Patents Assigned to RCA Corporation
  • Color picture tube having inline electron gun with coma correction members
    Patent number: 4730144
    Abstract: The present invention provides an improvement in a color picture tube having an inline electron gun for generating and directing three inline electron beams, comprising a center beam and two outer beams, along initially coplanar paths toward a screen of the tube. The beams pass through a deflection zone adapted to have two orthogonal magnetic deflection fields established therein. A first of the fields causes deflection of the beams in a first direction perpendicular to the inline direction of the beams, and a second of the fields causes deflection in a second direction parallel to the inline direction of the beams. The gun includes two shunts for shunting portions of both deflection fields around the outer beam paths. Each shunt comprises one magnetically permeable member having an aperture therein. Each shunt completely surrounds one of the electron beam paths.
    Type: Grant
    Filed: August 27, 1986
    Date of Patent: March 8, 1988
    Assignee: RCA Corporation
    Inventors: Arthur J. Ingle, Roger C. Alig
  • Raster distortion correction circuit
    Patent number: 4730216
    Abstract: In an apparatus for displaying the picture information of an incoming interlaced television signal in noninterlaced raster scanning display on the faceplate of a picture tube, each video line of the television signal is separated into R, G and B color component signals. Each video line is compressed, or speeded-up, at a variable rate and delayed by a variable delay time to provide a speeded-up signal that is coupled to the corresponding electron beam gun of the picture tube. Each of the variable rate and delay is controlled in accordance with information relating to distortions of the raster scanning display. In this way, distortion, such as east-west or convergence, is reduced when the speeded-up signal is displayed.
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: March 8, 1988
    Assignee: RCA Corporation
    Inventors: Robert F. Casey, Werner F. Wedam
  • Compatible wide screen television system with variable image compression/expansion
    Patent number: 4730215
    Abstract: A compressor compresses the edges of a wide screen image to provide a compressed wide screen video signal which may be displayed on a conventional 4:3 aspect ratio receiver with the compressed edge portions largely hidden from view because of receiver overscan. Complementary edge expansion restores the compressed signal to its original form for display by a wide screen receiver. The relative proportions of compression applied to the left and right edges of the wide screen images are varied to reduce the appearance of edge distortion in the compressed signal when displayed on a standard aspect ratio receiver and to reduce the appearance of loss of edge resolution in the expanded signal when displayed on a wide screen receiver.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: March 8, 1988
    Assignee: RCA Corporation
    Inventors: David L. Jose, Robert A. Dischert
  • Frequency limited resonant regulator useful in, for example, a half-bridge inverter
    Patent number: 4729085
    Abstract: In a resonant regulator power supply, a resonant circuit is coupled to a source of alternating input voltage that is controllable in operating frequency. A power transformer primary winding is coupled across the capacitive element of the resonant circuit for generating an output voltage across a secondary winding. A control circuit varies the operating frequency in a negative feedback loop to regulate the output voltage on the positive slope of the frequency characteristic curve. A frequency limiting circuit prevents the operating frequency from passing through the resonance frequency of the resonant circuit.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: March 1, 1988
    Assignee: RCA Corporation
    Inventor: Walter Truskalo
  • Dual mode television receiver for displaying wide screen and standard aspect ratio video signals
    Patent number: 4729012
    Abstract: A wide aspect ratio television system includes memories for storing and recovering a video input signal in response to read and write clock pulses, respectively. Write clock pulses are deleted to compress edge regions of a wide aspect ratio input signal and read clock pulses are deleted to restore the signal to its original aspect ratio. The pattern of deleted pulses is altered on a line-by-line basis to reduce visible artifacts of signal decimation. Dual mode receivers include provisions for controlling edge blanking, interpolation and the pattern of clock pulses deleted as a function of received signals. Wide and standard aspect ratio images are displayed without altering the width of the display raster.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: March 1, 1988
    Assignee: RCA Corporation
    Inventors: David L. Jose, Spyros W. Tsokas, Robert A. Dischert
  • Pivot actuated nutation damping for a dual-spin spacecraft
    Patent number: 4728062
    Abstract: A nutation damping control for a dual-spin satellite is provided by tilting the axis of the rotor relative to the normal spin axis of the satellite and back a half nutation period later. The tilting is in the direction of the angular momentum vector component that is transverse to the rotor's spin axis.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: March 1, 1988
    Assignee: RCA Corporation
    Inventor: Carl H. Hubert
  • Electroluminescent device and a method of making same
    Patent number: 4728581
    Abstract: An electroluminescent device includes a tin oxide electrode having a textured surface with a phosphor layer interposed between dielectric layers overlying the textured surface. The textured surface propagates through the overlying layers so as to reduce the amount of generated light trapped in the device structure and increase the output brightness of the device.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: March 1, 1988
    Assignee: RCA Corporation
    Inventors: James Kane, Mildred Ling
  • Digital scaling circuitry with truncation offset compensation
    Patent number: 4727506
    Abstract: A scaling circuit for scaling PCM signals by factors less than one includes a bit-shift and truncating circuit. Roundoff error compensating circuitry adds an offset value to the samples to be scaled by the bit-shift circuitry to compensate for errors produced by truncation without rounding. The offset values are dithered to increase the apparent resolution of the system.
