Device for determining position coordinates of points on a surfa

Details Device for determining position coordinates of points on a surfa Device for determining position coordinates of points on a surfa

1990-03-21

1992-06-09

Oberley, Alvin E.

Plant husbandry

178 19, G08C 2100

Patent

active

051209071

ABSTRACT:
A device for determining position coordinates of points on a surface, has a tablet containing plural number of equally spaced driver windings and plural number of equally spaced sense windings. Each driver winding has a pair of parallel conductors laid in X-direction, and each sense winding has a pair of parallel conductors laid in Y-direction. A current is generated in a cursor coil by the voltage induced from the current in a nearby situated driver winding. This current in the cursor coil induces a voltage in a nearby situated sense winding. The X-position of a sense winding in which a maximum voltage is induced, and the Y-position of a driver winding which induces a maximum voltage in the cursor coil, determine the position coordinates of the cursor on the tablet. Auxiliary sense windings are supplemented to the tablet. Induced voltages on these auxiliary sense windings determine the Y-position of the cursor regardless of its X-position, and reduce the overall time required for position determination.

REFERENCES:
patent: 3801733 (1974-04-01), Bailey
patent: 4704501 (1987-11-01), Taguchi
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4795858 (1989-01-01), Yamazaki
patent: 4848496 (1989-07-01), Murakami et al.

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