Seiko Epson Corporation

Akio Yamamori

Kiyohiko Takemoto

Shuichi Yamaguchi

Yukiyoshi Icyu

Takeshi Kobayashi

Masanori Kamijo

Miharu Yoshida

Shuichi Yayaguchi

Kazushige Haketa

Haruhisa Uezawa

A liquid ejecting head unit includes: a liquid ejecting head that ejects a liquid through nozzles by driving a pressure generation element to cause the pressure within a pressure chamber to fluctuate; a flow channel member in which is formed a flow channel that supplies the liquid to a head flow channel of the liquid ejecting head; a substrate, mounted to a side surface of the flow channel member, on which is mounted an electrical component for supplying power to the pressure generation element; and a temperature measurement device provided on the surface of the substrate that faces the flow channel member. Here, the flow channel member includes an opening that passes therethrough toward the flow channel; and the temperature of the liquid within the flow channel is measured by the temperature measurement device that is provided facing the opening.

Liquid ejecting head unit

A photosensitive resin film is pressed onto the surface of nozzle plate , with one portion entering the inside of nozzle . Then, by ultraviolet radiation directed from the rear surface of nozzle plate , the inside the nozzle portion hardened as to form a plug , and at the same time the portion of photosensitive resin film directly above nozzle is hardened by the ultraviolet radiation to form an extensive portion , of a size at least that of nozzle diameter d, but no larger than 1.4 times that of nozzle diameter d. Finally, using the shape of extensive portion , an ink-repellent eutectoid plating coating layer is applied to the whole surface of nozzle plate with the exception of the edge of nozzle covered by the extensive portion, forming on that surface a water-repellent surface that does not cause deviation in the flight of ink droplets, while restricting the lining of the inside of nozzle with the coating layer.

Nozzle plate and method for surface treatment of same

A nozzle plate free from stray fly and defective jetting is achieved by a method which has a first step of putting a photosensitive resin film 5 in pressure contact with a back surface of a nozzle plate 1. A part of the photosensitive resin film 5 is caused to step into a nozzle 4 by controlling the viscosity thereof by changing temperature. Then, the thus processed photosensitive resin film 5 is hardened by injecting ultraviolet rays thereto. Next, a front surface 2 of the nozzle plate 1 is subjected to a eutectoid plating 6 process. By regulating a step coverage d of a part of the eutectoid plating 6 into the nozzle 4 by the hardened photosensitive resin film 5, a-nozzle plate having consistent nozzles, each being free from stray fly and defective jetting can be formed.

Nozzle plate for ink jet printer and method of manufacturing said nozzle

The entire part of a rear surface 2 of a nozzle plate 1 excluding peripheral portions 6 of nozzle holes 4 is coated with a resist tape, and this nozzle plate 1 is immersed in an electrolytic solution in which ions of a metal and particles of a water-repellent resin are dispersed to provide a plating thereon, and the plated nozzle plate 1 in the electrolytic solution is then heated to a temperature that is higher than a melting point of the water-repellent resin, whereby an entire portion extending from a front surface 3 of the nozzle plate 1 and the nozzle holes 4 contiguous to the front surface to the rear surface 2 is provided with a eutectoid plating layer 8 to suppress deviation of the passage of ink droplets due to wetting by an ink or the like.

Method of preparing the nozzle plate

Nozzle plate for ink jet recording apparatus and method of preparing

A photosensitive resin film is pressed onto the surface 1 of nozzle plate 1, with one portion entering the inside of nozzle, then by ultraviolet radiation directed from the rear surface of nozzle plate the intruded portion is hardened as plug, at the same time the portion of photosensitive resin film directly above nozzle being hardened by the ultraviolet radiation to form an extensive portion, of a size at least that of nozzle diameter, being no larger than 1.4 times that of nozzle diameter; finally, using the shape of extensive portion, an ink-repellent eutectoid plating coating layer is applied to the whole surface of nozzle plate with the exception of the edge of nozzle, forming on that surface, a water-repellent surface that does not cause deviation in the flight of ink droplets, while restricting the lining of the inside of nozzle with the coating layer.

A nozzle plate free from stray fly and defective jetting is achieved by a method which has a first step of putting a photosensitive resin film 5 in pressure contact with a back surface of a nozzle plate 1. A part of the photosensitive resin film 5 is caused to step into a nozzle 4 by controlling the viscosity thereof by changing temperature. Then, the thus processed photosensitive resin film 5 is hardened by injecting ultraviolet rays thereto. Next, a front surface 2 of the nozzle plate 1 is subjected to a eutectoid plating 6 process. By regulating a step coverage d of a part of the eutectoid plating 6 into the nozzle 4 by the hardened photosensitive resin film 5, a nozzle plate having a consistent nozzles, each being free from stray fly and defective jetting can be formed.

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Nagano, Japan

Akio Yamamori