Abstract: A color picture tube device in which a lens is generated in an area through which a plurality of electron beams pass, so as to be positioned, in a tube axis direction, between a phosphor screen and an end of a core nearest the electron gun. The lens has a horizontal focusing effect that focuses each of the electron beams in the horizontal scanning direction. Furthermore, an interval between at least the two outermost of the plurality of electron beams is adjusted, so that the interval at a time of the electron beams entering the lens widens as the degree of horizontal deflection by a horizontal deflection coil increases.

Abstract: A deflection yoke is provided for a CRT, which includes horizontal and vertical deflection coils that deflect electron beams emitted from an electron gun in a horizontal or vertical direction, a ferrite core that reduces a loss of magnetic force caused by the horizontal and vertical deflection coils thereby enhancing magnetic efficiency, and a holder that holds the horizontal deflection coils, the vertical deflection coils, and the ferrite core at required positions, and provides insulation between the horizontal deflection coils and the vertical deflection coils. The horizontal and/or vertical deflection coils have a substantially rectangular shape on a screen side, and the ferrite core is circular or elliptical. This reduces material costs and reduces convergence and distortion errors, because a dimensional distribution of an inside surface area of the ferrite core is reduced with respect to related art deflection yokes, and polishing of an inside surface becomes easier.

Abstract: A color cathode-ray tube apparatus has a compensation mechanism for generating a magnetic field that compensates a change in a horizontal-deflection magnetic field due to a change in the temperature of horizontal-deflection coils. The compensation mechanism is formed of auxiliary coils to which a current is supplied in synchronism with horizontal deflection of electron beams, and a control element for controlling the current supplied to the auxiliary coils in accordance with a change in the temperature of the horizontal-deflection coils.

Abstract: The invention provides a deflection yoke device comprising a main yoke portion 4 for deflecting an electron beam emitted by an electron gun, and a convergence yoke portion 5 for adjusting the convergence of the electron beam. The convergence yoke portion 5 comprises an annular convergence core 53, a convergence horizontal coil 51 wound around both of left and right two regions of the core 53 which intersect a horizontal axis, and a convergence vertical coil 52 wound around both of upper and lower two regions of the core 53 which intersect a vertical axis. Short-circuited coils 54, 54 are provided around the respective left and right two regions of the core 53.

Abstract: A deflection yoke includes a coil separator having a screen portion, a neck portion, and a connection portion, and having at least one protrusion formed on at least one of the screen portion and the neck portion, a horizontal deflection coil disposed on an inside of the coil separator to generate a horizontal magnetic field, a vertical deflection disposed on an outside of the coil separator to generate a vertical magnetic field, and having a pin hole formed on a position corresponding to the at least one protrusion coupling the vertical deflection coil to the coil separator.

Abstract: A deflection yoke mounted on a rear portion of a cathode ray tube (CRT) to deflect an electron beam emitted from an electron gun of the CRT includes a coil separator mounted on the CRT, a horizontal deflection coil mounted on an inside of the coil separator, having a first section generating a horizontal deflection magnetic field deflecting the electron in a horizontal direction and having a first radius, having a second section generating a magnetic field to weaken the horizontal deflection magnetic field and having a second radius different from the first radius, a vertical deflection coil mounted on an outside of the coil separator and generating a vertical deflection magnetic field deflecting the electron beam in a vertical direction, and a ferrite core covering a portion of the vertical deflection coil to strengthen the horizontal deflection magnetic field and the vertical deflection magnetic field.

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 pair of magnets of which magnetizing direction differs from each other in the horizontal direction (X axis) are arranged at upper and lower portions of a funnel-side opening portion of a deflection yoke. The pair of magnets are held and fixed to a coil support body which supports horizontal deflection coils in a state where the magnets are embedded in the coil support body. In a projection type cathode ray tube of a single electron beam method, a locus of an electric beam which receives the deflection distortion is corrected so as to correct an electron beam shape on a screen to an approximately circular shape whereby a focusing performance of a display image on a screen is enhanced.

