8results about "Electrographic processes using charge pattern" patented technology

A developing device includes a rotating member that is formed in a tubular shape, that is provided to be rotatable, that includes one end portion and the other end portion, and that includes an outer peripheral surface to which a developer adheres, plural magnetic poles that are disposed inside the rotating member and that are disposed to be arranged in a rotation direction of the rotating member, a first magnetic member that is disposed outside the rotating member, that is disposed at a position facing the one end portion of the rotating member, that includes a downstream-side end portion, which is an end portion positioned on a downstream side in the rotation direction of the rotating member, and that forms a magnetic field between the first magnetic member and the magnetic poles, and a second magnetic member that is disposed outside the rotating member, that is disposed at a position facing the one end portion of the rotating member, that is disposed to be closer to the other end portion of the rotating member than the first magnetic member is, that forms a magnetic field between the second magnetic member and the magnetic poles, and that includes a facing portion, which is a portion facing the rotating member, in which, in the rotation direction, the facing portion of the second magnetic member is positioned upstream of one of the plural magnetic poles that is positioned upstream of the downstream-side end portion of the first magnetic member in the rotation direction and that is a first magnetic pole counting from the downstream-side end portion.

To improve image quality when embossed paper is used as a recording material with a simple configuration.SOLUTION: An image forming apparatus 100 has an image carrier 1K, toner image forming means 4K, an intermediate transfer body 7, a toner electrifier 17, a toner electrification bias power supply 132, a control unit 120, and an acquisition unit 121 that acquires information on a recording material S to which a toner image is transferred. The control unit 120 can perform control to execute a first image forming mode when a type of the recording material S indicated by the information acquired by the acquisition unit 121 is a first type, and execute a second image forming mode when the type of the recording material S indicated by the information acquired by the acquisition unit 121 is a second type having larger irregularities on a surface than the recording material of the first type. The control unit controls to increase an absolute value of a toner electrification bias in a predetermined environment in the second image forming mode compared with the first image forming mode.SELECTED DRAWING: Figure 5

An image forming apparatus includes an image holding body, a developing device that causes a developer to adhere to the image holding body, and a supply device that supplies the developer to the developing device and that includes an intersection direction flow path, which is a flow path that extends in an intersection direction and through which the developer passes, and a downward flow path, which is a flow path through which the developer moving through the intersection direction flow path passes and that extends downward so that the developer moving downward passes through the downward flow path, the intersection direction being a direction intersecting a perpendicular direction, in which a partition that partitions a space in the downward flow path and that partitions the space into a space positioned on an upstream side in a movement direction of the developer in the intersection direction flow path and a space positioned on a downstream side in the movement direction.

Even in situations where highly charged foreign matter may be generated, this suppresses the occurrence of image defects caused by foreign matter such as paper dust getting trapped between the developer carrier and the layer thickness regulating member. [Solution] A developing apparatus 4 supplies developer T from a developer storage section 43 onto a developer carrier 41 using a supply rotating body 42, thins the developer on the developer carrier using a layer thickness regulating member 44, develops the latent image on the latent image carrier 1 in a developing region, and recovers the transfer residue toner on the latent image carrier. The supply rotating body contacts the developer carrier to form a supply nip, and has charge reduction means 47, 48 to reduce the charge amount of foreign matter I1 that is transported together with the transfer residue toner on the latent image carrier along a transport path from a charged region where the surface of the latent image carrier is uniformly charged until it is recovered onto the developer carrier in the developing region and reaches the supply nip.

An electrostatic image developing toner set includes a yellow toner including a yellow pigment; a magenta toner including a magenta pigment; a cyan toner including a cyan pigment; a black toner including a black pigment; a first toner that is a dye toner or a transparent toner, the first toner having a crystallization temperature T1 of 80°C or more and 95°C or less; and a second toner that is a dye toner or a transparent toner, the second toner having a crystallization temperature T2 of 60°C or more and 75°C or less.

To provide a belt for electrophotography that continuously has excellent toner cleaning characteristics even in image formation in a high-speed area.SOLUTION: A belt for electrophotography with an endless belt shape has a base layer and a surface layer provided on the base layer. The surface layer includes a (meth)acrylic resin and has holes having openings in an outer surface of the surface layer. When an area having a length of 10 μm in a circumferential direction of the belt for electrophotography and a width equal to the full width of the belt for electrophotography is set in an arbitrary position on the outer surface of the surface layer, at least one opening is present in the area which communicates, inside the surface layer, with an opening present outside the area.SELECTED DRAWING: Figure 1