Abstract: A laser printer is disclosed which is adapted to be used for color imaging. The printer comprises three diode lasers, each of which emits a light beam at a different wavelength. Each of the light beams passes along a separate channel to a pair of dichroic plates which combine the three beams into a single combined beam. The combined beam is scanned by a polygon onto a receiving medium which is sensitive to the infrared. Two cylindrical lenses in each channel are used to focus the beam in the channel at a registration plane located after the beam combining means. An optical relay is used to transfer the combined beam from the registration plane to the polygon and to focus the beam in a cross-scan direction on the polygon. The polygon is optically conjugated to the image plane in order to achieve cross-scan error correction.

Abstract: A focus acquisition servo system and method which speeds the acquisition process by focusing on the recording media of an optical disk while the disk is coming up to speed. Focus is accomplished by jumping the focus actuator from a start position close to the focus position and by ramping the focus actuator away from the surface of the disk while monitoring focus gain. When the focus gain reaches a peak amplitude the disk is in rough focus, ramping is stopped and the focus servo system is activated to lock the focus actuator onto a fine focus on the disk's recording media.

Abstract: The surface temperature of a fusing roller is controlled by sensing both the surface temperature and the temperature of a source of heat for said roller. Each temperature is compared to a nominal temperature for each to derive two error signals. The two error signals are combined to give a combined error signal, which is used to control the amount of energy applied to the source. The source can be an internally heated core or heated external roller riding on the fusing surface.

Abstract: Methods to reduce the quantization error in the higher spatial resolution digital image signals of a hierarchical decomposition and reconstruction scheme are disclosed. The quantization errors in the high spatial resolution digital image signals are reduced by modifying the low spatial resolution digital image signals in a way that can produce only small errors in the low spatial resolution digital image signal. The small errors in the low spatial resolution digital image signal are reduced by utilizing an improved reconstruction method.

Abstract: A film core for an electrophotographic copying or printing machine comprises a core frame member provided at opposite ends with rollers, such frame member being slightly flexible about a steering axis of one of said rollers, to allow pivotal movement of that roller about the steering axis, but being substantially rigid against any other relative pivotal or translational movement between the ends of the core frame by which the rollers are supported.

Abstract: An image processing system for converting gray level, digital, pixel information into binary data. Pixels with digital values close to the threshold value are further processed to determine the binary value to be specified for that pixel. In such cases, the adjacent horizontal pixel is tested and, if that test is inconclusive, the adjacent vertical pixel is tested. Depending upon the tests of whether the adjacent pixels were also close to the threshold value, the current pixel value is assigned the opposite value as the previous adjacent pixel. This has the effect of specifying, for transition areas at the boundaries of text characters and graphic lines, alternating pixels which produce a serrated edge along the borders of the character or line. These edges are of high spatial frequency and are substantially undetectable under ordinary circumstances by an observer. These edges are also smoothed in the printing process by the fusing of the toner to the output medium.

Abstract: A selected finish is applied to a electrophotographic print of a photographic negative at a fusing station. One of a plurality of finishing rollers is moved into operative engagement with a fusing roller to provide the desired finish. The fusing roller is heated internally. The finishing rollers which are rotatable brought into contact with the fusing roller each have a different and distinct surface characteristic. Three types are surfaces are described these being a glossy surface, a matte surface and a textured surface.

Abstract: A multichannel integrated optics modulator is disclosed that generates one or more independently modulated scanning beams. The integrated optics modulator includes at least one waveguide channel provided on an electro-optic substrate, wherein the waveguide channel is divided into a write waveguide channel that extends to an output side of the substrate and a dead-end waveguide channel that terminates before reaching the output side of the substrate. Control signals are selectively applied to electrodes provided above the dead-end waveguide channel and the write waveguide channel to control the coupling of light from the write waveguide channel to the dead-end waveguide channel. Light is coupled out of the dead-end waveguide channel through the use of an absorber located above an end region of the dead-end channel. The integrated optics modulator is incorporated in a variety of scanner mechanisms.

Abstract: A method and apparatus is provided for line scanning a beam receiving member, wherein a scanning beam is angularly or laterally displaced to compensate for scan line spacing error. The beam is displaced according to error arising from variation (flutter) in the relative motion of the beam and the beam receiving member, or according to error arising from movement of the receiving member while the scanning beam travels to a start of scan position, or both. Embodiments of beam displacement means include a refracting tilt plate, a reflecting tilt plate, a diffracting tilt plate, and a tilt prism.

Abstract: A magazine receives a package having a stack of film sheets, such as x-ray film sheets, enclosed within a light-tight flexible bag. When the bag is positioned within the magazine and the magazine closed, the bag is cut and then removed from the magazine through is lightlock. A pair of stripper bars in the magazine are located between the lightlock and the stack of film sheets in the bag. The bars form a curved slot that enables the bag to be withdrawn through the slot while the bars block movement of the film sheets through the slot with the bag.