Abstract: A deflection yoke attached to a cathode ray tube to deflect an electron beam generated from an electron gun includes a coil separator having a horn shape and electrically insulating deflection coils, a horizontal deflection coil having a pair of upper and lower coils disposed on an inside of the coil separator to generate a horizontal deflection magnetic field to deflect the electron beam in a horizontal direction, a vertical deflection coil having a pair of right and left coils disposed on an outside of the coil separator to generate a vertical deflection magnetic field, having a deflection coil portion and a bent coil portion extended from the deflection coil portion to generate a magnetic field, which is in an opposite direction to another magnetic field generated from a portion of the deflection coil portion disposed adjacent to the bent coil portion and weakens another magnetic field generated from the deflection coil portion, and having a vertical radius and a horizontal radius, which is different from

Abstract: A cathode ray tube deflection yoke is provided wherein the deflection yoke includes a plurality of deflection coils. One or more of the deflection coils have a non-constant distribution of turns, whereby an electron beam passing through the deflection yoke is deflected by a magnetic field that varies according to different numbers of turns relative to position of electrons of the electron beam between the entrance and exit of the deflection yoke. The non-constant turns distribution may be linear or non-linear, may be monotonic or non-monotonic, and/or may have a positive or negative turns bias, either in whole or in part. The horizontal deflection coil and/or the vertical deflection coil, or both, may have a non-constant turns distribution.

Abstract: Disclosed is a rectangular-shaped deflection yoke (what is called RTC (Round Core Tetra Coil Combined Deflection Yoke) for enhancing deflection sensitivity of a cathode-ray tube.

Abstract: The present invention provides a deflection yoke having function of compensating for pin distortions in a middle portion in order to improve pincushion in the middle portion by arranging magnetic element of reverse direction on a diagonal of a screen portion of a coil separator in the deflection yoke. According to the present invention, an additional circuit is not required as it is in a related art, for suppressing pincushion phenomenon in the middle portion on the screen, so production cost could be reduced and power dissipation could be lowered, for the circuit for suppressing pincushion is not used.

Abstract: Disclosed is a deflection yoke comprising: a fastening band of a ring shape assembled on an outer periphery of a neck portion in a coil separator by a fixing manner, provided for being extended and contracted; a pair of flanges bent and extended from both ends of the fastening band, on which a through hole is formed; a yoke clamp for generating fastening force by tightening of a bolt for passing through a pair of through holes, then being tightened by a nut; a bending portion projected on an outer side along the periphery of the fastening band, whose object contact plane for coming in contact with an outer periphery of the neck portion is divided into at least two or more.

Abstract: In a semi-toroidal deflection yoke, a middle point CL(M) of an entire length along a tube axis from a large-diameter portion to a small-diameter portion of a magnetic core lies on a small-diameter portion side of a horizontal deflection coil relative to a point lying at a distance of 0.41×HL along the tube axis from a large-diameter portion of the horizontal deflection coil, where HL is an entire length of the horizontal deflection coil along the tube axis. The deflection yoke deflects electron beams efficiently, reducing the deflection electric power the deflection yoke requires. A cathode ray tube provided with the deflection yoke can suppress pincushion type distortion which may occur in the vertical direction of a screen, and can therefore display images of satisfactory quality.

Abstract: A deflection unit for a cathode ray tube comprises a coil support (5). On its inner surface the coil support 5 comprises protrusions (34) having reference planes in the x-y direction. The coils provided on the inner side of the coil support have lying front flanges (8,9) which have corresponding reference surfaces (31), also extending in the x-y plane, preferably in an inner winding window (51).

