Ink jet printhead having compensation for topographical...

B - Operations – Transporting – 41 – J

Patent

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Details

B41J 2/135 (2006.01)

Patent

CA 2125306

An improved thermal ink jet printhead is formed by the alignment and bonding of an anisotropically etched silicon wafer channel plate, containing a plurality of channel grooves, to a silicon wafer heater plate, containing a plurality of heating and addressing elements which are covered by a patterned thick film layer. The printhead enables better bonding of the two plates by compensating for raised lips or edges formed on the outside edge of opposing last pits in an array of pits located in the thick film layer that are created while photofabricating the pits in the insulating layer. The fabrication sequence compensates for the raised edges by including a non-functional straddling channel that nullifies the standoff created by the raised edge and a corresponding additional non- functional pit that positions the raised edge away from the functional channels and nozzles.

Cette invention concerne une tête d'imprimante thermique à jet d'encre améliorée obtenue par alignement et collage d'une tranche de silicium à canaux multiples réalisé par gravure anisotrope sur une tranche de silicium génératrice chaleur comportant plusieurs éléments chauffants et d'adressage recouverts d'une couche épaisse à motifs. La tête d'imprimante se prête à un collage amélioré par compensation des lèvres ou bords relevés qui se forment du côté extérieur des première et dernière dépressions d'une série ménagée dans la couche épaisse isolante par photolithographie. La séquence de fabrication adoptée compense pour les bords relevés au moyen d'un canal chevauchant non fonctionnel qui annule le jeu normalement créé par le bord relevé entre les deux tranches et au moyen d'une dépression additionnelle non fonctionnelle correspondante qui déporte les bords relevés à l'extérieur des canaux et buses fonctionnels.

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