Thermal head and ink transfer printer using same

Details Thermal head and ink transfer printer using same Thermal head and ink transfer printer using same

B - Operations, Transporting

41

J

B41J 2/35 (2006.01) B41J 2/005 (2006.01) B41J 2/325 (2006.01)

Patent

CA 2249234

In a thermal line head according to a first aspect of the invention, a monolithic electrical conductive pattern is formed on a base plate. The monolithic pattern includes plural sets of two electrodes, with a constriction extending between the two electrodes in each set. A cross-sectional area of the constrictions is smaller than that of the electrodes, whereby each of the constrictions serves as an electric resistance element. In an ink transfer printer, a frame, with an opening, is fixed on the thermal head such that the elements are included in the opening. A film sheet covers the frame, such that the opening is defined as an ink space, and plural pores in the sheet are arranged along an alignment of the elements, with at least one pore being allocated to each of the elements. When each of the elements is electrically energized to generate thermal energy, an ink drop appears on the film sheet from a pore corresponding to the localized generation of the thermal energy.

Un premier aspect de la présente invention a pour objet une tête d'impression thermique dont la plaque de base comporte un tracé de conduction électrique monolithique. Le tracé monolithique comporte plusieurs jeux de deux électrodes, une constriction séparant les deux électrodes de chaque paire d'électrodes. La section de surface de la constriction est plus petite que celle des électrodes, chacune des constrictions faisant ainsi office de résistance électrique. Dans une imprimante à transfert d'encre, un cadre doté d'une ouverture est fixé à la tête thermique, de telle sorte que les composants se trouvent compris à l'intérieur de l'ouverture. Un film recouvre le cadre, de telle sorte que l'ouverture définit un espace d'encrage; le film comporte plusieurs pores dont l'alignement correspond à la disposition des éléments, au moins un des pores en question étant consigné à chacun des éléments. Lorsque chacun des éléments reçoit une tension électrique aux fins de production d'énergie thermique, une gouttelette d'encre apparaît sur le film d'encrage depuis le pore correspondant au point d'origine de l'énergie thermique.

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