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Drop Shutter for Ink Jet Printing

IP.com Disclosure Number: IPCOM000079736D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Fan, GJ: AUTHOR [+2]

Abstract

A high-speed circular capillary jet issues from a nozzle 1. By any one of a number of means the jet 2 is perturbed at a suitable frequency, so that it disintegrates into a uniformly spaced stream of uniform drops 4. These drops strike a target fluid surface 3. If the potential of the signal electrode 6 and the target are equal when a given drop collides with the target, it will rebound. On the other hand, if the signal voltage exceeds a certain critical value, the drop will merge with the target fluid mass and fail to rebound.

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Drop Shutter for Ink Jet Printing

A high-speed circular capillary jet issues from a nozzle 1. By any one of a number of means the jet 2 is perturbed at a suitable frequency, so that it disintegrates into a uniformly spaced stream of uniform drops 4. These drops strike a target fluid surface 3. If the potential of the signal electrode 6 and the target are equal when a given drop collides with the target, it will rebound. On the other hand, if the signal voltage exceeds a certain critical value, the drop will merge with the target fluid mass and fail to rebound.

It is believed that the attractive force between the polarized drop and its image in the target, accompanied perhaps with modification of the capillary energy by the impressed field, causes the merging. By the same argument, a magnetic field could create sufficiently large forces to control the merging or bouncing of a magnetic fluid drop.

Depending on the scheme of printing, the rebounding stream of drops with gaps may be deflected to form a matrix, or proceed directly to the printing medium. The salient feature of the system is that by applying an electromagnetic field, it is possible to convert a uniformly spaced drop stream to one that contains the proper intelligence for printing.

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