Abstract:
An image forming apparatus comprises an image bearing member which is able to carry latent image and a reservoir in which liquid developer is stored. The liquid developer is transferred and adhered to the latent image so that the liquid developer develops the latent image. The liquid developer presents liquid state at least when the liquid developer develops the latent image. The image forming apparatus further comprises a developer retainer (being faced with the image bearing member) having fine holes through which the liquid developer is transferred to the image bearing member, and a developer supplier which supplies the liquid developer from the reservoir to the developer retainer. Each of the fine holes has an exit opening through which the liquid developer moves out of the fine hole and moves to the image bearing member. Each of the fine holes has a part in which a cross sectional area thereof increases as a distance from the exit opening decreases.
Abstract:
A method and apparatus for the development of an electrostatic image on a recording surface by supplying liquid developer comprising positively or negatively charged toner particles dispersed in an electrically insulating non-polar carrier liquid to a developing zone where increments of the electrostatic image are succesively developed by attraction or toner particles to a recording layer, e.g., photoconductive coating (3), in a distribution depending on the distribution of charges forming said electrostatic image, wherein the liquid developer is supplied, e.g. with ink-jet (7), to the developing zone so that in course of the period over which the development of the complete electrostatic image takes place, said developer is made available at that zone in a distribution pattern which constitutes a lower resolution version of the electrostatic image to be developed, each increment of said pattern being brought directly opposite the corresponding increment of the electrostatic image.
Abstract:
A process for the ink development of an electrostatic image comprising the steps:(a) forming an electrostatic image on a charge retaining surface,(b) wetting the charge retaining surface with a thin layer of dielectric liquid which is chemically inert toward the surface,(c) inking the charge retaining surface with an electrically conductive liquid ink formulation which is immiscible with the dielectric liquid,(d) inducing at the interface between the ink and the dielectric liquid a charge differential with respect to the electrostatic image on the charge retaining surface, and, when the induced charge density at the dielectric liquid-oil interface exceeds a threshold value,(e) penetrating the dielectric liquid with the complete ink formulation, and(f) wetting the charge retaining surface with the ink formulation.
Abstract:
An apparatus for developing a latent electrostatic image by passing the image close to but out of contact with a surface of a liquid developer at a development zone. The values of the magnitude of the charge of the image, the distance between the image segment and the liquid surface at the development zone, and the physical characteristics of the liquid are such that at the development zone the electrostatic field created by the segment of the image at the zone, with or without the assistance of an external electrostatic field impressed upon the development zone, raises pseudopods from the liquid developer surface which extend toward the carrier on which the electrostatic image is present. The pseudopods and/or droplets separated from the tip of the pseudopods surface under the influence of the electrostatic field created by the image segment, but are opposed by gravity. Where there is no latent image, the voltages, the gap and the physical characteristics of the developing liquid are such that no developing liquid reaches the carrier, so that these uncharged segments of the carrier are not touched by the tips of the spikes or the droplets, and hence, remain dry and not colored by the color of the liquid if the liquid is colored. These dry spots constitute the background against which the developed latent image is seen. Such background, due to the balancing of the factors mentioned, remains in its virgin state and provides an excellent contrast for the colored developed image.
Abstract:
Electrostatographic imaging apparatus including a development apparatus for the liquid development of electrostatic latent images on an imaging surface, the development apparatus comprising first and second developer applicators arranged for successive application of developer liquid to the surface, the first and second applicators having retaining recesses for developer liquid, and the recesses of the first and second applicators being of relatively high and low frequencies, respectively.
Abstract:
A process of producing a liquid image, wherein an insulating material bearing an electrostatic charge pattern detectable at its surface is developed by wetting with a developing liquid according to such charge pattern and wherein in said process developing liquid is brought substantially uniformly in close proximity to or in contact with said material by the use of at least one developing liquid applicator means followed by at least one other means that is capable of removing from the charge-carrying member some of the developing liquid already deposited by the or a said preceding applicator means.
Abstract:
A novel liquid developing system is disclosed which employs a rigid member adapted so that it is resilient when employed in operating contact with another rigid member. The resilient member is normally arcuate in configuration and includes a rigid support member and a flexible arcuate surface spaced apart by a resilient member and a means for tensioning the resilient member so that the spacing tension is reduced in an amount sufficient to allow easy movement of the flexible surface with respect to the resilient member.
Abstract:
An electrostatic printing method for developing an electrostatic latent image on a recording member by first developing the image by the "electrostatic developing" method in which a liquid developer comprising an insulating liquid vehicle and a solid colorant is electrostatically attracted and applied only to the electrostatic latent image, and then further developing the image, by "liquid developing" in which an insulating liquid miscible with the vehicle used in the electrostatic developing step and containing substantially no coloring matter is applied to the image and non-image areas on the recording member, whereby some of the solid colorant attracted to the electrostatic image is charged and migrates to any image portion not developed by the electrostatic developing step.
Abstract:
An electrostatographic imaging method employing polar liquid development comprising developing an electrostatic charge pattern present on an electrostatographic imaging surface by first contacting said imaging surface with a thin dielectric web, developing said electrostatic latent image on said interposed dielectric web with a polar liquid developer and transferring said developer from said dielectric film to a receiver sheet in image configuration.
Abstract:
An apparatus controls the pressure of a doctoring means against an applicator surface to compensate for charges in the ambient temperature. The apparatus comprises a set of jaws which bring the doctoring means to pressure contact with the applicator surface upon closing and a means for limiting the closing of the jaws at lower temperatures to provide doctoring under reduced pressure at lower temperatures.