Canon Kabushiki Kaisha

Kenichi Ikari

Jun Kamatani

Takeshi Murakami

Satoru Shiobara

Wataru Kitamura

Naoaki Ichihashi

Koichi Suzuki

Akira Tsuboyama

Akihito Saitoh

Toshifumi Mori

Tetsuo Takahashi

Naoki Yamada

Daisuke Kawaguchi

Masashi Hashimoto

Hiroki Ohrui

Takayuki Horiuchi

Kazumichi Sugiyama

Kei Tagami

Masumi Itabashi

Mai Murakami

Yasuhiro Kawai

Hironobu Iwawaki

Yojiro Matsuda

Tetsuya Kosuge

Kengo Kishino

Toshiyasu Shirasuna

Haruki Mori

Chiaki Nishiura

Masanori Muratsubaki

Tomona Yamaguchi

Hironori Owaki

Ryuji Ishii

Ikuyo Kuroiwa

Haruna Iida

An electrophotographic photosensitive member includes a surface layer which exhibits excellent dispersibility of fluorine atom-containing resin particles, and suppresses the occurrence of ghost images. The surface layer contains a fluorine atom-containing resin particle, a binder material, and a polymer A having specific structural units.

Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and method of producing electrophotographic photosensitive member

It is an object of the present invention to provide an electrophotographic photosensitive member capable of suppressing the environmental fluctuation in the electrical characteristics. The present invention provides the electrophotographic photosensitive member in which the surface layer contains the compound having the specific structure.

Electrophotographic photosensitive member, process cartridge and electrophotographic image forming apparatus

A cylindrical electrophotographic photosensitive member having concave portions on a surface thereof includes a region A having concave portions at an end portion in an axial direction of the photosensitive member and a region B having concave portions different from those in the region A in a direction toward a center of the axial direction of the photosensitive member from the region A, wherein in the region A, an average value L1 is 20 to 200 &#x3bc;m, an average value W1 satisfies W1&#x2264;L1, an average value d1 is 1.7 to 4.0 &#x3bc;m, and an area ratio a1 is 5 to 65%; and in the region B, an average value L2 is 20 to 200 &#x3bc;m, an average value W2 satisfies W2&#x2264;L2, an average value d2 is 0.3 to 1.5 &#x3bc;m, and an area ratio a2 is 5 to 65%.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

An organic light emitting element which realizes a high efficiency and long-life light emission is provided. An organic compound represented by the general formula [1] described in Claimis provided. In the general formula [1], Rto Rare each independently selected from a hydrogen atom, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group. However, at least one of Rto Rrepresents the aryl group or the heterocyclic group. The aryl group represents a phenyl group, a naphthyl group, a phenanthrenyl group, a fluorenyl group, a triphenylenyl group, or a chrysenyl group. The heterocyclic group represents a dibenzofuranyl group or a dibenzothienyl group.

Triphenyleno-benzohuran compound and organic light emitting element including the same

Disclosed is a cylindrical electrophotographic photosensitive member having a region A along an outer surface and a region B along the outer surface. In this electrophotographic photosensitive member, the region A is located on an end side in an axial direction of the electrophotographic photosensitive member relative to the region B, the region A has a specific groove provided on the outer surface of the electrophotographic photosensitive member, an area ratio aof the groove is 65% to 100%, the region B has specific concave portions provided on the outer surface of the electrophotographic photosensitive member, and an area ratio aof the concave portion is 5% to 65%.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

Provided is an organic light emitting device having high emission efficiency and a long continuous driving lifetime. The organic light emitting device includes: an anode; a cathode; and an emitting layer placed between the anode and the cathode, in which: the emitting layer contains an emitting material that emits fluorescence; and in an emission wavelength region of the emitting material, an absorption peak of an absorption spectrum in a minimum excited triplet state of a material having a smallest minimum excited triplet energy out of constituent materials in the emitting layer is absent.

Organic light emitting device

There is provided an electrophotographic photosensitive member having a cylindrical shape, including a plurality of concave portions on a surface thereof,

A spiro[cyclopenta[def]triphenylene-4,9'-fluorene] compound having a high triplet energy level and a high glass transition temperature further providing an excellent organic light-emitting device including the compound to achieve a high luminous efficiency and a low driving voltage.

Spiro[cyclopenta[def]triphenylene-4,9'-fluorene] compound and organic light-emitting device having the same

In an electrophotographic photosensitive member, a circumferential surface has concave portions that are independent one another; each of the concave portions has an opening, a contour of the opening has an apex having an angle &#x3b1; of more than 0&#xb0; and 90&#xb0; or less on at least an upstream side of a rotational direction of the electrophotographic photosensitive member, and has a largest width in an axial direction of the electrophotographic photosensitive member of 20 &#x3bc;m or more and 80 &#x3bc;m or less, a width of the contour in the axial direction of the electrophotographic photosensitive member decreasing from a portion having the largest width toward the apex, when viewing each of the concave portions in the axial direction, each of the concave portions has a depth that decreases from a deepest point of each of the concave portions toward the apex.

An undercoat layer of an electrophotographic photosensitive member contains a binder resin and conductive particles. Each of the conductive particles has a core particle coated with tin oxide doped with aluminum.

An electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus wherein a streak-like image defect otherwise occurring in output in a low printing mode performed under a H/H environment can be reduced are provided. A surface of the photosensitive member has a convex and concave portions continuously in a peripheral direction of the photosensitive member, and alternately in an axial direction of the photosensitive member, a width w of the concave portion is 30 to 100 &#x3bc;m, a depth d of the concave portion is 1 to 5 &#x3bc;m, the convex portion has a rising slope and a descending slope in the peripheral direction of the photosensitive member, and a distance from a starting point of the rising slope to an end point of the descending slope and a distance from a starting point of the descending slope to an end point of the rising slope are 300 &#x3bc;m or less.

The present invention provides a novel fused polycyclic compound suitably used for a blue light emitting element and an organic light emitting element including the fused polycyclic compound. A fused polycyclic compound is represented by at least one of the general formulas [1] and [2] according to claim. In the general formulas [1] and [2], Rto Reach represent a hydrogen atom or a substituent.

Fused polycyclic compound and organic light emitting element including the same

An electrophotographic photoconductor has a support medium, an undercoat layer formed immediately on the support medium, and a photosensitive layer formed immediately on the undercoat layer, in which the undercoat layer contains a binding resin and composite particles each containing a core material particle covered with tin oxide doped with a predetermined amount of aluminum.

Electrophotographic photoconductor, process cartridge, and electrophotographic apparatus

An organic light-emitting device that realizes high-emission efficiency and low-driving voltage is provided. The organic light-emitting device contains a xanthone compound represented by general formula [1].

Xanthone compound and organic light-emitting device including the same

A condensed polycyclic compound which emits green light and which has a high chemical stability and an organic light emitting element including the same are provided. A condensed polycyclic compound represented by the general formula [1] or [2] described in claimis provided. In the formula [1] and [2], Rto Rare independently selected from the group consisting of a hydrogen atom, a straight or branched alkyl group having 1 to 4 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 22 carbon atoms.

Growing community of inventors

Abiko, Japan

Kenichi Ikari