Abstract: Method and apparatus for use in a web transport system wherein the web is stopped at a position it occupied when an event occurs. In particular, a motor driven capstan is provided to drive a web, such as a filmstrip, between first and second reels. A tachometer, operatively coupled to the capstan motor, provides a first signal representing the actual film velocity. The first signal is applied to an integrator which is controlled in a manner whereby during normal operation of the web transport system the integrator is off and does not affect system performance. When the event occurs requesting the capstan drive motor to stop, the integrator is enabled and provides an output which is proportional to the distance traveled during deceleration of the capstan drive motor (overshoot). The output of the integrator is coupled to first summing junction whereat it is added to a signal representing the desired film velocity which is driven to zero upon occurrence of the event.

Abstract: Method and apparatus for interconnecting parallel command data in a controller and parallel status data in a controlled device by transmitting the command and status data between the controller and controlled device through serial data links. The serial data links to and from the controller pass through electromagnetic radiation filters to prevent any radiation from leaving the controller through the interconnecting command and status data lines.

Abstract: A solder levelling machine which uses a hot gas emanating from opposed gas knives to remove excess molten solder from a printed circuit board as the board is withdrawn from a bath of molten solder contained in a self-purging solder pot. The hot gas clears the through-holes in the circuit board and allows a controllable desired thickness of solder to remain on the board and in the through holes. A pair of heaters supplies the hot gas to the knives through a manifolding arrangement.

Abstract: Apparatus for producing copies of portions of an original document and at least one selectively positioned supplemental document which masks the portion of the original document not reproduced. A copier with an image receiving station is provided. A holding device positions the original document into operative association with the image receiving station. The supplemental documents are placed in a transparent over-lay which is positioned between the holder and the image receiving station. The set-up is such that the supplemental documents are in a position to be reproduced while preventing the corresponding portions of the original document masked by the supplemental documents from being reproduced. A transfer device moves the holding device in a reciprocating motion to place the supplemental documents and the original document in first and second relative positions during first and second copy cycles, respectively.

Abstract: An optical holographic memory device wherein a plurality of hologram plates, each plate comprising an array of sub-holograms, are arranged in a predetermined horizontally registered relation to one another, the amount of information recorded on the plates thereby not being restricted by the light deflecting device utilized to read a selected sub-hologram.

Abstract: A zoom lens assembly for projecting images from an object plane to the image plane at magnifications from approximately 17 times to approximately 29 times and operating in the wavelength range from 0.38 to 0.54 microns. The zoom lens assembly comprises four members, including a front fixed member, two cam controlled moving members, and a rear fixed member. A diaphragm is mounted within the rear moving member and is controlled by a third cam to maintain a constant f/number aperture at the long conjugate. In a preferred embodiment, the cams which control the movable members are designed so that equal angular rotations of the cam sleeve into which the cam slots are cut changes the magnification by equal amounts.

Abstract: Interface circuitry for effectuating the control of a printing unit that employs a cursor moving in a scanning raster to effect permanent recordation on a laminar print media, such as paper. The interface circuitry includes a buffer storage unit for receiving high speed digitized signals designating characters to be printed. Corresponding video signals are accessed within the interface circuitry and are provided to the printer. The circuit elements and timing devices define a two dimensional matrix of area locations of uniform geometry. Video signals controlling the print characteristics in a row of area locations are accessed out of memory in the interface circuitry and are serially relayed to the cursor to produce a pattern of light and dark areas in a row within the field within which the character is to be printed. Provision of video signals in this manner is repeated until the video signals have been provided for all character positions through which that row passes.

Abstract: An intensity modulated laser beam is directed to a rotating scanner having a plurality of facets which scans the beam across the surface of a movable mirror in a first scan direction. The mirror is movable in a manner whereby the beam is deflected in a second scan direction. The light reflected from the movable mirror is directed through a focusing lens onto a movable cylinder lens located adjacent the platen which is movable in a direction corresponding to the second scan direction, thereby providing two-dimensional scanning of a document. In one embodiment, the movable mirror and the movable cylinder lens are driven by a single motor and are coupled together in the manner whereby the movement thereof is mechanically interlocked thereby providing perfect tracking of the scanned laser beam within the clear aperture of the cylinder lens. In a second embodiment, the movable mirror and the movable cylinder lens may be independently driven and interlocked electronically.

Abstract: A laser system which produces multiline emissions simultaneously and which is adapted for use in optical data processing systems. In particular, in a first embodiment, a unitary positive column laser comprises two sections, the first section comprising a positive column helium-cadmium laser, the second section comprising a positive column helium-neon laser, the first and second sections being in tandem. Each section may be excited separately such that optimum excitation for red laser light, produced by the helium-neon section, and blue laser light, produced by the helium-cadmium section, can be independently controlled. The present system also allows separate cadmium vapor pressure control by separately controlling the vaporization temperature of the cadmium and also allows confinement of the cadmium vapor whereby the vapor does not contaminate one of the optical windows which confines the active laser medium.

Abstract: Method and apparatus for selectively erasing information formed on the surface of image recording device which deforms when illuminated in the presence of an electrostatic field applied thereacross. The image recording device, comprising a layered structure consisting of a conductive transparent substrate, a photoconductive layer, a deformable elastomer layer and a deformable electrode, is initially raster scanned by information containing light on the photoconductor layer with voltage applied between the conductive electrodes whereby the elastomer and deformable electrode are deformed in accordance with the input information. For selective erasure, the voltage is removed and the device is short-circuited. With the device shorted, the area to be erased is scanned with the spot of light. The short is then removed and the voltage reapplied, the remainder of the information except for the area erased, being restored. Additional information can be written in the erased area if desired.

