Konica-minolta Holdings, Inc.

Konishiroku Photo Industry Co., Ltd.

Konica Corporation

Yoshio Takeuchi

Katsuaki Komatsu

Yoshiaki Kimura

Hiroyuki Nomori

Kazuo Asano

Akihiko Tamura

Yoshitaka Yasufuku

Kunio Ito

Shinichi Nishi

Shozo Kikugawa

Takemasa Namiki

Tatsuo Yajima

Katuichi Kawabata

Kunihiro Yamauchi

Taneji Morishita

Takao Yamaguchi

Mikio Yamada

A liquid droplet jetting head, having: a plurality of dividing walls to divide a plurality of flow channels, wherein at least a portion of the dividing wall is formed with a piezoelectric element; a flow path having a rectangular tubular from formed by an upper wall to close an upper surface of the flow path along an array direction of the plurality of the flow paths, and a lower wall to close a lower surface of the flow path; a nozzle to jet liquid in the flow path as the liquid droplet; and two driving electrodes formed independently on each wall surface of the dividing wall in a longitudinal direction of the flow path having the rectangular tubular form, wherein the nozzle is formed on either the upper wall or the lower wall.

Liquid jetting head and liquid jetting apparatus

A liquid droplet ejecting apparatus having: a liquid droplet ejecting head; and a drive pulse generating unit, wherein the head includes: a nozzle; a pressure chamber which communicates with the nozzle; and a pressure applying section which changes a pressure in the pressure chamber, wherein the generated drive pulse is applied to the pressure applying section so as to change the pressure in the pressure chamber to cause the liquid in the pressure chamber to be ejected from the nozzle, and wherein the drive pulse includes a rectangular expansion pulse which causes expansion and then contraction of the volume of the pressure chamber and in which the pulse width PW of the expanding pulse is set so as to satisfy the following conditional equation, 

Liquid droplet ejecting apparatus and liquid droplet ejecting method

An inkjet recording head for ejecting ink, having a plurality of piezoelectric sidewalls to form a plurality of ink channels; a piezoelectric bottom plate; and a plurality of electrodes All of the ink channels are divided into two or more groups of ink channels composed of ink channels between which at least one ink channel is sandwiched;

Inkjet recording head

A method of manufacture an ink jet head in which an ink is jetted from a nozzle hole by applying an electric voltage to an electrode so as to deform ink chambers divided by a partition wall. The method includes the steps of providing plural piezoelectric base plates having polarization side by side on a first non-piezoelectric plate, forming plural grooves for the ink chambers on the piezoelectric base plates and at connecting portions where each edge of the plural piezoelectric base plates provided side by side comes to face other edge; and mounting a second non-piezoelectric base plate on the plural piezoelectric base plates as so to cover the plural grooves so that the ink chambers divided by the partition wall are formed.

Method of manufacturing ink jet head

An ink composition and method for ink jet recording are disclosed. The ink composition comprises a coloring agent and additives which are adjusted to bring the roundness of dots formed on a recording medium, such as paper, of from 50 to 80 g/m.sup.2, to be at least 0.75 where said roundness (D) is represented by the formula

Ink composition and method for ink jet recording

A method and apparatus for capping the nozzle of a print head of an ink jet recording device for ejecting ink droplets upon a recording medium which comprises capping means which covers the nozzle of the print head of the ink jet recording device for preventing dust from adhering to the nozzle and for eliminating bubbles from getting into the nozzle to prevent the recording ink in the print head from evaporating in combination with purging means composed essentially of suction tube for purging the nozzle of the print head, and which method comprises installing the capping means at a position outside the area of printing of the recording device, and moving the print head to this position when no recording is performed to cap the nozzle face of the print head.

Method and apparatus for capping a nozzle of ink jet recording device

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Hachioji, Japan

Yoshio Takeuchi