Ricoh Company, Ltd.

Pfu Limited

Fujitsu Corporation

Olfa Corporation

Minoru Masuda

Yasutada Shitara

Shuichi Morikawa

Koichi Sakata

Hitoshi Iwatsuki

Kimitoshi Yamaguchi

Satoshi Takahashi

Yoshihiro Norikane

Hideki Sugiura

Toyoaki Tano

Satoshi Mochizuki

Hiroshi Yamashita

Yutaka Takahashi

Kazuhiko Umemura

Hiroyuki Kishida

Shinya Nakayama

Mitsuo Aoki

Yasuo Asahina

Hisashi Nakajima

Masashi Nagayama

Hiroshi Yamada

Kousuke Suzuki

Tomomi Suzuki

Atsushi Yamamoto

Shinji Aoki

Yasuaki Iwamoto

Toyoshi Sawada

Ryota Inoue

Takamasa Hase

Yukiko Iwasaki

Hideyuki Santo

Masami Tomita

Tomoyuki Ichikawa

Tsuneyasu Nagatomo

Kazumi Suzuki

Tsuyoshi Sugimoto

Yohichiroh Watanabe

Masahide Yamada

Kazuki Yogosawa

Satoshi Ishida

Yasunori Miyauchi

Masahiko Futatsuka

Kiyotada Katoh

Makoto Takagawa

Hyo Shu

Saori Yamada

Kumi Hasegawa

Tohru Suganuma

Kento Takeuchi

Kaede Masuko

Ryoichi Yasukawa

Tomomi Tamura

Mariko Takii

Yuka Mizoguchi

Kohsuke Suzuki

Masanori Rimoto

Masaru Ohgaki

Keiji Makabe

Kohsuke Nagata

Tomoko Utsumi

Susumu Chiba

Andrew Mwaniki Mulwa

Daichi Hisakuni

Masashi Matsumoto

Yosuke Takashima

Shizuka Hashida

Shigenori Yaguchi

Satoyuki Sekiguchi

Yoshihiro Moriya

Junichi Watanabe

Akinori Saitoh

Takeshi Shibuya

Taichi Nemoto

Suzuka Amemori

Toshiyuki Watanabe

Akira Azami

Bing Shu

Tatsuya Morita

Masaya Takamori

Tatsuru Moritani

Tomomi Harashima

Kenta Kenjoh

Takuya Suganuma

Akio Matsui

Shinsuke Nagai

Ryuta Chiba

Akinori Saito

Namie Suzuki

Hiroyuki Takeda

Noriaki Yamazaki

Akihiro Takeyama

Kenji Yoneda

Hiroshi Shiraiwa

Taro Araki

A carrier for forming an electrophotographic image is provided. The carrier comprises a core particle and a coating layer coating the core particle. The coating layer contains chargeable particles and a dispersant. The carrier has an apparent density of from 2.0 g/cmor greater but less than 2.5 g/cm.

Carrier for forming electrophotographic image, developer for forming electrophotographic image, electrophotographic image forming method, electrophotographic image forming apparatus, and process cartridge

A carrier for forming an electrophotographic image is provided. The carrier comprises a core particle and a coating layer coating the core particle. The coating layer contains a conductive component comprising an element A, and a coating resin comprising an element B. The element A is undetected in the coating resin by an energy dispersive X-ray spectrometer, and the element B is undetected in the conductive component by the energy dispersive X-ray spectrometer. A standard deviation of a value A/B is 0.4 or less, where the value A/B is a ratio of the element A to the element B in intensity measured by the energy dispersive X-ray spectrometer.

Carrier for forming electrophotographic image, developer, image forming method, image forming apparatus, and process cartridge

A carrier is provided that includes a core particle and a coating layer coating the core particle. The coating layer includes a resin and chargeable inorganic fine particles, and has voids. The resin has an average film thickness of 0.10 μm or larger and smaller than 0.45 μm. The coating layer has a porosity of 0.1% or higher and lower than 2.8%, when the porosity expressed by the following equation:Porosity [%]=1/2×100where, on a cross section of the coating layer, S1 represents a cross sectional area of the voids and S2 represents a cross sectional area of the resin.

Carrier, developer, image forming method, and process cartridge

A carrier for developing an electrostatic latent image is provided. The carrier comprises a core particle having an internal void ratio of from 0.0% to 2.0% and a coating layer coating the core particle. The coating layer contains flat chargeable particles satisfying Formula 1 blow:1.0≤R1/R2≤3.0  Formula 1where R1 [nm] and R2 [nm] represent a major axis and a thickness, respectively, of each of the flat chargeable particles. The carrier has an apparent density of from 2.0 to 2.5 g/cm.

Carrier for developing electrostatic latent image, two-component developer, image forming apparatus, process cartridge, and image forming method

A developing apparatus includes an electrostatic latent image bearer, a developing sleeve, a case, and an air filter. The case accommodates a two-component developer and the developing sleeve. The air filter is attached to the case. The air filter has a thickness of 2 to 20 mm and has a density gradient with a pressure loss of 2 to 40 Pa at a wind speed of 10 cm/s. The air filter forms an airflow sucked into the case from a gap between the developing sleeve and the case and forms an airflow discharged from the case through the air filter. The two-component developer accommodated in the case contains a magnetic particle a surface of which is coated with a resin layer. The resin layer contains at least one type of chargeable particle.

