Ricoh Company, Ltd.

Yamanashi Electronics Co., Ltd.

Eiji Kurimoto

Tetsuro Suzuki

Keisuke Shimoyama

Hidetoshi Kami

Takaaki Ikegami

Nozomu Tamoto

Tatsuya Niimi

Tomoharu Asano

Toshihiro Ishida

Daisuke Nii

Akihiko Matsuyama

Akihiro Sugino

Ryohichi Kitajima

Hiroyuki Nagashima

Hideo Yoshizawa

Eisaku Murakami

Yoshiyuki Kimura

Hideki Zemba

Hiroshi Tamura

Shinichi Kawamura

Yoshiaki Kawasaki

Hiroshi Ikuno

Yasuyuki Yamashita

Yuji Arai

Narihito Kojima

Hajime Suzuki

Takeshi Takada

Kohsuke Yamamoto

Katsuichi Ohta

Hideo Nakamori

Hideki Nakamura

Tomoyuki Shimada

Hiroshi Ishii

Kazukiyo Nagai

Yuuji Tanaka

Masafumi Ohta

Yohta Sakon

Yoshiki Yanagawa

Hiroshi Nagame

Takashi Rokutanzono

Michitaka Sasaki

Yuka Miyamoto

Tadayoshi Uchida

Toshihiko Koizumi

Akihiko Matuyama

Masaomi Sasaki

Masami Tomita

Takeshi Uchitani

Yasuo Suzuki

Toshio Koike

Takeshi Shintani

Naohiro Kumagai

Naohiro Toda

Masanori Kawasumi

Atsushi Sampe

Masayuki Koyano

Masato Yanagida

Shinji Nohsho

Michio Kimura

Takeshi Orito

Kaoru Tadokoro

Megumi Kawahara

Shinji Nousho

Ryohta Takahashi

Tetsuya Sakuma

Takumi Shinohara

Shin-ichi Kawamura

Shinich Kawamura

Ishii Hiroshi

Takeshi Kishinekoen Southern Hills 2-102 Takada

A photoconductor including a conductive support, an undercoat layer, a charge-generating layer, and a charge-transporting layer, at least the undercoat layer, the charge-generating layer, and the charge-transporting layer being disposed on the conductive support in an order mentioned, wherein the undercoat layer includes a binder resin and metal oxide particles, and the charge-generating layer includes a binder resin, a titanyl phthalocyanine pigment, and a salicylic acid derivative.

Photoconductor, image forming apparatus, and process cartridge

An electrophotographic photoconductor including a support, an undercoat layer, and a photoconductive layer, the undercoat layer and the photoconductive layer being disposed on the support in an order mentioned, wherein the undercoat layer includes zinc oxide particles, a urethane bond-containing resin, and methylethyl ketone oxime, and the undercoat layer satisfies a formula below:10&#x3c;&#x3c;400&#x2003;&#x2003;(Formula)where M is a ratio (ppm) of the methylethyl ketone oxime included in the undercoat layer, and L is an average thickness (&#x3bc;m) of the undercoat layer.

Electrophotographic photoconductor, image forming apparatus, and process cartridge

A photoconductor is provided. The photoconductor includes a support, an undercoat layer overlying the support, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a binder resin and a zinc oxide particle. The photosensitive layer includes a compound represented by the following formula (1): where each of Rand Rindependently represents an alkyl group or an aromatic hydrocarbon group.

A photoconductor includes an electroconductive substrate; an undercoat layer overlying the electroconductive substrate; and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a urethane resin, a metal oxide particle and a compound having the following formula (1): wherein R1 to R8 independently represent a hydrogen atom, a nitro group, a cyano group, a halogen atom, a hydroxyl group, a saturated or an unsaturated aliphatic hydrocarbon group optionally having a substituent, an aromatic hydrocarbon group optionally having a substituent, an alkoxy group optionally having a substituent, an aryloxy group optionally having a substituent, a sulfo group optionally having a substituent, an amino group, a dialkylamino group optionally having a substituent or an diarylamino group optionally having a substituent; and R3 and R4, R4 and R5, R6 and R7, and R7 and R8 may be bonded with each other to form an aromatic ring.

A photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, the undercoat layer being disposed over the conductive support, the photoconductive layer being disposed over the undercoat layer, wherein the undercoat layer includes zinc oxide particles, wherein when a film thickness of the undercoat layer is 20 &#x3bc;m, the undercoat layer has transmittance of 50% or more to light having a wavelength in a range of 500 nm or more but 800 nm or less, wherein a lowest transmittance of light is 85% or less in the range, and wherein when an electric field of 5 V/&#x3bc;m is applied to the undercoat layer, volume resistivity of the undercoat layer is 1.0&#xd7;10&#x3a9;&#xb7;cm or more but 5.0&#xd7;10&#x3a9;&#xb7;cm or less at an environment of 23&#xb0; C. and 55% RH.

Provided is a photoconductor including a conductive support, an intermediate layer containing metal oxide particles, and a photoconductive layer. The intermediate layer and the photoconductive layer are provided over the conductive support in the order of reciting. An elastic power (We/Wt value) of the intermediate layer is greater than or equal to 20.0% but less than 35.0%. A Martens hardness (HM) of the intermediate layer is greater than or equal to 350 [N/mm] but less than 450 [N/mm].

