Abstract: A printing apparatus includes a removable member including a printing unit, a battery that drives the printing unit, a control board that controls the printing unit, and a body unit that holds the removable member, the battery, and the control board. The removable member and the battery are disposed on a straight line extending in a sub-scanning direction perpendicular to a main scanning direction of the body unit. The control board is disposed in the body unit with a side, as a facing side, of the control board being along a height direction of the printing apparatus and facing the removable member and the battery in the main scanning direction.

Abstract: The present invention provides an electron emitting element, comprising: a first electrode; an insulating fine particle layer formed on the first electrode and composed of insulating fine particles; and a second electrode formed on the insulating fine particle layer, wherein the insulating fine particle layer is provided with recesses formed in a surface thereof, the surface facing the second electrode, the recesses each having a depth smaller than a thickness of the insulating fine particle layer, and when a voltage is applied between the first electrode and the second electrode, electrons provided from the first electrode are accelerated in the insulating fine particle layer to be emitted though the second electrode.

Abstract: The present invention provides an electron emitting element, comprising: a first electrode; an insulating fine particle layer formed on the first electrode and composed of insulating fine particles; and a second electrode formed on the insulating fine particle layer, wherein the insulating fine particles are monodisperse fine particles, and when voltage is applied between the first electrode and the second electrode, electrons are discharged from the first electrode into the insulating fine particle layer and accelerated through the insulating fine particle layer to be emitted from the second electrode.

Abstract: The present invention provides an electron emitting element, comprising: a first electrode; an insulating fine particle layer formed on the first electrode and composed of insulating fine particles; and a second electrode formed on the insulating fine particle layer, wherein the insulating fine particle layer is provided with recesses formed in a surface thereof, the surface facing the second electrode, the recesses each having a depth smaller than a thickness of the insulating fine particle layer, and when a voltage is applied between the first electrode and the second electrode, electrons provided from the first electrode are accelerated in the insulating fine particle layer to be emitted though the second electrode.

Abstract: The present invention provides an electron emitting element, comprising: a first electrode; an insulating fine particle layer formed on the first electrode and composed of insulating fine particles; and a second electrode formed on the insulating fine particle layer, wherein the insulating fine particles are monodisperse fine particles, and when voltage is applied between the first electrode and the second electrode, electrons are discharged from the first electrode into the insulating fine particle layer and accelerated through the insulating fine particle layer to be emitted from the second electrode.

Abstract: The present invention provides an electron emitting element, comprising: a first electrode; an insulating fine particle layer formed on the first electrode; and comprising first insulating fine particles and second insulating fine particles larger than the first insulating fine particles, a surface of the insulating fine particle layer having a projection formed from the second insulating fine particles, and a second electrode formed on the insulating fine particle layer, wherein when a voltage is applied between the first electrode and the second electrode, electrons provided from the first electrode are accelerated in the insulating fine particle layer to be emitted from the second electrode via the projection.

Abstract: An electrophotographic photoconductor that is exposed by an exposure light source having a wavelength of 405±20 nm, the electrophotographic photoconductor comprising: a conductive substrate; and at least a charge generation layer and a charge transfer layer stacked in order on the conductive substrate, the charge transfer layer containing, as a charge transfer material, a phenylenediamine compound represented by the following general formula (I): wherein, Ar is an aryl group that may have a substituent, R1, R2 and R3 are a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, independently, k is an integer from 1 to 5 and l and m are an integer from 1 to 4, the charge generation layer containing a gallium phthalocyanine dimer as a charge generation material.

Abstract: An electron emitting element of the present invention includes an electron acceleration layer that includes insulating fine particles but does not include conductive fine particles, the electron acceleration layer being provided between an electrode substrate and a thin-film electrode. This electron emitting element accelerates electrons in the electron acceleration layer and emits the electrons from the thin-film electrode, when a voltage is applied between the electrode substrate and the thin-film electrode. Accordingly, the electron emitting element of the present invention makes dielectric breakdown hard to occur. Further, this electron emitting element is produced easily at low cost and capable of emitting a steady and sufficient amount of electrons.

Abstract: A carrier has a thermosetting silicone resin layer formed of a core particle and a thermosetting silicone resin on the surface of the core particle, and the thermosetting silicone resin layer is formed by subjecting a thermosetting silicone resin to a thermosetting treatment at a temperature lower than the melting point of a charge control agent contained in the thermosetting silicone resin layer, and includes an inner region which contains a positively chargeable charge control agent and an outer region which does not contain any positively chargeable charge control agent. The two-component developer containing the carrier as described above is charged into a developing device in an image forming apparatus to form an image.