Fujitsu Corporation

Hiroo Ueda

Mitsuo Ozaki

Shigeharu Suzuki

Kohei Kiyota

Hiroshi Sasao

Masahiro Mori

Takefumi Inagaki

Shigeyoshi Umemiya

Shunji Kitagawa

Shino Tokuyo

Shino Sakai

Keita Ohtsuka

Keita Akeno

Koji Uchiyama

Kunihiko Tasai

Color recording liquid which comprises, in combination, (a) an aqueous, black-colored recording liquid and (b) at least one aqueous, colored recording liquid which has other hue than black, in which said liquid (b), when applied to a recording medium, can be fixed in said recording medium within a shorter time than the time required when said liquid (a) is fixed in the same recording medium, and either or both of said liquid (a) and said liquid (b) are a recording liquid which comprises water having dispersed therein a coloring material consisting of particles of colored, ionic group-containing resin. Using the color recording liquid, it becomes possible to obtain high quality black recording without causing blurring of color, along with high quality color recording having no bleeding of color in a borderline between two adjacent color recording areas of different hues.

Color recording liquids, cartridges, recording methods and devices

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

A reusable thermal ink sheet used for thermal printing has a thermal ink composition layer formed on a substrate. The thermal ink composition is a mixture of ink material and filler. The ink material includes a coloring agent and a low temperature melting compound which is a solid at room temperature and is melted during thermal printing in response to a printing image to be transferred. The low temperature melting compound contains a urethane compound as a base material and additive materials as viscosity modulators thereof which lower the viscosity of the ink material at printing temperature. The additive materials contain at least one material selected from the group consisting of fatty acid compounds, fatty acid amide compounds and ester compounds. The improved ink sheet assures a high quality printing image is transferred to a plain paper having a rough surface when thermal printing occurs ten times or more. In addition, ghost images are not formed and background noise is eliminated. Further, a plasticizer is added to the ink material described above, thereby improving the thermal printing ability at a low temperature.

Ink sheet usable in thermal recording

An ink sheet including an ink layer composed of 10 weight part of urethane wax, 1 weight part of ester wax, 5 weight part of paraffin wax, 5 weight part of dyestuff and 2 weight part of carbon black, on a polyester resin film substrate through an adhesive layer composed of 15 weight part of a (vinyl chloride)-(vinyl acetate) copolymerized resin, 15 weight part of carbon black and 48 weight part of polyester mixture composed of two kinds of polyester resin one of which has a glass transition temperature of 67.degree. C. and the other of which has a glass transition temperature of -20.degree. C., mixed in a weight ratio of 75/25.

Thermal imprint ink sheet

Disclosed is a photoconductive recording element having a high photosensitivity over the entire band of visible rays which comprises an electroconductive substrate and a photoconductive layer formed on the substrate. The photoconductive layer comprises an acid dye and a basic dye both of which may be concurrently adsorbed on the outer surfaces of fine zinc oxide particles, or the acid dye of which is adsorbed on the outer surfaces of the zinc oxide particles and the basic dye of which is adsorbed on each layer of the acid dye.

Xanthene type acid dye and a base dye-sensitized zinc oxide

Growing community of inventors

Kawasaki, Japan

Hiroo Ueda