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Ink Jet Drop Size Sorter

IP.com Disclosure Number: IPCOM000079094D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Saltz, F: AUTHOR

Abstract

In ink jet printing, oversize and undersize drops (satellites) are frequently formed. If these improper size drops pass through the deflection system, the charge-to-mass ratio will be more or less than it should be and the drops do not strike the paper at the prescribed location.

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Ink Jet Drop Size Sorter

In ink jet printing, oversize and undersize drops (satellites) are frequently formed. If these improper size drops pass through the deflection system, the charge-to-mass ratio will be more or less than it should be and the drops do not strike the paper at the prescribed location.

These results are obviated, as shown in the drawing, by interposing a chamber 10 between the charging electrode 12 and the deflection electrodes 14. The chamber has a charged screen 16 which attracts the drops downwardly. Drops (a) of the correct size and having charges within the permissible range follow such a path that they pass through an aperture 18 in the end wall 20 of the chamber, and thence to the deflection plates 14. Drops (b) that are too large are not deflected enough, and drops (c) that are too small are deflected too much, and do not get through the aperture 18. They are removed through conduit 22 by a pump.

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