Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Fuji Xerox Corporation

Hirokazu Hamano

Tetsuya Taguchi

Norihito Fukushima

Katsumi Daimon

Takashi Imai

Masanobu Ninomiya

Manabu Serizawa

Yuka Ishihara

Yasuhiro Oya

Susumu Yoshino

Yutaka Sugizaki

Haruhide Ishida

Kenji Yao

Takahiro Ishizuka

Hideaki Yoshikawa

Masahiro Takagi

Yuko Iwadate

Kazuaki Iikura

Yoshifumi Ozaki

Akihiko Noda

Masaki Nakamura

Masahiro Oki

Yosuke Ninomiya

Takafumi Wakai

Yasuyuki Tsutsumi

Masaru Sakuma

Shinji Mitsui

Kazusei Yoshida

Munenobu Okubo

Ayu Naito

Hiroshi Nakazawa

Koutarou Yoshihara

Eiji Kawakami

Kaori Oishi

Hiroyuki Tanaka

Takeshi Iwanaga

Shintaro Anno

Masaru Takahashi

Hideo Maehata

Hiroshi Kamada

Noriyuki Mizutani

Masanori Ichimura

Moegi Iguchi

Asafumi Fujita

Hidekazu Yaguchi

Satomi Kashiwagi

Soichiro Kitagawa

Jun Igarashi

Toshimizu Ozawa

Shota Matoba

Satoshi Inoue

Akira Matsumoto

Atsushi Sugawara

Chiaki Suzuki

Yutaka Saito

Yosuke Tsurumi

Tsuyoshi Murakami

Michio Take

Eisuke Iwazaki

Masahiro Uchida

Kiyohiro Yamanaka

Shinpei Takagi

Atsuhiko Eguchi

Kaori Ohishi

Sueko Sakai

Yasuhiro Arima

Yoshinari Ueno

Yuusaku Shibuya

Etsuo Tominaga

Hiroki Ohmori

Tomohiro Takeda

Masahiro Andoh

Hisashi Murase

Yusaku Shibuya

Hirokazu Yamada

Toyohumi Inoue

Kouzou Ota

A cellulosic particle contains cellulose as its base constituent, and the intensity of sodium fluorescent x-rays from the cellulosic particle measured by x-ray fluorescence analysis is 0.015 kps or more and 0.1 kps or less.

Cellulosic particle

A cellulosic particle contains cellulose as its base constituent, and the percentage water absorption of the cellulosic particle measured by method B in ISO 15512:1999 is 11% or more and 20% or less.

A cellulosic particle contains 90 parts by mass or more and 99.5 parts by mass or less of cellulose; and 0.5 parts by mass or more and 10 parts by mass or less of a cellulose derivative.

A cellulosic particle includes: a cellulose-based core particle; a first coating layer covering the core particle and containing a polyamine compound; and a second coating layer covering the first coating layer and containing at least one selected from the group consisting of a wax, a linear-chain saturated fatty acid, a hydroxy fatty acid, and an amino acid compound.

There is provided a developing device including a toner holding member that is rotatably provided to face an image holding member and holds and transports a nonmagnetic single-component toner toward a development region to develop an electrostatic latent image on the image holding member, a supplying member that is rotatably provided in elastic contact with the toner holding member to supply the toner from a contact region therebetween to the toner holding member, a toner replenishing unit that faces a replenishment region at a portion apart from the contact region to replenish a new toner, and a regulating member that is provided on a downstream side of the contact region in a rotation direction thereof and on an upstream side of the development region to triboelectrically charge the toner held on the toner holding member and regulate the amount of toner provided for the development.

Developing device, and image forming apparatus using the same

A developing device includes a toner holding member that is rotatably installed opposite to an image holding member which holds a latent image and circularly moves, a supply member that has a rough surface capable of capturing toner, a toner supply portion that supplies new toner, and a restriction member that restricts an amount of toner used for development, wherein the toner supply portion connects an accommodation chamber to a developing chamber via a toner transport path, wherein a developing chamber side opening is located on a lower side of an accommodation chamber side opening of the toner transport path, and wherein a width size in a direction following a rotation direction of the supply member in the developing chamber side opening of the toner transport path is set to be smaller than an outer diameter of the supply member in a projection plane viewed from the supply member side.

