Abstract: A rotor includes at least one first permanent magnet and at least one second permanent magnet. The at least one first permanent magnet forms part of an outer peripheral surface of the rotor and is magnetized to have polar anisotropy. The at least one second permanent magnet is adjacent to the at least one first permanent magnet in a circumferential direction of the rotor and has lower magnetic force than magnetic force of the at least one first permanent magnet.

Abstract: An image forming apparatus includes a photosensitive member, a transfer member, a transfer power source, and a control unit. At a start time of a start-up operation at the time of starting an image forming operation, on the surface of the photosensitive member, a first position coincides with a charging position, and a third position coincides with a transfer position. During a period in which an area on the photosensitive member located between the first position and the third position in a rotation direction of the photosensitive member passes the transfer position, the control unit performs control of applying a first voltage having the same polarity as a normal charging polarity of toner to the transfer member by the transfer power source, and, at a predetermined timing, changing a voltage from the first voltage to a second voltage having an absolute value less than that of the first voltage.

Abstract: A rotor includes a rotor core having magnet insertion holes in a number corresponding to a pole number, and a center hole. The rotor core has first slits and ribs alternately arranged in the circumferential direction along a periphery of the center hole, and second slits on an outer side with respect to the first slits in the radial direction. The first slits and the second slits are both equal in number to half or an integer multiple of the pole number. Each second slit is formed to cover the rib from an outer side in the radial direction. Each first slit has a length A1 in the circumferential direction and a width A2 in the radial direction. Each second slit has a length B1 in the circumferential direction and a width B2 in the radial direction. A1>A2, B1>B2, and A1>B1 are satisfied.

Abstract: Provided are an image bearing member; a charging member that charges the image bearing member; an exposure unit that exposes the image bearing member; a developing unit that develops an electrostatic latent image as a developer image by supplying a developer, charged to regular polarity, to the image bearing member; a transfer member that transfers the developer image to a transfer-receiving body; and a collecting member that collects a deposit on the image bearing member downstream of a transfer portion of the image bearing member at which the developer image is transferred to the transfer-receiving body by the transfer member, and upstream of a charging portion of the image bearing member charged by the charging member, in a rotation direction of the image bearing member. After transfer of the developer image to the transfer-receiving body, the developer remaining on the image bearing member is collected by the developing unit.

Abstract: A cartridge attachable to and detachable from an image forming apparatus forming an image on a recording material, the cartridge includes: an image bearing member; a developer container that contains therein a developer; a developing member that is rotatable and carries the developer supplied from the developer container and supplies the developer to the image bearing member; a developer supplying member that is rotatable and provided in the developer container and in contact with the developing member to supply the developer to a surface of the developing member; and a contact member provided in the developer container and in contact with a surface of the developer supplying member, wherein the developer remaining on the image bearing member after image formation is collected to the developing member, and the developer collected to the developing member is collected into the developer container.

Abstract: A rotor includes a rotation shaft, a rotor core, and a permanent magnet. The rotor core includes a shaft fixing part having a shaft insertion hole in which the rotation shaft is inserted, an annular magnet holding part surrounding the shaft fixing part from outside in a radial direction about a central axis of the rotation shaft and being distanced from the shaft fixing part, and a connecting part connecting the shaft fixing part and the magnet holding part to each other. The permanent magnet is mounted in the magnet holding part and forms a first magnetic pole. A portion of the magnet holding part adjacent to the permanent magnet in a circumferential direction forms a second magnetic pole. The connecting part has at least two ribs distanced from each other in the direction of the central axis.

Abstract: A mechanism that enables developer replenishment by a simpler structure and a mechanism that enables more user-friendly developer replenishment are provided. An attachment port to which a developer supply bottle containing a developer stored therein is detachably attachable is disposed in an interior of an image forming apparatus. The developer supply bottle can be attached when the cover is in an open state. According to this image forming apparatus, when the developer supply bottle is attached to the attachment port, the developer inside the developer supply bottle moves into a developer housing chamber by its own weight.

Abstract: An image forming apparatus includes a rotatable image bearing member to bear an electrostatic latent image, a developing container to accommodate developer including toner and to allow new developer to be replenished by a developer replenishing container, and a developer bearing member to develop the electrostatic latent image into a toner image by using the developer in the developing container. A transfer roller transfers the toner image born on the image bearing member onto the recording material, and a controller notifies replenishment information for prompting replenishing the developing container with the new developer by the developer replenishing container. The controller notifies the replenishment information in a state in which an index correlated with a ratio of an amount of paper dust mixed in the developer in the developing container to an amount of the developer in the developing container has not exceeded a preset threshold value of the index.

Abstract: An electric motor includes a rotor and a stator. The rotor includes a rotor core and a plurality of permanent magnets fixed to an outer surface of the rotor core. The stator includes a stator core including a tooth part and a winding wound around the stator core. The electric motor satisfies an expression of 1<t2/t1?8 where t1 is a minimum distance from a center of a front end surface of the tooth part to one permanent magnet of the plurality of permanent magnets and t2 is a distance from an end of the tooth part to the one permanent magnet.