Abstract: Epoxy resins which have silicon-containing functional groups along the polymer backbone are prepared by reacting a polyether having non-terminal hydroxy groups with a modifying agent which (i) reacts with hydroxy groups and (ii) which also contains trialkoxysilane groups. The modified resins can be reacted with a silicon oxide precursor to form an organic/inorganic composite. The composites are shown to have improved properties at elevated temperatures.

Abstract: A dye-donor element for laser-induced thermal dye transfer comprising a support having thereon a dye layer and an infrared-absorbing material which is different from the dye in the dye layer, and wherein the infrared-absorbing material is an indene-bridged-polymethine dye. In a preferred embodiment, the indene-bridged-polymethine dye has the following formula: ##STR1## wherein: R represents a substituted or unsubstituted alkyl or cycloalkyl group having from 1 to about 6 carbon atoms or an aryl or hetaryl group having from about 5 to about 10 atoms; R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each independently represents hydrogen, halogen, cyano, alkoxy, aryloxy, acyloxy, aryloxycarbonyl, alkoxycarbonyl, sulfonyl, carbamoyl, acyl, acylamido, alkylamino, arylamino or a substituted or unsubstituted alkyl, aryl or hetaryly group; or any two of said R, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.

Abstract: In order to diminish the effects of debris on recording and playback in a cartridge loaded recorder, adhesive material is placed inside the enclosed magnetic tape cartridge. The adhesive is placed on appropriate interior walls and other available surfaces of the cartridge, and is covered by a protective screen having holes through which the debris may pass. The size of the holes is large relative to the debris size. The adhesive material is located clear of the magnetic tape path, magnetic heads and guides, and if an inadvertent tape loop occurs in the cartridge, the protective screen insures that the magnetic tape cannot come into contact with the adhesive proper. Any losse debris, however, incident on the holes of the protective screen is captured and immobilized by sticking to the adhesive material.

Abstract: In a reprographic or graphic arts application halftoned latent images of a continuous tone original image are created by imagewise exposure of a photosensitive member through a pressurized screen assembly. A transparent platen supports the original with one or more lamps being provided to illuminate the original resting on the platen. The light image produced is transmitted by an optical system through the pressurized screen assembly to the image plane of a photosensitive member to create the latent image. A pressurized cell within the screen assembly prevents sagging of the screen such that in the image plane of the projected image, the spacing of the halftone imaged pattern is uniform. A single blower system is provided to supply either a negative or positive pressure for the cell, depending upon the direction of sag.

Abstract: An electrophotographic recording element having a layer comprising a photoconductive perylene pigment, as a charge generation material, that is sufficiently finely and uniformly dispersed in a polymeric binder to provide the element with excellent electrophotographic speed. The perylene pigments are perylene-3,4,9,10-tetracarboxylic acid imide derivatives.

Abstract: Copolymers are made by reacting maleic anhydride or a related compound with a 4-vinyl-1,3-dioxolane in the presence of a free radical initiator. The dioxolane reactant can be made by reacting a ketone with 3,4-epoxy-1-butene, or a substituted derivative thereof.

Abstract: A circuit element is disclosed comprised of a substrate and an electrically conductive layer located on the substrate. The electrically conductive layer is comprised of a crystalline rare earth alkaline earth copper oxide. The substrate is formed of a material which increases the electrical resistance of the conductive layer when in contact with the rare earth alkaline earth copper oxide during crystallization of the latter to an electrically conductive form. A barrier layer is interposed between the electrically conductive layer and the substrate. The barrier layer contains magnesium, a group IVA metal, or a platinum group metal, either in an elemental state or in the form of an oxide or silicide.

Abstract: Data is recorded on the film by the manufacturer prior to exposure at a first magnetic head azimuth angle. The camera magnetically records information on the film frame-by-frame at a second head azimuth angle with each exposure or shortly thereafter. Before exposure of any frame, the camera determines whether the frame has already been exposed by sensing the recorded signal amplitude at one of the two magnetic head azimuth angles. In order to prevent a double exposure, the camera transports the film past any frame having data magnetically recorded therein corresponding to the second azimuth angle.

Abstract: A novel method and apparatus is disclosed for the coating of a support or moving web using curtain coaters during the start-up and shut-down of a free falling liquid curtain. The apparatus is typically a catch pan positioned between a first and second edge guide and in close proximity to a support. The catch pan includes a main catch pan surface and first and second opposing sides each having a shim projecting out along the upper edge thereof and into contact with the first and second edge guides, respectively. Each shim strips liquids from the adjacent edge guide, and then directs such liquids onto the catch pan surface during start-up and shut-down without the deposition of excess liquids on the support, web, or coating roller. Means are provided for retracting the catch pan and controlling the falling curtain during start-up, and for inserting the catch pan for intercepting the falling curtain during shut-down.

Abstract: Disclosed is a polymer and process for producing the polymer using a complex of titanium alkoxide with an alkali or alkaline earth metal salt.