Patents Assigned to Videocolor S.A.
  • Patent number: 5302927
    Abstract: Dimples or depressions are formed in a deflection coil for a CRT deflection yoke assembly by inserting a spherically shaped end of a dowel-like pin through a hole in the wall of a female arbor, to protrude into a winding cavity formed between a male arbor and the female arbor of the associated yoke coil winding machine. The pin end is inserted only partially into the cavity, for acting as a deformation in the wall of the female arbor, thereby causing convolutions of wire being wound around the cavity to overly the pin. This creates the desired dimple or depression, and controls the distribution of the wires in that area of the deflection coil.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: April 12, 1994
    Assignee: Videocolor, S.A.
    Inventors: Jean-Pierre Fourche, Eric Audoux
  • Patent number: 5258693
    Abstract: A main deflection device of a cathode ray tube generates a main deflection field to deflect an electron beam on the screen of the tube. An auxiliary deflection device located between the main deflection device and the envelope of the tube generates a corrective deflection field to correct geometry errors, for example. The auxiliary deflection device includes a ring core that has a plurality of inwardly pointing projections along the ring and a plurality of associated coils that generate the corrective field. A plurality of adjustable impedances parallels the coils.
    Type: Grant
    Filed: October 14, 1992
    Date of Patent: November 2, 1993
    Assignee: Videocolor, S.A.
    Inventors: Bruno Roussel, Laurent Jourdheuil
  • Patent number: 5223769
    Abstract: A scan velocity modulation (SVM) coil arrangement for a cathode ray tube has SVM coils arranged on a rear portion of the main horizontal deflection coils. The main horizontal coils are of the saddle type and have flat end turns at the rear of the deflection coil, lying along the surface of the picture tube. The SVM coil is placed over the flat rear end turns forward of the static convergence magnets and forward of ferromagnetic materials associated with the electron gun. The sensitivity of the SVM coil is increased to the point that the coil can be efficiently driven in a progressively scanned raster display, at twice the horizontal rate of an interleaved raster display.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: June 29, 1993
    Assignee: Videocolor S.A.
    Inventors: Bernard Priere, Jean-Pierre Fourche, Alain Dossot
  • Patent number: 5185672
    Abstract: A liner for a deflection yoke assembly for a CRT includes four substantially equally spaced inclined semicircular channel-like mounting studs, arranged about the circumference of a band-like ring about the front of the liner. Threaded sleeves are push mounted upon and ultrasonically welded to an associated mounting stud. Hollow alignment bolts are screwed into each threaded sleeve, and adjustably positioned relative to the cone of a CRT for aligning the yoke to its associated CRT.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: February 9, 1993
    Assignee: Videocolor S.A.
    Inventors: Jean Rousseau, Claude Richard
  • Patent number: 5166576
    Abstract: A deflection coil system for a picture tube has a primary deflection coil and an auxiliary deflection coil. The primary and auxiliary deflection coils are each operable to produce a respective magnetic field having a first polarity within a region defined by the coil and an opposite polarity in a second region. Each of the two coils is arranged such that part of the positive polarity field of each coil and all of its opposite polarity field, are in each case coupled to the other coil. This cancels the effects of cross coupling of the primary and auxiliary deflection coils, which are placed in proximity to each other on the same axis, for example on the neck and envelope of a television display tube. At least one of the primary and auxiliary deflection coils may be a saddle shaped deflection coil and has a flat end turn section, substantially defining the opposite polarity area. The primary and auxiliary deflection coils are overlapped on the tube over at least part of this end turn section.
    Type: Grant
    Filed: May 17, 1991
    Date of Patent: November 24, 1992
    Assignee: Videocolor S.A.
    Inventors: Bruno Roussel, Didier Thibaudin
  • Patent number: 5165614
    Abstract: To avoid the use of adhesives or notched parts when winding the non-radial layers of a cathode tube deflector, first a radial layer with a wide pitch is wound. This first radial layer then presents notches for winding the folllowing layers of the non-radial coil.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: November 24, 1992
    Assignee: Videocolor, S.A.
    Inventor: Jean-Pierre Fourche
  • Patent number: 5121028
    Abstract: A self converging deflection yoke includes saddle coils having tabs mounted on or, alternatively, spaces formed in the windings. The tabs or spaces are located intermediate a gun end and a screen end of the deflection yoke. The tabs or spaces correct misconvergence at, the 2:30, 4:30, 8:30 and 10:30 hour points of a crosshatch pattern.
    Type: Grant
    Filed: October 18, 1990
    Date of Patent: June 9, 1992
    Assignee: Videocolor S.A.
    Inventor: Marc Milili
  • Patent number: 5079531
    Abstract: A deflection yoke arrangement with geometry correction includes horizontal and vertical deflection coils for scanning a raster pattern on a phosphor screen of a cathode ray tube. A support housing suitable for positioning about the neck of the cathode ray tube contains the coils and has a front rim formed with a plurality of slots near the outer periphery. A plurality of brackets formed from magnetically permeable material are located in corresponding ones of the slots. Each bracket comprises two flat end sections joined to opposite sides of a flat central part at substantially right angles thereto. One of the flat end sections of each bracket collects magnetic flux generated by the coils and channels the flux via the central part to the other end section. The plurality of brackets shape the deflection magnetic field in the region about the front rim to provide the geometry correction.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: January 7, 1992
    Assignee: Videocolor S.A.
