Browse Prior Art Database

Keyboard

IP.com Disclosure Number: IPCOM000093680D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Taris, JA: AUTHOR

Abstract

In this keyboard, depression of any key, one only being shown, permits coded electrical signals to be produced for operation of a controlled device. The keyboard includes a coding printed circuit board 10. The latter has the desired coding circuits 11 adapted to be closed by bridge contact 12 carried by the key stem. In order to insure that all circuits 11 are closed by contact 12 for generating the desired coded signals, the keyboard further includes a timing printed circuit board 13. This contains a conductive network 14 connected in series with the coding circuits. The key stem carries a second bridge contact 15 for closing network 14 after circuits 11 are closed. The key stem is returned by spring 16. A signal is provided only so long as the key stem remains depressed.

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Keyboard

In this keyboard, depression of any key, one only being shown, permits coded electrical signals to be produced for operation of a controlled device. The keyboard includes a coding printed circuit board 10. The latter has the desired coding circuits 11 adapted to be closed by bridge contact 12 carried by the key stem. In order to insure that all circuits 11 are closed by contact 12 for generating the desired coded signals, the keyboard further includes a timing printed circuit board 13. This contains a conductive network 14 connected in series with the coding circuits. The key stem carries a second bridge contact 15 for closing network 14 after circuits 11 are closed. The key stem is returned by spring 16. A signal is provided only so long as the key stem remains depressed. If desired, a timer can be additionally connected to the keyboard circuit for timing the duration of each generated signal.

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