Abstract: An image forming apparatus includes: an image carrier in which a latent image is formed; a developing device that transfers toner to the latent image from a developing member opposed to the image carrier, and develops the latent image; a development power supply that applies a development voltage across the image carrier and the developing member; a period detector that detects periodic information on the developing member and the image carrier in a circumferential direction; and a corrector that corrects the development voltage or an exposure amount of the latent image based on the periodic information detected by the period detector. At least one of the developing device and the development power supply is set so that a supply rate of charge of the toner to the latent image in a solid area of an image reaches 80% or higher.

Abstract: A developing device includes: a container for accommodating developer, the container having an exhaust port; and a merging section where airflows directed from the interior of the container to the exhaust port join together.

Abstract: A developing device includes: a container for accommodating developer, the container having an exhaust port; and a merging section where airflows directed from the interior of the container to the exhaust port join together.

Abstract: A developing device includes a developer carrier that opposes an image carrier and rotates while carrying developer on a surface thereof; and a container that supports the developer carrier in a rotatable manner and contains the developer, the developer containing toner, first carrier subjected to frictional charging together with the toner, and second carrier having a diameter greater than a diameter of the first carrier and an electrical resistance lower than an electrical resistance of the first carrier.

Abstract: A developing device includes a developer carrier that opposes an image carrier and rotates while carrying developer on a surface thereof; and a container that supports the developer carrier in a rotatable manner and contains the developer, the developer containing toner, first carrier subjected to frictional charging together with the toner, and second carrier having a diameter greater than a diameter of the first carrier and an electrical resistance lower than an electrical resistance of the first carrier.

Abstract: A developing device includes a developing housing that contains developer; a developer carrier that transports the developer; a layer-thickness regulating member that is provided for an upstream gap between the developer carrier and the developing housing and that regulates a layer thickness of the developer; and a sealing member that is provided for a downstream gap between the developer carrier and the developing housing. The sealing member is fixed to the developing housing at one side and is in contact with the developer on the developer carrier at the other side. The sealing member has cuts extending from a free end of the sealing member by approximately 60% or more of a dimension of the sealing member from the free end to a fixed end in the width direction, and is at an angle of approximately 30° or less with respect to a reference line.

Abstract: A developing device includes a developing housing that contains developer; a developer carrier that transports the developer; a layer-thickness regulating member that is provided for an upstream gap between the developer carrier and the developing housing and that regulates a layer thickness of the developer; and a sealing member that is provided for a downstream gap between the developer carrier and the developing housing. The sealing member is fixed to the developing housing at one side and is in contact with the developer on the developer carrier at the other side. The sealing member has cuts extending from a free end of the sealing member by approximately 60% or more of a dimension of the sealing member from the free end to a fixed end in the width direction, and is at an angle of approximately 30° or less with respect to a reference line.

Abstract: A developing device is provided. A rotating shaft of a first transporting member is positioned exactly below a developer carrier. A second virtual tangent to the first transporting member that extends vertically on a side of the first transporting member opposite an image carrier is farther from the image carrier than a first virtual tangent to the developer carrier that extends vertically on a side of the developer carrier opposite the image carrier. A distance between the two virtual tangents is shorter than a distance between the first virtual tangent and a developer container. A developer guiding member that guides a developer toward a downstream side in a direction of transport by the first transporting member is provided on a downstream side in a direction of rotation of the developer carrier with respect to the image carrier, with a gap provided with respect to the developer carrier.

Abstract: A developing device is provided. A rotating shaft of a first transporting member is positioned exactly below a developer carrier. A second virtual tangent to the first transporting member that extends vertically on a side of the first transporting member opposite an image carrier is farther from the image carrier than a first virtual tangent to the developer carrier that extends vertically on a side of the developer carrier opposite the image carrier. A distance between the two virtual tangents is shorter than a distance between the first virtual tangent and a developer container. A developer guiding member that guides a developer toward a downstream side in a direction of transport by the first transporting member is provided on a downstream side in a direction of rotation of the developer carrier with respect to the image carrier, with a gap provided with respect to the developer carrier.

Abstract: Provided is a developing device including a storage container that stores a developer, a rotating body that supplies the developer to an image holding member in a supply region by being rotated with holding the developer, an inflow portion that is provided with an inflow port placed on a downstream side of the supply region in a rotation direction of the rotating body, and flows air into the storage container, and an outflow portion that is provided with an outflow port and emits air in the storage container from the outflow port, wherein the outflow port and the inflow port are placed to be adjacent to each other.

Abstract: A developing device includes a developer carrier that has a cylindrical shape and that rotates while carrying developer to supply the developer to an image carrier on which an electrostatic latent image is formed, a container that contains the developer carrier, and a discharge-path forming member that is provided along an outer peripheral surface of the developer carrier, that covers a top portion of a path along which the outer peripheral surface moves, the top portion being located at an uppermost position of the path, and that forms a discharge path, through which air is discharged from inside of the container to outside of the container, between the discharge-path forming member and an inner wall surface of the container, the discharge path having an outlet located closer to the developer carrier than the top portion.

