A charging member includes a support, a conductive elastic layer disposed on the support, and a surface layer disposed on the conductive elastic layer. Domains with current values of 2.5 pA or more have an average size of about 300 nm or less in a binary image created using a current value of 2.5 pA as a threshold from current measured by contacting a conical probe having a tip diameter of 20 nm with an outer surface of the surface layer and applying a voltage of 3 V between the conical probe and the support while moving the conical probe.

A developing device includes a frame, a cylindrical developer carrying member rotatably supported by the frame and configured to carry a developer containing toner particles, and a regulating member fixed to the frame at one end thereof and including a contact portion which contacts the developer carrying member at the other end of the regulating member and which forms a contact nip between the regulating member and the developer carrying member. When a position of the contact portion where a maximum of a pressure distribution of the contact portion to the developer carrying member with respect to a rotational direction of the developer carrying member is indicated is a reference position, the contact portion includes a first surface portion positioned upstream of the reference position and a second surface portion positioned downstream of the reference position with respect to the rotational direction.

A cartridge configured to be attachable to an apparatus main body of an image forming apparatus includes a first unit including a photosensitive drum, a second unit attached to the first unit and including a developing roller, and a second frame member including a toner storage portion and including a toner reception port, the toner storage portion including a first end portion and a second end portion in a rotational axis direction of the photosensitive drum, the toner reception port provided in the first end portion, a toner container configured to be attachable to the second unit, the toner container including a toner discharge port configured to discharge the toner to the toner storage portion through the toner reception port, and a memory, the memory provided in an end portion of the cartridge on the same side as the second end portion of the toner storage portion.

A process cartridge includes a developing cartridge having a developing roller; a drum cartridge having a photosensitive drum; and a first end cover and a second end cover The developing cartridge is rotatably supported on the first end cover and the second end cover A separation force receiving member is mounted at developing cartridge the separation force receiving member includes a force-receiving portion, a force transmission portion and a sliding guide portion; the force-receiving portion is used for receiving an acting force that makes the developing cartridge rotate to the separation position; the sliding guide portion and the first end cover are arranged in a manner of being able to slide relative to each other; and when the separation force receiving member slides relative to the first end covert, the force transmission portion synchronously drives the developing cartridge to rotate.

A conductive member includes: a conductive base material; and a silica glass layer disposed on an outermost surface on an outer peripheral surface of the conductive base material.

An image forming apparatus includes: a main body casing having an opening; a cover movable between a closing position to close the opening and an opening position to open the opening; and a process cartridge detachably attachable to the main body casing through the opening while the cover is at the opening position. The process cartridge includes: a photosensitive drum; a developing device; a toner receiving part; and a toner conveying part. The toner receiving part has a first end portion and a second end portion. The first end portion has a receiving opening for receiving toner. When the cover is at the closing position and the process cartridge is in the attached state, the first end portion is outside the main body casing while the second end portion is inside the main body casing. The toner conveying part conveys toner in the toner receiving part to the developing device.

A cleaning blade includes a contact part coming into contact with a member to be cleaned, the contact part being constituted by a member containing polyurethane rubber produced by polymerizing at least a polyol component and a polyisocyanate component. The ratio (M100/Re) of 100% modulus (M100 [MPa]) to rebound resilience coefficient (Re [%]) of the member is 0.25 or more. The rebound resilience coefficient (Re [%]) of the member is less than 25%. The tensile stress at 23° C. and 200% strain of the member is 15 MPa or more.

An image forming apparatus includes a photosensitive drum, a developing device configured to supply toner onto the photosensitive drum, a transfer device configured to transfer the toner supplied onto the photosensitive drum onto a sheet, a spraying device configured to spray a fixing liquid toward the sheet onto which the toner has been transferred, the spraying device including a housing configured to accommodate the fixing liquid and nozzles configured to spray the fixing liquid inside the housing, and a collecting device configured to collect the fixing liquid sprayed from the nozzles and did not adhere to the sheet. The collecting device includes a collection tray configured to accommodate the fixing liquid, a collection pipe connected to the collection tray and configured to allow the fixing liquid in the collection tray to pass therethrough, and a collection pump configured to send the fixing liquid in the collection pipe toward the housing.

An electrophotographic roller includes: a mandrel and an elastic layer on the mandrel, and having a crown shape in which a diameter decreases from a central position O in a longitudinal direction of the mandrel toward an end portion. When a position of the end portion in the longitudinal direction of the elastic layer is defined as X2, a position between the O and the X2 is defined as Xl, a distance between the O and the X1 is defined as L1, and a distance between the X1 and the X2 is defined as L2, L1=0.6×(L1+L2). When outer diameters of the electrophotographic roller at O, X1 and X2 are defined as Do, DX1 and DX2, respectively, and Z1=(Do−DX1)/2 and Z2=(DX1−DX2)/2 are defined, Z1, Z2, L1 and L2 satisfy (Z2/L2)<1.931×(Z1/L1).

A drum cartridge includes: a photosensitive drum rotatable about an axis extending in a first direction; a first drum frame to which a developing cartridge is attachable; and a second drum frame having an outer surface; and a memory having an electrical contact surface. The first drum frame is at one end portion of the drum cartridge in a second direction and the second drum frame is at another end portion of the drum cartridge in the second direction. The electrical contact surface is positioned at the outer surface of the second drum frame and is movable in a predetermined direction relative to the second drum frame.