Abstract: A developing cartridge and a developing device capable of preventing developer leak which may occur during replacement of a developer containing unit, and an image forming apparatus having the same are provided. The image forming apparatus includes an image forming apparatus body where a transfer path for a printing medium is formed, and a developing device for developing a visible image. The developing device may include, for example, developing cartridge, a developer containing unit, which contains a supply of developer therein, and which is detachably disposed in the developing cartridge to form a developer transfer path fluidly communicating with the developing cartridge, and a shutter unit which closes the developer transfer path when the developer containing unit is removed from the developing cartridge.

Abstract: Provided is an image forming apparatus which includes a developer to develop an image and a developer contact medium of which a surface contacts the developer, wherein asperities with a density of about 4×108 to about 200×108 pcs/cm2 are formed to form roughness on the surface of the developer contact medium.

Abstract: A developing device includes a photosensitive member having a surface on which a visible image is formed and a developing member to feed a developer to the photosensitive member, and an image forming apparatus having the developing device. The photosensitive member includes a developing region, to which the developer is transmitted by the developing member, and a transfer region, from which the developer of the photosensitive member is transmitted to a recording medium. A redistributing unit is disposed between the developing region and the transfer region, to redistribute the developer present on the photosensitive member.

Abstract: A developing apparatus usable with an image forming apparatus includes a developer cartridge having an outlet through which developer is discharged, a developing cartridge, in which the developer cartridge is detachably disposed, has an inlet, through which the developer discharged from the outlet of the developer cartridge enters, and a connecting member connecting the outlet of the developer cartridge and the inlet of the developing cartridge so that the developer is supplied from the developer cartridge to the developing cartridge, wherein through the arrangement of the developer cartridge, the developing cartridge and the connecting member, the flow of developer from the developer cartridge to the developing cartridge is regulated based on the developer pressure in the developing cartridge.

Abstract: A developing cartridge usable with an image forming apparatus includes a housing having a developing member, a developer storing portion storing developer supplied to the developing member, and a mounting portion allowing at least one developer cartridge storing supplementary developer to be detachably mounted. Printing operations can be performed using the developer available in the developer-storing portion even in the absence of a developer cartridge.

Abstract: A toner cartridge, a developing device, and an image forming apparatus, in which a memory is provided in the cartridge to be accessible by an image forming apparatus are disclosed. The image forming apparatus includes a developing device detachably attached to the body the image forming apparatus, and a toner cartridge detachably disposed in the developing cartridge, which includes a memory accessible from a surface of the toner cartridge exposed outside the developing cartridge when the toner cartridge is installed in the developing cartridge.

Abstract: A developing unit includes a developer cartridge containing developer and a developing cartridge with a developing cartridge body comprising a mounting portion and a cover member. The mounting portion accepts the developer cartridge for replenishing developer consumed by the developing cartridge. The cover member closes an opening of the mounting portion when the developer cartridge is not inserted into the mounting portion. When a developing unit is initially constructed, printing is performed using developer contained in the developing unit. A developer cartridge containing developer can be inserted into the developing unit, allowing the supply of developer in the developing unit to be replenished.

Abstract: A developer cartridge includes a cartridge body including a developer discharge port, a remaining developer detecting unit arranged in the proximity to the developer discharge port, and an agitating unit rotatably arranged inside the cartridge body to convey the developer accommodated in the cartridge body toward the developer discharge port. Since the optical sensor provided in the image forming apparatus body is capable of physically measuring an exact amount of remaining sensor of the developer cartridge, a printing error due to erroneous determination of the remaining developer amount can be prevented.

Abstract: Provided is an image forming apparatus which includes a developer to develop an image and a developer contact medium of which a surface contacts the developer, wherein asperities with a density of about 4×108 to about 200×108 pcs/cm2 are formed to form roughness on the surface of the developer contact medium.

Abstract: A transfer unit of an image forming apparatus includes a belt to receive an image developed on a photosensitive medium while rotating in a regular cycle and in contact with an outer circumference of at least one photosensitive medium. A blade arm, which is installed adjacent to the belt, moves to a first position to position a cleaning blade, which is supported by the blade arm, to be in contact with the belt. The cleaning blade is coupled to a pressure unit to bias the cleaning blade towards the belt.

Abstract: A developing device includes a photosensitive member having a surface on which a visible image is formed and a developing member to feed a developer to the photosensitive member, and an image forming apparatus having the developing device. The photosensitive member includes a developing region, to which the developer is transmitted by the developing member, and a transfer region, from which the developer of the photosensitive member is transmitted to a recording medium. A redistributing unit is disposed between the developing region and the transfer region, to redistribute the developer present on the photosensitive member.