Abstract: A rotor has a shaft, a rotor core, and a position detection magnet. The rotor core is formed of electromagnetic steel sheets and has an annular shape about the shaft. The position detection magnet has an annular shape about the shaft and is attached to one side of the rotor core in an axial direction of the shaft. The position detection magnet has a first end surface facing the rotor core and a second end surface opposite to the first end surface. The position detection magnet has a tapered part at an inner periphery thereof, and the tapered part is inclined so that a distance from the shaft is maximum at the second end surface.

Abstract: A charging member which is driven so that the surface of the charging member has a speed difference from the surface of an image bearing member. In a cleaning operation for cleaning the charging member by transferring toner adhering to the surface of the charging member from the charging member to the image bearing member and collecting the transferred toner with a developing member, a first charging voltage forming a potential difference between the charging member and the image bearing member is applied to the charging member, and then a second charging voltage having the same polarity as that of the first charging voltage and an absolute value greater than that of the first charging voltage is applied. The potential difference is in a direction in which electrostatic force directed from the charging member to the image bearing member acts on the toner charged to normal polarity.

Abstract: A semiconductor device has a first transistor of a first conductivity type and a second transistor of a second conductivity type, the first transistor is arranged in an active region of a semiconductor substrate, and a gate electrode and the active region overlap with each other in a plan view and also have a portion located between the source and the drain of the first transistor of the semiconductor substrate. In the channel width direction, an impurity concentration of the second conductivity type is higher at the end than on the center side of the portion.

Abstract: An electric motor includes a rotor and a stator. The stator includes a first stator core located on a first side in the axial direction, and a second stator core located on a second side. The minimum distance from a rotor core of the rotor to the first stator core in the radial direction is smaller than the minimum distance from the rotor core to the second stator core in the radial direction. Each tooth of the first stator core includes a tooth end portion. The tooth end portion includes a main body extending in the radial direction, and a first portion extending in the circumferential direction, and a second portion projecting from the first portion in the radial direction.

Abstract: A rotor includes a shaft extending in the direction of an axis, and a rotor core including a central hole in which the shaft is inserted. The central hole includes a first central hole, a second central hole, and a third central hole in the direction of the axis. A distance from the axis to an inner circumferential surface of the third central hole is larger than a distance from the axis to an inner circumferential surface of the second central hole. The distance from the axis to the inner circumferential surface of the second central hole is larger than a distance from the axis to an inner circumferential surface of the first central hole.

Abstract: An endoscope including an elongated insertion section; a side observation window that includes a tapered part on a side circumference intersecting in a longitudinal axis direction of the insertion section, a circumferential side surface formed in a cone shape; and a cleaning nozzle that includes an opening through which liquid cleaning the circumferential side surface of the side observation window is ejected. The opening is inclined to direct an ejection direction of the liquid toward a distal end of the tapered part. A center position of the opening part of the cleaning nozzle is provided on a proximal end side with respect to a center position of the side observation window in the longitudinal axis direction.

Abstract: A rotor includes a rotor core including a magnet insertion hole and an opening and a permanent magnet inserted in the magnet insertion hole and forming a first magnetic pole. The rotor satisfies L1<L2, where L1 is a first maximum width of the opening in a direction perpendicular to a radial direction and L2 is a second maximum width of the opening in the radial direction. A distance from the opening to the magnet insertion hole is smallest at a magnetic pole center of the first magnetic pole.

Abstract: An image forming apparatus includes a first display portion configured to display a ratio of an amount of toner accommodated in the developer container to a maximum amount of toner that the developer container is capable of accommodating, and a controller configured to, in a case where a replenishment operation, in which toner is supplied from the replenishment container to the replenishment port, is performed when the second display portion is in the second state, switch the second display portion from the second state to the first state and perform a display processing of displaying, on the first display portion, the ratio corresponding to an amount of toner accommodated in the developer container after the replenishment operation.

Abstract: An image forming apparatus includes a photosensitive member, a transfer member, a transfer power source, and a control unit. At a start time of a start-up operation at the time of starting an image forming operation, on the surface of the photosensitive member, a first position coincides with a charging position, and a third position coincides with a transfer position. During a period in which an area on the photosensitive member located between the first position and the third position in a rotation direction of the photosensitive member passes the transfer position, the control unit performs control of applying a first voltage having the same polarity as a normal charging polarity of toner to the transfer member by the transfer power source, and, at a predetermined timing, changing a voltage from the first voltage to a second voltage having an absolute value less than that of the first voltage.

Abstract: A video processor includes: an image processing section including a front image enhancement processing section configured to perform first enhancement processing on a front image acquired from a front area in a subject by using an endoscope including an insertion portion which is inserted into the subject, and a side image enhancement processing section configured to perform second enhancement processing on a side image acquired from a side area located lateral to the front area by using the endoscope; and a control section configured to individually set an enhancement level of enhancement processing performed by the front image enhancement processing section and an enhancement level of enhancement processing performed by the side image enhancement processing section.

Abstract: A rotor includes a shaft extending in the direction of an axis, and a rotor core including a central hole in which the shaft is inserted. The central hole includes a first central hole, a second central hole, and a third central hole in the direction of the axis. A distance from the axis to an inner circumferential surface of the third central hole is larger than a distance from the axis to an inner circumferential surface of the second central hole. The distance from the axis to the inner circumferential surface of the second central hole is larger than a distance from the axis to an inner circumferential surface of the first central hole.