Matsushita Electric Industrial Co., Ltd.

Takuma Takasu

Hiroshi Shibata

Mamoru Soga

Hidekazu Arase

Mitsuhide Matsuda

Naoto Yoshida

In order to improve the water-resisting property of an image formed on a recording medium such as recording paper and plain paper by using an ink-jet recording ink, while also improving the light-resisting property of the image, an ink-jet recording ink, which contains a color material, water, a moisture-retaining agent, an organic silicon compound and an ultraviolet-ray absorbing agent, is allowed to contain an organic silicon compound in a range of 0.1 parts by weight to 50 parts by weight and an ultraviolet-ray absorbing agent in a range of 0.1 parts by weight to 10 parts by weight with respect to 100 parts by weight of the ink. The ultraviolet-ray absorbing agent is at least one compound selected from the group consisting of benzophenone-based, benzotriazole-based, cyanoacrylate-based and oxalic acid anilide-based compounds. Light energy of ultraviolet rays is converted to kinetic energy, heat energy and the like by the ultraviolet-ray absorbing agent at a predetermined concentration contained in the ink to prevent an amino group in the organic silicon compound from attacking an azo group in the color material due to the application of the ultraviolet rays. Alternatively, an ink-jet recording ink, which contains a color material, water, a moisture-retaining agent and an organic silicon compound, is arranged so that the organic silicon compound contains an ultraviolet-ray absorbing part, and the ultraviolet-ray absorbing part is prepared as at least one functional group selected from the group consisting of benzophenone-based, benzotriazole-based, cyanoacrylate-based and oxalic acid anilide-based functional groups. Alternatively, the ink is allowed to further contain an ultraviolet-ray absorbing agent having an acidic group.

Ink-jet recording ink, ink cartridge and recording device using such ink

A pair of opposed electrodes are formed on a circuit substrate by photolithography, and an insulation film is formed on the circuit substrate to cover said electrodes therewith. An opening is formed through the insulation film in such a manner that areas of exposure of the pair of electrodes through the opening are substantially equal to each other. A nozzle fluid passage substrate, having a nozzle and a pressure chamber communicating with the nozzle, is placed on the circuit substrate through an adhesive layer in such a manner that the pressure chamber is disposed substantially coaxially with the opening. Then, the circuit substrate and the nozzle fluid passage substrate are bonded together through the adhesive layer by application of heat and pressure, thereby producing a ink jet head for a printer.

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Fukuoka, Japan

Takuma Takasu