    Type: Grant
    Filed: March 25, 1985
    Date of Patent: February 23, 1988
    Assignee: RCA Corporation
    Inventor: Russell T. Fling
  • Sampled data filtering system, including a crossbar switch matrix, as for a ghost cancellation system
    Patent number: 4727424
    Abstract: A sampled data filter used in a television automatic ghost cancellation system employs a single chain of cascaded delay elements and a crossbar switch matrix to implement the several different delayed sequences of samples that are used by the system to cancel several ghost signals. The rows of switch elements in the crossbar switch matrix are coupled to the individual delay elements, and the columns of the matrix are coupled to sample scaling circuitry. The scaled samples are summed to develop a psuedo-ghost signal which is combined with the input signal to cancel the ghost signal components.
    Type: Grant
    Filed: October 16, 1986
    Date of Patent: February 23, 1988
    Assignee: RCA Corporation
    Inventor: Tzy-Hong Chao
  • Display device having different alignment layers
    Patent number: 4726659
    Abstract: A display device, such as an LCD, has alignment layers made of different materials; thus one layer can have a low curing temperature so as not to cause damage to delicate organic layers, such as a color filter, during curing, while the other layer can have a larger tilt angle so as to minimize ambiguities in the liquid crystal material.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: February 23, 1988
    Assignee: RCA Corporation
    Inventors: Neal D. Conrad, Sandra K. McClelland, William R. Roach
  • Circuitry for multiplying a PCM signal by a sinusoid
    Patent number: 4727333
    Abstract: Apparatus for multiplying a sampled data signal by a sinusoid having a period which is a multiple of the sample rate includes a plurality of sample scaling means to scale the sampled data signal by factors corresponding to the sine of angle .theta. over an angular range of 90 degrees in angular increments of 2.pi. divided by said multiple. A multiplexer multiplexes the scaled samples at the sample rate to produce a signal corresponding to the sampled data signal multiplied by the sinusoid. An embodiment is described for demodulating the stereo difference signal of a BTSC sound signal with serial-bit digital processing circuitry.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: February 23, 1988
    Assignee: RCA Corporation
    Inventor: Charles B. Dieterich
  • Start-stop oscillator having fixed starting phase and minimized quiescent power dissipation
    Patent number: 4727339
    Abstract: An amplifier having a resonator coupled between input and output terminals thereof supplies a dot clock signal to a character generator in a television receiver. A feedback control circuit supplies DC bias to the resonator during blanking intervals that preceed lines of characters to be displayed to ensure a consistent starting phase for oscillations, removes the DC bias and supplies operating power to the amplifier during a portion of the active video period of each displayed line for sustaining the oscillations and automatically inhibits the supply of amplifier power at the end of each active line of characters to thereby provide three oscillator operating modes of PRIMED, RUNNING and OFF so as to minimize overall power consumption for the oscillator for each field of displayed characters.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: February 23, 1988
    Assignee: RCA Corporation
    Inventors: James H. Doty, II, Walter G. Gibson
  • Wideband balun realized by equal-power divider and short circuit stubs
    Patent number: 4725792
    Abstract: A balun comprises a one-to-two, equal-power, matched power divider having branch transmission lines whose lengths differ by 1/2 wavelength at a design frequency. The shorter of these two branch transmission lines has two 1/4 wavelength long, shorted stub transmission lines branching therefrom 1/4 wavelength apart.
    Type: Grant
    Filed: March 28, 1986
    Date of Patent: February 16, 1988
    Assignee: RCA Corporation
    Inventor: Ross W. Lampe, Jr.