Photoconductor, electrophotographic method, electrophotographic apparatus, and electrophotographic process cartridge

A electrophotographic photoconductor is provided. The electrophotographic photoconductor includes a conductive support, an undercoat layer overlying the conductive support, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a metal oxide particle, binder resin, and a compound having a urea group.

An electrophotographic photoconductor including a support, an undercoat layer overlying the support, and a photosensitive layer overlying the undercoat layer is provided. The undercoat layer includes zinc oxide particles and a binder resin. The undercoat layer has a voltage (V)-current (I) characteristics such that, when S1 is a value obtained by integrating current (I [A]) in terms of voltage (V [V]) from 0 to a distribution voltage V[V] distributed to the undercoat layer, and S2 is a value obtained by integrating a line connecting two points at a voltage (V [V]) of 0 and the distribution voltage V[V] in terms of voltage (V [V]) from 0 to the distribution voltage V[V], S1 is within a range of from 1.0&#xd7;10to 1.0&#xd7;10and a ratio (S1/S2) of S1 to S2 is 0.50 or less.

An electrophotographic photoreceptor includes a substrate, an undercoat layer overlying the substrate, and a photosensitive layer overlying the undercoat layer. The undercoat layer includes a binder resin, a metal oxide particle and a compound having a thiol group.

Electrophotographic photoreceptor, image forming apparatus, and process cartridge

A photoconductor is provided. The photoconductor includes an electroconductive substrate; an intermediate layer located overlying the electroconductive substrate; and a photosensitive layer located overlying the intermediate layer. The intermediate layer includes at least a resin, and a particulate zinc oxide that includes sodium, sulfur and calcium in amounts of from 10 ppm to 200 ppm, from 50 ppm to 500 ppm, and from 10 ppm to 200 ppm, respectively.

Electrophotographic photoconductor, and image forming method, image forming apparatus, and process cartridge using the electrophotographic photoconductor

An electrophotographic photoconductor including: an electroconductive substrate; an intermediate layer; and a photoconductive layer, the intermediate layer and the photoconductive layer being on the electroconductive substrate, wherein the intermediate layer includes an inorganic pigment and a binder resin, wherein a volume ratio of the inorganic pigment in the intermediate layer is 30% by volume to 50% by volume, wherein the inorganic pigment comprises titanium oxide and a content of the titanium oxide in the inorganic pigment is 70% by mass to 90% by mass, wherein the inorganic pigment has a specific surface area of 70 m/g to 140 m/g, and wherein the intermediate layer has a volume resistivity at an electrical field intensity of 2.5&#xd7;10V/cm of 5&#xd7;10&#x3a9;&#xb7;cm to 1&#xd7;10&#x3a9;&#xb7;cm.

Electrophotographic photoconductor, electrophotographic apparatus and process cartridge

An image forming apparatus having a rotary image bearing member, a charging device to charge the image bearing member. an irradiator to irradiate the image bearing member to form a latent electrostatic image thereon, a developing device to develop the latent electrostatic image with a developing agent containing toner to obtain a visible image, a transfer device to transfer the visible image to a recording medium, a first cleaner that slidably contacts the image bearing member to remove toner remaining thereon, a driving mechanism to drive the image bearing member at different linear speeds, a noise detector provided in the vicinity of the image bearing member to detect noise, and an abnormal noise predictor device to predict whether abnormal noise hear during image formation based on noise detected by the noise detector when the image bearing member is driven not during image formation at a linear speed different from that during image formation.

Image forming apparatus

An image forming apparatus including at least an image bearing member having a substrate having a photosensitive layer thereon, the image bearing member to bear a latent electrostatic image on a surface thereof, a charging device to the surface of the image bearing member, an irradiation device to irradiate the surface of the image bearing member with light to form a latent electrostatic image thereon, a development device to develop the latent electrostatic with toner to obtain a developed image, a transfer device to transfer the developed image to a recording medium, and a cleaning device to clean the surface of the image bearing member, wherein the photosensitive layer includes naphthalene tetracarbonic acid diimide derivative as a charge transport material represented by the following Chemical Structure (1):  In the Chemical Structure (1), Z represents a group represented by the following Chemical Formula (1): or the following Chemical Formula (2):&#x2014;R&#x2003;&#x2003;Chemical Formula (2). In the Chemical Structure (1), and the Chemical Formulae (1) and (2), R, R, R, Rand Reach, independently, represent a substituted or non-substituted alkyl group or a substituted or non-substituted aromatic hydrocarbon group, R, R, Rand Reach, independently, represent hydrogen atom, a substituted or non-substituted alkyl group, or a substituted or non-substituted aromatic hydrocarbon group, and Rand Rand Rand Roptionally share a bond connectivity to form a substituted or non-substituted heterocyclic group including a nitrogen atom.

Image forming apparatus and process cartridge

An electrophotographic photoconductor including a conductive substrate and a photoconductive layer thereover, wherein the photoconductive layer contains a charge generation agent and a charge transport agent represented by General Formula (A-I), (B-I) or (C-I), and an amine compound represented by General Formula (II):    

Electrophotographic photoconductor, and electrophotographic method, electrophotographic apparatus and process cartridge containing the electrophotographic photoconductor

An electrophotographic photoconductor including an electroconductive support and a photoconductive layer provided thereon, wherein the photoconductive layer includes a charge generating material, an electron transporting material and a hole transporting material, the electron transporting material being a diphenoquinone compound represented by formula (1) described herein, the hole transporting material being a compound represented by formula (2) described herein.

Electrophotographic photoconductor

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Numazu, Japan

Eiji Kurimoto