Abstract: A developing device and an image forming apparatus which can form a printing image having high resolution and a high quality level, while resolving various problems resulted from the use of small particle size toner particles are provided. The developing device includes a toner constituted of resin base particles containing a coloring agent and a binder resin, and silicone oil and/or fluoro oil added to the resin base particles, a toner receiving portion for receiving the toner, and a developing roller having an outer peripheral surface and an irregularity section for carrying the toner, the irregularity section formed on the outer peripheral surface and including a plurality of depression portions and/or protrusion portions provided regularly and uniformly, wherein an average particle size of the resin base particles in volume basis is in the range of 2 to 4 ?m, and an added amount of the silicone oil and/or fluoro oil to the resin base particles is in the range of 0.05 to 2 mass %.

Abstract: An image forming apparatus includes a first image carrier that carries a first latent image. A first charging section charges the first image carrier. A first exposure section exposes the first image carrier charged by the first charging section. A first developing section develops the first latent image formed on the first image carrier in the first exposure section using a first liquid developer containing a carrier and first toner particles. A first primary transfer section transfers a first image developed in the first developing section onto a transfer medium. A second image carrier carries a second latent image. A second charging section charges the second image carrier. A second exposure section exposes the second image carrier charged by the second charging section.

Abstract: An exposure head, includes: a substrate that is provided with a first light emitting element, a second light emitting element that is arranged at one side of the first light emitting element in a first direction and a third light emitting element that is arranged at the one side of the second light emitting element in the first direction, the first light emitting element and the second light emitting element being arranged at a first distance from each other in the first direction, the second light emitting element and the third light emitting element being arranged at a second distance, which is different from the first distance, from each other in the first direction; and an imaging optical system that images light from the first, the second and the third light emitting elements.

Abstract: A liquid developer includes an insulation liquid containing a fatty acid monoester, and toner particles comprised of a polyester resin. By using the liquid developer, it is possible to provide superior fixing characteristic of toner particles to a recording medium. An image forming apparatus that can suitably use such a liquid developer is also provided.

Abstract: An image-forming device includes an image carrier belt, a roller, a transfer material transporting member, and a transfer roller. The image carrier belt carries an image. The transfer material transporting member transports a transfer material. The transfer roller transfers the image to the transfer material at a nip. The transfer roller includes a concaved portion formed on a peripheral surface thereof and a transfer material gripping portion that grips the transfer material in the concaved portion. The transfer roller is in contact with the roller via the image carrier belt. A first interaxial distance between a rotation axis of the transfer roller and a rotation axis of the roller as the transfer material is gripped is larger than a second interaxial distance between the rotation axis of the transfer roller and the rotation axis of the roller as the image is being transferred onto the transfer material at the nip.

Abstract: An image forming apparatus comprising: an image carrier that carries an image; a charging section that electrically charges the image carrier; an exposure section that forms a latent image on the image carrier electrically charged by the charging section; a development section that develops the latent image formed by the exposure section on the image carrier by means of a liquid developer; a primary transfer section that transfers a image developed by the development section onto a transfer medium; a secondary transfer section that transfers a image transferred onto the transfer medium further onto a recording medium by pressing the transfer medium; and a variable transfer pressure application section that applies transfer pressure of a first level or of a second level at the secondary transfer section.

Abstract: A control method and an image forming apparatus. The apparatus includes a latent image carrier; a development apparatus for developing a liquid developer containing a toner, a carrier liquid and a dispersant soluble in the carrier liquid therein on the latent image carrier; an intermediate transfer medium to which a developer image developed on the latent image carrier is transferred; a transfer apparatus for transferring the developer image on the intermediate transfer medium to a transfer material; and a dispersant collecting liquid application unit for applying a dispersant collecting liquid on the intermediate transfer medium. The method includes performing the control such that after finishing of transfer of the developer image onto intermediate transfer medium, application of the dispersant collecting liquid on the intermediate transfer medium is started by the dispersant collecting liquid application unit.

Abstract: A liquid measuring device includes a floating member that is moved in accordance with a liquid surface, a first magnetic field generator that is disposed in the floating member and positions its north (N) pole to face a first direction, a second magnetic field generator that is disposed in the floating member to be spaced apart from the first magnetic field generator and positions its south (S) pole to face the first direction, and a plurality of proportional output-type hole elements that detect magnetic fields generated by the first magnetic field generator and the second magnetic field generator in positions facing the first direction.

Abstract: An exposure head includes a light emitting element and a imaging optical system having a first region and a second region and contrived such that a slope of a long dimension of a spot diagram formed by light emitted from the light emitting element that passes through the first region is different from a slope of a long dimension of a spot diagram formed by light emitted from the light emitting element that passes through the second region.

Abstract: A density measuring device includes a moving member that can be moved in a liquid, a light emitting member and a light receiving member that receives light emitted by the light emitting member. A gap part in which the moving member is disposed in a path of light emitted from the light emitting member can be moved. A density measuring unit measures the density of the liquid based on the result of output of the light receiving member for a case where the moving member is located in the path of light emitted from the light emitting member and a case where the moving member is not located in the path of light emitted from the light emitting member.

