Ricoh Company, Ltd.

Other

Mitsui Petrochemical Industries, Ltd.

Tokyo Institute of Technology

Shinichi Kuramoto

Kazuo Tsubuko

Sadao Takahashi

Kazuhiko Umemura

Yoshiyuki Kimura

Kiyoshi Tanikawa

Yoshiaki Miyashita

Kazuhiro Ando

Youichi Asaba

Hiroshi Yamashita

Mitsuo Aoki

Tadashi Saitoh

Satoshi Shinguryo

Hidemi Uematsu

Osamu Uchinokura

Yoshimichi Katagiri

Kumi Hasegawa

Masakazu Kinoshita

Masae Nakamura

Shohichi Sugimoto

Hajime Takanashi

Masami Tomita

Takashi Yoshida

Toyoshi Sawada

Yasuo Asahina

Masashi Nagayama

Tomomi Suzuki

Tomio Kondou

Keiko Shiraishi

Shinji Ohtani

Tadashi Saito

Bing Shu

Motoi Orihara

Toshihiko Takahashi

Nobutaka Kinoshita

Hachiroh Tosaka

Yoshihiro Sugiyama

Akira Oyamaguchi

Tomoe Hagiwara

Makoto Okawara

Yoshihisa Okamoto

Hidefumi Gohhara

Kayoko Nagai

Chiharu Mochizuki

Michio Izumi

Yoshimi Mizoguchi

Hiroshi Sugimoto

Takashi Okada

Koji Suzuki

Chiaki Tanaka

Hiroaki Matsuda

Yasuhiro Takahashi

Kiyoshi Sakai

Takashi Yamamoto

Masahide Yamashita

Tsuneo Kurotori

Hideki Sugiura

Yoshihiro Norikane

Ryota Inoue

Fumihiro Sasaki

Toshiki Nanya

Hiroyuki Fushimi

Manabu Mochizuki

Koichi Kato

Naoki Iwata

Kenzo Ariyama

Shigekazu Enoki

Kimiharu Yamazaki

Kazuhito Watanabe

Eiichi Kawamura

Hiromitsu Kawase

Takamichi Enomoto

Masato Igarashi

Kaori Hemmi

Hachiro Tosaka

Kohsuke Suzuki

Masatoshi Saitoh

Hideo Nakamura

Yoichiro Watanabe

Masanaga Imamura

Junichiro Hashimoto

Shunsuke Kawasaki

Mitsuru Ohminato

Kohichi Katoh

Masakazu Yashiro

Kazuyoshi Fushinobu

Toshiyuki Fukase

Makoto Ohkawara

Okawara, Makoto

Tsubuko Kazuo

Satoshi Shinguryou

Masaru Wakisaka

Satoshi Singuryo

Masaru Nakano

Kouchi Ohshima

Junji Toda

Katsumi Kuboshima

Yoshio Sato

Yoshio Kudo

Takashi Ishizuka

An image forming apparatus includes a plurality of temperature-influence members, a first-point temperature acquisition unit, a second-point temperature estimation unit, and a controller. The plurality of temperature-influence members have influence on a temperature of a recording medium on which an image is formed. The first-point temperature acquisition unit is configured to detect or estimate a temperature of the recording medium at a first point. The second-point temperature estimation unit is configured to estimate a temperature of the recording medium at a second point, based on a detection result of at least one of a temperature of the recording medium at a point different from the second point and a temperature of a member or atmosphere. The controller is configured to control the plurality of temperature-influence members, based on an acquisition result from the first-point temperature acquisition unit and an estimation result from the second-point temperature estimation unit.

Image forming apparatus

To provide (1) a method for manufacturing a carrier, including: dissolving a coating material composed of a plurality of types of materials in a fluid containing at least one of a supercritical fluid and a subcritical fluid; and lowering the solubility of the solution by controlling at least one of pressure and temperature to form a coating layer on a core surface, or (2) a method for manufacturing a carrier, including: dispersing or dissolving a coating material in a fluid containing at least one of a supercritical fluid and a subcritical fluid; and lowering solubility of the solution by controlling at least one of pressure and temperature to form a coating layer on a core surface, wherein the coating material contains at least a silicone resin, and the silicone resin has a weight-average molecular weight (Mw) of 800 to 5,000.

Carrier and manufacturing method thereof, developer, process cartridge, image forming apparatus, and image forming method

To provide a toner for developing an electrostatic charge image, the toner containing at least a colorant obtained by reacting a polymer with a basic dye, wherein the polymer contains 10 mol % or more of a monomer unit having any one of a sulfonic acid group, a sulfonic acid salt group, a sulfuric acid group and a sulfuric acid salt group as a constitutional unit, and the toner is obtained by forming a toner composition liquid containing at least the colorant into oil droplets in an aqueous medium, and solidifying the oil droplets into solid particles.

Toner for developing electrostatic charge image, image forming method and image forming apparatus

There is provided a toner for developing a latent electrostatic image, obtained by a method containing: ejecting a toner composition fluid from an ejection hole so as to make the toner composition fluid into droplets; and solidifying the droplets in an atomizing space so as to form solid particles, wherein the toner composition fluid contains at least a colorant formed by reacting a polymer containing 10 mol % or more of a monomer unit having a sulfonic acid group or a salt thereof, or a monomer unit having a sulfuric acid group or a salt thereof as a constitutional unit, and a basic dye.

