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US 4,671,688 AGranted
Shielded keyboard
AssigneeHoneywell Inc.
InventorDavid W. Brashears
Life of this patent
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Abstract
A shielded keyboard comprising a sheet of flexible fine wire mesh material between an array of keyboard contacts and an apposed array of switching actuators.
Claims1
A keyboard and means for preventing electromagnetic emissions from being radiated from said keyboard, said means including:
- a. a housing of electrically conductive and magnetically permeable material;
- b. an array of discrete electric current switch means mounted in said housing, said switch means being characterized by producing electromagnetic waves upon electric current flowing therethrough;
- c. an array of discrete switch actuators mounted respetively in apposition with said switch means;
- and
- d. an electromagnetic wave shielding sheet of flexible electrically conductive magnetically permeable fine wire mesh material, said shielding sheet being electrically connected to said housing and interposed between said switch means and said actuators, whereby said shielding sheet in combination with said housing functions to prevent electromagnetic waves from said switch means, as aforesaid, being radiated through said shielding sheet and through said housing.
2 more elements
Dependencies are inferred from the claim text.