Back lighted, full travel push button membrane keyboard
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United States of America Patent
Stats
-
Dec 18, 1984
Grant Date -
N/A
app pub date -
Jan 11, 1984
filing date -
Jan 11, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A keyboard having a side-lighted transparent support plane including a plurality of light-pipes vertically projecting therefrom through an overlying foam over-travel pad. A pair of patterned membrane switch layers, separated by a low density foam spacer, overly the over-travel pad and are positioned relative to a plurality of key-caps slidably mounted to the light-pipes. The sensation of key travel is achieved via the over-travel pad and/or a foam spring mounted beneath the key-caps with switch contact being made intermediate full key depression. An audible click is achieved via overlapping slidably abrasive projections.
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