A developing device includes a transporting unit that rotates while facing an image carrier that carries an electrostatic latent image, the transporting unit transporting developer toward the image carrier; a feeding unit that contacts the transporting unit to feed the developer to the transporting unit; a transport path that connects a containing chamber that contains the developer to a feeding chamber that houses the feeding unit; a supplying unit that retains the developer to be supplied in the transport path and supplies the developer to the feeding unit in a supply region that is separated from a contact region in which the feeding unit contacts the transporting unit; and an attaching unit that is disposed downstream of the contact region and upstream of the supply region in a rotation direction of the feeding unit and that attaches the developer to the feeding unit at a location below the contact region.

Developing device having an attaching unit for attaching developer and image forming apparatus including the same

A developing device including a toner holding member that faces but is not in contact with an image carrier carrying a latent image and that rotates while holding a nonmagnetic toner, a charging member that charges the toner, and a developing electric field forming unit that forms a developing electric field at least including a direct current component to cause the charged toner to fly and adhere to the latent image to develop the latent image. When the developing electric field is applied such that the toner is caused to fly toward the image carrier by the direct current component of the developing electric field, maintaining a non-electrostatic adhesion of the toner to the toner holding member to be about 2 nN or more under a low-temperature low-humidity environment of a temperature of 10&#xb0; C. and a relative humidity of 15%. The toner holding member's surface has a specific surface roughness specified by a specific oil retention volume.

Image forming apparatus including developing device using toner holding member with specific surface roughness

An electrostatic charge image developing toner includes toner particles that contain a colorant, a binder resin and a release agent, and an external additive, in which the external additive contains inorganic particles including an aliphatic alcohol having 5 or more carbon atoms and a melting point of 20&#xb0; C. or lower on the surfaces thereof.

Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, developer cartridge, process cartridge, image forming apparatus, and image forming method

An electrostatic charge image developing toner includes toner particles, and an external additive containing titanate compound particles having an iron content of from greater than 1200 ppm to 6000 ppm.

Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus

An electrostatic charge image developing toner includes toner particles containing a colorant, a binder resin, and a release agent, and an external additive, wherein the external additive includes particles having oil-treated surfaces and composite particles containing silica and titania, and the toner has a content ratio of titania with respect to silica on the surface of the toner, as measured by X-ray photoelectron spectroscopy, of equal to or less than 5 atomic %.

Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, developer cartridge, process cartridge, image forming method, and image forming apparatus

An electrostatic charge image developing toner includes toner particles containing a colorant, a binder resin, and a release agent; and an external additive, wherein the external additive contains inorganic particles which include a compound represented by Formula (1) below on the surfaces thereof: wherein in Formula (1), Rand Reach independently represents an alkyl group, Rto Reach independently represents an alkyl group or a substituted or unsubstituted phenyl group, and at least three groups of Rto Reach independently represents a substituted or unsubstituted phenyl group.

A toner for developing an electrostatic image, includes: colored particles containing a colorant and a binder resin, and two or more kinds of inorganic particles that are externally added to a surface of the colored particles, in which the two or more kinds of inorganic particles contain titanium-containing particles and silica-containing particles, an exposure ratio of the surface of the colored particles is about 25% or less, and a ratio of the titanium-containing particles that are in contact with the colored particles is about 15% by number or less.

Toner for developing electrostatic image, method of producing toner, cartridge, image forming method, and image forming apparatus

A toner for developing an electrostatic image, includes: colored particles containing a colorant and a binder resin, and two or more kinds of inorganic particles that are externally added to a surface of the colored particles, in which the two or more kinds of inorganic particles contain titanium-containing particles and silica-containing particles, an exposure ratio of the surface of the colored particles is about 25% or less, and a ratio of the silica-containing particles that are in contact with the colored particles is about 10% by number or less.

A developer for electrostatic photography, includes: a toner containing toner particles containing a colorant and a binder resin, and an external additive having a number average particle diameter of about 100 nm or more and about 800 nm or less; and rugged particles having a rate of ruggedness represented by formula (1) of about 30% or more and about 70% or less:Rate of Ruggedness=100&#x2212;(Projected area/Envelope area)&#xd7;100&#x2003;&#x2003;(1).

Developer for electrostatic photography, process cartridge for image forming apparatus, image forming apparatus, and image forming method

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Kanagawa, Japan

Hirokazu Hamano