32results about How to "Degrades image formed" patented technology

An image processing device including an image signal reception unit configured to receive an image signal of an image to be processed; a density reduction area detector configured to detect a density reduction area satisfying predetermined image density reduction requirements in the image to be processed based on the image signal; a specific image area detector configured to detect a specific image area satisfying predetermined specific image requirements different from the predetermined image density reduction requirements in the image to be processed based on the image signal; and a density controller configured to reduce density of the density reduction area detected by the density reduction area detector in a non-specific image area other than the specific image area detected by the specific image area detector, and to not reduce density of the density reduction area in the specific image area.

A cartridge detachably mountable to an electrophotographic image forming apparatus main body for forming an image on a recording medium, the apparatus main body having: a main body guide; a restraining unit movable with respect to the main body guide; and a main body abutting portion, the cartridge including: a frame; a guided portion protruded from the frame so as to be guided by the main body guide, and abutting on the restraining unit on the way the cartridge is being mounted in the apparatus main body to be restrained from moving to the downstream side in a mounting direction; and a moving member movable with respect to the frame to abut on the main body abutting portion to be moved to act on the restraining unit to move the restraining unit to an allowable position in which the guided portion is allowed to move to the downstream side.

An image forming apparatus includes an image forming station for forming a toner image on a sheet; an image heating portion including a flexible heating roller and a pressing roller to form a nip, the image heating portion being effective to heat while feeding the sheet, by the nip; a pressing state switching portion for switching a state of the nip between a pressing state and a released state; and a sheet feeding position detector for detecting misalignment of the sheet relative to a feeding reference position with respect to a direction perpendicular to a feeding direction of the sheet; wherein when the sheet feeding position detector detects the misalignment, the pressing state switching portion permits the nip to feed at least one sheet in a state of the misalignment, and then switches the nip to the released state and then switches to the pressing state.

The liquid ejection head includes: a piezoelectric body which generates pressure for ejecting liquid; a pressure chamber which is connected to a nozzle; a common liquid chamber which is arranged across the piezoelectric body from the pressure chamber and has at least five molded walls that are integrally molded from a resin material; groove-shaped wires which include a first wire and a second wire and are formed on at least two of the molded walls of the common liquid chamber; a liquid supply flow channel which is provided in one of the molded walls that is adjacent to the pressure chamber in such a manner that the liquid supply flow channel is connected with the pressure chamber; and an electronic circuit which is arranged on one of the molded walls of the common liquid chamber, wherein the first wire is connected to the piezoelectric body and the second wire is connected to the electronic circuit.

An image forming apparatus including a main assembly; an intermediary transfer unit including an endless intermediary transfer belt, a plurality of rollers including a driving roller for applying a driving force to the intermediary transfer belt and stretching the intermediary transfer belt, and an intermediary transfer frame integrally supporting the rollers; a main assembly rail member, fixed to the main assembly, for guiding the intermediary transfer unit, the main assembly rail member regulating and positioning at least the driving roller and a roller around which the intermediary transfer belt is wound with a wrapping angle not less than 90° in a state that intermediary transfer unit is mounted in the main assembly.

An image processing device including an image signal reception unit configured to receive an image signal of an image to be processed; a density reduction area detector configured to detect a density reduction area satisfying predetermined image density reduction requirements in the image to be processed based on the image signal; a specific image area detector configured to detect a specific image area satisfying predetermined specific image requirements different from the predetermined image density reduction requirements in the image to be processed based on the image signal; and a density controller configured to reduce density of the density reduction area detected by the density reduction area detector in a non-specific image area other than the specific image area detected by the specific image area detector, and to not reduce density of the density reduction area in the specific image area.

An image forming device in which image carrying bodies on which an electrostatic latent image is respectively formed in accordance with for each a plurality of colors are arranged in a tandem manner, in which a charging voltage in which an alternating voltage and a direct voltage are superimposed is applied to charging devices which respectively charge each image carrying body, and in which a color image is formed by sequentially overlapping a toner image of each color formed on each image carrying body on an intermediate transfer medium or a transfer material. A direct voltage power supply for applying a direct voltage to the charging device for each color is independently provided for each charging device for each color, and an alternating voltage power supply for applying an alternating voltage to the charging device for each color is commonly provided to the charging device for each color. A current detecting section for detecting a current which flows between the each image carrying body and the each charging device is provided. A control device is provided which judges that the image carrying body is damaged when a current value detected by the current detecting section is not less than a preliminarily set specified value when a direct voltage is sequentially independently applied to the charging device for each color when leakage of charging voltage is generated.

