High precision coordinate input device using sequentially driven

Details High precision coordinate input device using sequentially driven High precision coordinate input device using sequentially driven

1986-11-25

1989-04-04

Leung, Philip H.

Registers

Coded record sensors

Particular sensor structure

178 19, G08C 2100

Patent

active

048188514

ABSTRACT:
A coordinate input apparatus for detecting a coordinate position on the basis of a signal detected by a coordinate designator which can freely point on an input surface in which a plurality of conductors are embedded in parallel to each other, the conductors constituting in combination a main loop to which scaning signals are supplied sequentially. A compensating loop which is composed of a conductor is provided in the vicinity of a common conductor of the main loop separately therefrom such as to surround the main loop. A constant current is delivered to the compensating loop in the reverse direction to that flowing on the main loop to mitigate the magnetic field produced by a common conductor. A compensationg value which corresponds to the approximate position of the coordinate designator is called from a first storing means to calculate the interpolating value thereof. A correction value for correcting the error between the interpolating value and the actual position of the coordinate designator is called from a second storing means in order to specify the position pointed by the coordinate designator on the basis of the interpolating value and the correction value.

REFERENCES:
patent: 3828128 (1974-08-01), Dethloff et al.
patent: 4260852 (1981-04-01), Fencl
patent: 4692568 (1987-09-01), Morita
patent: 4713496 (1987-12-01), Kimura et al.
patent: 4740660 (1988-04-01), Kimura
patent: 4758690 (1988-07-01), Kimura

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