The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 1998
Filed:
Sep. 11, 1997
Joseph RR. Pankert, Aachen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
The device comprises a recording head including: a chamber plate having oppositely situated first and second faces, pressure chambers being formed as through holes extending between the first and second faces of the chamber plate, the pressure chambers being arranged in substantially parallel first and second rows; a nozzle plate attached to one of the faces of the chamber plate, said nozzle plate comprising a number of nozzle openings corresponding to the number of pressure chambers, each nozzle opening communicating with one of the pressure chambers; a piezoelectric actuator element associated with each pressure chamber, said actuator element having an active direction and comprising at least one layer of piezoelectric material and at least two electrode layers which are arranged such that the dimension of the actuator element in the active direction is varied upon application of an electric voltage between the electrode layers, the actuator element being arranged in cooperative relationship with the associated pressure chamber so that the pressure chamber changes its volume when the dimension of the actuator element in the active direction is varied. The recording head further comprises ink supply means provided at the faces of the chamber plate, said ink supply means comprising four ducts extending substantially parallel to the rows of pressure chambers, each pressure chamber communicating with the ink supply means via an ink supply channel. The first and second ducts are provided at the first face of the chamber plate and the third and fourth ducts are provided at the second face of the chamber plate. The second, fourth, sixth, etcetera pressure chambers of the first row communicate with the first duct, the second, fourth, sixth, etcetera pressure chambers of the second row communicate with the second duct, the first, third, fifth, etcetera pressure chambers of the first row communicate with the third duct, and the first, third, fifth, etcetera pressure chambers of the second row communicate with the fourth duct. As a result, full colour printing is possible with only one recording head.