Shielding materials for electromagnetic digitizers

Details Shielding materials for electromagnetic digitizers Shielding materials for electromagnetic digitizers

1991-10-17

1993-06-08

Schreyer, Stafford

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

052181731

ABSTRACT:
Shielding materials used in electromagnetic digitizers which are packaged in a notebook computer environment. Shielding materials with sufficiently high magnetic permeability to increase the magnetic signal detected by the digitizer sensor grid can be used in such an environment, and can be placed in direct contact with the sensor grid. Aluminum or copper shields can also be placed in direct contact with the sensor grid to provide the requisite shielding. A combination of conductive and ferrite material can also be used as the conductive base material provides for shielding and a layer of ferrite material increases the magnetic signal and prevents signal attenuation by the conductor.

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patent: 4853497 (1989-08-01), Landmeier
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