Abstract: A method for controlling an air sampling pump includes establishing from empirical measurement a family of sets of data relating speed of the pump to the flow rate of air through the pump as a function of pressure drop of the air at the pump inlet and storing the data in an electronic memory. The pump is then operated at a selected speed corresponding to a desired air flow rate and selected inlet pressure drop. The actual pressure drop is measured and a pair of sets of pressure drop values are identified in the stored data, which values bracket the actual measured pressure drop. The desired air flow rate and corresponding pump RPM value for each of the identified pair of sets of differential pressure values are located and extrapolation is used to locate a new value of RPM for delivering the desired air flow rate at the actual measured value of pressure drop. The pump is then operated at the new RPM value.

Abstract: The present invention provides a method for reducing short time-scale reciprocity failure effects of a photosensitive imaging sheet. The photosensitive imaging sheet comprises a substrate having a layer of microcapsules on one surface thereof. The microcapsules contain an internal phase of an acrylate monomer, photoinitiator, and color former. A portion of the microcapsules of the imaging sheet is image-wise exposed to high intensity light and then allowed to recover from the exposure. The exposure and recovery steps are repeated to form a latent image. By pulsing the light onto the photosensitive imaging sheet, the total exposure energy required per unit area is significantly reduced compared to the known short time-scale exposure method.

Abstract: A real time graphic processor is disclosed which processes graphic cell specifications on a scan line-by-line basis to generate pixel data. The pixel data from each cell specification is assembled to form a completed scan line of pixel data which is used to modulate a printing element, such as a laser diode. The invented graphic processor contains a special purpose cell specification processor which, in addition to generating the pixel data, modifies the cell specification by substituting new horizontal location and cell height indicator values. The modified graphic cell specification is then recirculated to the cell specification processor memory for processing the next scan line.

Abstract: Disclosed is a processor and method for the real time generation of linear arrays of pixel data. The generated pixel data is used to modulate a laser diode as it scans across a printing medium, thereby producing printed font and logo characters.In accordance with the present invention, the real time processor receives a series of cell specifications on a scan line-by-scan line basis, the cell specifications identifying the font type and placement information. The real-time processor uses this information to access from its font memory a linear array of pixel data corresponding to the identified font type. The accessed pixel data is used to modulate the laser diode as it scans the printing medium line-by-line. Thus, as the laser diode is modulated by the pixel's "ones" and "zeros", it is pulsed "off" and "on", thereby generating pixel dots on the print medium itself or on a photosensitive drum which subsequently prints an image on a page through an electrostatic process.

Abstract: The present invention relates to magnetic toner imaging-multiplexing techniques and apparatus wherein the number of required voltage drivers is substantially reduced. The apparatus includes a multi-pole magnet assembly surrounded by a shell-like member operatively coupled to a drive motor for creating relative motion between said magnet assembly and said shell-like member. A multiplicity of helical, highly permeable electrodes are circularly disposed around the periphery of the shell member with electrical connections to external voltage drivers through a slip-ring assembly. Magnetic imaging toner is circulated across the toner electrodes as a result of the relative motion between the shell and the magnet assembly. Field concentrating apparatus is disposed within the shell adjacent to a dielectric drum on which the intelligible image is to be produced.