Fuji Xerox Co., Ltd.

Yu Nakamura

Daisuke Tano

Masato Ono

Noriaki Kojima

Kei Tanaka

Tsutomu Sugimoto

Shintaro Kikuchi

Yuko Kawase

Daisuke Tanaka

Masayuki Seko

Keisuke Kusano

Yoshinori Takahashi

Hiroaki Akamatsu

An electrophotographic photoreceptor includes a conductive substrate and a single-layer-type photosensitive layer on the conductive substrate. The single-layer-type photosensitive layer contains a binder resin, a charge generating material, an electron transporting material, and two hole transporting materials having different redox potentials. The two hole transporting materials are a hole transporting material A and a hole transporting material B that has a redox potential lower than that of the hole transporting material A. The ratio A/B of a weight of the hole transporting material A to a weight of the hole transporting material B is about 12/1 or more and about 36/1 or less.

Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer of a single-layer type disposed on the conductive substrate. The photosensitive layer has an absorption coefficient of 0.008 or less at a wavelength of 1000 nm and contains a binder resin, a charge generating material, an electron transporting material, and a hole transporting material. The charge generating material is at least one selected from a hydroxygallium phthalocyanine pigment and a chlorogallium phthalocyanine pigment and is contained in an amount of 0.9% by weight or more and 1.8% by weight or less relative to the binder resin.

A cleaning member includes a base member comprised of a first material that has a peak temperature of tan &#x3b4; less than approximately zero degrees Celsius and a contact portion comprised of a second material that has a higher hardness than the first material and a tear strength of approximately 49 kilonewtons per meter or higher, the contact portion contacting an image carrier and cleaning the image carrier.

Cleaning member and image forming apparatus

A cleaning blade that contacts a cleaning target member having a cleaning target surface which moves, and cleans the cleaning target surface, includes a blade body; and a blade protrusion that is present at an end portion of a lower surface of the blade body near a distal end surface of the blade body, has a shape protruding outward in a thickness direction with respect to the lower surface, and has an inclined surface being a surface continued from the distal end surface and inclined outward in the thickness direction with respect to the lower surface and inward in a height direction with respect to the distal end surface from an end of the distal end surface near the lower surface. At least a portion of the incline surface is a contact surface that contacts the cleaning target member.

Cleaning blade, process cartridge, and image forming apparatus

A cleaning blade includes a polyurethane member that constitutes at least a contact portion that comes in contact with a member to be cleaned. The polyurethane member contains a polyurethane containing a hard segment component and a soft segment component. The hard segment component has a domain particle size of about 45 nm or more and about 100 nm or less.

A cleaning blade includes a polyurethane member that contains a polyurethane, the polyurethane member constituting at least a contact portion that comes in contact with a member to be cleaned. An infrared absorption spectrum obtained by infrared spectroscopy of the polyurethane member has a peak intensity ratio (A/B) of about 1.1 or more, where A represents an intensity of a spectral peak due to a carbonyl group that does not form a hydrogen bond, the spectral peak appearing in a range of about 1,730 cmor more and about 1,740 cmor less, and B represents an intensity of a spectral peak due to a carbonyl group that forms a hydrogen bond, the spectral peak appearing in a range of about 1,670 cmor more and about 1,720 cmor less.

A sliding member includes a base material including a contact area which contacts with a member to be slid, wherein a Young's modulus E1 with respect to the thickness of the contact area from a surface of the contact area is from 10 MPa to 200,000 MPa and a thickness T of the contact area is from 10 nm to 500 nm.

Sliding member with a base material for contacting a member to be slid, process cartridge having the sliding member, and image forming apparatus having the sliding member

Disclosed is a cleaning blade of which a contact portion brought into contact with at least a member to be cleaned is formed of a polyurethane member that includes a polyurethane material containing a hard segment and a soft segment and has a ratio of an area occupied by a hard segment aggregate having a diameter of 0.3 &#x3bc;m to 0.7 &#x3bc;m in a cross section being in a range of 2% to 10%.

A cleaning blade includes a member in which, in thermal analysis with a differential scanning calorimeter, a heat of crystal fusion &#x394;H1 (mJ/mg) in a crystal fusion peakin a range of about 70&#xb0; C. or higher and lower than about 110&#xb0; C., a heat of crystal fusion &#x394;H2 (mJ/mg) in a crystal fusion peakin a range of about 110&#xb0; C. or higher and lower than about 170&#xb0; C., and a heat of crystal fusion &#x394;H3 (mJ/mg) in a crystal fusion peakin a range of about 170&#xb0; C. or higher and about 200&#xb0; C. or lower satisfy formulae (1) to (4), the member constituting at least a contact portion that comes in contact with a member to be cleaned.&#x394;1+&#x394;2&#x3e;&#x394;3&#x2003;&#x2003;Formula (1)0.0&#x2266;&#x394;1&#x2266;5.0&#x2003;&#x2003;Formula (2)0.1&#x2266;&#x394;2&#x2003;&#x2003;Formula (3)0.0&#x2266;&#x394;3&#x2266;2.0&#x2003;&#x2003;Formula (4)

A cleaning blade includes a portion which comes in contact with a member to be cleaned, and the portion is configured of a member containing polyurethane rubber having a structure derived from polyester polyol in which a first diol component having 10 or more carbon atoms and a second diol component having 5 or less carbon atoms are condensed with dicarboxylic acid at a molar ratio (first diol component/second diol component) of 50/50 to 80/20, a structure derived from polyisocyanate, and a structure derived from a triol.

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Kanagawa, Japan

Yu Nakamura