Abstract: A cathode ray tube with a central axis includes a panel with an inner phosphor screen and a rear portion. A funnel is connected to the rear portion of the panel. The funnel sequentially has a body with a large-sized end and a small-sized end, and a cone portion with a large-sized end and a small-sized end. The large-sized end of the body is sealed to the rear portion of the panel. The small-sized end of the body meets the large-sized end of the cone portion at a point. The meeting point of the body and the cone portion becomes an inflection point of the funnel. The cone portion has a sectional shape varying from a circle to a non-circle like a rectangle while proceeding from the small sized end to the large sized end such that the cone portion is provided with a curvature radius Rh in the horizontal axis direction, a curvature radius Rv in the vertical axis direction, and a curvature radius Rd in the diagonal axis direction.

Abstract: The present invention intends to provide a cathode ray tube capable of preventing a rise in temperature of the deflection yoke efficiently, without increasing the size of a display device. To do so, in the cathode ray tube of the invention, a part of a heat radiator, which is made up of filaments, is attached to a cone part of a horizontal deflection coil so that heat is exchanged between the heat radiator and the horizontal deflection coil, while the other part of the heat radiator extends outside of the deflection yoke. The heat radiator is formed from a plurality of copper wires arranged in parallel to each other in the form of a strip. The copper wires are 0.24 mm in diameter and coated with insulation.

Abstract: The present invention discloses a cathode ray tube including a deflection yoke which can remarkably decrease a leakage magnetic field. In the deflection yoke, a diameter of an end of a ferrite core to a screen side is 50% to 85% of a diameter of an end of a horizontal deflection coil to the screen side, and an interval between the end of the horizontal deflection coil to the screen side and the end of the ferrite core to the screen side is 27% to 50% of a length of the horizontal deflection coil in a tube axis direction. As a result, the cathode ray tube can overcome problems of general cancel coils, and reduce the leakage magnetic field even at a high deflection angle.

Abstract: The present invention relates to a deflection yoke comprising a coil separator having a plurality of connection projections which are formed in the front/rear and left/right sides of a lower flange surface of a peripheral surface and which include protrusions on both sides and a central portion between the protrusions being as high as the flange surface; a ferrite core installed to form a magnetic field on the peripheral surface of the coil separator; a vertical deflection coil positioned with the ferrite core on the peripheral surface of the coil separator; a horizontal deflection coil provided inside the peripheral surface of the coil separator; a front cover having a groove being provided on both sides to be connected to the connection projection of the coil separator, and a connection hook formed to prevent a flow to the front, rear, left and right sides by having a central portion between the grooves to be connected with the flange surface of the coil separator; and a rear cover being positioned on the u

Abstract: The invention therefore refers to a color picture tube and to a deflection system for a color picture tube having a rectangular luminescent screen and an inline electron beam generation system. An inline electron beam generation system generates a plurality of electron beams substantially extending in a common plane, said electron beams being directed towards the luminescent screen. Correction magnets are arranged on the color picture tube and in the deflection system of a color picture tube, respectively, to correct a vertical green bending in the corners of the luminescent screen. The correction magnets are arranged substantially in a plane perpendicularly to the direction of the electron beams. Within this plane, the correction magnets are arranged at an angle to the common plane in which the electron beams extend which is between 20° and 70°.

Abstract: A deflection yoke having a capability of correcting a lateral inner pincushion distortion with a magnetic field generated by a deflecting coil itself is provided. The deflection yoke includes a saddle-type vertical deflecting coil including a screen side bend portion, a neck side bend portion and a cone portion connecting the screen side bend portion and the neck side bend portion and is installed to a cathode ray tube. When viewing the screen side bend portion of the vertical deflecting coil from a screen side of the cathode ray tube in a direction along the tube axis, a distance between the screen side bend portion and the tube axis is the minimum at a portion close to a diagonal direction of the screen. As a result, the lateral inner pincushion distortion can be corrected with a magnetic field generated by the deflecting coil itself with a simple configuration, without adding any component for correcting the distortion and increasing a deflecting power.

Abstract: A color cathode ray tube has an electron gun including a cathode structure for emitting three electron beams, a first electrode serving as a control electrode, a second electrode serving as an accelerating electrode and plural focus electrodes and an anode arranged in the order named, a phosphor screen composed of repeating patterns of three-color phosphor elements, a color selection electrode positioned the electron gun and the phosphor screen. The following inequalities are satisfied. {(L+1360×D−600)/280}2+{(P−0.16)/0.06}2≦1, L+1360×D≧600, and P≧0.

