Abstract: A deflection yoke for a cathode ray tube improves assembly and productivity and enables effective control of magnetic field corrections during device processing. The deflection yoke includes a horizontal deflection coil located next to the outer circumference of a funnel to generate a horizontal magnetic field, and a vertical deflection coil installed at the outer circumference of the funnel to generate a vertical deflection magnetic field. The vertical deflection coil is insulated from the horizontal deflection coil. A ferrite core is located close to the vertical deflection coil to reduce the loss in the magnetic force generated from the horizontal and vertical deflection coils, and to enhance their magnetic efficiency. A correction unit is spaced apart from the horizontal deflection coil by a predetermined distance to correct a geometric distortion of the vertical and the horizontal deflection magnetic fields that is generated due to the vertical and horizontal deflection coils.

Abstract: A magnetic element including a first core and a second core each of which has a winding core provided with a flange portion having a flange surface at least at one end thereof; and an intermediate core disposed between said first core and said second core and being integrally connected with said first core and said second core so as to form a closed magnetic circuit.

Abstract: A convergence control apparatus for a video display is provided. In the apparatus, a convergence controller receives a vertical synchronization signal and a horizontal synchronization signal and then outputs a vertical convergence correction voltage and a horizontal convergence correction voltage. An amplifier receives and amplifies the vertical convergence correction voltage and the horizontal convergence correction voltage. A correction current generator receives the amplified vertical convergence correction voltage and the amplified horizontal convergence correction voltage and then generates a vertical convergence correction current and a horizontal convergence correction current. A switching unit controls the vertical convergence correction voltage and the horizontal convergence correction voltage according to the horizontal synchronization signal.

Abstract: An electron beam trajectory controlling device includes a main deflection section having a first main coil and defining a first path and being configured to control a trajectory of an electron traveling along the first path. The main deflection section includes a first auxiliary coil provided proximate the first main coil. A minor deflection section is provided adjacent to the main deflection section and has a first minor coil that is coupled to the first auxiliary coil. The minor deflection section defines a second electron path that is aligned to the first path. The minor deflection section cooperates with the main deflection section to control the trajectory of the electron.

Abstract: A color cathode-ray tube apparatus having: a glass bulb including a face panel, a funnel, and a neck; a deflection yoke attached to the funnel to surround thereof; and a color-selection electrode disposed inside the face panel. A pair of degaussing coils are wound around the upper and lower portions of the glass bulb, respectively. A loop coil, which is disposed around the glass bulb between the color-selection electrode and the deflection yoke, includes: a first portion including two extending portions of the loop coil positioned over and below the glass bulb respectively, each center of the extending portions being substantially in a plane perpendicular to a tube axial of the glass bulb; and a second portion including two bent portions that are formed by bending right and left sides of an original form of the loop coil toward the neck.

Abstract: A color picture tube device has a funnel glass, a pair of horizontal deflection coils, an insulating frame, and a pair of vertical deflection coils. The pair of horizontal deflection coils are opposed to each other in a vertical direction around the outer surface of the funnel glass, and each have a window at the center. The insulating frame covers the horizontal deflection coils, resembles in shape a part of the funnel glass where the horizontal deflection coils are provided, and has openings in areas corresponding to windows of the horizontal deflection coils. The pair of vertical deflection coils are opposed to each other in a horizontal direction around the outer surface of the insulating frame, without overlapping the openings. A pair of correction coils are provided so as to be each at least partially inserted in a different one of the openings.

Abstract: Sensitivity of a velocity modulation device is increased and noise such as a leakage magnetic field and a leakage electric field from the device are reduced to thereby lower power consumed by the device. A cathode ray tube device and a television set each include a velocity modulation device on a cathode side of a deflection yoke. All or part of the circumference of a velocity modulation coil to modulate scan beam velocity is covered with material having an initial permeability of at least 10 at 2 MHz.

Abstract: A transformer for cathode tube inverter. The transformer includes an iron core assembly having first, second, third and fourth iron cores, each having a U-shape, and a first wire rack having a first wire winding portion, and a first hollow portion for accommodating the first iron. The transformer further includes a second wire rack having a hollow second wire winding portion, and a second portion for accommodating the second iron core and the third iron core, a third wire rack having a third wire winding portion, and a third hollow wire portion for accommodating the fourth iron core and a primary coil is shared within the iron cores. The primary coil and secondary coils are completely isolated with respect to electric circuits, and the secondary coils are completely or mostly, as well as mutually isolated with respect to magnetic circuits.

