Nec Corporation

Junichi Fujisawa

Junichi Suetsugu

Kazuo Shima

Minoru Yamada

Yoshihiro Hagihara

Ryosuke Uematsu

Ryosuki Utmatsu

An ink jet print head comprises a substrate formed with a heating resistor, an ink path defining member for defining an ink supply path, and a orifice plate, and in the orifice plate, there is formed an ink outlet at the position opposing the heating resistor. Further, a heating zone surrounding the heating resistor is formed at the position corresponding to the heating resistor of the ink supply path. The channel resistance of the ink supply path is set so that a relationship is established between a quantity q of the discharged ink drop, a sectional area A of the ink outlet, and a maximal projection h that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged, such that 0<h<0.3 q/A. Consequently, there is obtained a high-speed printing of high quality without dispersion.

Ink jet print head

An ink jet head having a plurality of drive columns includes a plate having a plurality of diaphragm portions which are bonded to end surfaces of the drive columns with an adhesive, respectively. Each of the diaphragm portions is driven by a drive column corresponding to the diaphragm portion thereby to eject ink droplets. One of the diaphragm portion and the corresponding drive column includes an accommodating groove for accommodating an excess adhesive produced when bonding the diaphragm portion to the end surface of the drive column.

Ink jet head and method of fabrication thereof

An ink jet print head comprises a substrate formed with a heating resistor, an ink path defining member for defining an ink supply path, and a orifice plate, and in the orifice plate, there is formed an ink outlet at the position opposing the heating resistor. Further, a heating zone surrounding the heating resistor is formed at the position corresponding to the heating resistor of the ink supply path. The channel resistance of the ink supply path is set so that a relationship is established between a quantity q of the discharged ink drop, a sectional area A of the ink outlet, and a maximal projection h that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged, such that 0&lt;h&lt;0.3q/A. Consequently, there is obtained a high-speed printing of high quality without dispersion.

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Tokyo, Japan

Junichi Fujisawa