Abstract: Deflection yoke for a cathode ray tube including horizontal and vertical deflection coils for deflecting electron beams emitted from an electron gun in a horizontal or vertical direction, a ferrite core for reducing a loss of a magnetic force generated at the horizontal and vertical deflection coils to enhance a magnetic efficiency, and a holder for fixing the horizontal and vertical deflection coils and the ferrite core to preset positions, and insulating between the horizontal deflection coils and the vertical deflection coils, wherein the ferrite core includes a main ferrite core with a curved surface and supplementary ferrite cores each with a planar surface fitted to the main ferrite core, thereby maintaining advantages of the rectangular core of improving a deflection sensitivity compared to the circular ferrite core, and permitting easier grinding on an internal surface compared to the rectangular ferrite core, to improve a distribution of inside surface dimensions.

Abstract: Deflection yoke for cathode-ray tubes with a north/south geometry correction comprising a pair of horizontal deflection coils (3)and a pair of vertical deflection coils (4), the two pairs being isolated one from the other by a separator (2), a ferrite ring (5) at least partly covering the deflection coils and having a flared front part, the deflection yoke comprising in its front region at least one pair of magnetic means to modify locally the magnetic field in the said front region and to correct the geometry of the image created on the screen of the tube, the magnetic means being placed in the space in such a way that, for a plane (P) containing the longitudinal axis (Z) of the deflection yoke and the axis of symmetry (Y) of a magnetic means, and for the point M of the plain (P) corresponding to the point of minimum coordinates of the said means, the intersection of the ring with (P) is at least partly in its front part, located outside the region delimited by the half line (D1) passing through M and perpen

Abstract: A depression in the windings of a horizontal coil at a predetermined location in a deflection yoke of a cathode ray tube corrects for multiple types of mis-convergence. In particular, the depression in the windings is disposed in a “neck” portion of the deflection yoke, which incorporates a horizontal deflection coil disposed on a saddle type mold die. A deflection yoke for deflecting electron beams of a color CRT includes a horizontal deflection coil disposed on a saddle type mold die that has a funnel section and a neck section connected along a horizontal axis parallel to the centerline of the deflection yoke. A portion of the neck section of the deflection yoke includes an offset relative to the profile (relative to the horizontal axis) of the windings of the horizontal coil that creates a depressed area in the windings of the horizontal deflection coil.

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. In this color picture tube device, a pair of correction coils are provided so as to be each at least partially inserted in a different one of the openings.

Abstract: A clamp unit which brings respective vertical and horizontal cores and bias magnets of a magnetic current modulator into close contact with each other in the core arrangement direction is provided to a resin casing of the magnetic current modulator. Due to such a constitution, the generation of an uncomfortable sound derived from a magnetic distortion of cores of the magnetic current modulator incorporated in a deflection unit can be prevented.

Abstract: The present invention relates to a deflection unit for mounting on an in-line type cathode ray tube comprising a coil body including grooves for receiving wound coil wires, the grooves extending substantially in a straight line. The groove extension of at least one groove is changed at at least one location such that the coil wires received in the groove become curved in the area of the changed groove extension. In a preferred embodiment the grooves are separated from each other by groove walls which in the area of the changed groove extension comprise a thickening and optionally a bulge. The coil wires wound onto the coil body form the horizontal coil or the vertical coil. The arrangement serves the selective fine adjustment of the deflection fields for eliminating convergence, coma and/or geometry errors.

