Abstract: A development roller for an electrophotographic device that can both reduce resistance and suppress bleeding-out of an ion-conducting agent is provided. A development roller for an electrophotographic device 10 is provided with a shaft body 12, an elastic body layer 14 formed on the outer periphery of the shaft body 12, and a surface layer formed on the outer periphery of the elastic body layer 14. The surface layer 16 includes the following constituents (a) to (c), and the content of constituent (b) is 3.0 to 60 parts by mass, relative to 100 parts by mass of constituent (a). Constituent (a) is a binder comprising acrylonitrile-butadiene rubber, where the content of acrylonitrile is 31 mass % or more and 36 mass % or less. Constituent (b) is an ion-conducting agent. Constituent (c) is an acrylic polymer comprising at least one selected from among a silicone group and a fluorine group.

Abstract: A development roller for an electrophotographic device that can both reduce resistance and suppress bleeding-out of an ion-conducting agent is provided. A development roller for an electrophotographic device 10 is provided with a shaft body 12, an elastic body layer 14 formed on the outer periphery of the shaft body 12, and a surface layer formed on the outer periphery of the elastic body layer 14. The surface layer 16 includes the following constituents (a) to (c), and the content of constituent (b) is 3.0 to 60 parts by mass, relative to 100 parts by mass of constituent (a). Constituent (a) is a binder comprising acrylonitrile-butadiene rubber, where the content of acrylonitrile is 31 mass % or more and 36 mass % or less. Constituent (b) is an ion-conducting agent. Constituent (c) is an acrylic polymer comprising at least one selected from among a silicone group and a fluorine group.

Abstract: Provided is a hydrogen concentration measuring device capable of measuring with high accuracy a hydrogen concentration over an extensive range by a simple configuration. The device includes: a sensor chip which detects the electric resistance of a sensing film; an optical measurement unit which detects the transmitted light intensity of the film; and a controller. The controller performs measurement processing such that a hydrogen concentration in the gas atmosphere is measured based on the detected electric resistance in a first measurement range and based on the detected transmitted light intensity in a second measurement range and is determined so as to reduce a difference between the hydrogen concentration based on the detected electric resistance and the hydrogen concentration based on the detected transmitted light intensity in the overlap of the first measurement range and the second measurement range.

Abstract: Provided is a hydrogen concentration measuring device capable of measuring with high accuracy a hydrogen concentration over an extensive range by a simple configuration. The device includes: a sensor chip which detects the electric resistance of a sensing film; an optical measurement unit which detects the transmitted light intensity of the film; and a controller. The controller performs measurement processing such that a hydrogen concentration in the gas atmosphere is measured based on the detected electric resistance in a first measurement range and based on the detected transmitted light intensity in a second measurement range and is determined so as to reduce a difference between the hydrogen concentration based on the detected electric resistance and the hydrogen concentration based on the detected transmitted light intensity in the overlap of the first measurement range and the second measurement range.

Abstract: In an optical deflector apparatus including a mirror, an inner frame, an outer frame, an inner piezoelectric actuator adapted to flex the mirror around an axis of the mirror, an outer piezoelectric actuator adapted to flex the mirror around the axis of the mirror, and a driver adapted to generate an offset drive voltage and a rocking drive voltage. The offset drive voltage is applied to a first piezoelectric actuator selected from the inner piezoelectric actuator and the outer piezoelectric actuator. The rocking drive voltage is applied to a second piezoelectric actuator different from the first piezoelectric actuator.

Abstract: An optical deflector includes a mirror structure having a symmetrical axis on a plane of the mirror structure, an outer frame surrounding the mirror structure, and at least one meander-type piezoelectric actuator coupled between the mirror structure and the outer frame and having a plurality of piezoelectric cantilevers in parallel with the symmetrical axis folded at folded portions. The mirror structure is divided into a first half portion and a second half portion along the symmetrical axis. The first half portion is close to a closest one of the folded portions, and the second half portion is far from the closest one of the folded portions. A mass of the second half portion is larger than a mass of the first half portion.

Abstract: In an optical deflector apparatus including a mirror, an inner frame, an outer frame, an inner piezoelectric actuator adapted to flex the mirror around an axis of the mirror, an outer piezoelectric actuator adapted to flex the mirror around the axis of the mirror, and a driver adapted to generate an offset drive voltage and a rocking drive voltage. The offset drive voltage is applied to a first piezoelectric actuator selected from the inner piezoelectric actuator and the outer piezoelectric actuator. The rocking drive voltage is applied to a second piezoelectric actuator different from the first piezoelectric actuator.

