Digital tablet system with calibration means

Details Digital tablet system with calibration means Digital tablet system with calibration means

1980-06-23

1985-04-30

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

178 18, 33 1M, G01B 714, G08C 2100

Patent

active

045146888

ABSTRACT:
An improved position determination device utilizes an energized movable pointer which is inductively coupled to a grid of spaced parallel electrical conductors for each coordinate direction. The termini of the spaced conductors of each grid are traversed by a respective magnetostrictive element. Strain waves are propagated from the region where each magnetostrictive element is traversed by the respective energized conductors to a sensor and the time between arrival of the strain waves and the arrival of reference strain waves from reference points on the magnetostrictive elements is computed to determine the coordinates of the pointer.

REFERENCES:
patent: 2971171 (1961-02-01), Powell
patent: 3173131 (1965-03-01), Perucca
patent: 3648277 (1972-03-01), Whetstone et al.
patent: 4028619 (1977-06-01), Edwards
patent: 4071818 (1978-01-01), Krisst

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