Coordinate input device

Details Coordinate input device Coordinate input device

1986-12-12

1987-12-01

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

047105950

ABSTRACT:
A coordinate input device is provided of the type comprising main loops made of conductors embedded parallelly in an input plane, a compensating loop disposed in the vicinity of the common wire of the main loops, switching elements for successively sending out a scanning signal to the individual main loops, a switching element for sending out a current to the compensating loop, a current drive circuit pertinent to the main loops, and a current drive circuit pertinent to the compensating loop, wherein a position is obtained on the basis of signals detected by a coordinate designating means capable of pointing out any spot on the input plane, which is characterized in that the output side of the main loops is connected with the input side of the compensating loop, whereby the total consumption power is not increased even by addition of the compensating loop.

REFERENCES:
patent: 3732369 (1973-05-01), Cotter
patent: 3904822 (1975-09-01), Kamm et al.
patent: 4054746 (1977-10-01), Kamm
patent: 4582955 (1986-04-01), Blesser

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