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US 2009/0153627 A1Published application
Drop Charge and Deflection Device for Ink Jet Printing
AssigneeImaje S.A.
InventorBruno Barbet
Life of this patent
Estimating the term…
Abstract
Ink jet printing method, in which the jet (14) is broken up in small and large drops at a fixed point (B), and the drops (16a, 16b) are charged according to the length (l, L) of the break segment (18), in other words according to their diameter. This configuration overcomes transition problems. The charging means (22) can also selectively deflect drops (16b).
Claims13
Device for selective charging of conductive liquid drops including:
- a pressurised liquid reservoir comprising at least one ejection nozzle of the liquid in the form of a continuous jet;
- means of disturbing the jet and thus generating jet segments with adjustable length between a first length and a second length greater than the first length, the jet break up point being approximately at the same distance from the nozzle for all segments;
- charging means brought to a constant potential to transfer an electrical charge to a jet segment, the charge transfer being different depending on the length of the segment, comprising a first charging element extending over a first thickness along the trajectory of the jet from the break up point, and a second charging element downstream of the first charging element along the trajectory of the jet.
Method for selectively charging drops depending on the length of the segment from which they are issued, comprising:
- the formation of a continuous jet of conductive liquid derived from a pressurised chamber;
- disturbance of the jet to generate segments with first length and segments with second length greater than the first length by breaking up the jet at a fixed point;
- charging the segment derived from the breaking up by an electrical field according to its length.
Dependencies are inferred from the claim text.