An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer that is provided on the conductive substrate and contains zinc oxide particles and a binder resin, a charge generation layer that is provided on the undercoat layer and contains titanium-containing organic pigment and a binder resin, and a charge transport layer that is provided on the charge generation layer, in which a film thickness of the undercoat layer is 15.0 m or more and 30.0 m or less, in a case where the film thickness of the undercoat layer is 22.0 m or more and 30.0 m or less, each of a proportion of a Ti concentration and a proportion of a Zn concentration with respect to a total of the Ti concentration and the Zn concentration in a region within +500 nm in a film thickness direction from an interface between the undercoat layer and the charge generation layer is 30% or more and 70% or less, and in a case where the film thickness of the undercoat layer is 15.0 m or more and less than 22.0 m, each of a proportion of a Ti concentration and a proportion of a Zn concentration with respect to a total of the Ti concentration and the Zn concentration in a region within +500 nm in a film thickness direction from an interface between the undercoat layer and the charge generation layer is 20% or more and 80% or less.

An image-forming apparatus includes: a main casing; a drawer movable in a first direction between a first position inside the main casing and a second position outside the main casing; process cartridges attachable to and detachable from the drawer; a controller; and a device-side terminal connected to the controller. The process cartridges are arranged in the first direction in an attached state to the drawer. Each process cartridge includes a photosensitive drum, a magnetic roller, a developing container for storing carrier, a conveying member, a toner sensor, a process memory, and a process-side terminal. The toner sensor is configured to output a detection signal corresponding to a concentration of toner in the developing container. The process-side terminal is for both outputting the detection signal of the toner sensor and outputting information about the process cartridge stored in the process memory. The device-side terminal is configured to contact the process-side terminal.

An electrophotographic photoreceptor includes a conductive substrate, and a photosensitive layer disposed on the conductive substrate, in which an outermost surface layer contains a charge transport material, two or more kinds of resins, and a phenolic compound, and RzJIS on an outer peripheral surface is 0.1 nm or more and 100 nm or less.

An image forming apparatus includes a control unit that controls a state of a restricting unit to switch between a restricted state in which a plurality of consumable units are restricted from being removed and an unrestricted state in which the plurality of consumable units are not restricted from being removed. In a first state in which a contract for a service for using the consumable unit of the specific type provided by a service provider is in effect, the control unit sets the restricting unit to the restricted state in a case where all the plurality of consumable units mounted in the image forming apparatus are consumable units of the specific type, and sets the restricting unit to the unrestricted state in a case where at least one of the plurality of consumable units mounted in the image forming apparatus is the normal consumable unit.

An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer that is provided on the conductive substrate and contains an electron transport material and a binder resin, a charge generation layer that is provided on the undercoat layer, and a charge transport layer that is provided on the charge generation layer, in which, in the undercoat layer, a ratio (X1/X2) of a content X1 (% by mass) of the electron transport material in a region within 4% in a thickness direction of the undercoat layer from an interface between the undercoat layer and the charge generation layer to a content X2 (% by mass) of the electron transport material in a region exceeding 4% in the thickness direction of the undercoat layer from the interface between the undercoat layer and the charge generation layer is 0 or 78 or less.

A process cartridge includes a frame having a side surface at a side of the process cartridge. A photosensitive drum is supported by the frame, the photosensitive drum being rotatable about an axis thereof, the photosensitive drum including a first end positioned at the side of the process cartridge and a second end opposite to the first end in a direction of the axis of the photosensitive drum. A projection is positioned coaxial with the photosensitive drum and at the side of the process cartridge, with the projection projecting from the side surface of the frame in the axial direction of the photosensitive drum with at least a tip of the projection being exposed to outside of the process cartridge. A gear is positioned at the side of the process cartridge, with the gear being rotatable about an axis thereof, the gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge, and with a tip of at least one of the exposed teeth facing the axis of the photosensitive drum.

An electrostatic charge image developing green toner contains green toner particles containing a binder resin, an azomethine fluorescent pigment having an emission peak in a wavelength region of 500 nm or more and 550 nm or less in an emission spectrum, and a non-fluorescent pigment having a reflection peak in a wavelength region of 480 nm or more and 540 nm or less in a reflection spectrum, in which a mass-based ratio M2/M1 of a content M2 of the non-fluorescent pigment to a content M1 of the azomethine fluorescent pigment is 0.05 or more and 1.5 or less, and a total content of the azomethine fluorescent pigment and the non-fluorescent pigment with respect to a total amount of the green toner particles is 5% by mass or more and 15% by mass or less.

An electrophotographic photoreceptor includes a conductive substrate, a first undercoat layer that is provided on the conductive substrate, a second undercoat layer that is provided on the first undercoat layer, and a photosensitive layer that is provided on the second undercoat layer, in which the first undercoat layer contains at least one electron transport material selected from the group consisting of a compound represented by Formula (1), a compound represented Formula (2), and a compound represented by Formula (3), and a binder resin, and a content of silica particles in the first undercoat layer is 0% by mass or 5% by mass or less, and the second undercoat layer contains at least one electron transport material selected from the group consisting of the compound represented by Formula (1), the compound represented Formula (2), and the compound represented by Formula (3), silica particles, and a binder resin, and a content of the silica particles in the second undercoat layer is larger than the content of the silica particles in the first undercoat layer.

##STR00001##

In Formula (1), R.sup.11, R.sup.12, R.sup.13, R.sup.14, R.sup.15, R.sup.16, R.sup.17, and R.sup.18 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom, R.sup.11 and R.sup.12, R.sup.12 and R.sup.13, or R.sup.13 and R.sup.14 may be each independently linked to each other to form a ring, and R.sup.15 and R.sup.16, R.sup.16 and R.sup.17, or R.sup.17 and R.sup.18 may be each independently linked to each other to form a ring.

In Formula (2), R.sup.21, R.sup.22, R.sup.23, R.sup.24, R.sup.25, R.sup.26, R.sup.27, and R.sup.28 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom, R.sup.21 and R.sup.22, R.sup.22 and R.sup.23, or R.sup.23 and R.sup.24 may be each independently linked to each other to form a ring, and R.sup.25 and R.sup.26, R.sup.26 and R.sup.27, or R.sup.27 and R.sup.28 may be each independently linked to each other to form a ring.

In Formula (3), R.sup.31, R.sup.32, R.sup.33, R.sup.34, R.sup.35, R.sup.36, R.sup.37, and R.sup.38 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an alkoxycarbonyl group, or a halogen atom.

An electrostatic charge image developing carrier includes magnetic particles and a resin coating layer that coats the magnetic particles, in which the resin coating layer contains inorganic particles, and in a case where an element ratio of metals and metalloids, that constitute the inorganic particles, is analyzed by X-ray photoelectron spectroscopy in a depth direction, and the element ratio at 0 seconds of etching is defined as A and the element ratio at 300 seconds of etching is defined as B, a value of BA is 0.5 atm % or more and 3.0 atm % or less.

A process cartridge includes a frame having a side surface at a side of the process cartridge. A photosensitive drum is supported by the frame, the photosensitive drum being rotatable about an axis thereof, the photosensitive drum including a first end positioned at the side of the process cartridge and a second end opposite to the first end in a direction of the axis of the photosensitive drum. A projection is positioned coaxial with the photosensitive drum and at the side of the process cartridge, with the projection projecting from the side surface of the frame in the axial direction of the photosensitive drum with at least a tip of the projection being exposed to outside of the process cartridge. A gear is positioned at the side of the process cartridge, with the gear being rotatable about an axis thereof, the gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge, and with a tip of at least one of the exposed teeth facing the axis of the photosensitive drum.