Patent ID: 7338151
Filing Date: 2008-03-04
Classification: B41J

Abstract:
1. A head for ink-jet printer comprising: a silicon substrate in which a plurality of ink nozzles and a plurality of ink passages each communicating separately to each of the ink nozzles are formed; an inorganic substrate which is joined with said silicon substrate and is provided with ink chambers each communicating separately to each of the ink passages; and a piezoelectric element of ferroelectric substance for changing separately a capacity of each of the ink chambers to jet an ink from said ink nozzles through said ink passages, wherein said silicon substrate includes a structure in which a plurality of silicon substrates of equal thickness are laminated; wherein said ink passages are fine as compared with said ink chambers and said ink nozzles are fine as compared with said ink passages, wherein said inorganic substrate has a common ink supply port for supplying ink to said plurality of ink passages at a portion on a surface of said inorganic substrate between a plurality of said piezoelectric elements, wherein said ink nozzles are disposed two-dimensionally side by side on a silicon substrate located on the most upper surface of said plurality of silicon substrates, wherein a plurality of said common ink supply ports are disposed two-dimensionally side by side on said inorganic substrate, and wherein a plurality of ink tanks commonly supplying ink to each of said common ink supply ports disposed side by side in one direction are disposed along the direction perpendicular to said one direction.