Abstract: A developing device includes a developer container, a magnet member, a developer carrier including a rotary member, and a developer transport member, the magnet member including an attracting magnet pole that attracts a developer on the rotary member and a separation magnet pole that releases the developer. The attracting magnet pole is disposed upstream of a line segment connecting the centers of rotation of the rotary member and the transport member in a rotation direction of the rotary member. The magnetic force of the separation magnet pole is about 35 mT or more and about 45 mT or less, and the magnetic force of the attracting magnet pole is about 38 mT or more and about 54 mT or less. The angle formed by the magnet poles with respect to the center of rotation of the rotary member is about 98 degrees or more and about 117 degrees or less.

Abstract: An image forming apparatus includes an image carrier, a developer container, a moving mechanism that moves a toner of a developer to the image carrier, a stirring and transporting member that transports the developer in the developer container to the moving mechanism, a layer thickness regulating member that regulates the layer thickness of the developer held by a developer holder of the moving mechanism, and a movement regulating unit that regulates movement of the developer. An end of the movement regulating unit at a stirring and transporting member side is located at the stirring and transporting member side with respect to a tangent line tangent to the outer circumference of the stirring and transporting member and passing through a position where the density of magnetic flux of an attraction magnetic pole of a magnet member of the moving mechanism on the surface of the developing holder is the highest.

Abstract: A developing device includes a sleeve and a magnet roller having first and second magnetic poles, the second magnetic pole being disposed downstream of the first magnetic pole. A magnetic attraction distribution on the sleeve in a region from the first magnetic pole to the second magnetic pole is such that the magnetic attraction decreases from a position of the first magnetic pole toward the downstream side, a gradient of change in the magnetic attraction decreases in a region downstream of a region in which a gradient of reduction in the magnetic attraction temporarily increases, thereby forming an attraction reduction region in which the magnetic attraction is reduced so that developer cannot be held on the sleeve, and the gradient of change in the magnetic attraction increases in a region downstream of the attraction reduction region so that the magnetic attraction increases to a position of the second magnetic pole.

Abstract: Provided is a developing device including a storage container that stores a developer, a rotating body that supplies the developer to an image holding member in a supply region by being rotated with holding the developer, an inflow portion that is provided with an inflow port placed on a downstream side of the supply region in a rotation direction of the rotating body, and flows air into the storage container, and an outflow portion that is provided with an outflow port and emits air in the storage container from the outflow port, wherein the outflow port and the inflow port are placed to be adjacent to each other.

Abstract: A developer-agitating transporter includes helical blades that helically extend around a rotation shaft, the helical blades being arranged at different positions in a direction perpendicular to a longitudinal direction of the rotation shaft; and a gap portion that divides each helical blade into a first blade portion and a second blade portion, which oppose each other across the gap portion, so that the helical blade is discontinuous in a direction in which the helical blade extends. The gap portion causes the first blade portion and the second blade portion to be arranged at a certain angular interval in a circumferential direction of the rotation shaft, and at least one surface of adjacent ones of the helical blades that are adjacent in the circumferential direction of the rotation shaft has a sloped area that is sloped at an angle that changes with respect to an axial direction of the rotation shaft.

Abstract: A developing device includes a developer-carrying member and a developer control member, a supply member, and a rotating member that are disposed opposite the developer-carrying member. The developer-carrying member accommodates a magnetic source that generates a magnetic force for carrying a developer containing magnetic particles on an outer surface thereof. The developer control member controls the thickness of a layer of the developer carried on the outer surface of the developer-carrying member. The supply member rotates to transport the developer in a rotation axis direction thereof and to supply the developer to the developer-carrying member. The rotating member is disposed at a position where the rotating member is submerged in the developer between the developer control member and the supply member and rotates to supply the developer from between the developer control member and the supply member to the supply member.

Abstract: A developing device includes a developer carrier that has a cylindrical shape and that rotates while carrying developer to supply the developer to an image carrier on which an electrostatic latent image is formed, a container that contains the developer carrier, and a discharge-path forming member that is provided along an outer peripheral surface of the developer carrier, that covers a top portion of a path along which the outer peripheral surface moves, the top portion being located at an uppermost position of the path, and that forms a discharge path, through which air is discharged from inside of the container to outside of the container, between the discharge-path forming member and an inner wall surface of the container, the discharge path having an outlet located closer to the developer carrier than the top portion.

Abstract: An image forming apparatus includes an image carrier, a developer container, a moving mechanism that moves a toner of a developer to the image carrier, a stirring and transporting member that transports the developer in the developer container to the moving mechanism, a layer thickness regulating member that regulates the layer thickness of the developer held by a developer holder of the moving mechanism, and a movement regulating unit that regulates movement of the developer. An end of the movement regulating unit at a stirring and transporting member side is located at the stirring and transporting member side with respect to a tangent line tangent to the outer circumference of the stirring and transporting member and passing through a position where the density of magnetic flux of an attraction magnetic pole of a magnet member of the moving mechanism on the surface of the developing holder is the highest.

Abstract: A developing device includes a sleeve and a magnet roller having first and second magnetic poles, the second magnetic pole being disposed downstream of the first magnetic pole. A magnetic attraction distribution on the sleeve in a region from the first magnetic pole to the second magnetic pole is such that the magnetic attraction decreases from a position of the first magnetic pole toward the downstream side, a gradient of change in the magnetic attraction decreases in a region downstream of a region in which a gradient of reduction in the magnetic attraction temporarily increases, thereby forming an attraction reduction region in which the magnetic attraction is reduced so that developer cannot be held on the sleeve, and the gradient of change in the magnetic attraction increases in a region downstream of the attraction reduction region so that the magnetic attraction increases to a position of the second magnetic pole.