Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Kenta Ide

Shigeto Hashiba

Kazuhiro Koseki

Hirofumi Nakamura

Satoya Sugiura

Masahiro Iwasaki

Kosuke Narita

Akihiro Kawasaki

Takahiro Suzuki

Fuyuki Kano

Keisuke Kusano

Koji Bando

Akihiro Nonaka

Yoichi Kigoshi

Yuki Oyamada

Katsumi Nukada

Takashi Imai

Wataru Yamada

Takeshi Iwanaga

Tomoya Sasaki

Masaki Hirakata

Hidemi Nukada

Kazuyuki Nakamura

Kazuya Hongo

Nobuyuki Torigoe

Hideya Katsuhara

Hitoshi Takimoto

Mitsuhide Nakamura

Kaori Iemura

Toru Asahi

Kaori Iemula

Yasuhiro Nida

An image forming apparatus includes an electrophotographic photoreceptor that includes a conductive substrate, an undercoat layer provided on the conductive substrate, containing a binder resin and an electron transport material, and satisfying Expression 1-1, and a photosensitive layer provided on the undercoat layer, a charging device that charges a surface of the electrophotographic photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the electrophotographic photoreceptor, a developing device that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a developer containing a toner to form a toner image, and a transfer device that transfers the toner image to a surface of a recording medium, in which a moving time of an outer peripheral surface of the electrophotographic photoreceptor, required from charging performed by the charging device to development performed by the developing device, is 90 msec or longer,

Image forming apparatus

An image forming apparatus includes an electrophotographic photoreceptor that has an outermost surface layer containing fluorine-containing resin particles, a charge transport material, and a binder resin, in which the number of carboxy groups contained in the fluorine-containing resin particles is 0 or greater and 30 or less per 10carbon atoms, and the outermost surface layer has a tan δ of 0.025 or greater and 0.030 or less, a charging device that comes into direct contact with the electrophotographic photoreceptor and applies only a DC voltage to charge the electrophotographic photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on a surface of the charged electrophotographic photoreceptor, a developing device that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a developer containing a toner to form a toner image, a transfer device that transfers the toner image by bringing the electrophotographic photoreceptor and a medium to be transferred into direct contact with each other, and a cleaning device that cleans the surface of the electrophotographic photoreceptor.

Image forming apparatus including an electrophotographic photoreceptor

An electrophotographic photoreceptor includes a conductive substrate; an organic photosensitive layer that is provided on the conductive substrate; and an inorganic protective layer that is provided on the organic photosensitive layer so as to be in contact with a surface of the organic photosensitive layer, wherein the organic photosensitive layer includes at least a charge transport material and silica particles in a region on the surface side in contact with the inorganic protective layer.

Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor includes a conductive support, an undercoat layer that is provided on the conductive support and that has a thickness of from 15 &#x3bc;m to 40 &#x3bc;m and has light transmittance of 20% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 &#x3bc;m, a charge generation layer that is provided on the undercoat layer, and a charge transport layer that is provided on the charge generation layer and that has a thickness of from 15 &#x3bc;m to 40 &#x3bc;m and has light transmittance of 30% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 &#x3bc;m.

An image forming apparatus includes at least an electrophotographic photoreceptor having at least a conductive support, an undercoat layer, and a photosensitive layer; a charging device that charges the surface of the electrophotographic photoreceptor in a contact charging mode, in which only DC voltage is applied; an electrostatic latent image forming device that exposes the surface of the charged electrophotographic photoreceptor to form an electrostatic latent image; a developing device that develops the electrostatic latent image by a developer to form a toner image; and a transfer device that directly transfers the toner image from the electrophotographic photoreceptor to a transfer medium; and does not include an erasing device for erasing the surface of the electrophotographic photoreceptor after the toner image is transferred onto the transfer medium by the transfer device and before the surface of the electrophotographic photoreceptor is charged by the charging device.

Image forming apparatus and process cartridge

An electrophotographic photoreceptor includes a conductive support, and an undercoat layer, a charge generation layer, and a charge transport layer that are provided in this order on the conductive support, wherein the undercoat layer includes at least metallic oxide particles, a reactive acceptor substance including an anthraquinone structure expressed by the following Formula 1, and a binder resin, the charge generation layer includes hydroxygallium phthalocyanine as a charge generation material, and a reflectance of incident light having a wavelength of 780 nm on a surface of the charge generation layer when the charge transport layer is removed is 17% or greater: wherein the anthraquinone structure expressed by Formula 1 is bonded to another structure at a position of *, and thus forms the reactive acceptor substance, and in Formula 1, n1 represents an integer of 1 to 7.

An electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on a surface of the conductive substrate, an outermost layer of the photosensitive layer containing a crosslinked product formed from at least one charge transporting material having at least one substituent selected from the group consisting of &#x2014;OH, &#x2014;OCH, &#x2014;NH, &#x2014;SH, and &#x2014;COOH and at least one selected from a guanamine compound or a melamine compound, the content of the at least one charge transporting material being at least about 90% by weight, and the content of the at least one selected from the guanamine compound or the melamine compound being from about 0.1% by weight to about 5% by weight.

Electrophotographic photoreceptor, process cartridge and image forming apparatus

An electrophotographic photoconductor includes a base, an undercoat layer that contains a metal oxide and an electron-accepting material and has a thickness of about 3 &#x3bc;m or more and about 15 &#x3bc;m or less, and a photosensitive layer containing a polymer having a repeating unit represented by general formula (1) where Rand Reach independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, or an aryl group having 6 to 12 carbon atoms; and m and n each independently represent an integer of 0 to 4.

Electrophotographic photoconductor, process cartridge, and electrophotographic image-forming apparatus

An electrophotographic photoreceptor, includes: a conductive support; and a photosensitive layer provided on or above the conductive support, the photosensitive layer including an outermost surface layer at the farthest location from the conductive support, wherein the outermost surface layer contains: coated insulating inorganic particles obtained by subjecting insulating inorganic particles having a specific surface area of not more than about 300 m/g to a coating treatment with an aromatic functional group-containing compound; and fluorine-containing organic particles.

An image carrier includes a conductive base material and a photosensitive layer formed on the base material. The photosensitive layer has an outermost surface layer that contains particles having a number-averaged particle sphericality represented by Formula (1) of approximately 0.7 or less: sphericality=4&#x3c0;A/L(1), where &#x3c0; represents the circular constant, A represents the projection area of the particle, and L represents the peripheral length of the projected particle image.

Image carrier, process cartridge and image-forming apparatus

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Kanagawa, Japan

Kenta Ide