Fujitsu Corporation

Fujitsu Isotec Limited

Akihiko Miyaki

Masahiro Ono

Takumi Kawamura

Akira Iwaishi

Akio Yano

Masayuki Sasaki

Kazuaki Kurihara

Keiji Watanabe

Hiromitsu Soneda

Nobuo Kamehara

Yuji Yoshida

Motoyuki Nishizawa

Tomoyuki Akahoshi

Kouichi Sanpei

Mutsuo Watanabe

Kazuki Ogawa

Yasuo Numata

An ink drop is injected via a nozzle by changing drive voltages applied to a piezoelectric element to reduce the volume of a pressure chamber filled with ink, so that the injected ink drop hits upon a print medium to carry out printing. Upon injecting the ink drop via the nozzle, an injection timing of the ink drop is changed corresponding to a drive frequency of the drive voltages using a predetermined rule. The predetermined rule may be a table defined in terms of drive frequencies of the drive voltages and optimum injection timings of the ink drop corresponding to the drive frequencies.

Inkjet printing method and device

A halftone printing is realized by jetting ink drops of mutually different sizes toward a print medium. Among them, the ink drop having the middle size is set to be a reference ink drop for determining injection timings of the ink drops. When the ink drop to be jetted is bigger than the reference ink drop, an injection timing thereof is delayed relative to that of the reference ink drop. On the other hand, when the ink drop to be jetted is smaller than the reference ink drop, an injection timing thereof is advanced relative to that of the reference ink drop. This allows all the ink drops to be hit upon the print medium precisely at given positions.

The instant invention has an exemplified object to provide an inkjet head and recording device having such an inkjet head with a simpler structure as achieves higher quality of printing inexpensively than the conventional. The pressure-chamber plate of this invention is slit or divided into a plurality of elements.

Inkjet head formed of divided pressure-chamber plate, method for manufacturing the same, and recording device having the inkjet head

An ink jet head including a piezoelectric element having a displacing portion, a pressure chamber plate bonded to the piezoelectric element for defining a common ink chamber and a plurality of pressure chambers in cooperation with the piezoelectric element, and a nozzle plate bonded to the piezoelectric element and the pressure chamber plate and having a plurality of nozzles respectively communicating with the plurality of pressure chambers. Each pressure chamber is connected to the common ink chamber through a plurality of ink supply channels each having a substantially square cross-section.

Ink jet head and ink jet recording device

Each of common electrode teeth,-,-,and,-,, and each of individual electrode teeth,-,and,-,are alternately arranged in the X1-X2 direction at predetermined intervals g. When a positive voltage is applied to the individual electrode teeth,-,and,-,, an electric field,-,indicated by a line of electric force,-,is produced in a piezoelectric plate member,between the individual electrode tooth,-,and the common electrode tooth,-,and an electric field,-,indicated by a line of electric force,-,is produced between the individual electrode tooth,-,and the common electrode tooth,-,. Likewise, an electric field,-,indicated by a line of electric force,-,is produced between the individual electrode tooth,-,and the common electrode tooth,-,and an electric field,-,indicated by a line of electric force,-,is produced between the individual electrode tooth,-,and the common electrode tooth,-,. Depending on the piezoelectric constant d33, X1-X2 direction components of the electric fields causes the piezoelectric plate member,to expand efficiently, as indicated by numerals,-,-,. An expanding action of the piezoelectric plate member,causes a bimorph element,to bulge into a dome configuration.

Ink jet head providing improved printing resolution and printing speed

A piezoelectric type ink-jet printing head including a pressure chamber plate having a plurality of pressure chambers and a plurality of ink supply ports for supplying ink into the respective pressure chambers, a nozzle plate having a plurality of nozzles and a piezoelectric element having a surface, at least parts thereof defining a plurality of displacement portion. The nozzle plate is attached to one of the surfaces of the pressure chamber plate, in such a manner that the respective nozzles are connected to the respective pressure chambers. The other surface of the pressure chamber plate is attached to the piezoelectric element, in such a manner that each of the displacement portions of the piezoelectric element defines at least one of walls of each of the pressure chambers.

Piezoelectric type ink-jet printing head having a pressure chamber plate

An ink-jet head includes a holder having first reference surfaces arrayed at a predetermined pitch in a main scanning direction. A plurality of segment chips is held on the holder. Each of the plurality of segment chips has an ink chamber plate and nozzles, each of the ink chamber plates having a flat surface on which grooves forming ink chambers are arrayed in a row perpendicular to the main scanning direction. Each of the ink chamber plates has a second reference surface extending from and coplanar with the flat surface. The second reference surfaces of the ink chamber plates of the plurality of segment chips are in contact with the first reference surfaces of the holder so that the nozzles of the respective segment chips are positioned on the holder at the pitch in the main scanning direction, and the plurality of segment chips are fixed to the holder.

Ink-jet head for providing accurate positioning of nozzles of segment

A piezoelectric fluid pump includes a stationary pump base and a plurality of piezoelectric elements arranged in parallel on the stationary pump base, each of the piezoelectric elements having, in a polarizing direction thereof or in a direction perpendicular to the polarizing direction, a first end fixed to the stationary pump base and a free, second end. The free, second ends of respective pairs of adjacent the piezoelectric elements are connected to each other, for respective units of the fluid pump. Between the pair of piezoelectric elements and between the stationary pump base and the connecting means, pressure chambers are defined. There are gaps are between walls of the piezoelectric elements and walls of piezoelectric elements of adjacent units.

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Inagi, Japan

Akihiko Miyaki