Abstract: An optical deflector includes a mirror structure having a symmetrical axis on a plane of the mirror structure, an outer frame surrounding the mirror structure, and at least one meander-type piezoelectric actuator coupled between the mirror structure and the outer frame and having a plurality of piezoelectric cantilevers in parallel with the symmetrical axis folded at folded portions. The mirror structure is divided into a first half portion and a second half portion along the symmetrical axis. The first half portion is close to a closest one of the folded portions, and the second half portion is far from the closest one of the folded portions. A mass of the second half portion is larger than a mass of the first half portion.

Abstract: In an optical deflector including a mirror, a rib formed at an outer circumference of the mirror, a support frame surrounding the mirror, at least one torsion bar arranged along an axis of the mirror and coupled between the support frame and the mirror, and a pair of actuators arranged between the support frame and the torsion bar, a recess opposing the torsion bar is formed within the rib.

Abstract: The charging roller has a base layer formed of an electroconductive rubber composition containing (a) a polar rubber having an unsaturated bond or an ether bond, (b) an ion carrier containing one or more phosphonium salts selected from the group consisting of phosphonium salts having the formulae (1) and (2), and (c) a cross-linker, wherein the amount of (b) component ranges from 0.1 to 10 parts by mass per 100 parts by mass of the (a) component. The formula (1) represents [(H9C4)3(CnH2n+1)P]+(CF3SO2)2N—, and the formula (2) represents [(H9C4)3(CnH2n+1)P]+(CF3SO3)—.

Abstract: In an optical deflector including a mirror, a rib formed at an outer circumference of the mirror, a support frame surrounding the mirror, at least one torsion bar arranged along an axis of the mirror and coupled between the support frame and the mirror, and a pair of actuators arranged between the support frame and the torsion bar, a recess opposing the torsion bar is formed within the rib.

Abstract: A conductive member for an electrophotographic device includes a conductive rubber elastic layer. The conductive rubber elastic layer is composed of a cross-linked product of a conductive rubber composition containing (a) a polar rubber, (b) at least one ion-conductive agent selected from diallyldimethylammonium.bis(trifluoromethanesulfonyl)imide and diallyldimethylammonium.trifluoromethanesulfonate and (c) a cross-linking agent, and the cross-linked product has a relative dielectric constant of 23 or more.

Abstract: A perovskite phosphor film emitting red light from among the three primary colors (i.e., red, green and blue) underlying the construction of displays which is fabricated by adsorbing a nanosheet as a seed layer on a solid substrate and forming an oriented film of an oxide phosphor thereon, characterized in that the perovskite phosphor film comprises a film of an oxide phosphor (3) having a high transparency that is formed on a seed layer comprising a nanosheet (2) that is adsorbed on a solid substrate (1) such as a glass substrate or the like, and the oxide phosphor (3) is (SrxCa1-x)1-yPryTiO3: 0?x?0.8, 0.001?y?0.01.

Abstract: The charging roller has a base layer formed of an electroconductive rubber composition containing (a) a polar rubber having an unsaturated bond or an ether bond, (b) an ion carrier containing one or more phosphonium salts selected from the group consisting of phosphonium salts having the formulae (1) and (2), and (c) a cross-linker, wherein the amount of (b) component ranges from 0.1 to 10 parts by mass per 100 parts by mass of the (a) component. The formula (1) represents [(H9O4)3(CnH2n+1)P]+(CF3SO2)2N—, and the formula (2) represents [(H9O4)3(CnH2n+1)P]+(CF3SO3)—.

Abstract: A perovskite phosphor film emitting red light from among the three primary colors (i.e., red, green and blue) underlying the construction of displays which is fabricated by adsorbing a nanosheet as a seed layer on a solid substrate and forming an oriented film of an oxide phosphor thereon, characterized in that the perovskite phosphor film comprises a film of an oxide phosphor (3) having a high transparency that is formed on a seed layer comprising a nanosheet (2) that is adsorbed on a solid substrate (1) such as a glass substrate or the like, and the oxide phosphor (3) is (SrxCa1-x)1-y,PryTiO3: 0?x?0.8, 0.001?y?0.01.