for writing

341 15, G08C 2100

Patent

active

048785539

ABSTRACT:
A position detecting apparatus for detecting a position pointed by a pointer on a system such as a digitizer has the following parts: a position detection section having a plurality of loop coils arrayed in a side-by-side fashion in the direction of position detection; a selection circuit for successively selecting the loop coils one-by-one; a transmission circuit for generating an A.C. signal of a predetermined frequency to be delivered to the selected loop coil; a receiving circuit adapted to detect an induced voltage of a frequency substantially the same as that of the A.C. signal from among various voltages induced in the selected loop coil; a connection switching circuit for connecting the selected loop coil alternately to the transmission circuit and the receiving circuit; a position pointer having a tuning circuit including a coil and a capacitor and adapted to resonate with an electric wave produced by the loop coil which is supplied with the A.C. signal; and a processing device for determining the position pointed by the position pointer by processing signals representing the levels of voltages induced in the loop coils.

REFERENCES:
patent: 3299424 (1967-01-01), Vinding
patent: 4616106 (1986-10-01), Fowler et al.
patent: 4697050 (1987-09-01), Farel et al.
patent: 4713496 (1987-12-01), Kimura et al.

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