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Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 5450189 | Electrophotographic imaging with toners of opposite sign electrical charge A system and method for electrophotographic printing an image with a plurality of toners, where the plurality of toners includes toners that are attracted to either a first charge potential or a second charge potential. The electrophotographic system incl... | 09/12/1995 |
| 5447056 | Toner concentration control system for liquid electrophotography An "L" shaped element having horizontal and vertical sections, is submerged in the liquid toner concentrate such that the horizontal section is totally submerged while the vertical section is submerged proportionally to an amount of the liquid toner conce... | 09/05/1995 |
| 5410388 | Automatic compensation for toner concentration drift due to developer aging A method of maintaining consistent large solid area development by developing a large area test patch covering the image area of a photorececptor and detecting the lead edge and trail edge density of the test patch using a densitometer to measure reflecta... | 04/25/1995 |
| 5402209 | Electrophotographic reproduction apparatus controllable toner density and method thereof for controlling an electrophotographic reproduction process An apparatus includes a system controller which calculates a ratio of a first signal to a second signal and adjusts a control parameter of an electrophotographic reproduction process so that the density of fog indicated by the ratio is within a predetermi... | 03/28/1995 |
| 5386276 | Detecting and correcting for low developed mass per unit area A method of maintaining consistent large solid area development by developing a large area test patch covering the image area of a photorececptor and detecting the lead edge and trail edge density of the test patch using a densitometer to measure reflecta... | 01/31/1995 |
| 5373351 | Electrostatic recording apparatus and managing system thereof A parallel circuit of a capacitor and a varistor is connected between a ground and an aluminum cap of a photosensitive drum having a photoconductor sheet wound on a surface of an aluminum drum. The capacitor is charged by a charger. A developer roll conne... | 12/13/1994 |
| 5365318 | Developer unit utilizing a non-magnetic single component developer Stable developing can be made with no inferior image, irrespective of variations in factors relating to the developing function, which affect the developing function, such as a variation in surrounding circumstance, surface potentials of an electrostatic ... | 11/15/1994 |
| 5329339 | Laser beam printer capable of forming line images having stable image width An image forming apparatus wherein a latent image is electrostatically formed on a surface of a photosensitive member and developed by a developing device. In the above image forming apparatus, the reference line image is formed on the surface of the phot... | 07/12/1994 |
| 5309207 | Apparatus for forming image The picture image forming apparatus of a type which performs a light exposing on an image holding surface charged at a constant voltage by a charging device having a grid electrode to form an electrostatic latent image and then supplies a toner from a dev... | 05/03/1994 |
| 5285241 | Maintaining precise electrostatic control using two ESVs Erroneous voltage readings of Electrostatic Voltmeters (ESVs), which have become contaminated by charged particles (i.e. toner) from developer housings used for developing latent images on a photoreceptor surface, are negated by adjusting the readings of ... | 02/08/1994 |
| 5262828 | Developing bias power unit for use in an image forming apparatus An image forming apparatus accommodates a developing bias power unit for applying a bias voltage to a developing sleeve confronting a photosensitive member. The developing bias power unit includes a DC power source, an electricity storage element interpos... | 11/16/1993 |
| 5243391 | Varying an electric field, during development of a latent electrostatic image with developer solution, in proportion to a sensed concentration of toner that is within the developer solution The separation between two plates or electrodes--between which plates a developer solution is applied to develop a latent electrostatic charge image on a photoconductive medium within an electrophotographic imager--is varied in proportion to a detected co... | 09/07/1993 |
| 5235385 | Method and apparatus for controlling toner image density An apparatus for controlling the transmission density of a layer of pigmented thermoplastic marking particles (e.g., electrographic toner) being deposited on a dielectric film or layer by an electrically biased particle applicator. Such apparatus uses (a)... | 08/10/1993 |
| 5227842 | Electrophotographic image forming apparatus which controls developer bias based on image irregularity An image forming apparatus having a developing device of the type using a two-component type developer and developing an electrostatic latent image by a bias electric field having an alternating electric field. A predetermined reference latent image is el... | 07/13/1993 |
| 5155530 | Toner process control system based on toner developed mass, reflectance density and gloss A method for controlling toner developed mass per unit area in an electrostatic or electrophotographic device includes the steps of: forming a toner image on a printing sheet; measuring a toner density of the toner image on the printing sheet; measuring a... | 10/13/1992 |
| 5124750 | Toner density detecting method, and image forming method and apparatus employing the toner density detecting method A method of detecting the toner density of a standard test toner image which comprises the steps of forming on the photosensitive drum a saturated test toner image from which the amount of diffused light is to be measured as a saturation level as well as ... | 06/23/1992 |
| 5097277 | Cyclonic toner charging donor Direct Electrostatic Printer including a combination toner charging and delivery system. The combination toner charging and delivery system serves to convey well charged toner to an area adjacent an apertured printhead through which toner particles are pr... | 03/17/1992 |
| 5089832 | Image forming apparatus An image forming apparatus includes recording electrodes electrically isolated from each other, a recording medium movable relative to the recording electrodes and a developer supplying device for supplying a conductive developer into between the recordin... | 02/18/1992 |
| 5045883 | Image density control method using exclusive patterns for an image forming apparatus An image density control method for an image forming apparatus for forming a plurality of exclusive patterns on a photoconductive element, or image carrier, and controlling an image forming condition based on the exclusive patterns so as to control image ... | 09/03/1991 |
