Keyboard having keys activated by electrical contacts and the ca

Details Keyboard having keys activated by electrical contacts and the ca Keyboard having keys activated by electrical contacts and the ca

1982-06-23

1985-02-26

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

34082559, 340365S, 178 17C, G06F 302

Patent

active

045020400

ABSTRACT:
A keyboard having keys activated by electrical contacts and the capacity to read one state from among four possible states, wherein the keyboard is a dipole disposed between two terminals between which are positioned in parallel three connectors, each including one of the electrical contacts, two of these connectors including diodes mounted anode to cathode, in such a way that the various states may be discriminated by means of the successive application of two reverse electrical voltages (V1, V2) to the terminals of the dipole and the corresponding detection of the logic states of the contacts using a logic detector.

REFERENCES:
patent: 3216008 (1965-11-01), Goldhammer
patent: 3278687 (1966-10-01), Everett
patent: 3296383 (1967-01-01), Herter
patent: 3382322 (1968-05-01), Duerden
patent: 3508013 (1970-04-01), Monin
patent: 3557311 (1971-01-01), Goldstein
patent: 3855420 (1974-12-01), Steidl
Electronic Engineering, vol. 50, No. 609, Jul., 1978, Concannon: "Cheap Multiple Functions via Post Office Lines", pp. 33, 34.

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