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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 7957681 | Developing device A developing device includes a developing container in which a developer is contained; a developer carrying member for carrying the developer and feeding the developer by rotation thereof to a developing zone in which the developer carrying member opposes an image b... | 06/07/2011 |
| 7383004 | Image forming apparatus A pulse-like DC voltage is applied from two power sources to transfer residual toner uniformizing means and toner charge amount control means, respectively, to expel transfer residual toner deposited on these means from these means onto a photosensitive drum. In a l... | 06/03/2008 |
| 7202960 | Print sheet original authentication system, printer device and checking device An original authentication system and structural elements thereof is provided, in which it is possible to easily distinguish between an original and a copy. The checking device 13 comprises: a print sheet reading sensor 201 for reading the print patter... | 04/10/2007 |
| 7036921 | Sheet conveying method, sheet attracting conveying apparatus and recording apparatus The present invention relates to a sheet conveying apparatus and method using a conveyance belt formed with a plurality of electrodes for attracting a sheet with electrostatic force. The electrodes are applied with a voltage changed along with the lapse of time for ... | 05/02/2006 |
| 6795101 | Direct imaging process with feed back control by measuring the amount of toner deposited An image forming device includes an image forming element moving past an image forming station in which a toner is deposited on the surface of the image forming element, the image forming element having at least one electrode extending over a predetermined surface a... | 09/21/2004 |
| 6668146 | Hybrid scavengeless development using direct current voltage shift to remove wire history An image transfer apparatus with the capacity to reduce or clean wire history. The cleaning is performed by supplying a voltage burst to shift, relative to nominal, the D.C. component of the electrode bias relative to the electrical bias of the donor memb... | 12/23/2003 |
| 6538757 | Method for automatically reading electronic tickets An automatic method for reading a graphic field on a ticket so that the ticket may be processed quickly without human error. The graphic field is designed to produce a "tell", a visible known image (a large number of detectable halftone gray steps) when p... | 03/25/2003 |
| 6473578 | Developing apparatus A developing device includes a rotatable developer carrying member for carring a developer; a magnet roller provided in the developer carrying member; a first electrode portion connected electrically with the developer carrying member, the first electrode... | 10/29/2002 |
| 6256465 | Image forming apparatus and image forming unit therefor An image forming apparatus capable of obviating a defective image ascribable to image transfer and an image forming unit therefor are disclosed. A nonconductive sheet member is affixed to the surface of a conductive sheet member which will face a paper or... | 07/03/2001 |
| 6014537 | Method of developing an image in an image forming apparatus An image forming apparatus is used, in which an electrostatic image formed on a moving image forming belt is developed by AC development. Where the image forming belt moves at a speed of vp mm/s, the cleaning potential is Vcl volts, ... | 01/11/2000 |
| 5999777 | Image forming apparatus capable of temporarily breaking the contact between the developer and the photosensitive drum with use of electric field An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; a first developing device for developing the electrostatic latent image on the image bearing member; a second developing device, faced to the image bear... | 12/07/1999 |
| 5963767 | Image printing apparatus An image printing apparatus includes a number of image forming units for forming toner images of different colors in alignment on image receiving material in accordance with electronic image information signals fed to each image forming unit. Each image f... | 10/05/1999 |
| 5911098 | Development apparatus and method using selectively applied AC voltages A development apparatus according to the invention comprises at least two developer carrier members in juxtaposition for transporting a developer material to a development region between the developer carrier members and an image bearing member in opposed... | 06/08/1999 |
| 5745827 | Bundled steel wire SED communicator secondary cores A donor roll for transporting marking particles to an electrostatic latent image recorded on a surface is provided. The donor roll includes a rotatably mounted body and an electrode member mounted on the body. The donor roll further includes a magneticall... | 04/28/1998 |
| 5648839 | Image forming apparatus An image forming apparatus includes a photoconductor, a developing electrode, at least a magnet disposed in the developing electrode, and a developer. The developing electrode is reciprocally movable against a rotation axis of the photoconductor. Thus, a ... | 07/15/1997 |
| 5602630 | Developing device A non-contact type of developing device for use in an image forming apparatus having an image forming body, includes a developer conveying body facing the image forming body in which a magnet body having a plurality of magnet poles are attached therein, t... | 02/11/1997 |
| 5572302 | Electrode wire positioning for scavengeless development An apparatus for supporting wires in a wire module for use in a scavengeless development system using wire maintaining members that longitudinally support the wires. The tops of the wire maintaining members have grooves that positively position the wires ... | 11/05/1996 |
| 5559586 | Image forming device having control grid with applied voltage of the same polarity as toner In the invention, toner on a toner carrier is charged with negative polarity and attracted by applying positive voltage to a backing electrode placed at the back of a transfer belt. Voltage is applied across the electrodes arranged crosswise in directions... | 09/24/1996 |
