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Ink Drop Deflection Correction

IP.com Disclosure Number: IPCOM000082792D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Lominac, HR: AUTHOR

Abstract

Drops among those intended for discard in ink jet printing and which have improper charges thereon or are of improper mass usually are not deflected to a gutter, but strike a recording surface at an erroneous location. These misregistrated drops can be redeflected during flight to the intended impact location on the record member, by providing an auxiliary set of oppositely poled deflection electrodes between the usual deflection plates and recording surface.

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Ink Drop Deflection Correction

Drops among those intended for discard in ink jet printing and which have improper charges thereon or are of improper mass usually are not deflected to a gutter, but strike a recording surface at an erroneous location. These misregistrated drops can be redeflected during flight to the intended impact location on the record member, by providing an auxiliary set of oppositely poled deflection electrodes between the usual deflection plates and recording surface.

In the figure, ink drops are produced from a regularly perturbed liquid stream issuing from nozzle 1 and are inductively charged or not charged at electrode 2. Thereafter, the drops pass between conventional deflection plates 3 and 4 and then between trajectory correction deflection plates 5 and 6, for impact either at gutter 7 or record member 8.

Uncharged drops follow a straight line trajectory along the X axis from the nozzle 1 to the record surface 8, while charged drops are intended for deflection to the gutter 7. However, during either the formation of the drops or charging, occasional drops will follow an initial trajectory along the early portion of the broken line and not reach the gutter 7. This may be due either to inadequate charge or small drop mass.

Drops which are insufficiently charged are given transverse accelerations with constant values of "a" and "b", respectively, between the first and second sets of deflection plates, where the direction of the accelerati...