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Drop on Demand Magnetic Ink Jet

IP.com Disclosure Number: IPCOM000084909D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Fan, GJ: AUTHOR

Abstract

A drop on demand magnetic ink jet printer includes a head assembly 2 which includes two nozzle plates 4 and 6. The plates have back-to-back orifices 8 and 10 and are spaced from one another with a magnetic ink liquid layer 12 between the two plates. A magnetic ink supply 14 supplies ink to the head assembly 2.

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Drop on Demand Magnetic Ink Jet

A drop on demand magnetic ink jet printer includes a head assembly 2 which includes two nozzle plates 4 and 6. The plates have back-to-back orifices 8 and 10 and are spaced from one another with a magnetic ink liquid layer 12 between the two plates. A magnetic ink supply 14 supplies ink to the head assembly 2.

An electromagnet 16 is positioned in alignment with the orifice 10, with a paper 18 positioned between the plate 6 and the electromagnet 16. When the electromagnet 16 is pulsed by a pulse generator 20, the liquid 12 between the orifices 8 and 10 experiences a force towards the magnet, and a droplet is detached in a trajectory towards the paper 18.

The advantage of this approach with respect to other drop on demand ink jet printers is that the force applied to the ink 12 has to only overcome the barrier between the two states of surface tension at the orifices 8 and 10, rather than having to exert a force large enough to move the entire ink mass between the respective plates.

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