| 5559541 | Direct recording method In a direct recording method, toner supplied on a toner carrier contains at least fixing resin and magnetic grain, and has an apparent density of 0.5 g/cc or more and an angle of repose of 45° or less. The magnetic flux density on the toner carring membe... | 09/24/1996 |
| 5464720 | Electrophotographic method and apparatus using magnetic toner An image forming method is disclosed which comprises forming a latent image on a latent image bearing member, carrying a magnetic toner onto a developer carrying member provided with a magnetic field forming means, forming on the developer carrying member... | 11/07/1995 |
| 5444518 | Image forming apparatus which adds identification information to recorded images to prevent forgery An image forming apparatus including an image reading unit for reading an original and for outputting image data corresponding to the original, an image processing unit for processing the image data supplied from the image reading unit in accordance with ... | 08/22/1995 |
| 5307126 | Magnetic brush developing apparatus A developing sleeve rotary type magnetic brush developing apparatus which includes a developing sleeve having a magnet member with magnetic poles in it, an insulative layer provided on the surface of the developing sleeve, and a toner supply roll disposed... | 04/26/1994 |
| 4614419 | Pre-development inductive charging of developer material An apparatus in which a latent image recorded on an image receiving member is developed with developer material. A conductive developer roller transports the developer material into a development zone for depositing developer material onto the latent imag... | 09/30/1986 |
| 4553827 | Electrophotographic copying apparatus including an enlarged image developing station An assembly for developing a latent electrostatic image formed on the photosensitive outer surface of a rotating developing drum making up a part of an electrophotographic copying apparatus is disclosed herein. This assembly includes a supply of developer... | 11/19/1985 |
| 4434221 | Toner concentration detection by measuring current created by transfer of carrier component to non-image areas of image support surface An improved toner concentration detection and control method to be applied to an electrophotographic copying apparatus or the like which is so arranged that, part of an electrostatic latent image support member outside its image region is utilized as a ca... | 02/28/1984 |
| 4384545 | Development system An apparatus which develops image areas recorded on a surface by transporting a developer material into contact therewith. The apparatus includes a conductive member and an insulating member spaced therefrom. Developer material transported by the conducti... | 05/24/1983 |
| 4292921 | Electrographic development apparatus Improved electrographic development apparatus and procedure for use with partially-conductive developer employs transport of the developer through a first development zone in a direction generally countercurrent to a moving image member and through a seco... | 10/06/1981 |
| 4287850 | Magnetic brush developing apparatus A magnetic brush developing apparatus for use in a toner powder image transfer type electrophotographic copying machine which includes an outer cylinder fixedly disposed at a position to confront a photosensitive member or photoreceptor, a magnet roller r... | 09/08/1981 |
| 4235549 | Developing station for an electrostatic copier A developing station for an electrostatic copier which station includes a magnetic roller connected to a rotary drive and disposed within a stationary sleeve made of a non-magnetizable material. The magnetic roller is adapted to receive a powdered toner, ... | 11/25/1980 |
| 4128328 | Developing electrode type electrostatic copying machines An electrostatic copying machine uses a copy sheet having a dielectric layer or photoconductive layer overlaying an electrically conductive layer, and includes image forming structure for forming an electrostatic latent image on the copy sheet, a develope... | 12/05/1978 |
| 4050413 | Magnetic brush crossmixing system A magnetic brush development system within a photocopier that circulates developer by the use of magnetic rollers includes deflecting members interposed between the rollers that are oscillated laterally to maintain homogeneity of developer circulating ove... | 09/27/1977 |
| 4015561 | Anti-gravitational cascade development for electrostatic processors Latent electrostatic images carried by a photoconductively coated substrate of an electrostatic processor are developed in a magnetic field free development zone by a multicomponent developer. The developer circulates in a path which runs from a lower lev... | 04/05/1977 |
| 3991713 | Development apparatus for an electrostatographic printing machine An apparatus which develops an electrostatic latent image with electrostatically charged particles. The apparatus produces a magnetic field which forms a brush-like array of charged particles. A development electrode is operatively associated with the mag... | 11/16/1976 |
| 3990394 | Control circuit used in development of electrostatic latent images and developing apparatus A control circuit used in the development of electrostatic latent images which applies a suitable biasing voltage to a magnetic brush developing unit to alleviate problems of fogging and breakdown of the photosensitive layer. The effective biasing voltage... | 11/09/1976 |
| 3989007 | Developing chamber for electrostatic latent images In a developing chamber for electrostatic latent images, to avoid potential fluctuations within the developer, in particular in the field of the magnet, and to increase the frictional forces between the toner and the paper, an auxiliary electrode which is... | 11/02/1976 |
| 3967892 | Development system An apparatus in which an electrostatic latent image is developed with electrostatically charged particles. A brush-like array of charged particles is positioned closely adjacent to the electrostatic latent image. A portion of the charged particles are sep... | 07/06/1976 |
| 3965862 | Xerographic development system An apparatus for developing a latent image on a charged photosensitive surface of a xerography printing machine has a magnetic brush assembly including a donor roll and a cleaning electrode adjacent to the roll for reducing the accumulation of toner parti... | 06/29/1976 |