An image forming apparatus to which a cartridge including an image bearing drum and a frame supporting the image bearing member, the apparatus includes a belt member for transferring a developed image formed on the drum onto a recording material; an opening provided to permit the cartridge to enter an inside of a main assembly; a first guide portion for guiding the cartridge through the opening from a position where a bottom end portion of the drum is below a transfer position where the drum and the belt member contact with each other when the cartridge is mounted; a second guide portion provided downstream of the first guide portion with respect to a mounting direction in which the cartridge is mounted to the main assembly, the second guide portion guiding the cartridge from a position where the bottom end portion of the drum is below the transfer position to a position where the bottom end portion of the drum is above the transfer position; and a third guide portion provided downstream of the second guide portion with respect to the mounting direction, the third guide portion guiding the cartridge from the position where the bottom end portion is above the transfer position to the transfer position.

An imaging device, such as an EEM, includes an electric / magnetic lens used to focus pulsed electrons emitted from an object on to a target plane. Before a pulse of emitted electrons reaches the lens, electrons are spatially separated in dependence on their respective kinetic energies and are then subject to a time varying electric field that keeps the final focal plane constant for a wide variety of different energy electrons. The electric field compensates for variations in the image focal length caused by a spread in kinetic energies, causing the electrons to be focused proximate the target plane, reducing chromatic aberration. The varying electric field may be provided by varying an electric potential at the lens by, for example, varying a voltage supplied to an electrode at the lens. This potential effectively varies the focal strength of the lens in time, in order to compensate for variations in kinetic energies of electrons arriving at the lens, effectively keeping the image plane position constant.

Disclosed an image forming system including: an image forming apparatus to form an image on a sheet conveyed from a feeding section to eject the sheet; and a plurality of finishers each including one or a plurality of ejection trays, which finishers are connected to the image forming apparatus and perform finishing to the sheet ejected from the image forming apparatus, wherein the image forming apparatus includes a control section to determine a sheet feeding interval of the feeding section based on a position of the ejection tray to which a first sheet is ejected and a position of the ejection tray to which a second sheet is ejected, an image-forming order of the second sheet being immediately before an image-forming order of the first sheet.

An image forming device, a process cartridge engageable with the same and a method for firmly positioning the process cartridge in the image forming device. The image forming device includes a main frame and a main frame driving gear, wherein a guide rail is respectively arranged on left and right sides of the inside of the main frame. An installation section is arranged at a tail end of each guide rail and the installation section and guide rail respectively define a reverse hook-shape. Lugs formed at both ends of a housing of the process cartridge are driven by a radial component of driving force of the image forming device to the process cartridge to closely bear against walls of installation sections at the tail ends of the guide rails when the process cartridge is in an operating state in the image forming device.

An image forming device. A direct voltage power supply is independently provided for each charging device for each color, and an alternating voltage power supply is commonly provided to the charging device for each color. A current detecting section detects current which flows between each image carrying body and each charging device. A control device judges that the image carrying body is damaged when a detected current value is not less than a preliminarily set specified value when a direct voltage is sequentially independently applied to the charging device for each color when leakage of charging voltage is generated.

The separation holding member 36 includes a grip portion 36h for detaching the separation holding member 36 from the cartridge B, the grip portion 36h being configured so as to assume a first shape of protruding in a direction of separation from a surface of the cartridge B when the cartridge B mounted with the separation holding member 36 is detached from the apparatus main body A and to assume a second shape in which a gap with the surface of the cartridge B is smaller than in the first shape when the cartridge B mounted with the separation holding member 36 is mounted to the apparatus main body A.

An image forming apparatus has a plurality of developing devices for developing an electrostatic image formed on an image bearing member, a rotary member holding the plurality of developing devices and rotated in a route including a developing position, the rotary member selectively positioning any one of the developing devices at the developing position, each of the plurality of developing devices having a first developer carrying member and a second developer carrying member for carrying a developer thereon and carrying it to the image bearing member, and a holding member holding the first developer carrying member and the second developer carrying member and pivotally movably provided.

An image forming apparatus includes a belt member for transferring a developed image, an opening provided to permit a cartridge including an image bearing drum to enter a main assembly, a first guide portion for guiding the cartridge through the opening from a position where a bottom end portion of the drum is below a transfer position where the drum and the belt member contact each other when the cartridge is mounted, and a second guide portion provided downstream of the first guide portion. The second guide portion guides the cartridge to a position where the bottom end portion of the drum is above the transfer position. In addition, a third guide portion, provided downstream of the second guide portion, guides the cartridge from the position where the bottom end portion is above the transfer position to the transfer position.

A laser scanning optical apparatus wherein a plural number of beams are deflected by one polygon mirror and are scanned on respective corresponding photosensitive drums via a scanning optical system. The scanning optical system has a first scanning lens which transmits all the beams, exclusive second scanning lenses which transmit exclusively the respective beams and plane mirrors for reflecting the beams. The second scanning lenses are located such that at least one of the second scanning lenses is at a distance from the corresponding photosensitive drum on which the beam transmitted by the at least one of the second scanning lenses is scanned and that another second scanning lens is at another distance from the corresponding photosensitive drum on which the beams transmitted by the another second scanning lens is scanned. For example, at least one of the exclusive optical elements is at a distance from the corresponding photosensitive drum, and the other exclusive optical elements are at another distance from the respective corresponding photosensitive drums. Alternatively, the exclusive optical elements are at mutually different distances from the respective corresponding photosensitive drums.

