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7068967 |
Developing apparatus with separable multiple developer layers and image forming apparatus incorporating same
A developing apparatus including a developer container which contains a first developer having a first charging polarity and a second developer having a second charging polarity opposite to the...
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6556229 |
Electrophotographic apparatus having a fringe development preventing mechanism
In an electrophotographic apparatus, regions having at least three different potential levels Vc, Vw, and Vr are formed on a photosensitive member by using an exposing device, and developing...
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6487384 |
Image forming electrophotography apparatus and magnetic developing unit
In an image forming apparatus for charging a photosensitive body, changing the light exposure amount in at least three levels at exposure to light, thereby forming an electrostatic image made up of...
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6201595 |
Modular electrophotographic color printer
An electrophotographic color printer includes a photoconductor and a printing unit for producing a toner image on the photoconductor. The printing unit is removably provided in a receptacle in the...
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6117602 |
Electrostatic printing method and apparatus having enhanced image resolution characteristics
A method and apparatus for enhancing image resolution characteristics of an electrostatographic printing device use toners of opposite polarity to generate a toner image.
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6047155 |
Color printing machine having AC pretransfer toner treatment
A color electrophotographic printer that prepares a composite toner image for transfer by exposing an image area containing the composite toner image to an erase lamp and then running the composite...
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5999783 |
Multiple charging of a toner image for transfer
An electrophotographic machine has a photoreceptive member supporting a composite color toner image formed of multiple layers of different colored toners. The composite toner image is pre-transfer...
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5837408 |
Xerocolography tandem architectures for high speed color printing
Full process color imaging is provided with the use of two xerocolography engines in tandem. Each of the two xerocolography engines is capable of creating three perfectly registered latent images...
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5809382 |
DAD, DAD, DAD single-pass color printing
A method for and apparatus for creating partial gamut color images in a single pass. A plurality of latent discharged area images are formed using a single exposure. A first discharged area image...
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5748218 |
Method for forming toner images with two distinct toners
An image forming method which forms a two color toner image or an image made up of two types of toners of the same color includes forming a first image with discharged area development (DAD) and a...
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5713064 |
Method and apparatus for forming toner images with two distinct toners
The scavenging of a first toner into a second toning station in a DAD-CAD or CAD-DAD process can be reduced by allowing scavenged toner to deposit in the background of single color images. The...
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5604569 |
Image forming method exerting joule heat on an irradiated portion of a photoconductive layer, and an apparatus used for such a method
An image-forming method using a latent-image forming body which consists of a transparent electrode layer, a photoconductive layer, an electrode layer and a pyroelectric-material layer made of a...
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5550626 |
Image forming device for creating a color image having pixel elements of different thicknesses
An electrophotographic color printer exposes a photosensitive body to form an exposure pattern thereon. Toner material of two different colors is then applied to the exposure pattern by developers....
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5532801 |
Image forming method superposing first and second developing operations on an image bearing member
An image forming method includes forming a first electrostatic image on an image bearing member; developing with developer carried on a developer carrying member the first image formed in the first...
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5406313 |
Color image forming apparatus and method
A first negative or positive latent electrostatic image is formed on a latent image bearing body with a first writing device, and developed with a monochromatic toner. A second latent image of the...
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5339135 |
Charged area (CAD) image loss control in a tri-level imaging apparatus
A pair of Electronic Voltmeters (ESV) are utilized to control the photoreceptor charging voltage in a Tri-Level imaging apparatus. One of the ESVs is used to control the voltage increases of a...
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5337136 |
Tandem trilevel process color printer
A tandem tri-level architecture. Three tri-level engines are arranged in a tandem configuration. Each engine uses one of the three primary colors plus one other color. Spot by spot, two color...
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5305070 |
Color select development and system application
Color image creation using tri-level images wherein the image color is user selectable. Selection of a desired color establishes the voltage bias of a plurality of developer structures which, in...
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5291243 |
System for electronically printing plural-color tamper-resistant documents
A system for printing security documents which have copy detection or tamper resistance in plural colors with a single pass electronic printer printing an integrated image controlled by an image...
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5241359 |
Biasing switching between tri-level and bi-level development
Image creation apparatus operable in a tri-level highlight color imaging or a black monochrome mode. The developer structures are biased in the tri-level mode using a chopped DC bias while in the...
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5241356 |
Method and apparatus for minimizing the voltage difference between a developed electrostatic image area and a latent electrostaic non-developed image
In a multi-color imaging apparatus, the voltage differential between developed and undeveloped areas of a charge retentive surface is reduced for precluding edge effect development. The developed...
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5241358 |
Biasing scheme for improving latitudes in the tri-level xerographic process
The operating latitude of the tri-level xerographic process is improved by replacing the standard DC bias that is applied to one or both of the developer housings in conventional tri-level imaging...
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5223906 |
Four color toner single pass color printing system using two tri-level xerographic units
A four color toner single pass color printing system consists generally of a raster output scanner (ROS) optical system and two tri-level xerographic units in tandem. Only two of the three...
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5223897 |
Tri-level imaging apparatus using different electrostatic targets for cycle up and runtime
Two sets of targets, one for use during cycle up convergence of electrostatics and one during runtime enable single pass cleaning of developed patches, during cycle up convergence. To this end,...