Abstract: A deflecting yoke apparatus comprising first and second frame coils configured to correct a vertical horizontal misconvergence first and second main coils and first and second sub-coils which are wound around a core and configured to deflect in a vertical direction electron beams which have passed through a magnetic field generated by the first and second frame coils, a first deflecting current supply portion configured to pass a serriform deflecting current to the first and second main coils, and a second deflecting current supply portion configured to supply to the first and second sub-coils through a first and second diodes connected in parallel so as to have opposed directions a deflecting current which is supplied to the first and second main coils by the first deflecting current supply portion.

Abstract: A deflection yoke device includes a deflection yoke for deflecting electron beams in horizontal and vertical directions, the electron beams being emitted from an electron gun of a color cathode ray tube; coma correcting coils positioned on an electron gun side of the deflection yoke so as to be opposed to each other in such a manner that the electron beams pass therebetween; and a pair of cores around which the coma correcting coils are wound, wherein a sliding mechanism is further provided for allowing each of the coma correcting coils to be slidable with respect to the corresponding core. Therefore, a misconvergence can be corrected by a simplified configuration without reducing a sensitivity of the coma correcting coils.

Abstract: A deflection yoke has first and second horizontal deflection coils formed of a solid wire. A first bobbin and a second bobbin are formed in one-piece construction with each other. The first coil-end lead of the first horizontal deflection coil and the second coil-end lead of the second horizontal deflection coil are wound around the second bobbin to form a balance coil such that the balance coil is formed continuous with horizontal deflection coils. After the first and second horizontal deflection coils and the balance coil have been wound around the respective bobbins, the second bobbin may be separated from the first bobbin and then the second bobbin may be mounted to a desired part of the first bobbin.

Abstract: A cathode ray tube display having an in-line tube includes an electromagnetic unit for dynamically influencing the path or shape of the electron beams. The power for supplying current to the electromagnetic unit is drawn from the line deflection circuit, either through supply coil on a transformer arranged in parallel with the line deflection coil, or from a supply coil sound around the deflection unit core.

Abstract: The invention relates to a color display device comprising an in-line electron gun (5) for generating three electron beams (6, 7, 8), and a convergence unit (14′) to dynamically influence the convergence of the electron beams and deflecting means (51) for deflecting the electron beams (6, 7, 8). The convergence unit (14′) comprises a ring-shaped element (21′), said ring-shaped element comprising two parts, a first part (60) being positioned closer to the in-line gun (5) than a second part (68), and the first and/or the second part having four coils (22′) for generating a magnetic quadrupole field.

Abstract: An improved image projection lighting device is disclosed. Commands received by a communications port of the base housing may be acted upon to change zoom and focus values of a zoom and focus lens. A cooling system may be provided which compares an input air temperature of the image projection lighting device to an exiting air temperature to determine if a filter needs service. A video projector may project a first image comprised of first, second, and third separate images and the first separate image can be faded up to project light that is void of an image by a first command received at the communications port.

Abstract: A color cathode ray tube using a self-convergence method is provided with magnets for correcting top/bottom pincushion distortion, and includes a vertical deflection coil and a four-pole coil. The vertical deflection coil generates a first correction field distorted in a barrel shape. The four-pole coil is arranged on the side of a deflection yoke nearer to an electron gun, and corrects YH barrel pattern misconvergence by generating a second correction field. The strength of the second correction field varies according to the amount of vertical deflection applied to electron beams emitted by the electron gun.

Abstract: An electron beam trajectory controlling device includes a main deflection section having a first main coil and defining a first path and being configured to control a trajectory of an electron traveling along the first path. The main deflection section includes a first auxiliary coil provided proximate the first main coil. A minor deflection section is provided adjacent to the main deflection section and has a first minor coil that is coupled to the first auxiliary coil. The minor deflection section defines a second electron path that is aligned to the first path. The minor deflection section cooperates with the main deflection section to control the trajectory of the electron.

Abstract: In order to nullify the adverse effect of an external magnetic field on a static magnetic field generated in an MRI system, small-size coils are used to generate a compensation magnetic field. Thus, the component of the static magnetic field to be applied to a magnetic sensor is canceled. The magnetic sensor can therefore detect the external magnetic field highly precisely. A correction current proportional to the external magnetic field detected highly precisely is fed to BO correction coils. Eventually, the external magnetic field that adversely affects the static magnetic field is canceled.

