Abstract: An electrophotographic photoreceptor includes a photosensitive layer on a support, wherein the photosensitive layer includes at least a charge generating layer, a charge transporting layer, and a protective layer, the charge generating layer contains titanyl phthalocyanine or a derivative thereof, the charge transporting layer contains a charge transporting material, the protective layer contains a reactant of a polymerizable monomer having a charge transporting structure and a polymerizable monomer having no charge transporting structure, and the charge transporting material, and a ratio of the mass of the charge transporting material contained in the protective layer is greater than 3% by mass and less than 9% by mass with respect to the total mass of a reactant of the polymerizable monomer having the charge transporting structure and the polymerizable monomer having no charge transporting structure, and the charge transporting material.

Abstract: A power conversion device according to an embodiment includes: a voltage regulator circuit configured to regulate power from a power source to a desired voltage; an inverter configured to convert the power output from the voltage regulator circuit into an alternate current power; a resonant circuit having inductance and capacitance; a high frequency transformer configured to convert the alternate current power of the inverter; a rectifier configured to convert the alternate current power output from the high frequency transformer into a direct current power; a temperature detector configured to detect a temperature of the resonant circuit; and a controller configured to detect an anomalous resonant frequency when the temperature is equal to or higher than a predetermined temperature threshold to control an anomalous state.

Abstract: Provided is an electrophotographic photoreceptor capable of reducing the rotational torque of the photoreceptor and also reducing the increase in the rotational torque during long-term use when a cured layer obtained by curing a charge transporting compound having a radically polymerizable group is used as a protective layer. In the electrophotographic photoreceptor, a conductive support, a photosensitive layer, and a protective layer are laminated in this order. The protective layer is formed of a cured product of a composition containing the following: a charge transporting compound having a radically polymerizable functional group; and metal oxide particles surface-treated with a surface treating agent having a silicone chain in a side chain thereof.

Abstract: Provided is an electrophotographic photoreceptor having at least a charge transport layer and a protective layer sequentially laminated on a conductive support, wherein the protective layer contains a cured product of a composition containing a charge transport compound having a chain polymerizable functional group; the charge transport layer and the protective layer are continuously laminated with intervening a mixed layer therebetween in which components of both layers of the charge transport layer and the protective layer are compatible; and the mixed layer has a thickness in the range of 0.1 to 1.0 ?m.

Abstract: An object of the present invention is achieved by an electrophotographic photoreceptor containing a conductive support sequentially laminated thereon with at least a photosensitive layer and a protective layer in that order, wherein the protective layer includes a cured composition having a radical polymerizable compound for a binder, a charge transport agent having a radical polymerizable functional group, and a photopolymerization initiator; the charge transport agent having a radical polymerizable functional group has a maximum absorption wavelength in the range of 405±50 nm; and the charge transport agent having a radical polymerizable functional group and the photopolymerization initiator satisfy Formula (A), ?G=Eox(D/D+)?Ered(A?/A)?E*??0.2 (eV).

Abstract: A lighting device includes a substrate having a side extending straight in a first direction and a first LED chip supported by the substrate and having a first anode terminal and a first cathode terminal. The lighting device includes a second LED chip and a third LED chip supported by the substrate, being electrically connected to the second cathode terminal, and being overlapped with the first LED chip when viewed in a second direction that is perpendicular to the first direction. The lighting device includes a connecting portion that connects the first cathode terminal and the second anode terminal with each other, at least a portion of the connecting portion angled at an acute angle with respect to the second direction.

Abstract: An electrophotographic photoreceptor according to the present invention includes a conductive support, a photosensitive layer, and a protective layer disposed in sequence. The protective layer includes a cured product of a composition containing a radically polymerizable compound, a charge transporting material exhibiting a maximal absorption wavelength of 405±50 nm, and a photopolymerization initiator of a single-molecule system; and a following Expression (A) is satisfied: G=Eox(D/D+)?Ered(A?/A)?E*??0.2 [eV]??Expression (A): G represents a free energy change, Eox(D/D+) represents an oxidation potential of the charge transporting material, Ered(A?/A) represents a reduction potential of the photopolymerization initiator, and E* represents an excitation energy of the charge transporting material.

Abstract: Provided is an electrophotographic photoreceptor including a conductive support, a photosensitive layer, and a surface protective layer disposed in sequence. The surface protective layer includes a cured product of a composition containing a polymerizable compound, a charge transporting material, and at least two polymerization initiators. The polymerization initiators include an acyl phosphine oxide and an O-acyl oxime.

Abstract: An object of the present invention is achieved by an electrophotographic photoreceptor containing a conductive support sequentially laminated thereon with at least a photosensitive layer and a protective layer in that order, wherein the protective layer includes a cured composition having a radical polymerizable compound for a binder, a charge transport agent having a radical polymerizable functional group, and a photopolymerization initiator; the charge transport agent having a radical polymerizable functional group has a maximum absorption wavelength in the range of 405±50 nm; and the charge transport agent having a radical polymerizable functional group and the photopolymerization initiator satisfy Formula (A), ?G=Eox(D/D+)?Ered(A?/A)?E*??0.2(eV).

