Agfa Gevaert Nv

Agfa-gevaert

Texas Instruments Corporation

Werner F Heirbaut

Robert F Janssens

Dirk K Broddin

Peter Baeyens

Jean-Pierre J Slabbaert

William E Nelson

Venkat V Easwar

Frank A Deschuytere

Luc Van Goethem

Frank C Trouillard

A method is described to control the maximum density and the pixel profile of microdots produced by a binary or multilevel electrophotographic device. In various embodiments, from the maximum development potential. The working point of the device is established by imposing a relation between charge level, discharge level and saturation voltage level of the photosensitive element. This allows to achieve consistent output densities, irrespective of the environmental parameters, such as relative humidity and temperature.

Process control of electrophotographic device

An apparatus for transferring a plurality of toner images having a charge thereon from a photoconductive member to a receptor sheet, the transferring device including a first corona generator for applying a charge to the sheet of polarity opposite to that of the charge on the corresponding toner image and for transferring the toner image from the member to the sheet, a second corona generator, located after the first corona generator, for applying a charge to the toner image on the sheet of a polarity equal to that of the charge on the toner image for increasing the charge thereof, and a grounding electrode opposite to the second corona generator for electrically grounding the opposite side of the receptor sheet.

Device for electrostatically transferring color toner images onto an

A system is described for transporting sheet-like material. The sheet has a powder, such as electrographic toner particles, loosely attached to it at one or both sides. The particles may be laid down in an image-wise manner by an electrophotographic or direct electrographic system, such as a printer or a copier. The sheet is transported by an endless belt or by a drum. In order to preserve the location of toner particles on the sheet, and to establish correct transportation of the sheet, electrostatic charges are applied either to the sheet or the transporting member or both. As such, the sheet suitably adheres to the transport system and electrostatically loaded toner particles may even adhere better to the sheet.

Electrostatic transport system for tonered sheets

A method for controlling the density of microdots produced by a binary or multilevel electrophotographic device. In one example, the toner concentration in a two-component developing system is modified as to keep the toner charge Q/M approximately constant. The toner charge is indirectly assessed. This allows to achieve consistent output densities, irrespective of the environmental parameters, such as relative humidity and temperature.

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Sint-Niklaas, Belgium

Werner F Heirbaut