The separation holding member 36 includes a grip portion 36h for detaching the separation holding member 36 from the cartridge B, the grip portion 36h being configured so as to assume a first shape of protruding in a direction of separation from a surface of the cartridge B when the cartridge B mounted with the separation holding member 36 is detached from the apparatus main body A and to assume a second shape in which a gap with the surface of the cartridge B is smaller than in the first shape when the cartridge B mounted with the separation holding member 36 is mounted to the apparatus main body A.

An image forming apparatus includes a photosensitive drum, a charging roller, a transfer roller, and a toner charging brush, wherein the toner charging brush reciprocates in a longitudinal direction of the photosensitive drum. In the image forming apparatus, when a number of rotations per a unit time of the image bearing member is assumed to be “a” and a number of times of reciprocation per unit time of the toner charging brush is assumed to be “b” assuming that R=b / a, R is set to be in a range of 1 / 25≦R≦3. However, R=m / n (m and n are integers of 5 or less) is excluded. Consequently, generation of a periodic attachment pattern appearing on the photosensitive drum is eliminated.

The invention provides an image forming device, a process cartridge engaged with the same and a method for firmly positioning the process cartridge in the image forming device. The image forming device, comprising a main frame and a main frame driving gear, wherein a guide rail is respectively arranged on the left and right sides of the inside of said main frame; an installation section is arranged at the tail end of each guide rail; and said installation section and said guide rail approximately form a barb. Lugs formed at both ends of a housing of the process cartridge are driven by a radial component of driving force of the image forming device to the process cartridge to always closely lean against the walls of the installation sections at the tail ends of the guide rails when the process cartridge is in the operating state in the image forming device.

An image forming apparatus includes an image transfer belt; a first transfer member; a second transfer member opposed to the first transfer member with the belt therebetween; an applying device for applying a voltage to at least one of the first and second transfer members; and a controller for controlling the applying device to apply to the at least one transfer member a voltage having the same polarity as a regular polarity of toner and a voltage of the opposite polarity to the first transfer member in a cleaning operation. The controller changes a number of image formations to be carried out from a cleaning operation to a next cleaning operation depending on the kind of the sheet. The number controlled by the controller is different depending on the kind of the sheets in a continuous printing job.

An image forming apparatus includes a belt member for transferring a developed image formed on an image bearing member onto a recording material, and an opening provided to permit a cartridge including the image bearing member to enter inside of the image forming apparatus. In addition, a first guide portion guides the cartridge through the opening from a position where a bottom end portion of the image bearing member is below, with respect to a vertical direction, a transfer position where the image bearing member and the belt member contact each other when the cartridge is mounted, a second guide portion guides the cartridge from a position where the bottom end portion is below, with respect to the vertical direction, the transfer position to a position where the bottom end portion is above the transfer position, and a third guide portion guides the cartridge from the position where the bottom end portion is above, with respect to the vertical direction, the transfer position to the transfer position.

An image forming device includes a drive transfer device that selectively transmits a driving force of a first drive source to one of liquid feed pumps, a suction part of a maintenance recovery device and an air-vent opening part. The air-vent opening part is arranged to have a maximum driving-force transmission path leading to the drive transfer device among the liquid feed pumps, the suction part and the air-vent opening part. The maintenance recovery device, the drive transfer device and the liquid feed pumps are arranged in order in a sheet transport direction. The suction part of the maintenance recovery device and the drive transfer device are arranged on opposite sides of a cap of the maintenance recovery device in the sheet transport direction.

An image forming apparatus has a plurality of developing devices for developing an electrostatic image formed on an image bearing member, and a rotary member holding the plurality of developing devices and rotated in a route including a developing position, the rotary member selectively positioning any one of the developing devices at the developing position. Each of the plurality of developing devices has a plurality of developer carrying members carrying a developer thereon and carrying the developer to the image bearing member.

An image forming apparatus includes an image transfer belt; a first transfer member; a second transfer member opposed to the first transfer member with the belt therebetween to; an applying device for applying a voltage at least one of the first and second transfer members; and a controller for controlling the applying device to apply to the at least one transfer member a voltage having the same polarity as a regular polarity of toner and a voltage of the opposite a first transfer member cleaning operation. The controller changes a number of image formations to be carried out from a cleaning operation to a next cleaning operation depending on the kind of the sheet. The number controlled by the controller is different depending on the kind of the sheets in a continuous printing job.