Telegraphy – Systems – Position coordinate determination for writing
Patent
1987-03-16
1988-03-29
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
047345462
ABSTRACT:
In a digitizer system, adjacent conductors in pairs are looped through four quarter sections of a grid active area in such a way that the unexcited polarities of the pair are different in each quarter section. A coil in a pen tip is moveable relative to the grid, and used to inductively couple signals in the conductors of the grid. The number of conductors required to span a given grid active area, and the number of multiplexers required to handle such conductors, are reduced by a factor of four. The polarities of signals induced in the conductors by the coil are selectively changed depending upon the quarter section in which the coil is located and sampled to coarsely locate the coil as being between two particular adjacent conductors. In the disclosed embodiment, a ratio of the magnitudes of the signals induced in the two particular conductors is then used to precisely locate the coil between these two adjacent conductors.
REFERENCES:
patent: 3819857 (1974-06-01), Inokuchi
patent: 4029899 (1977-06-01), Gordon
patent: 4418242 (1983-11-01), Kouno
patent: 4423286 (1983-12-01), Bergeron
patent: 4471162 (1984-09-01), Aono et al.
patent: 4560830 (1984-12-01), Perl
patent: 4570033 (1986-02-01), Hulls
patent: 4661656 (1987-04-01), Rodgers et al.
CalComp Inc.
Schreyer Stafford D.
LandOfFree
Digitizer system with loopback conductor grid does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digitizer system with loopback conductor grid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digitizer system with loopback conductor grid will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1090172