Abstract: Horizontal line misconvergences produced at screen upper and lower portions, among rasters displayed by side electron beams are corrected without producing degradation in vertical deflection sensitivity so much and changing horizontal trapezoidal distortion. In a deflection yoke provided with a top-and-bottom pair of saddle-type horizontal deflection coils and a right-and-left pair of saddle-type deflection coils and mounted to and used in a color cathode ray tube having an in-line arranged electron gun, a pair of sub-cores is provided from side to side or above and below on the electron gun side of the deflection yoke. At least one pair of correction coils is wound around each of the pair of sub-cores.

Abstract: Color television apparatus and color monitors are provided with a device, in particular with an electron lens system, to vary the mutual spacing of the electron beams generated in an electron beam generating system. By reducing the mutual spacing between the generated electron beams, in accordance with the deflection of the electron beams, the spacing of the shadow mask to the viewing screen can be increased at an increasing distance to the center of the screen, and thereby a less expensive shadow mask design can be used without having to take the former disadvantages of a flat screen into account.

Abstract: A color cathode ray tube has quadrupole elements which increase and decrease the distance between the electron beams as a function of the deflection. Two co-operating elements have their windings connected in series with each other to minimize dissipation in the driving circuits. One driving circuit provides a common current which flows through both quadrupole elements, while another driving circuit provides a difference current to a node between the quadrupole elements.

Abstract: A color display device comprising a cathode ray tube and a deflection unit. The display device includes a compensation coil arranged circumferentially around the display tube, for example on the deflection unit, and means to supply dc current to the coil for correcting a trapezoidal distortion in the raster displayed on the screen.

Abstract: The present invention relates to a color display device comprising a color display tube (1) with a front portion having a truncated cone (3), means for generating a plurality of electron beams (5), a shielding (9) of ferromagnetic material extending substantially parallel to the truncated cone (3), and a demagnetizing device having at least two demagnetizing coils (11,12) extending along the outer circumference of the cone (3). The demagnetizing device is arranged to energize the coils(11,12) simultaneously and with a phase difference, resulting in the generation of a rotating magnetic field.

Abstract: A color CRT is driven by focusing and accelerating an electron beam emitted from a cathode by forming a plurality of electron lens including a quadrupole lens by applying a predetermined voltage to the cathode of an electron gun installed at a neck portion of a funnel and each of electrodes, focusing the electron beam on a fluorescent film by applying a voltage having a horizontal dynamic waveform having a ratio of slopes of 6.

Abstract: A convergence correction circuit including a coordinate unit which sets a predetermined range with first level values according to a screen length; an interval unit which divides the screen length; an interval decoder which calculates the value of the branch point of each interval determined by the interval unit; an interval gain unit which stores the gain of each interval; a subtracter which subtracts the output of the coordinate unit from the output of the interval decoder; a multiplier which multiplies the output of the subtracter by the output of the interval gain unit; a level shifter which sets an initial and last value of each interval upon horizontal scanning; an adder which adds the output of the multiplier and the output of the level shifter; a digital-analog converter which converts the output of the adder; and a correction coil which corrects the convergence according to the converted output.

Abstract: Color picture display device comprising a cathode ray tube and a deflection unit. The picture display device comprises compensation means for compensating picture errors. The compensation means is arranged on a side of a deflection unit facing the display screen and comprises four magnet systems which are arranged fourfold symmetrically with respect to the tube axis and extend through an angle &agr; ranging between 24 and 34 degrees or between 40 and 48 degrees.

Abstract: The invention relates to a color display device comprising an in-line electron gun (5) for generating three electron beams (6,7,8), a deflection unit (51) for deflecting the electron beams (6,7,8) and a convergence unit (14′) for dynamically influencing the convergence of the electron beams. A variable transformer (40) is connected between the convergence unit (14′) and the deflection unit (51) for compensating undesired voltages induced by the deflection unit (51). The variable transformer (40) comprises three coils (47,48,49) wound around a hollow coil holder (43) and an adjustable core (42), which moves within the coil holder.

Abstract: A deflection yoke is described for use in a cathode ray tube, which has an improved deflection sensitivity. The deflection yoke includes a ferrite core, a vertical coil to generate a vertically defecting magnetic field and a horizontal coil to generated a horizontally deflecting magnetic field. The core has a funnel-shaped body with an opening therethrough defining an inner surface. The horizontal coil includes a pair of saddle-type coils positioned in the core such that at least a portion of the horizontal coil is in contact with the inner surface of the core.

