Hoechst Aktiengesellschaft

Kurt Dryczynski

Roland Moraw

Gunther Schadlich

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 method and apparatus for recording and erasing images on thermoplastic photoconductive recording material wherein an adjustable heat supply is provided to the recording medium dependent upon the temperature of the recording medium at the start of the heating cycle. A bridge circuit is disclosed for heating the recording medium and for sensing the temperature thereof such that the heating current supplied to the heating means is regulated according to the instantaneous temperature of the recording medium.

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Hofheim, Germany

Kurt Dryczynski