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Browse Prior Art Database

Drop Selection for a Magnetic Ink Jet Printer

IP.com Disclosure Number: IPCOM000084060D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

A continuous magnetic ink jet stream 10 projected from nozzle 11 connected to a pressurizing source 12, is formed into a continuous stream of uniformly-spaced drops 13 by a drop generator 14. Individual drops 13 are diverted from the drop stream by timed pulses applied to windings 15 and 16 of dual-magnetic transducers 17 and 18, located in a common plane on opposite sides of the drop stream. A magnetic deflector 21 energized by a periodic scan signal from source 22 distributes drops 13. They form a predetermined pattern on a record medium 23. Diverted drops 19 continue on a path to either of the gutters 20.

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Drop Selection for a Magnetic Ink Jet Printer

A continuous magnetic ink jet stream 10 projected from nozzle 11 connected to a pressurizing source 12, is formed into a continuous stream of uniformly- spaced drops 13 by a drop generator 14. Individual drops 13 are diverted from the drop stream by timed pulses applied to windings 15 and 16 of dual-magnetic transducers 17 and 18, located in a common plane on opposite sides of the drop stream. A magnetic deflector 21 energized by a periodic scan signal from source 22 distributes drops 13. They form a predetermined pattern on a record medium
23. Diverted drops 19 continue on a path to either of the gutters 20.

The magnetic transducers 17 and 18 preferably take the form shown in Fig.
2. The drops 13 pass between the transducers 17 and 18 in the vicinity of the straight gaps 17a and 18a. Flux in the vicinity of the gaps 17a and 18a, when coils 15 and 16 are selectively energized, causes the drops 13 to be diverted toward the respective gap. By keeping angle alpha as large as possible, a relatively large drop deflection will be produced and flux loss through the opposing transducer will be minimized. The direction of current in the coils 14 and 15 should be such that the polarity remains the same (e.g., as shown) when pulsing one transducer and then the other.

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