Abstract: An image forming apparatus includes an image carrier that is electrically charged and exposed to light to form a latent image that is developed by liquid developer. A first squeezing roller that is held in contact with the image carrier carrying a developed image bears bias voltage Vs1. A second squeezing roller that is held in contact with the image carrier squeezed by the first squeezing roller bears bias voltage Vs2. The image is transferred to a transfer member that is held in contact with the image carrier squeezed by the second squeezing roller. The absolute values of the bias voltages Vs1 and Vs2 have a relationship of |Vs1|>|Vs2|.

Abstract: A method of measuring density includes detecting movement of a moving member in a light path of light emitted from a light emitting member, measuring an output of a light receiving member for a case where the moving member is moved in the light path, as a first output, detecting that the moving member is not in the light path, measuring an output of the light receiving member for a case where the moving member is not in the light path, as a second output, and calculating density based on the first output and the second output.

Abstract: A lens array includes: a lens array substrate having a light transmissive property; a first lens disposed on the lens array substrate; and a second lens disposed on the lens array substrate in a first direction from the first lens and different from the first lens in peripheral shape.

Abstract: A line head, includes: a microlens array in which a plurality of microlenses having a magnification whose absolute value is below 1 are arranged in a main scanning direction of a surface-to-be-scanned, and a plurality of luminous element groups which are arranged in a one-to-one correspondence with the respective plurality of microlenses, wherein in each of the plurality of luminous element groups, a plurality of luminous elements are arranged at mutually different main-scanning-direction positions in the main scanning direction, the plurality of luminous elements are respectively caused to emit lights at timings in conformity with a movement of the surface-to-be-scanned in a sub scanning direction, and light beams emitted from the plurality of luminous elements are imaged on the surface-to-be-scanned at mutually different main-scanning-direction positions in the main scanning direction to form a plurality of spots side by side on the surface-to-be-scanned in the main scanning direction, and in each of the pl

Abstract: A liquid developer collecting system. A developing unit has a developing roller. A developing roller cleaning unit collects liquid developer on the developing roller. A concentration control unit stores liquid developer collected by the developing roller cleaning unit and controls the concentration of the liquid developer. A first feed unit feeds the liquid developer in the concentration control unit to the developing unit. A second feed unit feeds the liquid developer in the concentration control unit. A developer storage unit stores the liquid developer fed by the second feed unit.

Abstract: Provided is an image forming apparatus including: a latent image carrier, on which a latent image is formed; an exposure head that includes a first light-emitting element and a second light-emitting element that is disposed in a direction in which the latent image container corresponding to the first light-emitting element is moved; and a control unit that changes over and performs a first latent image forming operation, in which the latent image is formed on the latent image container by using the first light-emitting element, and a second latent image forming operation, in which the latent image is formed on the latent image container by using the second light-emitting element, wherein the control unit controls a first light emission timing of the first light-emitting element in the first latent image forming operation and a second light emission timing of the second light-emitting element in the second latent image forming operation to be different from each other.

Abstract: The invention provides an image forming apparatus and an image forming method capable of smoothly and reasonably conducting image formation in case of using a lens (lenses) of which optical magnification is minus. An image forming apparatus of the invention comprises: a line head having lenses of which optical magnification is minus and a light emitter array in which a plurality of light emitting elements are aligned. The lenses are plural in an axial direction (main scanning direction) of an image carrier and a direction (sub scanning direction) perpendicular to the axial direction. A light emitter block composed of “m×n” (in number) light emitting elements is disposed relative to each lens. The “m×n” light emitting elements comprises “n” (in number) light emitting element lines arranged in the direction perpendicular to the axial direction and each light emitting element line includes “m” (in number) light emitting elements aligned in the axial direction.

Abstract: A line head, includes: a plurality of luminous elements grouped into a plurality of luminous element groups; and a lens array which includes a plurality of lenses each of which faces the luminous element group, focuses light beams emitted from the luminous element group on an image plane, and accordingly forms a spot group, wherein the plurality of luminous element groups are arrayed in M×N in a first direction and in a second direction which are different from each other, where M and N are integers equal to or greater than two, and spot groups adjacent to each other in a direction corresponding to the first direction are so formed on the image plane as to partly overlap in a direction corresponding to the second direction.

Abstract: An exposing device includes a light-emitting element array including plural light-emitting elements disposed in a first direction and a second direction orthogonal to or substantially orthogonal to the first direction, a lens array including plural lenses that focus lights from the light-emitting elements, a supporting member that supports the light-emitting element array and the lens array, and an exposure-position adjusting mechanism including a rotation adjusting unit that rotates the supporting member around or substantially around an axis in the first direction.

Abstract: An image forming apparatus includes a latent image carrier on which a latent image is formed, a developer carrier being in contact with the latent image carrier and configured to develop the latent image by using a liquid developer that contains toner and a carrier liquid, an image carrier belt being in contact with the latent image carrier, where the latent image carrier is configured to transfer the latent image onto an area of the image carrier belt, a transfer roller including a concave section on a circumferential surface thereof and a sheet member being configured on a part of the circumferential surface other than where the concave section is wherein the transfer roller is configured to transfer the latent image onto a transfer material, and a control unit being configured to control the area of the image carrier belt being in contact with the sheet member via the transfer material.