Hoechst Aktiengesellschaft

Kalle, Niederlassung Der Hoechst Ag

Gunther Schadlich

Roland Moraw

Klaus Horn

Kurt Dryczynski

In the device and method of the present invention, a stripping roller is positioned a short distance from an electrostatically charged photoconductor surface in an electrophotocopy machine. The roller is supplied with a bias voltage which has a polarity the same as that of the charge on the photoconductor surface and a magnitude which is equal to or higher than that of the photoconductor surface charge, but greater than 1 kV. The photoconductor surface is moved past the stripping roller to remove excess developer liquid.

Device and method for stripping developer from a photoconductive surface

A method and an apparatus for charging a dielectric layer electrostatically to a predetermined potential. An AC electrode is arranged at a distance from the dielectric layer and connected to one output of an AC voltage generator. The AC voltage generator has the other output connected to an output of a DC voltage generator. Between the AC electrode and the dielectric layer there is a DC electrode which is connected to the other output of the AC voltage generator. The dielectric layer rests on a counter-electrode which is connected to the other output of the DC voltage generator and is at ground potential. Each of the electrodes can comprise one or a plurality of mutually insulated single electrodes.

Method and apparatus for electrostatically charging a dielectric layer

A process and apparatus for rendering visible an electrostatic charge image. The visible image is formed on the surface of a liquid by positioning a charge image adjacent the liquid at distances of about 10 to 1,000 .mu.m from the surface of the liquid without contacting the liquid.

Process and apparatus for rendering visible charge images

An electrophotographic copying process is disclosed comprising the steps of performing a cleaning operation on a recording element by carrying out at least one rinsing operation of the element utilizing a first quantity of a developer liquid; performing a series of copying cycles comprising charging, exposing, developing with a liquid developer, transferring and fixing; and intermittently performing additional cleaning operations independently of each cycle of the series of copying cycles using a quantity of developer liquid which is at most as great as the first quantity.

Cyclic electrophotographic copying process

Disclosed is a device for use in an electrophotographic copying machine to remove developer liquid from a recording material, comprising a rotatable drum carrying on its outside circumferential surface the recording material which is intended to be charged and exposed to an optical image of an original in order to produce a latent charge image thereon; and a roller mounted parallel to the drum for rotation in the direction opposite to the direction of movement of the recording material for applying a developer liquid to the latent charge image on the drum. The roller is arranged to provide a gap between the roller and the recording material, and the roller comprises a surface layer of a material having a smaller coefficient of friction than the recording material and a thickness such that the gap between the roller and the recording material on the drum is less than about 0.05 mm.

Device for removing developer liquid from a recording material

This invention relates to a process for shaping a recording produced on a material including a photoconductive, thermoplastic layer disposed on a carrier by electrostatic charging and exposure to light, which process comprises disposing the said material on a rigid base, at least one surface region of which is electrically conductive, and heating it.

Process for shaping a thermoplastic layer

Disclosed is a recording material comprising a first transparent, dielectric support member having on one surface thereof a plurality of first elongated, electrically conductive regions extending adjacent one another in spaced relationship; a layer comprising a photo-conductive, thermoplastic material adjacent to, but spaced from, the surface of the first support member; and a second transparent dielectric support member positioned contiguous to the photo-conductive layer on the side opposite the first support member, the second support member having on the surface thereof adjacent the photo-conductive layer a plurality of second elongated, electrically conductive regions extending adjacent one another in spaced relationship, the longitudinal axis of each of the second elongated, electrically conductive regions extending generally transversely to the longitudinal axis of each of the first elongated, electrically conductive regions to form cross-over regions.

Recording material having intersecting conductive strips and apertured

Disclosed are a method for serially recording and optically reproducing X-ray images on a recording material and an apparatus for carrying out the method. The method comprises the steps of disposing the recording material in an ionization chamber filled with a gas which is ionizable by X-rays; applying a high voltage across the ionization chamber; passing the X-rays to be recorded into the ionization chamber; heating the recording material until a deformation image is formed according to the charge distribution produced during irradiation due to the ionization of the gas; optionally cooling and fixing of the deformation image; optically reproducing, the deformation image; re-heating the recording material in the ionization chamber until the deformation image is erased by smoothing; optionally cooling the recording material and repeating the entire recording cycle.

Method and apparatus for recording and optically reproducing X-ray images

Disclosed are a method and apparatus for verifying an identification card or the like having visible indicia thereon and also having on a portion thereof a hologram of said visible indicia as originally placed on the identification card. The method comprises the steps of: producing an optical image of the visible indicia on the identification card; producing a reconstructed image of the hologram on the identification card; projecting the optical image and the reconstructed holographic image, in superimposed register, and either continuously or intermittently, e.g., alternately, upon a common optical image plane; and comparing the images on the image plane. The apparatus comprises suitable optical elements for carrying out these steps using either a single laser light source or such a light source together with a conventional light source.

Comparison reader for holographic identification cards

A method and apparatus are disclosed for recording information by deformation on a recording material having a photoconductive thermoplastic layer supported by a flexible transparent backing layer, characterized by the provision of electrostatic attraction means for stabilizing the recording material against lateral displacement during the continuous transport of the recording material through an exposure station. To this end, there are provided corona means for electrostatically charging the recording material prior to the transport thereof through the exposure station, and a stationary conductive layer of a given potential is arranged beneath the recording material opposite the charging and exposure stations, whereby the charged recording material is attracted to the conductive layer. A further conductive layer of given potential may be provided for stabilizing the charged recording medium during transport through a read-out station. Laterally flanged guide roller means are also provided for laterally stabilizing the recording material during transport between the supply and take-up reels.

Process and apparatus for recording deformation images

A recording apparatus and method utilizing a photo-thermoplastic recording medium and a carriage mounted corona charging device. Means are provided to delay exposure of the recording medium until vibrations from the carriage have ceased. Means are provided for both manual and automatic operation.

Thermoplastic recording apparatus

Disclosed are a method and apparatus for holographically recording a plurality of holograms on a recording material. The method comprises producing two coherent light beams, altering one of these beams by an information bearing object, causing the changed beam to interfere with the other beam at an angle on the recording material, whereby the interference diagram is recorded, repeating these steps for further pieces of information with a changed recording characteristic obtained by altering the spacial arrangement of the two beams striking the recording material relative to a straight line stationary in the recording material by redirecting at least one beam with stationary optical elements.

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Naurod, Germany

Gunther Schadlich