Toner for developing latent electrostatic image, method for producing the same and apparatus for producing the same, and developer, toner container, process cartridge, image forming method and image forming apparatus

A method for forming a full color image including: forming at least yellow, magenta and cyan color toner images on a receiving material to form a full color image thereon; and fixing the full color image upon application of heat thereto while not contacting the full color image, wherein each of the yellow, magenta and cyan color toner images includes a binder resin and a pigment, wherein the yellow color toner includes a benzimidazolone pigment, the magenta color toner includes at least one of Naphthol Carmine F6B and a combination of Naphthol Carmine F6B and Naphthol Carmine FBB, and the cyan color toner includes &#x3b2; copper phthalocyanine, and wherein the yellow color toner image has a position closer to the receiving material than any other color toner image when two or more of the color toner images including the yellow color toner image are overlaid.

Color toners and image forming method using the color toners

A toner for electrophotography contains a binder resin, a charge control agent, and a colorant. The colorant is a black iron oxide compound containing 10 to 45% by weight of titanium component calculated in terms of Ti atom in relation to Fe atom when measured by wavelength dispersive X-ray fluorescence spectrometry. Peaks at Bragg angle 2&#x3b8; of the toner to CuK&#x3b1; X-ray are peak A at 32.9 degrees &#xb1;0.3 degrees and peak B at 35.5 degrees &#xb1;0.3 degrees, and X ray intensity ratio between peaks A and B (A/B) is in the range of 0.3 to 2.0 at a scan speed of 0.5 to 4 degrees/min.

Toner for electrophotography, and image fixing process, image forming process, image forming apparatus and process cartridge using the same

A toner including a binder resin including a crystalline polyester and a non-crystalline resin; a release agent; and a black metal-containing material having a saturation magnetization not greater than 50 emu/g. A toner container containing the toner. A fixing method including passing a support with the toner image thereon through a nip between two cylindrical rollers while applying a pressure not greater than 1&#xd7;10Pa to the two cylindrical rollers, wherein one of the cylindrical rollers which contacts the toner image has a thickness not greater than 1.0 mm. An image forming method including developing an electrostatic image with the toner to form a toner image; transferring the toner image onto a receiving material; and fixing the toner image by the fixing method mentioned above. A process cartridge including an image bearing member and a developing device using the toner.

Toner for forming image, method for developing electrostatic latent image, method for fixing toner image, image forming method and process cartridge using the toner

An image formation method for forming an image is proposed, which uses an image formation apparatus capable of performing (1) multi-color image formation and printing by superimposing toner images with different colors by use of a plurality of color toners with different colors, including at least a black toner, and (2) monochrome image formation and printing, using only a black toner, with a maximum transferable amount of each color toner onto the image being in a range of 4&times;10 kg/m to 8&times;10 kg/m , wherein an image glossiness (GKC) obtained by the black toner in the maximum transferable amount thereof at the multi-color image printing, an image glossiness (GCC) obtained by each of the color toners other than the black toner in the maximum transferable amount thereof at the multi-color image printing, and an image glossiness (GKM) obtained by the black toner in the maximum transferable amount thereof at the monochrome image printing satisfy a particular relationship as described in the specification. In addition, the above toners and a printed matter prepared by this image formation method are proposed.

Image formation method, electrophotographic toners, and printed matter

An image formation process which forms a toner image by the nonmagnetic one-component developing system by bringing an electrically conducting brush impressed with a voltage into contact with a photosensitive material to effect the uniform charging, and forming an electrostatic latent image on the photosensitive material by the exposure to the image-bearing light, wherein the toner that is used as a circularity of from 0.92 to 0.98. The nonmagnetic one-component developing system minimizes irregular electric charging that stems from the use of the electrically conducting brush. This action is obtained even in full-color developing system which effects development many times.

Image formation process and developer used therein

A toner including a resin and a colorant which is dispersed in the toner and which has an average major particle diameter not greater than about 0.5 &mgr;m, wherein the following relationships are satisfied: Ta&lE;100 (&deg; C.), and (Tb&minus;Ta)&gE;7.0 (&deg; C.), wherein Ta represents a temperature at which the toner has a melt viscosity of 50,000 Pa&middot;sec and Tb represents a temperature at which the toner has a melt viscosity of 5,000 Pa&middot;sec.

Electrophotographic toner, and image forming method and apparatus using the toner

An image formation method for forming a full-color image includes the step of superimposing four yellow, magenta, cyan and black toner images which are respectively obtained by developing four latent electrostatic images, which respectively correspond to the four yellow, magenta, cyan and black toner images, with a yellow toner, a magenta toner, a cyan toner and a black toner, wherein a gradient a,of a yellow glossiness per unit amount of the yellow toner (mg/cm,) deposited on a transfer sheet, a gradient a,of a magenta glossiness per unit amount of the magenta toner (mg/cm,) deposited on the transfer sheet, and a gradient a,of a cyan glossiness per unit amount of the cyan toner (mg/cm,) deposited on the transfer sheet are in a range of 0.8 a to 1.2 a, and a gradient a,of a black glossiness per unit amount of the black toner (mg/cm,) deposited on the transfer sheet is in a range of 0.4 a to 0.7 a, in which a&equals;(a,&plus;a,&plus;a,)/3.

Full-color electrophotographic image formation method, color toners for use in the same, and color image formed by use of the color toners

An electrophotographic toner including a colorant and a binder resin including at least a styrene resin, wherein the toner further includes one or more styrene oligomers in an amount not greater than 100 ppm. An electrophotographic image forming method is also disclosed in which an electrostatic latent image formed on an image bearing member is developed with the toner.

Electrophotographic toner and image forming method using the toner

A method of forming images on an image receiving material including a non-contact thermal fusing image fixing step employs a black toner made of black toner particles, a yellow toner made of yellow toner particles, a magenta toner made of magenta toner particles and a cyan toner made of cyan toner particles, the black toner particles having a greater volume mean diameter than the volume mean diameter of the toner particles of any of the yellow toner, the magenta toner and the cyan toner.

Image formation method using color toners

Growing community of inventors

Numazu, Japan

Shinichi Kuramoto