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Encoding and Self Checking Keyboard

IP.com Disclosure Number: IPCOM000092982D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Hagopian, JJ: AUTHOR

Abstract

This key button assembly for an electrical readout selectively actuates conductors 31-38. In the retracted position, the key assembly is held upwardly by magnet 15. The lower assembly has one slanted surface 10 that carries a plurality of pairs of contacts 11, 12, and 13. On the other side is a surface 20 which carries a plurality of conductors 21 and 22. As in drawing 2, conductors 21 are electrically connected as are contacts 22. Likewise, contacts 11 are electrically connected as are contacts 12 and 13.

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Encoding and Self Checking Keyboard

This key button assembly for an electrical readout selectively actuates conductors 31-38. In the retracted position, the key assembly is held upwardly by magnet 15. The lower assembly has one slanted surface 10 that carries a plurality of pairs of contacts 11, 12, and 13. On the other side is a surface 20 which carries a plurality of conductors 21 and 22. As in drawing 2, conductors 21 are electrically connected as are contacts 22. Likewise, contacts 11 are electrically connected as are contacts 12 and 13.

Each conductor 33-38 is given a binary weight as shown in drawing 2. Depending upon the number of conductors that are or are not actuated, the character desired is determined. Conductor 32 represents the positive voltage supply. Conductor 31 represents a check to determine if all the contacts are connected to conductors.

When the assembly is lowered by pressure on key button 14, contacts 11 connect conductors 32 and 33, contact 12 connects conductors 34 and 36, and contact 13 connects conductors 38 and 31. These contacts are all positioned on surface 10. On surface 20, due to the depression of key 11, contacts 21 connect conductors 33 and 34 and contacts 22 connect conductors 36 and 38. Conductor 31 acts as a check since, if proper contact is made by contacts 11, 12, 13, 21, and 22, there is electrical contact between conductor 32 and conductor
31. Thus, conductor 31 can act as a check.

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