Browse Prior Art Database

Encoder

IP.com Disclosure Number: IPCOM000091461D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Harper, LR: AUTHOR [+2]

Abstract

The keyboard encoder uses a powdered iron U-I section for each key. U-shaped core 10 is fixedly mounted and I-section 12 is fixedly spring mounted adjacent the corresponding core 10. Depressing key 14 causes code bar 16 to move down and move the corresponding I-section to close the gap with core 10 to generate electrical signals representative of the code chosen for the actuated key. Excitation winding 18 is applied to each core 10. In addition, coded tapes 20 and 22 are provided for each bit. These tapes utilize printed conductor 24 which encloses each of the powdered iron cores. By selectively punching the conductor on one side or the other of the core, the conductor can be made to thread either through or around each of the cores and produce a corresponding electric signal chosen for each of the keys.

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Encoder

The keyboard encoder uses a powdered iron U-I section for each key. U- shaped core 10 is fixedly mounted and I-section 12 is fixedly spring mounted adjacent the corresponding core 10. Depressing key 14 causes code bar 16 to move down and move the corresponding I-section to close the gap with core 10 to generate electrical signals representative of the code chosen for the actuated key. Excitation winding 18 is applied to each core 10. In addition, coded tapes 20 and 22 are provided for each bit. These tapes utilize printed conductor 24 which encloses each of the powdered iron cores. By selectively punching the conductor on one side or the other of the core, the conductor can be made to thread either through or around each of the cores and produce a corresponding electric signal chosen for each of the keys. The tapes for each bit are connected in series-bucking to cancel stray signals. A high frequency signal is applied at terminals 26 and 28 to the excitation winding. A signal is detected at output terminals 30 and 32 from each of the tapes to produce electrical signals representative of the actuated key.

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