Abstract: A radiation emission device characterized by a cylindrical cathode enclosed by an elongated envelope having a body section and two end sections is disclosed. The device includes an anode terminal, coupled to the body section, which serves to provide electrical energy to excite metallic material inside the envelope. The device further includes a pair of cataphoresis terminals located along each end section to prevent the excited metallic material from drifting into contact with radiation transmission windows located at the terminus of each end section.

Abstract: Method and apparatus for inverting the polarity of an input image formed on a surface of an image recording device which deforms when illuminated in the presence of an electrostatic field applied thereacross. The image recording device, comprising a layered structure consisting of a conductive transparent substrate, a photoconductive layer, a deformable elastomer layer and a deformable, reflective layer is raster scanned by information containing light through the photoconductor layer with voltage applied between the conductive electrodes, the elastomer and deformable electrode being deformed in accordance with the input informaton. The image projected from the surface of the deformable electrode is positive, light characters on a dark background. In order to project a negative image (dark characters on a light background), the device is initially flooded with light through the photoconductor layer with voltage applied between the conductive electrodes.

Abstract: This invention relates to a printed circuit mother board with card holders attached thereto by means of card holder pins extending through apertures in the mother board, the pins being uniformly crimped to hold them securely for presentation to a solder wave and a machine for producing such a product.

Abstract: A highly parallel microprocessor using a logic gating structure and a microinstruction organization which permits direct access by each of the microprocessor components to a tri-bus system. Operation is defined by a single phase clock, during which all portions of a microinstruction are executed. The system further permits overlap operation for microprocessor instructions, thereby allowing for the fetching of a next instruction while executing a current instruction. The use of general purpose, non-dedicated registers is contemplated, thereby to avoid the need for multi-phase clocking.

Abstract: A circuit for storing data in a random access memory containing one defective bit per word. A separate read-only memory device or programmable logic array is provided to produce an interrupt bit whenever a memory location containing a defective bit is addressed, where a defective bit is defined as one that is stuck at 1 or stuck at 0. If an interrupt bit is generated the data word is read out from memory and compared to the original. If an equality exists, nothing further is required. If there is an inequality the data word is complemented and stored, and a flag bit is set. When data is read from memory, if the flag bit is set, the data word is complemented again before being used.

Abstract: A circuit for concurrently producing regulated high-voltage a.c. current and automatically varying d.c. current on one output line, where all adjustment and regulation is accomplished in low-voltage circuits, power supply being particularly useful as the power source for copier and duplicator corotrons. The basic wave shape is a rectangular wave which is amplified and regulated for application as the a.c. input to a corotron. The corotron itself is used as the rectifier for the d.c. bias current, and while the nominal d.c. bias is fixed by adjusting the duty cycle of the rectangular wave to a fixed value, the actual d.c. bias current will vary in accordance with atmospheric conditions and paper thickness, which is desirable for the proper operation of copier and duplicator corotrons. The adjusted duty cycle of the rectangular wave determines the nominal d.c. bias current.

Abstract: A transcriber system for the automatic translation of stenographic notes from phonetic outlines produced on a shorthand machine to text displayed or printed out. The basic components of this system are the recording station comprising a shorthand machine, and a tape recorder; and the transcriber station comprising a computer, a disk file, a keyboard-display for editing the original translation into its final form, and an automatic typewriter. The editing process is facilitated by a word cursor which identifies the particular word on display which may be manipulated by the System Editor. However, this cursor also is correlated to the original shorthand machine outlines. Thus, the translation of a term peculiar to the job being processed, or to an individual shorthand machine operator, may be remembered so that subsequent correct translations of these particular outlines will proceed automatically.

Abstract: A xeroradiographic system employing both fringe field and absolute development in order to provide both enhancement of sharply changing boundaries as well as imaging slowly changing borders is provided. This is accomplished by first developing the image with a colored toner in the fringe field i.e. far spaced electroded mode and then developing the electrostatic image in the absolute mode i.e. employing a closely spaced electrode to the latent electrostatic image with a contrasting colored toner.

Abstract: Method and apparatus for reducing X-ray dosage required for xeroradiographic examinations without reducing the relative information capacity of the images produced during the examination. In particular, a charged xerographic plate is positioned adjacent the object to be examined and penetrating X-ray radiation is projected through the object onto the plate surface, forming a latent electrostatic image on the surface of the plate. The penetrating radiation utilized is of a substantially lower dosage than normally utilized. The image is then partially developed with developing powder and the partially developed image is then charged and exposed to substantially uniform radiation. The exposed charged image is finally developed by applying additional developing powder thereto resulting in an enhanced image or signal.

Abstract: A circuit for concurrently producing regulated high voltage a.c. current and bias d.c. current on one output line, where all regulation is accomplished in low voltge circuits, power supply being particularly useful as the power source for copier and duplicator corotrons. The basic wave shape is a rectangular wave which is amplified and regulated for application as the a.c. input to a corotron. The corotron itself is used as the rectifier for the d.c. bias current, with this current being variable in either the positive or negative direction by varying the symmetry of the a.c. rectangular wave. Since the part of the wave which has the shorter duration must have the higher amplitude, and current in the corotron increases with voltage, a feedback loop which controls the rectangular wave duty cycle will regulate the d.c. bias current as well.