Digitizer tablet having high permeability grid shield

Details Digitizer tablet having high permeability grid shield Digitizer tablet having high permeability grid shield

1992-04-30

1994-10-18

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

053570618

ABSTRACT:
A combined shield member and grid shield for a digitizer tablet having conductive grids on a flexible substrate comprising a sheet of a metal having a high magnetic permeability substantially the size of a square X-Y axis coordinate system of the digitizer tablet shielding the flexible substrate. Preferably, the metal has an initial permeability of at least 5,000. The metal can be a NiFe alloy having an initial permeability sufficiently high to qualify it as a .mu.-metal. Typically, the sheet of metal is a square sheet of substantially the size of a square X-Y axis coordinate system of the digitizer tablet and the flexible substrate has edge portions which extend beyond side edges of the sheet of metal and are wrapped around the side edges. An alternate embodiment employs the high permeability shield positioned between two rigid substrates carrying the grids and interconnects respectively. A conductive metal foil over the surface of the substrate corrects any signal errors introduced by the shield. The foil can also be grounded for electostatic shielding.

REFERENCES:
patent: 4645869 (1987-02-01), Rockwell et al.
patent: 4704501 (1987-11-01), Taguchi et al.
patent: 5130500 (1992-07-01), Murakami et al.
patent: 5218173 (1993-06-01), Garwin et al.

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