Developing apparatus, developer for electrophotographic image formation, electrophotographic image forming method, and electrophotographic image forming apparatus

A toner for electrostatic charge image development, wherein a spin-spin relaxation time of the toner at 90&#xb0; C. is 0.30 msec or more but 1.50 msec or less, and a spin-spin relaxation time of the toner at 50&#xb0; C. is 0.0185 msec or more but 0.0300 msec or less, the spin-spin relaxation time of the toner at 90&#xb0; C. and the spin-spin relaxation time of the toner at 50&#xb0; C. being obtained by Hahn echo method of pulse NMR analysis.

Toner for electrostatic charge image development, toner stored unit, image forming apparatus, and image forming method

An image forming method is provided. The image forming method includes: forming an electrostatic latent image on an electrostatic latent image bearer; developing the electrostatic latent image on the electrostatic latent image bearer with a toner to form a toner image; transferring the toner image from the electrostatic latent image bearer onto a continuous resin film; fixing the toner image on the continuous resin film with a heat roller or a heat belt. The toner contains a maleic-acid-modified polyolefin having a polypropylene block in a main chain.

Image forming method and image forming apparatus

A toner including: a plate-shaped pigment containing a metal as a main component; and a binder resin containing polyester resin (A) that is insoluble in THF, wherein: a weight average molecular weight (Mw) of a tetrahydrofuran (THF)-soluble component of the toner as determined by gel permeation chromatography (GPC) is 5,000 or higher but 14,000 or lower; and a glass transition temperature (Tg) of a THF-insoluble component of the toner as determined from a differential scanning colorimetry (DSC) curve at first heating in DSC is &#x2212;60&#xb0; C. or higher but 10&#xb0; C. or lower.

Toner, toner stored unit, and image forming apparatus

An image forming apparatus is provided that includes: first and second electrostatic latent image bearers; first and second electrostatic latent image forming devices; first and second developing devices configured to develop first and second electrostatic latent images with a colored toner and a special-color toner to form a colored toner image and a special-color toner image, respectively; a primary transfer device configured to transfer the colored toner image and the special-color toner image onto an intermediate image bearer in an overlapping manner to form a composite toner image; a secondary transfer device configured to transfer the composite toner image onto a recording medium; and a fixing device configured to fix the composite toner image thereon. The special-color toner comprises plate-like and/or film-like pigments. An absolute difference in volume resistivity between the special-color toner and the colored toner is 0.30 log &#x3a9; cm or less.

Image forming apparatus and toner set

A toner is provided that contains a crystalline polyester resin comprising a polycondensed resin of a dicarboxylic acid represented by the following formula (1) with a diol represented by the following formula (2). A content of a cyclic ester represented by the following formula (3) in the toner, measured by a thermal extraction gas chromatographic mass spectrometry at a thermal extraction temperature of 160&#xb0; C., is from 1 to 200 ppm in terms of toluene: where n represents an integer of from 2 to 12; where m represents an integer of from 2 to 12; and where n represents an integer of from 2 to 12, m represents an integer of from 2 to 12, and m+n&#x2265;6 is satisfied.

Toner, toner storage unit, image forming apparatus, and method for manufacturing toner

Cutter knife

The present invention provides a cutter knife, which even if made with only the metal parts, smoothness of sliding operation of the blade is not degraded in time, even without lubricating oil nor friction resistant coating, A slider of the cutter knife carries rolling member, which is made rolling contact with the outer surface of the cutter knife. Further, the slider has a protrusion which extends into the cutter knife body and is engaged into a hole formed on the blade. Since an external force applied onto the slider is received by the rolling member, the slider can be operated smoothly. Besides, the height of the protrusion is determined, such that the protrusion does not touch the inner surface of the cutter knife. Thus, the protrusion tip never interfere with the inner surface of the cutter knife, thereby the sliding operation of the slider would not be prevented.

Full metal cutter knife

A cleaner, such as provided in a particulate material production apparatus, for cleaning a droplet ejector, which includes nozzles to eject a particulate material composition liquid as droplets, and a nozzle plate bearing the nozzles. A substantially closed cleaning space is formed outside the nozzles and the nozzle plate, and a first cleaning liquid supplying device supplies a first cleaning liquid to the cleaning space so that the nozzles and the nozzle plate are contacted with the first cleaning liquid. In addition, a vibrator vibrates the first cleaning liquid when the nozzles and the nozzle plate are contacted with the first cleaning liquid to clean the nozzles and the nozzle plate.

Cleaner for cleaning droplet ejector, and particulate material production apparatus using the cleaner

A toner includes a binder resin. Particles of a metal complex or a salt of an aromatic carboxylic acid derivative having a number-average particle diameter of from 0.2 &#x3bc;m to 1.0 &#x3bc;m are present on the surface of the toner. A coverage of the particles of a metal complex or a salt of an aromatic carboxylic acid derivative over the surface of the toner is from 10% to 50%.

Toner, toner housing unit, image forming apparatus, and image forming method

A toner fixable on an image bearer with heat. The toner has a first storage modulus of from 1&#xd7;10to 1&#xd7;10Pa, measured at 100&#xb0; C. when being heated, and a second storage modulus of from 1&#xd7;10to 1&#xd7;10Pa, measured at 100&#xb0; C. when being cooled, the first storage modulus and second storage modulus being measured by a rheometer, and the second storage modulus at 100&#xb0; C. when being cooled is higher than the first storage modulus at 100&#xb0; C. when being heated.

Toner, developer, image forming apparatus and toner housing unit

Growing community of inventors

Shizuoka, Japan

Minoru Masuda