Sharp Kabushiki Kaisha Corporation

Akiko Kihara

Akihiro Kondoh

Takatsugu Obata

Hiroshi Sugimura

Kotaro Fukushima

Rikiya Matsuo

Mami Adachi

Masaki Hashimoto

Koichi Toriyama

Tomoko Kanazawa

Takahiro Kurauchi

Chikako Iibachi

Provided is an electrophotographic photoconductor including an outermost surface layer containing inorganic compound microparticles that have a number mean primary particle diameter of 10-40 nm and are dispersed uniformly into the outermost surface layer at a proportion of 7-18% by mass in the outermost surface layer, wherein in slicing the outermost surface layer in its stacking direction with a thickness of 70 nm, observing a strip-shaped sample piece thus obtained in scanning transmission electron microscopy, converting a cross-sectional image thus obtained to an 8-bit binary image, and observing any 50 regions from regions having a 5 μm×5 μm observation field of view in the binary image, the following formula is met: 0.5≤S/N≤2.0, and wherein a maximum gap region has a size of 1.0 μm or less when represents a space with absence of the inorganic compound microparticles converted to an equivalent circle diameter.

Electrophotographic photoconductor and image-forming apparatus including the same

The present invention provides an electrophotographic photoreceptor comprising a multilayered photosensitive layer or a monolayer photosensitive layer,

Electrophotographic photoreceptor and image forming apparatus provided with the same

A rotation driving force transmitting member is disposed between a motor section and a main body of a photoreceptor drum. The rotation driving force transmitting member has a convex member which is provided on the photoreceptor drum side and includes a twisted convex portion with an elliptical cross-section and a concave member which is provided on the motor section side and includes a twisted concave portion with an elliptical cross-section, the concave portion being fitted in the convex portion. The rotation driving force transmitting member transmits rotation driving force by the motor section to the photoreceptor drum via the convex member and the concave member in a state where the convex member is subjected to a drawing force toward the concave member side, due to rotation of the motor section in a state where the convex portion and the concave portion are fitted in each other.

Rotation driving force transmitting member, photoreceptor drum, process cartridge, and image forming apparatus

An electrophotographic photoconductor comprising a charge generation layer containing a charge generation material and a charge transfer layer containing a charge transfer material laminating in this order on a conductive support with an undercoat layer interposed between the charge generation layer and the conductive support, or comprising a monolayer type photosensitive layer containing a charge generation material and a charge transport material being formed on a conductive support with an undercoat layer interposed between the monolayer type photosensitive layer and the conductive support, wherein 

Electrophotographic photoconductor and image forming apparatus using the same

An electrophotographic photoreceptor comprising a layered-type photosensitive layer in which a charge generating layer containing a charge generating material and a charge transporting layer containing a charge transporting material are stacked, formed on a conductive supporting member made of a conductive material, wherein the electrophotographic photoreceptor has high sensitive characteristics to a semiconductor laser beam having a wavelength ranging from 380 to 500 nm; the charge transporting layer of the layered-type photosensitive layer contains as the charge transporting material, a triarylamine dimer compound represented by the general formula (1): wherein Arand Armay be the same or different, and represent an unsubstituted or substituted arylene group or heterocyclic derivative bivalent group, Arand Armay be the same or different, and represent an unsubstituted or substituted aryl group or heterocyclic group, Rand Rmay be the same or different, and represent an alkyl group, m and n represent an integer of 1 to 4, a and b may be the same of different, and represent a hydrogen atom, a halogen atom, or unsubstituted or substituted alkyl group, alkoxy group or amino group;and a film thickness of the photosensitive layer is 30 &#x3bc;m or less.

Electrophotographic photoreceptor, image forming apparatus and process cartridge

In an electrophotographic photoreceptor including a conductive substrate and a single layer type photosensitive layer, the aromatic polycarbonate is contained to a single layer type photosensitive layer, which aromatic polycarbonate includes a constituent unit represented by the following general formula (1) derived from a compound having a basic asymmetric bishydroxy enamine skeleton represented by the general formula: Accordingly, the electrophotographic photoreceptor is obtained which is excellent in charge transportability, mechanical strength, electric property, durability, etc. and can form good images for a long time.

Aromatic polycarbonate, electrophotographic photoreceptor, and image forming apparatus

An method for producing an electrophotographic proreceptor includes a first coating step of applying a coating liquid containing a sublimable antioxidant and a photoconductive substance, onto a conductive substrate to form a first coating film thereon, a first drying step of drying the formed first coating film by heating to form a first photosensitive layer, a second coating step of applying the coating liquid used in the first coating step, onto the first photosensitive layer to form a second coating film, and a second drying step of drying the formed second coating film by heating to form a second photosensitive layer. In the second drying step, the drying condition is made to differ from the drying condition in the first drying step so that a degree of sublimation of the antioxidant in the second drying step is lower than that of sublimation of the antioxidant in the first drying step.

Method for producing electrophotographic photoreceptor having sublimable antioxidant in coating liquid

An electrophotographic photoreceptor having excellent electric characteristics such as sensitivity characteristic and light responsiveness with an excellent life duration of abrasion resistance so that no flaw and density unevenness are generated on to-be-formed images for a long period of time, is provided. In an electrophotographic photoreceptor (), an enamine compound represented by the following general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is contained in a charge transporting layer (), and a creep value (C) in a case where a maximum indentation load of 30 mN is put on a surface for 5 seconds under circumstances of temperature of 25&#xb0; C. and relative humidity of 50%, is set to 2.70% or more and 5.00% or less, and a plastic deformation hardness value (Hplast) of the surface is set to 220 N/mmor more and 275 N/mmor less. 

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Osaka, Japan

Akiko Kihara