An image forming apparatus includes a main frame, a plurality of process cartridges, a cartridge-supporting body, a belt, a belt cleaning unit, a waste toner cartridge, and a collective conveying unit. Each drum-cleaning unit collects waste toner on a corresponding photosensitive drum. The cartridge-supporting body supports the process cartridges and is movable between an internal position inside the main frame and an external position outside of the main frame. The belt cleaning unit collects waste toner on the belt. The waste toner cartridge accommodates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit. The collective conveying unit aggregates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit and conveys the aggregated waste toner to the waste toner cartridge.

An imaging unit for an electrophotographic image forming device having positional control features for aligning the imaging unit in a supporting frame in the image forming device. The positional control features include on each end wall, first and second bullet noses and a stop arm positioned between the two bullet noses. The first and second bullet noses engage support or datum surfaces provided in corresponding openings in the frame. The stop arm receives a biasing force that rotates the imaging unit into its final operating position. A latching assembly is provided on one end wall to prevent the imaging unit from ejecting from the frame.

A carrier for electrostatic image development includes magnetic particles having internal pores, and a resin composition disposed in at least some of the internal pores and containing a resin and inorganic particles including at least one selected from the group consisting of silica, alumina, and calcium carbonate.

An image forming apparatus includes a main frame, a plurality of process cartridges, a cartridge-supporting body, a belt, a belt cleaning unit, a waste toner cartridge, and a collective conveying unit. Each drum-cleaning unit collects waste toner on a corresponding photosensitive drum. The cartridge-supporting body supports the process cartridges and is movable between an internal position inside the main frame and an external position outside of the main frame. The belt cleaning unit collects waste toner on the belt. The waste toner cartridge accommodates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit. The collective conveying unit aggregates both waste toner collected from the photosensitive drums by the drum-cleaning units and waste toner collected from the belt by the belt cleaning unit and conveys the aggregated waste toner to the waste toner cartridge.

An electrostatic image developing toner set includes a yellow toner including a yellow pigment; a magenta toner including a magenta pigment; a cyan toner including a cyan pigment; a black toner including a black pigment; a first toner that is a dye toner or a transparent toner, the first toner having a crystallization temperature T1 of 80 C. or more and 95 C. or less; and a second toner that is a dye toner or a transparent toner, the second toner having a crystallization temperature T2 of 60 C. or more and 75 C. or less.

An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer disposed on the conductive substrate, and a photosensitive layer disposed on the undercoat layer, in which an integrated value of an intensity in a period range of 0.01 mm or greater and 0.1 mm or less in a power spectrum obtained by performing fast Fourier transform on a roughness curve of an outer peripheral surface of the conductive substrate in an axial direction is 0.02 or greater and 0.10 or less, and the undercoat layer has a layer thickness of 10 m or greater.

An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer that is provided on the conductive substrate, and a photosensitive layer provided on the undercoat layer, in which the undercoat layer contains a binder resin and an electron transport material having a crystal density of 1.62 g/cm.sup.3 or greater, and a full width at half maximum (FWHM) of a maximum intensity peak in an X-ray diffraction spectrum measured in a thickness direction is 5.0 or less.

An electrophotographic photoreceptor includes a conductive substrate, a charge generation layer provided on the conductive substrate, a charge transport layer provided on the charge generation layer, and a surface protective layer provided on the charge transport layer, in which the charge transport layer has a film thickness of 8 m or greater and 25 m or less, and the surface protective layer is a cured film of a composition, having a film thickness of 10 m or less and containing a resin (X) that has at least one of a unit represented by Formula (X1) or a unit represented by Formula (X2) and a reactive group-containing charge transport material that contains a reactive group and a charge-transporting skeleton in an identical molecule,

##STR00001## in Formula (X1), R.sup.101, R.sup.102, and R.sup.103 each independently represent a hydrogen atom or an alkyl group having 1 or more and 5 or less carbon atoms, L.sup.101 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, O, C(O), C(O)O, an aromatic ring that may have a substituent, or a combination thereof, L.sup.102 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, O, C(O), C(O)O, or a combination thereof, R.sup.104 and R.sup.105 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms, n represents an integer of 0 or greater and 300 or less, R.sup.106, R.sup.107, and R.sup.108 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms or O[Si(R.sup.109)(R.sup.110)O].sub.mSi(R.sup.111)(R.sup.112)(R.sup.113) R.sup.109, R.sup.110, R.sup.111, R.sup.112, and R.sup.113 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms, and m represents an integer of 0 or greater and 20 or less, in Formula (X2), R.sup.201, R.sup.202, and R.sup.203 each independently represent a hydrogen atom or an alkyl group having 1 or more and 5 or less carbon atoms, L.sup.201 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, O, C(O), C(O)O, an aromatic ring that may have a substituent, or a combination thereof, L.sup.202 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, O, C(O), C(O)O, or a combination thereof, and R.sup.204 is an alkyl group having 6 or more and 30 or less carbon atoms.

An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer provided on the conductive substrate and containing a binder resin and an electron transport material represented by General Formula (P), and a photosensitive layer provided on the undercoat layer,

##STR00001## in General Formula (P), R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 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 electrophotographic photoreceptor includes an outermost layer that contains a charge transport material and a binder resin, in which the binder resin includes a polyester resin P.sub.A having an elastic deformation rate X.sub.A of 53.0% or greater and a polycarbonate resin P.sub.B having an elastic deformation rate X.sub.B that is less than the elastic deformation rate X.sub.A of the polyester resin P.sub.A by a range of 5% or greater and 12% or less.