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Mist Ink Printers

IP.com Disclosure Number: IPCOM000078438D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 3 page(s) / 70K

Publishing Venue

IBM

Related People

McCurry, RE: AUTHOR [+2]

Abstract

There is described a general printing concept and several ways to implement it. First the concept: Ink from a reservoir is transported to a mist generator (sprayer head) where small droplets of ink are formed. Due to their low-terminal velocity in air, they can be easily transported by air flow. The combined air and ink mist flow can either be directed at the paper or flow by it. printing is achieved by selectively depositing the ink droplets onto the paper. Various control means for the selective deposition of the droplets onto paper give rise to different implementations of the general scheme. Two versions are: 1. Electrostatic deflection of charged droplets, and 2. Electroionic control.

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Mist Ink Printers

There is described a general printing concept and several ways to implement it. First the concept: Ink from a reservoir is transported to a mist generator (sprayer head) where small droplets of ink are formed. Due to their low-terminal velocity in air, they can be easily transported by air flow. The combined air and ink mist flow can either be directed at the paper or flow by it. printing is achieved by selectively depositing the ink droplets onto the paper. Various control means for the selective deposition of the droplets onto paper give rise to different implementations of the general scheme. Two versions are: 1. Electrostatic deflection of charged droplets, and 2. Electroionic control.

Fig. 1 illustrates the electrostatic deflection technique. The figure shows a single character parallel porous collector Mist Ink print head. The charged mist enters at the left and is transported by air flow through the control head. The charged mist can be produced by any of a number of techniques such as electrostatic spraying, or atomizing with subsequent charging by passing through a corona discharge, etc. Electrical potentials applied to the control electrodes 5 produce electric fields between the electrodes and the porous collector 7. Charged droplets move toward the collector as a result of the electric field. Hence, transmission of ink droplets through each section of the head is controlled by applying potentials to the control electrodes.

The use of a porous collector is purely illustrative, and other means can equally well be used to return the liquid ink to the reservoir. As a second example, the collector may consist of a flat smooth conductive plate on which the mist deposits. The small mist droplets tend to coalesce into distinct larger droplets. Air flow in the channel drives the larger droplets along the plate in a rolling motion to the plate edge, where it is collected by using slight vacuum. As a third example, the collector can consist of a fine mesh screen with vacuum used to extract ink droplets that strike the screen. The transmitted droplets are deposited on moving paper to form printed characters, symbols or other markings. The mist deposited on the porous collector is returned to the bulk liquid state and...