Browse Prior Art Database

Hybrid Electrostatic Magnetic Ink Jet

IP.com Disclosure Number: IPCOM000083053D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Myers, RA: AUTHOR

Abstract

This is an ink jet printer which combines electrostatic raster deflection with magnetic binary selection for providing an electrostatic ink jet with a guard wake, that is low-aerodynamic interactions, and capability for 2-dimensional deflection.

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Hybrid Electrostatic Magnetic Ink Jet

This is an ink jet printer which combines electrostatic raster deflection with magnetic binary selection for providing an electrostatic ink jet with a guard wake, that is low-aerodynamic interactions, and capability for 2-dimensional deflection.

A magnetic ink is housed in a reservoir 2 and is forced under pressure through a nozzle 4, and is excited such that a synchronous drop stream is created by a magnetic exciter 6. Acoustic means may be used in place of the magnetic exciter 6.

At the point of drop breakoff, a periodic voltage is applied to an electrostatic charger 8 such that successive drops have a fixed charge increment. One such periodic voltage may be a sawtooth waveform, however, the efficiency of drop utilization may be improved if a more complex waveform is used.

The charged droplets are then passed through a magnetic selector 10, with the selector 10 being energized when a droplet is not to be used for printing, which droplet is then deflected to a gutter 14. Remaining droplets then pass through an electrostatic deflector 12, which deflects the droplets to the desired position on a printing medium such as a paper 16.

Since the described printer operates in a guard-wake mode, the use of correction circuits is minimized.

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