Passive fiber optic keyboard
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 10, 1984
Grant Date -
N/A
app pub date -
Nov 13, 1981
filing date -
Nov 13, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrically passive keyboard is provided with an array of keys. Each key is provided with an actuating bar which when depressed cooperates with a plurality of coded shutters. Each shutter is arranged to intercept a beam of light passing from light projecting elements to light collecting elements. Light pulses generated at a light source are coupled to the projecting elements with fiber optic cables. Decoding logic is coupled to the light collectors with fiber optic cables. Delay elements are provided in series in the fiber optic cables so that the decoding elements receives a plurality of binary coded light signals in a predetermined timed sequence which are converted into binary coded electrical signals at a point remote from the electrically passive keyboard.
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