Abstract:
A developing method of a liquid type electrophotographic image forming device includes forming an image area corresponding to an electrostatic latent image by scanning light onto a surface of a photosensitive drum that is charged to a predetermined electric potential, attaching a developer on a surface of a developing roller by applying a first bias voltage to a deposit roller and a second bias voltage to the developing roller, developing the image area on the photosensitive drum using the developer attached to the developing roller, and turning off the second and first bias voltages applied to the developing roller and the deposit roller, respectively, when a non-image area of the photosensitive drum contacts the developing roller.
Abstract:
A liquid electrophotographic image forming apparatus using an ink developing solution having a high concentration where a non-volatile carrier is used as a dispersion solvent includes a photosensitive body, a charge unit increasing a potential of the photosensitive body to a charge potential, an exposure unit projecting a beam onto the photosensitive body and forming a latent electrostatic image, a developing solution supply unit supplying a developing solution to the photosensitive body, the developing solution having a high concentration where a non-volatile carrier is used as a dispersion solvent, a developing unit receiving the developing solution having the high concentration to form a developing film having the high concentration and to develop the latent electrostatic image, a transfer unit contacting the photosensitive body and moving the developed image to a recording medium, and a fixing unit fixing the transferred image in the recording medium at a temperature lower than a flash point of the non-volatile carrier. By using the non-volatile developing solution having the high concentration, a smell generating due to vapor of a carrier can be prevented, and an image forming apparatus having a simple structure can be provided.
Abstract:
An image forming method and an image forming apparatus achieve a high developing speed and high transferring efficiency. The method forms a latent image on the surface of an image carrier that repels a coloring liquid, attaches an affinity agent (containing fine silica grains) that has affinity for the coloring liquid, onto the latent image with the electrostatic force, and attaches the coloring liquid onto the affinity agent on the latent image, to visualize the latent image. The method efficiently transfers the visualized image having the affinity agent to a recording medium, to provide a fixed image.
Abstract:
A toner for electrographic printing includes a liquid carrier and a release agent added to the carrier to reduce the amount of carrier leaving the developer section, thus allowing operation at higher speeds and reducing the time and energy required for carrier removal in subsequent sections. An imaging system, or unit of an imaging system, and a method of imaging employ an imaging member such as a belt to form a liquid-toned image, to condition the image, and to transfer it to a print-receiving medium. The member moves through several sections, and transports liquid toner out of an image-developing section. In a preferred embodiment the release agent wets the imaging member, and has a higher boiling point than the carrier and a lower surface tension, though its viscosity may be higher. The release agent reduces carrier entrainment, and coats the imaging member, also enhancing transfer of the final print image. It may also counteract aging characteristics of the imaging member.
Abstract:
A cryogenic liquid, particularly liquid nitrogen, is used as a non-conductive fluid medium for freezing paper and as the liquid toner for electrostatic imaging. A web or sheet of paper is frozen using the cryogenic liquid to provide a dielectric surface for charged image areas to adhere to. The cryogenic liquid based toner carrier is particularly suitable for use in printing processes wherein a latent charge image is developed.
Abstract:
A liquid developer for developing an electrostatic latent image having a carrier fluid and electrically charged toner particles dispersed therein, wherein the liquid developer satisfies the following relationship: 25.0.gtoreq.V.sub.0 /.DELTA.V.sub.10 .gtoreq.1.5 wherein V.sub.0 denotes surface potential of a toner particle layer electrically deposited on a conductive substrate by applying bias voltage between the substrate and an electrode confronting with the substrate, and .DELTA.V.sub.10 denotes change of the surface potential decaying for 10 seconds after shutting off the bias voltage.
Abstract:
An electrophotographic printing plate precursor having satisfactory mechanical strength and water-resistance and suitable to the direct electrical supply system, and a method for development thereof are disclosed.The electrophotographic printing plate precursor comprises an electrically conductive support having thereon a photoconductive layer and a back layer, the back layer being provided on the surface of the support opposite to the photoconductive layer, wherein the back layer comprises at least an outermost layer having a surface resistivity of from 1.times.10.sup.10 to 1.times.10.sup.14 .OMEGA. and an inner layer having a surface resistivity of less than 1.times.10.sup.10 .OMEGA..
Abstract:
Disclosed are marking materials containing retroreflective fillers and processes for the use thereof. In one embodiment, images containing retroreflective fillers are generated on paper by any suitable means, such as electrostatic imaging and development with either dry or liquid developers, ink jet printing, strip-out development processes, or the like, and the images thus generated are used to control a document reproduction system. In another embodiment, images containing retroreflective fillers are generated on a movable part in an imaging apparatus, such as an imaging member, an intermediate transfer member, or the like, by any suitable means, and the images thus generated are used to impart information regarding the relative position of the movable part with respect to the copier or printer containing the movable part.
Abstract:
A wet-type image formation apparatus comprising a latent electrostatic image formation unit capable of forming on a latent-electrostatic-image-bearable photoconductive member a latent electrostatic image corresponding to an original image; and a wet-type development unit capable of developing the latent electrostatic image into a visible toner image with a liquid developer composed of (i) a carrier liquid comprising a petroleum aliphatic hydrocarbon and a silicone oil with a siloxane structure, and (ii) toner particles comprising a coloring agent and a binder resin, which are dispersed in the above-mentioned carrier liquid.
Abstract:
To provide for adhesion of toner particles on a latent image on a ferroelectric material substrate, the toner is so constituted that, upon being transported in close proximity to the ferroelectric substrate, the toner will shape itself into a wave to form a hydraulic meniscus, so that the toner will be adhered by hydraulic meniscus toning. The toner must have low electrical conductivity and is so formulated that particles are kept as discrete entities without interconnection to each other by mechanical or electrical binding. The toner materials can be acrylics, acrylic copolymers, polyethylene, polyethylene vinylacetate copolymers; suitable solvents are aliphatic solvent soluble rosin, rosin esters, rosin ester derivatives, phthalate esters and abietic acid esters; the thermoplastic polymer should be soluble in the dispersant between about 90.degree. C. to 100.degree. C., but insoluble at ambient temperature, and the plasticizer is soluble in the dispersant at both elevated and ambient temperature.