Keyboard, especially for electronic data-processing apparatuses
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Oct 29, 1992
filing date -
Apr 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A keyboard for electronic equipment screens off RF radiation by using a conductive housing (2), preferably made of extruded aluminum, which is closed off at its two ends by conductive end pieces (25) and which is closed off underneath by a conductive base plate (30). Key switches (9) extend through openings in a conductive frame (15) that is mounted inside the housing (2), which itself has openings (5, 6) for passage of the key switches (9). The elements are configured to reduce the level of any RF radiation that escapes from inside the keyboard. Among other advantages, this reduction of escaping RF radiation prevents illicit detection and decoding of information which is being entered via the keyboard.
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