  • Color solid-state imaging apparatus wherein one imager receives an image of a first color and another imager receives an offset image of the first color and a second color
    Patent number: 4725880
    Abstract: A solid-state color imaging apparatus comprising a beamsplitter for splitting an incoming light beam representative of an image into at least first and second light beams corresponding to a first color band (e.g., green) of the incoming light and the first color band and a second color band (e.g., blue) of the incoming light, respectively, and first and second solid-state imagers disposed for receiving respective ones of the light beams. The first imager is optically offset with respect to the second imager and their output signals processed so as to develop an apparently improved resolution signal for light of said first color band when compared to the signal developed for light of said second color band.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: February 16, 1988
    Assignee: RCA Corporation
    Inventor: Robert A. Dischert
  • Method of making electroluminescent phosphor films
    Patent number: 4725344
    Abstract: An electroluminescent film of an activated alkaline earth metal sulfide phosphor is produced by a method utilizing low temperatures for substrate protection and achieving excellent crystallinity and enhanced brightness. A layer of an alkaline earth metal halide and a suitable activatior is deposited on the substrate, heated to melt the halide and treated with gaseous hydrogen sulfide to form the phosphor. A precursor for the halide may be deposited on the substrate heated to melting temperature and treated with gaseous hydrogen halide to form the halide in-situ.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: February 16, 1988
    Assignee: RCA Corporation
    Inventors: Perry N. Yocom, James Kane, William E. Harty
  • Deployment system
    Patent number: 4725025
    Abstract: A plurality of indexing brackets having indexing apertures are secured to a retractable boom in spaced relation. A like plurality of indexing bulkheads are hinged to a foldable panel array (or collapsible spiral antenna) at spaced hinge axes. The bulkheads have indexing prongs which engage the indexing apertures, the brackets pullings the bulkheads therewith as the indexing apertures and prongs engage. Force contact spring motors urge the brackets and bulkheads together in the engaged state. Alignment guides align the brackets and bulkheads during engagement and disengagement of the indexing apertures and prongs.
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: February 16, 1988
    Assignee: RCA Corporation
    Inventors: Derek S. Binge, John P. Kukon
  • Automatic clamping and unclamping system
    Patent number: 4724948
    Abstract: A system for automatically clamping and unclamping objects into a carrousel having a plurality of incrementally movable carriers which support slidable trays, includes arms for unclamping a slide preventing detent and a foot for gripping the trays and sliding the trays away from the carrousel. An unclamping mechanism unclamps the objects so they can be removed form the trays. The tray is incremented to an unloaded position and a probe verifies the absence of an object. The tray then increments to a load position where another object is loaded into the tray and the clamps are automatically closed.
    Type: Grant
    Filed: July 11, 1986
    Date of Patent: February 16, 1988
    Assignee: RCA Corporation
    Inventors: John L. Adams, Dennis L. Miller
  • Method for making deaggregated phosphors
    Patent number: 4724161
    Abstract: Phosphors are coated and deaggregated by treatment with ultrasonic energy during the coating step. The phosphor aqueous dispersion is continuously passed through an ultrasonic chamber at a rate of flow so as to prevent aggregated phosphor particles from settling out and avoiding deaggregation.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: February 9, 1988
    Assignee: RCA Corporation
    Inventors: Maurice D. Coutts, Stephen S. Trond
  • Apparatus for removing a cullet of a cathode-ray tube
    Patent number: 4723979
    Abstract: A method and apparatus for heat sealing an electron gun mount, having a glass stem, into a neck of a cathode-ray tube includes a mount socket for supporting the mount within the neck and a plurality of burners for applying heat to the outside of the neck proximate the stem. The neck softens, thins and then seals to the stem, causing excess neck material that is lower than the stem, known as cullet, to be cut off. Prior to applying heat, a sleeve is disposed around the mount socket within the neck adjacent to the cullet, with a clearance between the sleeve and both the socket and the neck. A vibrating coil is attached to the sleeve for vibrating the sleeve while applying heat to the outside of the neck.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: February 9, 1988
    Assignee: RCA Corporation
    Inventors: Emil V. Fitzke, Michael A. Colacello, Jack F. Otto
  • Power conversion system utilizing multiple stirling engine modules
    Patent number: 4723411
    Abstract: A power conversion system is constructed of a plurality of identical Stirling engine modules paired off in opposed, aligned relation with their respective expansion spaces in juxtaposition. Two engine module pairs are arranged in a common plane and in mutually perpendicular relation to create a module group, with plural such module groups stacked together to provide an expanded, self-balanced system with all the modules sharing a common, centrally located thermal energy source. Each module includes a pair of compression positions operating on a common axis intersecting the displacer cylinder axis at right angles. Heat exchangers, either tubes or heat pipes, are disposed within the expansion space to transfer heat from the source to the working fluid therein, thus providing a more idealized Stirling engine cycle.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: February 9, 1988
    Assignee: RCA Corporation
    Inventors: Dilip K. Darooka, Robert W. Drummond, Jr.