Fujitsu Corporation

Kohei Kiyota

Hiroo Ueda

Akira Nakazawa

Hideki Kamaji

Mitsuo Ozaki

Shunji Kitagawa

Shin Araki

Shigeo Nonoyama

Noboru Takada

Hiroshi Sasao

Koji Uchiyama

Kunihiko Tasai

Hiroshi No

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

Recording apparatus

An electrophotographic multi-layered photosensitive member having a top layer of hydrogenated amorphous silicon carbide and the method for forming the top layer are provided. The hydrogenated amorphous silicon carbide has an atomic ratio of carbon to carbon plus silicon C/(Si+C) ranging from 0.17 to 0.47 and a ratio of the number of hydrogen atoms bonded to a silicon atom per silicon atom, to number of hydrogen atoms bonded to a carbon atom per carbon atom, {(Si--H)/Si}/{(C--H)/C}, ranging from 0.3 to 1.0. The top layer is formed on a photosensitive member of hydrogenated amorphous silicon by employing a glow discharge CVD method. The gaseous mixture composed of disilane (Si.sub.2 H.sub.6) and propane (C.sub.3 H.sub.8) mixed with a mol ratio expressed as C.sub.3 H.sub.8 /(Si.sub.2 H.sub.6 +C.sub.3 H.sub.8) ranging from 0.2 to 0.6 is used. Another gaseous mixture is also used with an improved result. The mixture comprises disilane (Si.sub.2 H.sub.6) gas, propane (C.sub.3 H.sub.8) gas, and hydrogen (H.sub.2) gas, the mixing mol ratio of the propane gas to the disilane gas expressed as C.sub.3 H.sub.8 /(Si.sub.2 H.sub.6 +C.sub.3 H.sub.8) ranging from 02 to 0.7, and the mixing mol ratio of the hydrogen gas to the remaining gas, H.sub.2 /(Si.sub.2 H.sub.6 +C.sub.3 H.sub.8), ranging from 1 to 10.

Electrophotographic multi-layered photosensitive member having a top

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

Machida, Japan

Kohei Kiyota