Abstract: A deflection yoke for a Braun tube includes a primary 4-pole convergence yoke adapted to be positioned at a neck portion of a funnel of a Braun tube and a secondary 4-pole convergence yoke positioned in the vicinity of the funnel where horizontal and vertical deflection coils and a ferrite core are installed, for correcting a misconvergence generated due to the primary 4-pole convergence yoke, wherein at least one of the vertical and the horizontal deflection coils is wound at a first holder, and the secondary 4-pole convergence yoke is installed as an auxiliary coil wound on at least one side of the inner side or the outer side of the first holder. With this construction, occurrence of an inverse-magnetic field due to an induced magnetic field is prevented and thus a misconvergence can be easily corrected.

Abstract: A cathode-ray tube comprising an electron gun (4) disposed in the neck portion (3) of a funnel (2), a deflection yoke (5) having a horizontal deflection coil (51) and a vertical deflection coil (52) mounted on the outer surface of the funnel (2) in a position closer to the front panel than the electron gun (4), and a speed modulation coil (6) mounted on the outer surface of the neck portion (3). The speed modulation coil (6) is so disposed that the end part thereof on the front panel side is closer to the electron gun (4) than the end part of the horizontal deflection coil (51) facing the electron gun (4) and closer to the front panel side the end part of the electron gun (4) facing the front panel. A desired speed modulation effect can be attained because the speed modulation magnetic field (28) of the speed modulation coil (6) does not interfere with the deflection magnetic field and can be prevented from disappearing by causing by causing an eddy current in a top unit (27).

Abstract: A color display device having 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, preferably to decrease a distance (p) between the electron beams. The convergence unit (14′) includes a ring-shaped element (21′) having coils (22′) formed by electrically conductive wires, which have been toroidally wound in a winding direction and according to a winding density distribution N (&phgr;) given by N (&phgr;)=N0 cos (2&phgr;)+C where &phgr; is an angle enclosed by the X-direction and a line between an element of the coil and the center, which ranges between 0° and 360°, N0 is a given winding density, the sign of N (&phgr;) denotes the winding direction, and C is a constant different from zero, and preferably equal to −N0.

Abstract: In a cathode ray tube apparatus, an electron beam generating section for generating electron beams is composed of a cathode and a plurality of electrodes. Two electrodes of the plurality of electrodes are connected to each other via a resistor. A constant voltage is supplied from the outside of the tube to the one electrode, and a voltage dynamically changed in synchronism with a deflection magnetic field is supplied to an electrode adjacent to the other electrode. Therefore, the shape of a beam spot can be improved, and the resolution of the entire screen can be improved without requiring extensive provision of a lead wire of a stem.

Abstract: The present invention relates to a cathode ray tube having a deflection yoke including a circular ferrite core and a deflection coil whose cross-section is in a rectangular shape for improving a deflection sensitivity of the cathode-ray tube, and more particularly to a cathode ray tube, in which one part of a vertical deflection coil having a rectangular shaped cross-section to improve a lead-in capability when winding the vertical deflection coil located between a ferrite core and the holder is separated by a predetermined gap from a holder that isolates a horizontal deflection coil and the vertical deflection coil

Abstract: A color cathode ray tube comprises a panel which outside surface is flat and inside surface has curvature, and a pressed shadow mask having a curved surface opposed to the panel inside surface. The curved surface of the shadow mask is such that the radius of curvature decreases approximately linearly as the position moves from the center to the periphery. Radii of curvature on the major axis, minor axis, and diagonal axis at positions having the same distance from the shadow mask center do not have large differences. This configuration can increase the mechanical strength of the shadow mask.

Abstract: To realize an energy-efficient color cathode-ray tube, deflection power requirement is reduced for a deflection yoke that includes one or more bend-up-less saddle type coils in at least one of a horizontal deflection coil and a vertical deflection coil, without changing a basic setting. To do so, a protruding part is provided which protrudes towards an electron gun at an electron gun-side bend part of a horizontal deflection coil of a bend-up-less saddle shape. Each side of the protruding part, in a direction perpendicular to the tube axis, is located at a point so that a vertical line drawn from the point to a tube axis forms an angle &agr; of 10° to 50° inclusive with a vertical plane.

