TETE D'IMPRESSION A JET D'ENCRE

• Main Author: FRANCIS P. GIORDANO, LAWRENCE KUHN, RAMON LANE, CHEN-HSIUNG LEE ET GENE O. ZIERDT
• Format: Patent
• Language: French
• Published: 27.04.1979
• Subjects: CORRECTION OF TYPOGRAPHICAL ERRORS; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; PERFORMING OPERATIONS; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

Tête pour impression à jet d'encre. Elle est constituée par un corps 11 de rigidité élevée dans lequel sont taillées des encoches recouvertes d'une plaque 15 à gicleurs 17 alignés sur lesdites encoches, et par un transducteur 19 relativement mince par rapport au corps 11. Imprimantes. An ink jet printing head comprising a head body made from a material having high specific stiffness and the head body includes an ink passage which is kept small to retain the high body stiffness. The ink passage comprises a narrow slot connected with internal holes in the body which lead to ink inlet and exit ports. A nozzle plate having a plurality of orifices is fixed to the front of the head body and a piezoelectric crystal is fixed to the back of the head body. The piezoelectric crystal is kept thin compared to the head thickness, typically on the order of 1/20 to 1/30 of the body thickness, so that the effect of the crystal on the resonant characteristics of the assembly is kept small. The ink jet head provides a plurality of columns or jets of ink which are excited in such a way as to break up into uniformly and equally spaced drops at a fixed distance from the nozzle plate containing the orifices which produce the jets.