Fujitsu Corporation

Fujitsu Isotec Limited

Takumi Kawamura

Masahiro Ono

Akihiko Miyaki

Akira Iwaishi

Yukio Saito

Masaki Okuyama

Masayuki Sasaki

Hiromitsu Soneda

Shigeo Nonoyama

Mutsuo Watanabe

Yoshiki Nagasaki

Tomoyuki Nagamine

Norihiro Yoshida

Shigeru Akema

Tsutomu Munekata

Akio Yano

Tomoyuki Akahoshi

Koichi Sanpei

Tomohisa Mikami

Kouichi Sanpei

An ink-jet head includes a head portion having a plurality of head segments and an ink feeding portion, where ink is supplied such that pipes each have one end connected to the head portion and the other end connected to one of ink feeding paths of the ink feeding portion. The pipes are held by elastic ring-shaped members that are further sidewise held by rigid ring-shaped members and vertically sandwiched between the ink feeding paths and an upper end portion of the head portion.

Ink-jet head and printer using the same

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

An ink cartridge connectable to a print head having a supply pipe which receives a supply of ink includes a casing having a first, upper chamber and a second, lower chamber communicating with each other via a communicating hole and storing the ink, a porous body provided in the first chamber and storing the ink by a negative pressure, and a connection part provided in the second chamber and connectable to the supply pipe. The connection part has normally closed valve means for communicating the print head with the second chamber by opening when the supply pipe is inserted into the connection part. The ink cartridge includes a connecting pipe extending from the first chamber into the second chamber and a filter member covering the opening of the connecting pipe in the second chamber. The filter member releases air from the connecting pipe upwardly into an upper region of the second chamber.

Ink cartridge with residual ink retaining structure

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 backup unit is provided with respect to a nozzle of a print head for printing by injecting ink, and sucks the ink from the nozzle, the backup unit including: a nozzle cap sealing the nozzle by making contiguous contact with the print head; a pump; and an ink path communicating the nozzle cap and the pump; wherein the pump includes: a bellows part having an internal space formed therein; a movable rod fixed to the bellows part and having an ink passage therein; a slide valve provided in the bellows part and slidable with respect to the rod, the slide valve closing and opening a hole provided at one end of the ink passage with respect to the internal space, depending on a position of the movable rod; an ink inlet provided at the other end of the ink passage and communicating with the ink path; and an ink outlet communicating with the internal space depending on a position of the slide valve, the slide valve having a stroke shorter than a stroke of the rod, a volume of the internal space within the bellows part increasing and decreasing as the slide valve makes a reciprocating motion in a direction parallel to a center axis of the rod, the slide valve sucking the ink from the nozzle via the ink inlet by opening the hole of the ink passage to the internal space when the rod is at a position where the volume of the internal space is a maximum, and discharging the ink in the internal space via the ink outlet as the volume of the internal space decreases.

Ink jet printer having backup unit with any one or both of a pump

A paper feeder is arranged so that a hand-carry type portable printer per se is mounted thereon, and a magnetic repulsion and/or a mechanical engagement are utilized to properly orientate and position the printer with respect to the base frame, when mounting the printer on the base frame.

Paper feeder for portable printer

A retaining device for an electronic apparatus comprising a plurality of cases respectively containing individual component mechanisms of a small electronic apparatus, a magnet disposed in a recess formed in a surface of a first case among the plurality of cases; and a magnetic member provided on a second case among the plurality of cases. In this device, the magnet attracts the magnetic member to fix the respective positions of the first case and the second case relative to each other when the first case and the second case are set contiguously with the magnet and the magnetic member disposed opposite to each other.

Magnetic retaining device for electronic apparatus

A retaining device for an electronic apparatus comprising a plurality of cases respectively containing individual component mechanisms of a small electronic apparatus, a magnet disposed in a recess formed in a surface of a first case among the plurality of cases and a magnetic member provided on a second case among the plurality of cases. In this device, the magnet (60) attracts the magnetic member to fix the respective positions of the first case and the second case relative to each other when the first case and the second case are set contiguously with the magnet and the magnetic member disposed opposite to each other.

Growing community of inventors

Kawasaki, Japan

Takumi Kawamura