Abstract: A first magnet that generates a magnetic field having the same polarity as that generated by a vertical deflection coil during a deflection toward the upper side is provided on a phosphor screen side of the deflection coil and above a horizontal axis. A second magnet that generates a magnetic field having the same polarity as that generated by the vertical deflection coil during a deflection toward the lower side is provided on a phosphor screen side of the deflection coil and below the horizontal axis. A third magnet that generates a magnetic field having the opposite polarity to that generated by the vertical deflection coil during the deflection toward the upper side is provided on the phosphor screen side with respect to the first and second magnets and above the horizontal axis.

Abstract: An electric field expansion type main lens portion is constituted by including a focus electrode to which a focus voltage on a first level is applied, an anode electrode to which an anode voltage on a second level higher than the first level is applied, and two auxiliary electrodes to which a voltage on a third level higher than the first level and lower than the second level is applied and which are arranged between the focus electrode and the anode electrode. An electrode length of each of the two auxiliary electrodes along an electron beam traveling direction is constituted so as to differ in accordance with a difference in potential between electrodes arranged at front and rear positions in the electron beam traveling direction of each auxiliary electrode.

Abstract: A main lens is composed of a dynamic focus electrode, a first auxiliary electrode, a second auxiliary electrode and an anode, which are successively arranged in a direction of travel of electron beams. A sub-lens provided on a cathode side of the main lens is composed of a third grid, a fourth grid and a fifth grid. The first auxiliary electrode is connected to the fourth grid, and both are connected to a voltage supply terminal on a resistor near the fourth grid. A fixed focus voltage is applied to the third grid and fifth grid sandwiching the fourth grid.

Abstract: A main lens comprises a second segment G5-2, a sixth grid G6 and an additional electrode GM disposed between the second segment G5-2 and sixth grid G6. A first-level constant voltage and a second-level constant voltage are applied to the second segment and sixth grid, respectively. A third-level voltage, which is at a level between the first level and the second level, is applied to the additional electrode. In accordance with the increase in deflection amount of an electric beam, the third-level voltage varies a value expressed by ((voltage to the additional electrode)—(voltage to the second segment))/((voltage to the sixth grid)—(voltage to the second segment)). An auxiliary lens comprising lenses including a third grid G3 and a first segment G5-1 has a focusing power decreasing in accordance with an increase in deflection amount of the electron beam.

Abstract: An electron gun according to the present invention is provided with a grid having a beam aperture with a small diameter. In addition, the electron gun of the present invention is such that a second grid thereof is comprised of a plurality of grid plates each having the beam aperture. The electron gun of the present invention is such that a required grid comprising the electron gun is comprised of the grid plates each having the beam apertures. At least one grid plate among the plurality of grid plates has a beam aperture with an aperture diameter of less than 80% or less of an overall pseudo plate thickness. When compared with the case of comprising the grid with one sheet of metal, it becomes possible to provide a beam aperture with a small diameter.

Abstract: A color display device comprises an electron gun, a display screen with a curved inner surface and a flat color selection electrode as well as a deflection means. The distance between the electron beams is dynamically varied, whereby the distance in the deflection space increases as the beams are deflected in at least one direction. The reduction of the distance enables the distance between the color selection electrode and the display screen to be decreased in that direction. As a result, the curvature of the inner surface of the display window is increased, which has a positive effect on the strength and weight of the display window.

Abstract: The coils of an astigmatism corrector for an electron beam of a cathode ray tube are positioned on a flexible support. The support is disposed around the neck of the tube and positioned at least partially adjacent the back part of at least one pair of deflection coils, so as to reduce interaction of the fields produced by the astigmatism corrector with the elements of the electron gun.

Abstract: An image distortion correction circuit is provided in which a horizontal deflection current (IH) flows through horizontal correction coils (L1, L2) and a vertical deflection current (IV) flows through either of vertical correction coils (L3, L4). The vertical correction coils (L3, L4) and the horizontal correction coils (L1, L2) are wound on the same core (4). A pair of magnets (2, 3) on opposite ends of the core (4) apply a biased magnetic field from the north pole toward the south pole. The anode of a diode (D1), the cathode of a diode (D2) and a first end of a resistor (R1) are connected to an intermediate terminal (P11) through which the vertical deflection current (IV) flows. A first end of the vertical correction coil (L3) is connected to the cathode of the diode (D1). A second end of the resistor (R1) and a terminal (P4) are connected to a second end of the vertical correction coil (L3).