Abstract: The present invention refers to a deflection unit for mounting on a color cathode ray tube, an associated tube and a corresponding display apparatus. The deflection unit comprises a pair of coils for vertical deflection and a pair of coils for horizontal deflection. At least one of the pair of coils is subdivided into at least two parts, of which one part is intended for the correction of convergence errors and the other part for the correction of geometry errors. The respective corrections can be carried out independently of the respectively other correction. According to a preferred embodiment the parts are spatially separated and mechanically independent, with the part intended for geometry error correction being positioned closer to the screen of the picture tube. Preferred is the use of an in-line type arrangement of the saddle-saddle or saddle-toroidal type.

Abstract: The present invention relates to a deflection unit for mounting on a color cathode ray tube. The deflection unit comprises a coil body for a vertical deflection coil and a first and second means for displacing the coil body into a first and second direction. The first and second directions are offset by 90° and are positioned in parallel with the screen plane of the color cathode ray tube. In a preferred embodiment of the invention the first and second means respectively comprise displacement bow members which can be displaced by means of a screw. The screws are preferably identical. To secure the Z-position, the coil body is preferably slid into a cap and rotated in the stop position.

Abstract: In a deflection yoke for a braun tube deflecting an electron beam radiated from an electron gun to a screen and including a horizontal deflection coil, a vertical deflection coil and a ferrite core, the horizontal deflection coil is installed inside a funnel, the ferrite core is installed outside of the funnel, the vertical deflection coil is installed inside or outside of the funnel, accordingly the convergence and deflection sensitivity of an electron beam can be easily compensated, the deflection sensitivity of a braun tube can improve, and the degree of freedom in designing the deflection yoke and an electron gun related to enlarging a diameter of the electron gun can increase.

Abstract: A deflection yoke for deflecting electron beams of a color cathode ray tube includes a saddle type horizontal deflection coil, which has a front bend section and a neck bend section. The neck bend section includes a pair of openings in the winding distribution. Each of the openings is disposed at a disposition angle relative to a horizontal axis through the neck bend section of approximately ten degrees and at a predetermined distance from a center of the neck bend section within a range from approximately three millimeters to approximately fifteen millimeters. Each of the openings has a substantially triangular shape, trapezoidal or semicircular shape. A resulting XH and HCR mis-convergence curve of the deflection yoke of the present invention passes through the origin, thereby making it possible to simultaneously correct both XH and HCR mis-convergence to zero.

Abstract: A deflection yoke of Braun tube having a horizontal deflection coil for horizontally deflecting electron beams radiated from an electron gun, a vertical deflection coil for vertically deflecting the electron beams, and a holder inserted between the horizontal and the vertical deflection coils for mechanically fixing them and electrically insulating them, including: an auxiliary coil having a first deflection portion coil extendedly formed from a ‘3-o'clock’ position of a neck side to a ‘3-o'clock’ direction of a screen side on the basis of the lengthy direction of the deflection coil; a first flange coil extendedly formed for a predetermined length from a ‘3-o'clock’ position of the screen side to a ‘12-o'clock’ direction of the screen side; a second deflection portion coil extendedly formed for a predetermined length from a ‘12-o'clock’ position of the screen side to a ‘12-o'clock’ direction of the neck side

Abstract: A deflection yoke for CRTs, designed to easily correct a misconvergence in a vertical direction of a frame without being rotated during a frame correction step, is disclosed. The deflection yoke has a coil separator composed of a screen part, a rear cover part and a neck part. A plurality of horizontal and vertical deflection coils are set on the internal and external surfaces of the coil separator and generate horizontal and vertical deflection magnetic fields. A correction means is provided on the rear cover part of the coil separator and corrects the vertical magnetic field in addition to frame dispersion. A position adjusting means is provided at a position between the rear cover part and the correction means and holds the correction means on the rear cover part while allowing the position of the correction means relative to the rear cover part to be finely and precisely adjustable. This deflection yoke precisely and stably corrects both the frame dispersion and the vertical magnetic field.

