摘要:
A color process in which color copies of an original document containing color information are reproduced. Successive single color electrostatic latent images are developed with particles having a predetermined triboelectric charge thereon. These particles are transferred from the single color electrostatic latent images to a sheet of support material in a prescribed sequence. The sequence of transfer is such that each successive layer of toner particles transferred to the sheet of support material has a lesser triboelectric charge thereon than the preceeding layer transferred thereto. In this manner, back transfer from the sheet of support material to the electrostatic latent image is minimized.
摘要:
An apparatus in which at least a pair of developer rollers deposit toner particles on an electrostatic latent image recorded on a photoconductive member to render it visible. One of the rollers rotates at a first tangential velocity being spaced a first distance from the photoconductive member. The other roller rotates at a second tangential velocity being spaced a second distance from the photoconductive member. The second tangential velocity is greater than the first tangential velocity with the second distance being less than the first distance.
摘要:
In an electrophotographic imaging device, in which an electrostatic image is formed and developed on a first support to form a toned image, and the toned image is transferred to a second support substrate and subsequently to a final support, and in which to form color images, a succession of toner images are superposed on each other by transfer from one or more first support to the second support, transfer efficiency is enhanced and color consistency is improved by providing an order of superposition which places the toner having the greatest residual mass/area dependent color instability in a position of being sandwiched between or protected by two or more other toner images whose color contribution to gray balance is not as greatly dependent on mass per unit area. Thus, during transfer, the sandwiched or middle layer(s) will retain integrity.
摘要:
In an ionographic device projecting a modulated stream of ions in imagewise fashion towards a moving imaging surface, including an ion printing head having an ion chamber supporting a coronode held at a voltage V.sub.C to produce ions for deposit on an imaging surface and a modulation channel extending from the ion chamber towards the imaging surface through which a stream of ions is directed for imagewise modulation by a plurality of modulation electrodes, electric field distribution within the ion chamber is controlled by selectively varying voltages along the surface regions of the ion chamber to different voltage levels, in an arrangement causing focusing of ion density in the area of the ion chamber adjacent to the modulation channel. An increased ion density in the area of the ion chamber adjacent to the modulation channel assists in providing an increased corona current at the output of the device.
摘要:
Electrostatographic apparatus comprising an imaging surface with an electrostatic transfer evice to transfer toner particles to a receiving sheet and an apparatus to detack the sheet from the drum comprising a plurality of conductive fibers extending cross the rear side of the receiving sheet which are spaced from the sheet and have applied thereto a low voltage direct current potential of a polarity opposite the polarity on the receiving sheet and sufficient to cause air breakdown between the receiving sheet and the end of the fibers to provie a controlled neutralization of charge on the receiving sheet to a potential level above zero and thereby separate the receiving sheet from the drum by virtue of its own weight and beam strength.
摘要:
A reproducing machine in which a member has successive latent images recorded thereon. The reproducing machine includes a pair of developer units. One developer unit is located in the operative position in the reproducing machine with the other unit being remote therefrom. Each developer unit contains different colored particles. Color changes are achieved by interchanging developer units to develop one latent image with particles of one color and the other latent image with particles of the other color.
摘要:
Apparatus and method for reducing toner contamination in an electrostatographic reproducing machine are described wherein at at least one housing which performs an operation on an imaging surface bearing an electrostatic latent image involving charged toner particles has at least one electrode extending across the width of and spaced from the imaging surface at at least one exit portion through which air normally flows from the housing to other portions of the machine, the electrode being electrically biased to a polarity and magnitude selected relative to the charge on the imaging surface to create an electric field barrier in the exit portion sufficient to repel the charged particles in the exiting air back into the principal portion of the housing substantially without restricting the air flow from the exit portion. In a preferred embodiment the electrode is positioned substantially parallel to the imaging surface. This electrostatic seal arrangement may be used in development or cleaning housings and a preferred mode is used in a magnetic brush development housing at the imaging surface entrance portion where the magnetic brush moves in a direction counter to the direction of the imaging surface.
摘要:
An apparatus in which a latent image recorded on a member is developed with particles. The apparatus includes a housing having a chamber for storing a supply of particles therein. During the development process, particles are deposited on the latent image recorded on the member. These particles are purged from the chamber of the housing to permit particles of a different color to be disposed therein.
摘要:
The undesirable image defect of dragout of liquid ink development (LID) toned images generated from the development zone, formed by an imaging member and a metering/development member, can be prevented. Background development of the toned images is suppressed in an image enhancement zone. With the aid of an enhanced electrostatic field, created by an electrode biased at a voltage other than normal development bias in the metering zone, the toned layer can resist higher viscous forces. Image dragout, due to the viscous shear from liquid ink, can therefore be eliminated.
摘要:
An ionographic imaging member has a conductive layer overcoated by a charge accepting layer. Overcoating layers of acrylate, polycarbonate, polyester, polyurethane, acrylic homopolymer or copolymer and the like are provided. Blocking layers may be provided for preventing charge injection and reducing surface charge decay and bulk charge trapping. The charge accepting layer may be doped with a charge clocking material for preventing charge injection. The overcoating and blocking layers may be one and the same.