Abstract: An electrophotographic photoreceptor according to the present invention includes a conductive support, a photosensitive layer, and a protective layer disposed in sequence. The protective layer includes a cured product of a composition containing a radically polymerizable compound, a charge transporting material exhibiting a maximal absorption wavelength of 405±50 nm, and a photopolymerization initiator of a single-molecule system; and a following Expression (A) is satisfied: G=Eox(D/D+)?Ered(A?/A)?E*??0.2 [eV]??Expression (A): G represents a free energy change, Eox(D/D+) represents an oxidation potential of the charge transporting material, Ered(A?/A) represents a reduction potential of the photopolymerization initiator, and E* represents an excitation energy of the charge transporting material.

Abstract: An electrophotographic photoconductor (photoconductor) according to the embodiment includes a conductive support, a photosensitive layer, and a protective layer. The protective layer is composed of a cured product as one body obtained by a radical reaction of a composition containing a radical polymerizable monomer having a radical polymerizable functional group, a metal oxide fine particle having a radical polymerizable functional group, and camphorquinone or a derivative thereof. The photoconductor is installed in an image forming apparatus equipped with a cleaning device for removing transfer residual toner on the photoconductor, and the cleaning device includes an elastic cleaning member disposed so that it can come into contact with the surface of the photoconductor.

Abstract: Provided is an electrophotographic photoreceptor including a conductive support, a photosensitive layer, and a surface protective layer disposed in sequence. The surface protective layer includes a cured product of a composition containing a polymerizable compound, a charge transporting material, and at least two polymerization initiators. The polymerization initiators include an acyl phosphine oxide and an O-acyl oxime.

Abstract: An imaging apparatus including: an electrophotographic photoreceptor; a charging unit to charge the surface of the electrophotographic photoreceptor; an exposing unit to perform exposure of the electrophotographic photoreceptor charged by the charging unit; a developing unit to feed a toner to the electrophotographic photoreceptor exposed by the exposing unit to form a toner image; a transfer unit to transfer the toner image formed on the electrophotographic photoreceptor; a lubricant feeding unit to feed a lubricant onto the surface of the electrophotographic photoreceptor; and a cleaning unit to remove the residual toner on the surface of the electrophotographic photoreceptor, wherein the electrophotographic photoreceptor includes a conductive support, a photoreceptive layer, and a protective layer disposed in sequence, the protective layer includes a resin containing a particulate P-type semiconductor, and the protective layer has a surface roughness Rz of 0.030 ?m or more and 0.075 ?m or less.

Abstract: An electrophotographic photoreceptor includes an intermediate layer, a photosensitive layer, and a surface protective layer, deposited in this order on an electroconductive support. The surface protective layer includes a resin and a p-type semiconductor microparticle contained in the resin. The intermediate layer includes a resin and at least one metal oxide microparticle contained in the resin. The at least one metal oxide microparticle is selected from the group consisting of untreated tin oxide particles, tin oxide particles surface-treated with organic compounds, untreated anatase titanium oxide particles, anatase titanium oxide particles surface-treated with organic compounds, untreated rutile titanium oxide particles, and rutile titanium oxide particles surface-treated with organic compounds.

Abstract: A lighting device includes a substrate having a side extending straight in a first direction and a first LED chip supported by the substrate and having a first anode terminal and a first cathode terminal. The lighting device includes a second LED chip and a third LED chip supported by the substrate, being electrically connected to the second cathode terminal, and being overlapped with the first LED chip when viewed in a second direction that is perpendicular to the first direction. The lighting device includes a connecting portion that connects the first cathode terminal and the second anode terminal with each other, at least a portion of the connecting portion angled at an acute angle with respect to the second direction.

Abstract: An electrophotographic photoreceptor includes: a conductive holder; and at least a charge producing layer and a charge transport layer disposed on the conductive holder in order. The charge transport layer contains at least a binder resin, a charge transport agent and a p-type metal oxide particle.

Abstract: A lighting device includes a substrate and a planar light source portion including a plurality of LED chips arrayed on the substrate. The planar light source portion faces an illumination space (space to be illuminated) by a predetermined opening area. The plurality of LED chips are arrayed on the substrate such that the mounting density with respect to the opening area is not less than 3/cm2, and accordingly, a planar light source is formed.

Abstract: A lighting device includes a substrate and a planar light source portion including a plurality of LED chips arrayed on the substrate. The planar light source portion faces an illumination space (space to be illuminated) by a predetermined opening area. The plurality of LED chips are arrayed on the substrate such that the mounting density with respect to the opening area is not less than 3/cm2, and accordingly, a planar light source is formed.

Abstract: A lighting device includes a substrate and a planar light source portion including a plurality of LED chips arrayed on the substrate. The planar light source portion faces an illumination space (space to be illuminated) by a predetermined opening area. The plurality of LED chips are arrayed on the substrate such that the mounting density with respect to the opening area is not less than 3/cm2, and accordingly, a planar light source is formed.

Abstract: The electrophotographic photoreceptor of the present invention at least includes a charge-generating layer, a charge-transporting layer, and a surface protective layer sequentially deposited on an electroconductive support, wherein the charge-transporting layer contains a charge-transporting material having an ionization potential (IPA); the surface protective layer contains a binder resin and a metal oxide microparticle having an ionization potential (IPB); and the ionization potential (IPA) and the ionization potential (IPB) satisfy the relationship represented by Expression (A): ?0.4 eV?(IPA?IPB)?0.4 eV.