Fuji Electric Co., Ltd.

Yuji Ogawa

Keiichi Kurokawa

Shinjiro Suzuki

Seizo Kitagawa

Fengqiang Zhu

Tomoki Hasegawa

Hirotaka Kobayashi

Takashi Ueno

An electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer arranged on the conductive substrate and containing, as a charge generating material, any one material selected from the group consisting of titanyl phthalocyanines, metal-free phthalocyanines, chlorogallium phthalocyanines and hydroxygallium phthalocyanines; and, as an electron transporting material, a naphthalene tetracarboxylic acid diimide compound represented by Formula (1) below, where Rand Reach represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkylene group, an alkoxy group, an alkyl ester group, a phenyl group optionally having a substituent, a naphthyl group optionally having a substituent, or a halogen element; and Rand Rare optionally the same or different: The photoreceptor realizes a stable print density even in a low-temperature environment by suppressing a reduction in print density that is caused by potential fluctuation of the photoreceptor in the low-temperature environment.

Photosensitive body for electrophotography, method for producing same and electrophotographic apparatus

The invention provides an electrophotographic photoreceptor, which undergoes little abrasion over long term use and is able to develop a stable image, as well as a method of producing the same and an electrophotographic device including the same. The electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer that contains an inorganic oxide and that is formed on the conductive substrate from a coating liquid. A test slurry containing 20% by mass of the inorganic oxide dispersed in a solvent for forming the coating liquid has a light transmittance of 40% or more in a test case where light having a wavelength of 780 nm irradiates the test slurry.

Electrophotographic photoreceptor, method for producing the same, and electrophotographic device including the same

To reduce the influence of a coupling pin that fixes a shaft to a photoreceptor drum on rotation of a photoreceptor drum. To provide photoreceptor device including: a photoreceptor drum having an insertion hole formed along a lengthwise direction; and a flange that is provided at a lengthwise end portion of the photoreceptor drum and has a through hole formed thereon at a position to overlap the insertion hole, wherein the flange has a first protruding portion and a second protruding portion that: are provided on an end surface at which the through hole is provided and around the through hole; and protrude from the end surface, the first protruding portion has a first opening at a position facing the through hole, and the second protruding portion is provided at a position opposite to the first opening across a center of the through hole on the end surface.

Photoreceptor drum having a flange

An electrophotographic photoreceptor is used by being detachably mounted onto an apparatus main body of an electrophotographic application apparatus while being incorporated in a process cartridge. The electrophotographic photoreceptor has a photosensitive drum formed by forming a photosensitive layer containing a photoconductive material on an outer circumferential surface of a cylindrical conductive substrate; and a flange that is fitted to an open end of the photosensitive drum and transmits a rotational driving force from the apparatus main body to the photosensitive drum. In the flange, on a surface thereof receiving the rotational driving force, a driven-side power transmission portion that is configured by a cylindrical body disposed concentrically with respect to a central shaft of the photosensitive drum, and engaging projections are provided.

Electrophotographic photoreceptor

An electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer provided on the conductive substrate that includes an organic photoconductive material and charge transport materials including a styryl compound represented by structural formula (I) below and a triphenylamine compound represented by structural formula (II) below: 

An electrophotographic photoreceptor is removably installed and used in a device main unit of an electrophotography application device so as to form a process cartridge. The device main unit includes a driving-side power transmission portion. The photoreceptor includes a photosensitive drum including a cylindrical conductive base having a photosensitive layer containing a photoconductive material. A flange is fitted to the photosensitive drum. The flange includes a driven-side driving force transmission portion that has a cylindrical member and engaging protrusions. The flange transmits to the photosensitive drum a rotational driving force from the driving-side power transmission portion. A center of the cylindrical member is disposed on a central axis of the photosensitive drum. The protrusions are parallel to the central axis at positions on the outer periphery of the cylindrical member that trisect the cylindrical member. Each protrusion protrudes in a radial direction and engages the driving-side power transmission portion.

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Kawasaki, Japan

Yuji Ogawa