Abstract: A deflection yoke and a color cathode ray tube using the same therein and adapted for exact correction of misconvergence caused when horizontal positional deviations are induced between electron beams and a vertical deflection magnetic field. In the deflection yoke, two magnetic coil pairs are positioned opposite to each other horizontally in such a manner as to interpose the neck of a cathode ray tube therebetween. The first coil of the first coil pair is connected in series or parallel to the fourth coil of the second coil pair. The second coil of the first coil pair is connected in series or parallel to the third coil of the second coil pair. The coils thus connected are further connected in series to a vertical deflection coil. In this structure, the first and second electric coil pairs are so connected as to generate magnetic fields in mutually reverse directions. The two electric coil pairs in combination with a variable resistor constitute a bridge circuit.

Abstract: Raster demodulation apparatus for a raster-scanned cathode ray tube display comprises control means (400) for varying the shape of at least one scanned electron beam spot (661-663) in a direction perpendicular to scan lines of the raster. The control means (400) comprises an electro-magnet (700) for mounting on the neck of the cathode ray tube. The magnet (700) has eight pole pieces (720-790) spaced around the neck of the cathode ray tube (210). A winding (710) passes around each of the pole pieces (720-790) in succession in opposite directions so that, when an electrical current (I) is passed through the winding, adjacent pole pieces (720-790) around the neck of the cathode ray tube have different magnetic polarity to generate, within the neck of the cathode ray tube (210), a magnetic field in which magnetic lines of force (680) pass through the or each electron beam (661-663) only in a direction parallel to the scan lines of the raster.

Abstract: A color cathode ray tube has G1-G5 electrodes and an anode. The G5 electrode is divided into sub-electrodes supplied alternately with a first fixed focus voltage and a second focus voltage which is a second fixed voltage superposed with a dynamic voltage, at least one electrostatic quadrupole lens is formed between adjacent ones of the sub-electrodes, and two of the sub-electrodes are supplied with the second focus voltage. The following inequalities are satisfied: 0.0625×L (mm)≦B−20A/(3&phgr;)≦22.0 mm, L (mm)≦352 mm, where A is an axial length of the G4 electrode, &phgr; (mm) is an average diameter of a center aperture in the G4 electrode, B (mm) is a length from a cathode side end to a phosphor screen side end of said G5 electrode to the phosphor screen.

Abstract: An inline type color cathode-ray tube deflection yoke applies a deflecting magnetic field to electron beams from a neck portion of a valve accommodating three electron guns toward the funnel portion of the valve. The deflection yoke is provided with a vertical deflection coil, auxiliary coils serially connected to the vertical deflection coil, and a U-shaped magnetic member around each of both leg portions of which the auxiliary coils are wound. The U-shaped magnetic member is arranged so that the leg portions face the neck portion.

Abstract: The present invention is intended to provide a deflection apparatus which is able to effect an excellent convergence correction by improving an interference between a coma aberration correction coil and a convergence correction coil. In the deflection apparatus according to the present invention, a circuit comprising a coma aberration correction coil, resistors and a reactance means is connected to a vertical deflection coil in series. In the above-mentioned circuit, coil pair comprising the coma aberration correction coil are connected in series. One end of the reactance means is connected to a junction, i.e. middle point of the coil pair. One ends of the respective resistors are connected across the respective ends of the coil pair connected in series. Remaining one ends of those resistors are connected to a remaining one end of the reactance means.

Abstract: System for correcting an electron beam from a single cathode in an electron gun for a color CRT, in which the single electron beam emitted from the single cathode is controlled by a magnetic field generating device synchronous to an electron beam deflecting signal and a video signal applied to the cathode for realizing an optimal image, the system including a time division distributor for receiving a video signal and generating one of electron beam signals corresponding to a red, a green, or a blue fluorescent material, an electron gun with a single cathode for receiving any one of red, green, blue signals from the time division distributor and emitting a single electron beam, a deflection yoke for receiving a deflection signal and deflecting the electron beam emitted from the cathode to an entire region of a screen, a digital controller for receiving a signal from the time division distributor and the deflection signal, and a magnetic field generating device for receiving a signal from the digital controller

Abstract: An apparatus for correcting a misconvergence and geometric distortion of a deflection yoke, comprising a generally conical coil separator having a neck part and screen part, a left vertical deflection coil and right vertical deflection coil disposed respectively on the left and right portions of the outer surface of the screen part, first to sixth coma precoils disposed respectively on the left upper portion, right upper portion, left lower portion, right lower portion, left middle portion and right middle portion of the neck part via E-shaped iron pieces in such a manner that they can generate 6-pole magnetic fields, the coma precoils being electrically connected to the left and right vertical deflection coils, a distortion adjustment unit for controlling the relative amounts of current flowing respectively through the left and right vertical deflection coils to adjust a geometric distortion on a screen, a first misconvergence adjustment unit for controlling the relative amounts of current flowing respective