| 5034775 | Triboelectric charge measurement An apparatus in which the triboelectric charge of developer material toner adhering to carrier is measured. In the development system, a magnetic roller transports developer material closely adjacent a donor roller. The donor roller is electrically biased... | 07/23/1991 |
| 5006897 | Determination of charge-to-mass ratio In electrostatographic apparatus, the ratio of toner particle electrostatic charge-to-toner particle mass and the development rate are determined by providing a piezo device positioned to interact with toner particles. The device is periodically electrica... | 04/09/1991 |
| 4972230 | Toner usage detector based on current biasing mixing means An apparatus which measures the usage of toner in a developer unit. A donor roll receives toner material from a mixer. The mixer fluidizes the toner with the pressure from newly discharged toner moving the fluidized toner from one end of the developer uni... | 11/20/1990 |
| 4947212 | Developing apparatus with color dependent toner supply voltage An electrophotographic copying apparatus includes a main body, a developing system, removably mounted on the main body, provided with a developing device having the developing sleeve holding a carrier on the outer surface, and a toner cartridge having a t... | 08/07/1990 |
| 4887102 | Image forming apparatus An image forming apparatus includes a first developing device for forming a first toner image and a second developing device for forming a second toner image including a developer carrying member spaced apart from the image bearing member by a distance an... | 12/12/1989 |
| 4870460 | Method of controlling surface potential of photoconductive element A control method applicable to an electrophotographic copier for protecting the background of copies against smears due to a residual potential on a photoconductive element. Before a visible pattern is produced, the photoconductive element is charged by a... | 09/26/1989 |
| 4833500 | Developing apparatus A developing apparatus in a transfer-type electrophotographic system having a photosensitive body, wherein the developing apparatus includes a developing roller spaced a small distance from the photosensitive body for supplying a developing solution to th... | 05/23/1989 |
| 4814834 | Electrophotographic apparatus An electrophotographic apparatus capable of operating both in a mode for obtaining a positive image from a negative original and in a mode for obtaining a positive image from a positive original and capable of constantly controlling the image density in e... | 03/21/1989 |
| 4801967 | Voltage sensing in A.C. corotrons A voltage measuring device in an electrostatographic arrangement having a photoreceptor member charged to a uniform voltage level prior to imagewise discharge, and including at least a first corotron having a corona producing coronode driven with an A.C. ... | 01/31/1989 |
| 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 station, of the printing apparatus. The development stati... | 09/13/1988 |
| 4745434 | Copying apparatus having progressive control means A copying apparatus or the like having means for scanning the original to form a line image continuously on a photosensitive member, thereby forming an entire image of the original. A photosensor is provided to scanningly detect the density of the origina... | 05/17/1988 |
| 4717999 | Image forming apparatus An image forming apparatus includes an image bearing member having a conductive layer and a surface layer capable of retaining electric charge, driving device for moving the image bearing member, toner supplying device for supplying conductive or semicond... | 01/05/1988 |
| 4682882 | Image recording apparatus A image recording apparatus capable, in the measurement of the background density of an original image, of detecting and omitting an area exceeding a determined width and a determined density in the determination of the background density, thus avoiding i... | 07/28/1987 |
| 4666290 | Cartridge loading device for a copying machine A cartridge loading device for a copying machine including a lamp which illuminates the color display unit of the copying machine; a switch that turns itself on when any of plural kinds of developer baths or toner cartridges are loaded; and a sensor that ... | 05/19/1987 |
| 4641200 | Image reproducing apparatus with variable AC bias An image reproducing apparatus wherein latent images are formed on an image retainer by a plurality of latent image forming device and the latent images are developed by developing means to which a developing bias is applied. The developing bias can be ap... | 02/03/1987 |
| 4626096 | Image forming apparatus for forming a visual image in accordance with image signals An image forming apparatus is used in conjunction with a signal generator for producing an image signal representing an image to be recorded. The apparatus includes a device for forming a visible image with visible material on an image bearing member. The... | 12/02/1986 |
| 4624548 | Image density control device There is disclosed an image density control device having original density detector, a leading edge detector for detecting a leading edge of original, and controller for controlling image forming conditions in accordance with an output of said original de... | 11/25/1986 |
| 4619522 | Dual mode image density controlling method A dual mode method for controlling the density of a toner image is disclosed for an electrophotographic process. In the first mode, an electrostatic latent image is formed on a photosensitive member from a reference pattern having a predetermined reflecta... | 10/28/1986 |
| 4607954 | Automatic developing bias control device An automatic developing bias control device for an electrophotographic copying machine in which a document image is led onto a photoreceptor through a lens to form an electrostatic latent image on the photoreceptor and the electrostatic latent image is vi... | 08/26/1986 |
| 4565438 | Development system using electrically field dependent developer material An apparatus in which an image region recorded on a photoconductive surface is developed with a developer material comprising at least carrier granules and toner particles. The developer material has the resistivity thereof varying continuously as a funct... | 01/21/1986 |
| 4492179 | Control system for regulating the dispensing of marking particles in an electrophotographic printing machine An apparatus which develops a latent image with marking particles. The apparatus includes a developer roller which transports the marking particles closely adjacent to the latent image. As the marking particles are deposited on the latent image, the devel... | 01/08/1985 |
