Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Hiroko Kobayashi

Kosuke Narita

Tomoya Sasaki

Yasuhiko Kinuta

Ryosuke Fujii

Yuto Okazaki

Fuyuki Kano

Shogo Tomari

Akihiro Nonaka

Yuki Tagawa

Yoshiteru Yamada

Yasuhiro Arima

An electrophotographic photoreceptor includes a conductive base body and a multilayered photosensitive layer disposed on the conductive base body and including a charge generation layer and a charge transport layer, wherein the charge transport layer is an uppermost surface layer and contains a charge transport material, a polyester resin, and a compound (T) represented by Formula (T) below, the polyester resin includes a polyester resin (1) including at least one selected from the group consisting of a diol unit (P1) represented by Formula (P1), a diol unit (P2) represented by Formula (P2), a diol unit (P3) represented by Formula (P3), a diol unit (P5) represented by Formula (P5), and a diol unit (P6) represented by Formula (P6), the polyester resin (1) further includes a unit including a biphenyl skeleton, and end groups of the polyester resin (1) do not include fluorine atoms.

Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An image forming apparatus includes an electrophotographic photoreceptor that has a photosensitive layer constituting a surface of the electrophotographic photoreceptor, a charging device that charges the surface of the electrophotographic photoreceptor, an electrostatic charge image forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor, a developing device that accommodates a developer containing a toner which contains toner particles and an external additive, and develops the electrostatic charge image formed on the surface of the electrophotographic photoreceptor by the developer as a toner image, a transfer device that transfers the toner image formed on the surface of the electrophotographic photoreceptor to a surface of a recording medium, and a cleaning device that includes a cleaning blade coming into contact with the surface of the electrophotographic photoreceptor and cleaning at least residual toner particles on the surface of the electrophotographic photoreceptor.

Image forming apparatus and process cartridge

A charging member includes a conductive substrate, an elastic layer disposed on the conductive substrate, and a surface layer disposed on the elastic layer. Regarding the surface of the surface layer, in the axial direction, the ratio of the mean spacing of profile irregularities Sm to the ten-point mean roughness Rz and the reduced peak height Spk respectively satisfy 15&#x2264;Sm/Rz&#x2264;35 and Spk&#x2264;5 &#x3bc;m.

Charging member, charging device, process cartridge, and image forming apparatus

A charging device includes: a charging member that charges an image holding member according to a contact charging method, and includes a conductive substrate and a surface layer provided on the conductive substrate; and a clean member that cleans the charging member while contacting the charging member, and includes a shaft and a foamed elastic layer provided on the shaft, wherein a ratio of a distance between irregularities in an axial direction of the surface layer in the charging member (Sm) to a width of a nodal section of a foam cell wall surface protruding from a surface of the foamed elastic layer in the clean member (W) satisfies 2.4&#x2264;Sm/W&#x2264;5.9.

Charging device, process cartridge, and image forming apparatus

A toner set for electrostatic image development includes a cyan toner, a magenta toner, and a yellow toner, wherein the Vicat softening temperatures of the toners are respectively in the range of from about 30&#xb0; C. to about 60&#xb0; C., and among the toners, the difference between the Vicat softening temperature of the toner having the highest Vicat softening temperature and the Vicat softening temperature of the toner having the lowest Vicat softening temperature is from about 1&#xb0; C. to about 5&#xb0; C.

Toner set for electrostatic image development, developer set for electrostatic image development, process cartridge set, image forming apparatus, and image forming method

The present invention provides a toner for developing an electrostatic charge image including toner particles having residual ammonium ions and silica particles containing a chlorine compound as an external additive.

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

Growing community of inventors

Kanagawa, Japan

Hiroko Kobayashi