Passive fiber optic keyboard

Details Passive fiber optic keyboard Passive fiber optic keyboard

1981-11-13

1984-04-10

Crosland, Donnie L.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 340365P, 340365E, 200DIG47, 250200, 250578, 364713, 400478, G06F 302, G08C 900

Patent

active

044424256

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.

REFERENCES:
patent: 3129395 (1964-04-01), Mason
patent: 3750150 (1973-07-01), Cramer et al.
patent: 4298861 (1981-11-01), Tellerman
IBM Technical Disclosure Bulletin, Uberbacher, vol. 17, No. 3, Aug. 1974, "Optical Keyboard".

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