Browse Prior Art Database

Magnetic Ink Jet Printer

IP.com Disclosure Number: IPCOM000080270D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Chen, WH: AUTHOR

Abstract

In ink jet printers, ink droplets are frequently generated by pulsing an ink-filled chamber to forcibly expel droplets from a nozzle toward a recording surface. Frequently the energy propelling the droplets toward the recording surface is insufficient to overcome environmental interference, and hence results in poor print quality. Additional acceleration may be transmitted to ejected droplets by providing an auxillary magnetic field.

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Magnetic Ink Jet Printer

In ink jet printers, ink droplets are frequently generated by pulsing an ink- filled chamber to forcibly expel droplets from a nozzle toward a recording surface. Frequently the energy propelling the droplets toward the recording surface is insufficient to overcome environmental interference, and hence results in poor print quality. Additional acceleration may be transmitted to ejected droplets by providing an auxillary magnetic field.

In the figure, ink having magnetic particles therein, such as a ferrofluid, is supplied from a source 1 through duct 2 to a conical chamber 3 having nozzle 4. At the rear of chamber 3 is a circular flexible plate 5 to which piezoelectric ceramic disk 6 is cemented. Energizing electrical pulses are applied across plate 5 and ceramic disk 6, which creates buckling of the plate and forces a droplet of ink from the nozzle toward recording medium 8. A permanent or electromagnet 9 is supported behind record medium 8. As droplets are produced from nozzle 4, they enter the gradient magnetic field and are accelerated toward the magnet. This arrangement imparts additional energy to the droplets and improves printing reliability. The magnet is mounted so as to traverse the print line in synchronism with the ink jet nozzle.

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