    Inventors: Eric Audoux, Jean-Pierre Fourche, Jean Rousseau
  • Patent number: 4554589
    Abstract: The invention concerns a process and a device ensuring the fixation on the neck of a cathode tube of the deflection yoke of the tube. According to the invention, the deflection yoke 3 is fixed after its positioning has been determined between a fixed abutment 9 which may be adjustable in position and an elastic abutment 6 which presses the yoke 3 against the abutment 9. The invention applies especially to tubes adapted to be fitted to color television receiver appliances.
    Type: Grant
    Filed: November 7, 1984
    Date of Patent: November 19, 1985
    Assignee: Videocolor S.A.
    Inventor: Ignazio Cormio
  • Patent number: 4515568
    Abstract: The invention concerns a process and a device ensuring the fixation on the neck of a cathode tube of the deflection yoke of the tube. According to the invention, the deflection yoke 3 is fixed after its positioning has been determined between a fixed abutment 9 which may be adjustable in position and an elastic abutment 6 which presses the yoke 3 against the abutment 9. The invention applies especially to tubes adapted to be fitted to color television receiver appliances.
    Type: Grant
    Filed: July 8, 1982
    Date of Patent: May 7, 1985
    Assignee: Videocolor S.A.
    Inventor: Ignazio Cormio
  • Patent number: 4417698
    Abstract: The invention refers to a process and a machine making it possible to achieve improved winding of turns of electrical wire on a cathode ray tube deflection ring. According to the invention, the machine includes three axes X, Y, Z with motor means. The winders 12 rotate around axis Z to achieve turns of winding. They are supported by a rotatable column 11 around axis X to the winding plane. The deflecting ring 15 is mounted pivotally around axis X on a fixed support 4. The machine also includes pairing means for controlling electric motor means 5, 14. It is able to perform windings of desired incline without reducing the work speed of the winders 12.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: November 29, 1983
    Assignee: Videocolor S.A.
    Inventors: Didier Pernet, Francois Pater
  • Patent number: 4364079
    Abstract: A process of analysis of convergence along two orthogonal components of the three guns in a color television tube with ganged guns involves, for example, placing an analysis slit 20 in front of the screen of the cathode-ray tube in order to observe at least three luminophore columns 15 of different colors in full width, of causing a luminous line of a single color to pass by, turning on only the corresponding gun in front of said slit, and of measuring the current in the deviator of the cathode-ray tube for which the maximum light intensity is observed through the slit, and of beginning these operations again for each of the three colors, the measured values making it possible to deduce the convergence gaps of the beams at the placement of the slit. The invention allows automatic convergence correction of the cathode-ray tube.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: December 14, 1982
    Assignee: Videocolor (S.A.)
    Inventor: Claude Pons
  • Patent number: 4319166
    Abstract: The blocking voltage of an electron gun is corrected by periodically removing an input video signal and driving a cathode with a DC stabilizing voltage. A pulse perturbation is impressed upon a control grid and the cathode momentarily conducts more heavily to exceed a predetermined threshold corresponding to the limit of a black CRT picture. A feedback loop detects a response signal from the perturbation of cathode current and stores the response signal in a memory, the latter determining the corrected blocking voltage during normal operation of the gun.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: March 9, 1982
    Assignee: Videocolor, S.A.
    Inventor: Andre Lavigne
  • Patent number: 4316127
    Abstract: Improvements to combined power supply and horizontal deflection devices in a television receiver.According to the invention, the line transformer includes a winding W.sub.1 for maintaining an oscillation circuit including the deflector Ly of the cathode-ray tube and a winding W.sub.2 which may be connected to a power supply source E through a controlled switch I.sub.2 ; the winding W.sub.1 is not effectively put into service for the sweep until a switch I.sub.3 or I'.sub.3 using a diode D'.sub.3 with a relatively long recovery time and operating in phase opposition with respect to I.sub.2 is closed, so that the temporary short-circuit of winding W.sub.1 during a sweep trace is not felt by the power supply source E.The invention mainly permits powering all the circuits of a television set from a single transformer, the line transformer.
    Type: Grant
    Filed: February 2, 1981
    Date of Patent: February 16, 1982
    Assignee: Videocolor, S.A.
    Inventor: Andre Lamoureux
  • Patent number: 4237479
    Abstract: Apparatus is disclosed for generating a blanking voltage for electron guns in cathode ray tubes, as used, for example, in color television displays. Apparatus utilizes circuitry including a video voltage amplifier having a control input. A feedback loop, connected between the junction of the cathode and video voltage amplifier output at one terminal, and the control input at the other, modifies the blanking voltage in response to samples of the cathode current taken when the video signal is zero.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: December 2, 1980
    Assignee: Videocolor S.A.
    Inventor: Andre Lavigne
  • Patent number: 4021820
    Abstract: An exposure lighthouse for use in printing screen structures for cathode-ray tubes comprising a lens assembly including a diffracting optical element, a main intensity-correction filter and a supplemental intensity-correction filter in series with the main filter. Both of the filters comprise preformed carbon particles in a light - transmitting binder.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: May 3, 1977
    Assignees: RCA Corporation, Videocolor S.A.
    Inventors: Thomas Louis Chase, Dino Duranti, Renato Sassoli