Abstract: A developing cartridge usable with an image forming apparatus includes a housing having a developing member, a developer storing portion storing developer supplied to the developing member, and a mounting portion allowing at least one developer cartridge storing supplementary developer to be detachably mounted. Printing operations can be performed using the developer available in the developer-storing portion even in the absence of a developer cartridge.

Abstract: A developing apparatus usable with an image forming apparatus includes a developer cartridge having an outlet through which developer is discharged, a developing cartridge, in which the developer cartridge is detachably disposed, has an inlet, through which the developer discharged from the outlet of the developer cartridge enters, and a connecting member connecting the outlet of the developer cartridge and the inlet of the developing cartridge so that the developer is supplied from the developer cartridge to the developing cartridge, wherein through the arrangement of the developer cartridge, the developing cartridge and the connecting member, the flow of developer from the developer cartridge to the developing cartridge is regulated based on the developer pressure in the developing cartridge.

Abstract: A developing unit includes a developer cartridge containing developer and a developing cartridge with a developing cartridge body comprising a mounting portion and a cover member. The mounting portion accepts the developer cartridge for replenishing developer consumed by the developing cartridge. The cover member closes an opening of the mounting portion when the developer cartridge is not inserted into the mounting portion. When a developing unit is initially constructed, printing is performed using developer contained in the developing unit. A developer cartridge containing developer can be inserted into the developing unit, allowing the supply of developer in the developing unit to be replenished.

Abstract: A developer cartridge includes a cartridge body comprising a developer discharge port, a remaining developer detecting unit arranged in the proximity to the developer discharge port, and an agitating unit rotatably arranged inside the cartridge body to convey the developer accommodated in the cartridge body toward the developer discharge port. Since the optical sensor provided in the image forming apparatus body is capable of physically measuring an exact amount of remaining sensor of the developer cartridge, a printing error due to erroneous determination of the remaining developer amount can be prevented.

Abstract: A toner cartridge, a developing device, and an image forming apparatus, in which a memory is provided in the cartridge to be accessible by an image forming apparatus are disclosed. The image forming apparatus includes a developing device detachably attached to the body the image forming apparatus, and a toner cartridge detachably disposed in the developing cartridge, which includes a memory accessible from a surface of the toner cartridge exposed outside the developing cartridge when the toner cartridge is installed in the developing cartridge.

Abstract: A developing cartridge and a developing device capable of preventing developer leak which may occur during replacement of a developer containing unit, and an image forming apparatus having the same are provided. The image forming apparatus includes an image forming apparatus body where a transfer path for a printing medium is formed, and a developing device for developing a visible image. The developing device may include, for example, developing cartridge, a developer containing unit, which contains a supply of developer therein, and which is detachably disposed in the developing cartridge to form a developer transfer path fluidly communicating with the developing cartridge, and a shutter unit which closes the developer transfer path when the developer containing unit is removed from the developing cartridge.

Abstract: An apparatus to detect the remaining amount of developer in a developing unit is provided. The apparatus includes a light emitting prism and a light receiving prism placed opposite to each other in a developer store space of the developing unit and forming a light emitting path and a light receiving path, respectively. A light emitting element irradiates light through the light emitting prism, and a light receiving element receives a light signal through the light receiving prism. An antistatic agent is coated on a light emitting window of the light emitting prism and a light receiving window of the light receiving prism, respectively, to substantially prevent developer from attaching on the light emitting window and the light receiving window.

Abstract: A belt guide and an image forming apparatus having the same are disclosed. The image forming apparatus includes a belt supported by supporting rollers and circulates endlessly. A belt guide is disposed on contact portions between the belt and each of the supporting rollers to prevent a separation of the belt from the supporting rollers. The belt guide is formed in a multi-step concave-convex shape, e.g., a staircase-like shape or a square wave shape. Accordingly, a contact area between the belt and the supporting roller is maximized, thereby effectively preventing wear, separation and color mis-registration of the belt due to meandering thereof.

Abstract: A transfer unit of an image forming apparatus includes a belt to receive an image developed on a photosensitive medium while rotating in a regular cycle and in contact with an outer circumference of at least one photosensitive medium. A blade arm, which is installed adjacent to the belt, moves to a first position to position a cleaning blade, which is supported by the blade arm, to be in contact with the belt. The cleaning blade is coupled to a pressure unit to bias the cleaning blade towards the belt.