Abstract: The flash units are housed in reflector assemblies and actuated in a sequence that entirely exposes both sides of the sheet while drawing a constant amount of electrical power. Constructions of the reflector include an extruded housing, snap-in replaceable reflector surfaces, and a manifold structure that achieves cooling, fume scavenging and paper flattening. In one embodiment a two-sided sheet moves past a pair of oppositely directed flash units which are powered by a single power supply. A specularly reflective surface provides a level of reflected illumination which complements the light received directly from the flash tube to provide a constant level of illumination and fuse a toned image.

Abstract: A method and apparatus for converting data representative of a plurality of cells arranged independently of one another on a page into data is raster scan order for subsequent printing. Cell data for individual cells is fetched in an order dependent on the line of raster scan where the cell first occurs and the bit position for the first bit representing the cell. This cell data is compared with earlier fetched cells to build up raster scan lines from cells occuring in the lines.

Abstract: An electrographic printhead assembly comprises first and second sets of electrodes which define an array of crossing regions for generating packets of electric charge. An RF electrode burst actuates a first electrode to generate charge carriers while a varying extraction potential is developed. A second electrode is then activated with one or more control pulses which are synchronized with the RF burst and with selected portions of the varying extraction potential to gate charge carriers from the printhead. This deposits the desired charge level for each dot on an imaging member. The assembly forms a gray scale latent image for printing, and provides enhanced range without requiring higher frequency or longer duration RF bursts.

Abstract: Ionographic raster scan printing apparatus capable of printing with selectable print density utilizes an imaging drum having a surface movable in a process direction, a connector assembly for receiving an imaging module having a characteristic dot density determined by a set of control electrodes individually driven by clocked driver elements, a sensor module for generating density signals representative of the characteristic dot density, and a position encoder for generating position signals representative of the instantaneous position of the imaging drum surface. A scan clock synthesizer module generates activation signals for clocking the driver elements, the signals having a clock frequency proportional to an algebraic combination of the density signals and the position signals.

Abstract: The present invention relates to non-impact printing apparatus and more particularly to apparatus which converts originating image data in ASCII, EPCDIC or equivalent form into output image data in raster scan arrangement suitable for presentation to a printing subsystem.