Fujitsu Corporation

Shino Sakai

Shigeyoshi Umemiya

Mitsuo Ozaki

Shigeharu Suzuki

Akihiko Ishii

Keita Akeno

Yasuo Yamagishi

Masahiro Mori

Shuji Koike

Takefumi Inagaki

Hiroshi Nou

Masahiro Wanou

Hideki Kamaji

Masae Ikeda

Hiroo Ueda

Nobuo Suematsu

Masashi Ogasawara

An ink jet recording method records an image on a recording medium by adhering inks of a plurality of hues on the recording medium. The ink jet recording method includes the steps of (a) carrying out a recording using two kinds of inks having different diffusibilities with respect to the recording medium for at least a predetermined one of the hues, where a first ink out of the two kinds of inks has a diffusibility which is lower than a diffusibility of an ink having a hue other than the predetermined hue, and (b) at a boundary portion on the recording medium where a first recording region which includes the predetermined hue and a second recording region which includes a hue different from the predetermined hue are adjacent to each other, recording at least a portion of the boundary region with a predetermined recording width up to the second recording region using a second ink out of the two kinds of inks having a diffusibility higher than that of the first ink and recording a remaining portion of the boundary region using the second ink.

Ink jet recording method and apparatus, ink and ink cartridge

Disclosed are a method of and an apparatus for cleaning a plurality of nozzles of an ink jet head. This cleaning method comprises a step of covering a nozzle surface formed with the plurality of nozzles with a cap; a step of depressurizing an air space formed between the nozzle surface and the cap by use of a depressurizing element to suck the inks from the nozzles; a step of stopping the depressurization by the depressurizing element; a step of keeping the nozzle surface covered with the cap so that the inks jetted from the nozzles due to the depressurization wet-spread over the entire nozzle surface by a capillary force; and a step of retracting the cap from the nozzle surface. Further, in this cleaning apparatus, a contact angle .theta.1 between the ink and the cap internal surface and a contact angle .theta.2 between the ink and the nozzle surface are set to 90.degree. or smaller and also set such that .theta.2 is not greater than .theta.1.

Method of and apparatus for cleaning ink jet head

A toner image transferring device has a roller formed of a conductive rubber foam material having a resistivity of more than 10.sup.7 .OMEGA.cm. In a toner image transferring process, a constant current is applied to the roller, whereby a charged toner image can be transferred to a sheet or paper at a desired toner transfer efficiency regardless of a size of the paper or sheet. To remove a toner pollution of the roller, a constant voltage having a polarity opposite to that of the charged toner is applied to the roller. The roller is constituted such that pore openings appear over a surface of the roller, whereby a residual part of a toner polluting the roller will not leave a stain on a rear surface of the sheet or paper.

Conductive roller transfer device with improved transfer efficiency and

A color picture image formation device includes a plurality of photosensitive body drums and a plurality of image formation sections each consisting of a charge unit, an exposure unit and a plurality of developing units for developing toner picture images of various colors and an intermediate transfer body for holding the toner powder images of required number of colors, which transfers the toner picture images to the recording paper and fixes them thereon by a fixing unit after all the toner picture images have been formed on the intermediate transfer body. A transfer voltage is applied by the intermediate transfer body for every developing unit. The intermediate transfer body is a drum formed as a multiple layer structure including a metallic tube, an insulation layer, a metallic conductive electrode which is split into a plurality of sections, and a voltage application layer on the surface of the metallic tube. A transfer roller transfers the toner-picture images onto the recording paper. A voltage application brush which comes into contact with the sections of the metallic conductive electrode applies voltage to the intermediate transfer body.

Color picture image formation device for developing latent image formed

Growing community of inventors

Kawasaki, Japan

Shino Sakai