Abstract: A deflection yoke including a separator for holding a horizontal deflection coil and/or a vertical deflection coil, wherein the separator is formed by a combination of a separator main body formed into an approximately funnel shape similar to the contour of the horizontal deflection coil or the vertical deflection coil, and an approximately cylindrically shaped neck portion, formed separately from the separator main body, for holding the horizontal deflection coil and the vertical deflection coil on a neck of a cathode-ray tube. The deflection yoke is simpler in shape and easier to assemble.

Abstract: A color picture tube device that can adjust convergence without causing increases in cost and in power consumption is provided. One pair of magnetic flux generation means for generating a static quadrupole magnetic field are positioned above and below an area where a plurality of electron beams pass through. The static quadrupole magnetic field has an effect of adjusting convergence in a horizontal direction. In this construction, a magnetic flux generated by one of the two magnetic flux generation means that is closer to the plurality of electron beams is reduced, in sync with deflection of the plurality of electron beams in a vertical direction.

Abstract: The disclosed cathode-ray tube has a pyramidal yoke mounting part defined to extend from a joint with the neck to at least the end of a deflection yoke on the side of the screen, the yoke mounting part including: an inside profile having a form protruding towards a tubular axis in the direction of major and minor axes based on a diagonal axis so as to have a functional relation with a deflection angle; and an outside profile having a rectangular form with respect to the major and minor axes, the outside profile having a ratio of a maximum thickness to a minimum thickness on the same axis being either of the minor or major axis in the range from 1.0 to 1.5. It satisfies a relation 0.7<Rov/Roh≦1.0, wherein Roh is a radius of outer curvature in the direction of the major axis and Rov is a radius of outer curvature in the direction of the minor axis.

Abstract: Apparatus for displaying video images including a vacuum envelope which includes a neck portion and a display screen and an electron gun system. The electron gun system producing at least one electron beam, which in response to a magnetic field converges the at least one electron beam onto the display screen causing video images corresponding to the at least one electron beam to be displayed thereon.

Abstract: The invention relates to a deflection yoke (10) for a cathode ray tube (14) in which the energy for deflection is reduced. This is done by providing a magnetic material (56) in voids (52,54) that occur between the ferrite core (10) and a set of frame coils (18). The magnetic material (56) is comprised in a preformed insert (90), which may further comprise a rubber or plastic material. This results in a clean method of adding the magnetic material.

Abstract: A cathode ray tube (1) having an improved deflection unit (11) is described. The deflection unit (11) comprises line and/or frame coils that comprise a composition of wires having a conductive coating and wires having a non-conductive coating. Such deflection units have a good anti-ringing performance, while the good adhesion characteristics of non-conducting coated wires are maintained.

Abstract: A deflection unit (4) includes a saddle-shaped deflection coil (30). The deflection coil includes at either the front or rear end a concave part having a left and right corner (41, 42) which define a line (43). The concave part is flanked at either side by adjacent portions (38, 39). It holds that: &agr;>&bgr; where &agr; angle between a line (43) through the two corners (40, 41) of the concave part (40) and inner windings of the concave part (40), and &bgr; is an angle between said line (43) and the inner windings at the outer side of a corner (41,42).

Abstract: In a color display tube including an envelope including a front panel and a funnel, and an electron gun provided in a neck portion of the funnel, a horizontal outer diameter of the neck portion in a region on a rear end side is greater than a vertical outer diameter thereof in this region and a horizontal outer diameter thereof in a region on the front panel side, and a main lens of the electron gun is formed in the region on the rear end side. With this configuration, it is possible to achieve both an electric power saving and a high resolution in a display screen in a color display tube device, as well as to mount a deflection yoke in the color display tube easily.

Abstract: The present invention relates to a deflection yoke. According to the invention, in particular, anti-release means is provided in upper hook pieces formed in sides of a rear cover thereby preventing a printed circuit board from easy separation from the rear cover in fixing therebetween so that the assembling ability and productivity can be enhanced.