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5155541 |
Single pass digital printer with black, white and 2-color capability
Method and apparatus for printing toner images in black and at least two highlighting colors in a single pass of the imaging surface through the processing areas of the printing apparatus. Imaging...
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5121172 |
Method and apparatus for producing single pass highlight and custom color images
Single Pass Highlight Color (SPHLC) and Single Pass Custom Color (SPCC) images are made possible on a single print using relatively high development fields compared to the prior art. Three...
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5119147 |
Selective coloring of bi-level latent electostatic images
Selective coloring of bi-level latent electrostatic images is obtained through a combination of 1) a scavengeless development nip enabled by an AC biased wire in self-spaced contact with a toned...
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5078087 |
Development apparatus
An electrophotographic printing machine in which an electrostatic latent image is recorded on a photoconductive surface. One portion of the latent image is a discharged area with the other portion...
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5061969 |
Hybrid development scheme for trilevel xerography
A hybrid development system for developing composite tri-level xerographic latent images in which conductive magnetic brush (CMB) development system is employed at the first development station and...
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5049949 |
Extension of tri-level xerography to black plus 2 colors
Highlight color printing apparatus and method for forming one black and two color images. A tri-level image containing CAD and DAD image areas and a background area is formed. A second DAD image is...
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5045893 |
Highlight printing apparatus
Apparatus and method of forming plural images, wherein the method includes the steps of: uniformly charging a charge retentive belt; discharging portions of the uniformly charged belt to form...
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5030996 |
Image forming apparatus with AC bias voltages for preventing developer mixture
An image forming apparatus includes an image bearing member movable through first and second developing positions in the order named and a bias voltage applying device applies a first developing...
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5021838 |
Preferred toner/carrier properties
Tri-Level Highlight color imaging apparatus utilizing two-component developer materials in each of a plurality of developer housings. The triboelectric properties of the toners and carriers forming...
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4984021 |
Photoreceptor edge erase system for tri-level xerography
The prevention of photoreceptor edge development by a discharged image area development system is accomplished by the provison of a photoreceptor charging device which uniformly charges the...
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4961094 |
Electrostatic recording apparatus and method for producing color images
An electrostatic recording apparatus includes a photosensitive drum which is charged at +700 V by a first charger. Intensity of the light emitted from an LED array that is downstream from the first...
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4959695 |
Method and apparatus for forming a multicolor picture by electrophotography
In a method and apparatus of forming a muticolor picture by electrophotography, first color toner, second color toner and third color toner are allowed to stick onto a photosensitive material...
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4937636 |
Single pass, two-color electrophotographic reproduction machine
A reproduction device forms a two-color output copy in a single pass mode. An original document, modified by the formation of a colored fluorescent material on selected portions thereof, is...
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4937629 |
Composite image recording apparatus
An image forming method of the present invention comprises: a first toner image formation process for forming a first toner image by forming, on a latent image carrier, a first latent image which...
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4937630 |
Image forming apparatus employing non-magnetic and magnetic toner
An image forming apparatus employs a non-magnetic developing agent and a magnetic developing agent which have been charged to opposite polarities to develop at least first and second latent images...
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4901114 |
Tri level xerography using a MICR toner in combination with a non-MICR toner
Disclosed is an electronic printer employing tri-level xerography to superimpose two images with perfect registration during the single pass of a charge retentive member past the processing...
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4901100 |
Single pass color highlighting copying system
An apparatus in which a copy of an original document has selected portions thereof color highlighted. An editing device, associated with an electrophotographic printing machine, selects the...
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4868611 |
Highlight color imaging with first image neutralization using a scorotron
Highlight color imaging method and apparatus including structure for forming a single polarity charge pattern having at least three different voltage levels on a charge retentive surface wherein...
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4868608 |
Highlight color imaging apparatus
Tri-Level Highlight color imaging apparatus and cleaner apparatus therefor. Improved cleaning of a charge retentive surface is accomplished through matching the triboelectric properties of the...
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4847655 |
Highlight color imaging apparatus
A magnetic brush developer apparatus including a plurality of developer housings each including a plurality of magnetic brush rolls associated therewith. Conductive magnetic brush (CMB) developer...
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4833504 |
Single pass highlight color printer including a scavengeless developer housing
A magnetic brush developer apparatus comprising a plurality of developer housings each including a plurality of magnetic rolls associated therewith. The magnetic rolls disposed in a second...
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4827869 |
Single and multi-color developing apparatus
An apparatus includes first and second developing sleeves which are sequentially arranged in this order along a rotational direction of a photosensitive body to face the photosensitive body. The...
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4771314 |
Developer apparatus for a highlight printing apparatus
Printing apparatus for forming toner images in black and at least one highlighting color in a single pass of a change retentive imaging surface through the processing areas, including a development...
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4761672 |
Ramped developer biases
Undesirable transient development conditions that occur during start-up and shut-down in a tri-level xerographic systemw when the developer biases are either actuated or de-actuated are obviated by...
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4761668 |
Highlight color printer
Apparatus for minimizing the contamination of one dry toner or developer by another dry toner or developer used for rendering visible latent electrostatic images formed on a charge retentive...
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4731634 |
Apparatus for printing black and plural highlight color images in a single pass
The method and apparatus for rendering latent electrostatic images visible using multiple colors of dry toner or developer and more particularly to printing toner images in black and at least two...
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