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: It is an object to obtain a cathode ray tube having a high resolution without decreasing electron emission property. Surface of a cathode was leveled by heating during forming a vacuum in order to oxidize a carbonate salt to an oxide as an electron emissive material, after applying a paste for printing on a metal substrate by screen printing, drying the same, and incorporating an oxide cathode in a cathode ray tube, the paste having a mixture of needle-like particles of the first group and bulk particles of the second group incorporated as an alkaline earth metal carbonate forming an electron emissive material layer.

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, preferably to decrease a distance (p) between the electron beams. The convergence unit (14) comprises a ring-shaped element (21) having four coils (22) and a longitudinal axis (24). A cross-section of the ring-shaped element (21) with a plane perpendicular to the longitudinal axis (24) is a circle with the longitudinal axis as its center and the ring-shaped element (21) forming the circumference. Each coil extends over the circumference over an angle &phgr; having a value between 50° and 75°.

Abstract: The invention relates to a deflection unit (10) for cathode ray tubes in which the external magnetic stray fields are further reduced and the sensitivity of the line deflection coils (17) is increased. This is done by applying a (preferably plastic deformable) magnetic material (56) in the first void spaces (52) between the wire strands (50) of the field deflection coils (18) and/or the second void spaces (54) between the field deflection coils (18) and the yoke ring (22). The plastic deformable magnetic material (56) can be additionally used for adhering the yoke ring (22) to the field deflection coils (18).

Abstract: A deflection yoke mounted on a neck of a cathode ray tube includes a pair of horizontal deflection coils, a pair of vertical deflection coils and a core of a ferromagnetic material. The core has magnetic reluctance, in a front region, close to a screen end of the tube, that is greater along the vertical direction than along the horizontal direction. In one embodiment of the invention this feature is achieved by making recesses at the intersection of a flared front part of the core with the horizontal plane of symmetry XZ. In another embodiment of the invention, the thickness of the core varies.

Abstract: An image distortion correcting device with reduced cost and reduced consumption power is provided. Horizontal correction coils (L1) and (L2) are wound around partial cores (4a) and (4b). The two horizontal correction coils (L1) and (L2) are wound in such winding directions that they produce magnetic fields in opposite directions. A bobbin (5) having an insulating property covers the partial cores (4a) and (4b) and magnets (2) and (3) in the winding direction of the horizontal correction coils (L1) and (L2), and a vertical correction coil (L3) is wound on the bobbin (5) around the partial cores (4a) and (4b) along the windings of the horizontal correction coils (L1) and (L2). That is to say, the vertical correction coil (L3) is wound over the horizontal correction coils (L1) and (L2) along the periphery of their windings with the bobbin (5) interposed therebetween.

Abstract: In a color cathode ray tube having a flat panel exterior surface, the screen distortion and the convergence give rise to problems. To overcome these problems, by arranging bar magnets in such a manner that they are disposed parallel to a screen and are shifted from upper and lower ends of a horizontal deflection coil of a deflection yoke by not less than 10 mm in the direction perpendicular to a tube axis, the distortion of the screen and the characteristics of the convergence can be simultaneously improved.

Abstract: The present invention relates to a deflection yoke which includes an iron plate on a neck portion of a coil separator to convert PQH from a negative tendency to a positive one so that degradation of convergence features can be prevented. The deflection yoke of the invention comprises: a coil separator including a screen portion coupled to a screen panel of a CRT, a rear cover, and a neck portion extended from the central plane of the rear cover to be coupled to an electron gun portion of the CRT; horizontal and vertical deflection coils provided in the inner and outer sides of the coil separator to form horizontal and vertical deflection magnetic fields to control an electron beam; and compensating means provided in the neck portion of the coil separator to compensate convergence on a screen.

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 vacuum envelope of a cathode ray tube includes a face panel having a phosphor screen formed on the inner surface, a funnel joined to the face panel and having a yoke-mounting section, and an electron gun for emitting electron beams toward the phosphor screen. A deflection yoke mounted on the yoke-mounting section of the funnel has a first open end portion positioned on the side of the phosphor screen, and a correcting coil for correcting the positional deviation of the displayed image in a rotating direction is arranged at the first open end portion. The correcting coil is formed substantially rectangular to conform with the cross sectional shape of each of the yoke-mounting section and deflection coils of the deflection yoke.

Abstract: An electron beam deflection device for a cathode ray tube in which the power for deflecting an electron beam may be reduced easily and convergence may be adjusted easily. The electron beam deflection device has a horizontal deflection yoke and a vertical deflection yoke which are arranged at different positions relative to each other in the fore-and-aft direction. A first core constituting the horizontal deflection yoke is of a flat annular shape. The upper and lower inner surfaces of the first core operate as opposing magnetic poles. A second core constituting the vertical deflection yoke may be of a flat annular shape or of a circular or square annular shape. The forward or rear end of the first core or the forward or rear end of the second core is provided with a cut-out for adjusting the convergence.

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: 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: A neck portion (3) formed in the subterminal portion of the narrower diameter side of the funnel shaped separator, has holding portions (32a, 32b) and upper holding portion (33a, 33b) to hold magnetic rings (10, 11, 20, 21). The protrusions (80a, 80b) formed in the neck portion (3) have slope side (80a1, 80b1). Upon the insertion of the magnetic rings (10, 11, 20, 21) to the neck portion (3) from the narrower diameter side thereof, the magnetic rings (10, 11, 20, 21) contact the slope sides (80a1, 80b1) before they contact the slope sides (33a2, 33b2) of the protrusions (33a0, 33b0) of the upper holding portion (33a, 33b).

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.

Abstract: A deflection yoke of a cathode ray tube apparatus comprises a pair of saddle-type horizontal deflection coils located symmetrically with respect to a central axis and substantially in the shape of a truncated pyramid. A magnetic core substantially in the shape of a truncated cone is located coaxially around the horizontal deflection coils, and a pair of vertical deflection coils are wound on the magnetic core. A relation between a space vf between a large-diameter end portion of the magnetic core and each of the horizontal deflection coils and a space vr between a small-diameter end portion of the magnetic core and each of the horizontal deflection coils, with respect to the direction of a vertical axis perpendicular to the central axis, is given by vf≧vr.

Abstract: An electron gun assembly of a cathode ray tube has a main electron lens section comprising at least four electrodes, provided in a sequence of first, second, third and fourth grids, a middle first voltage is applied to the first grid, and an anode voltage is applied to the fourth grid. The adjacent second grid and third grid are connected by a resistor, and second and third voltages of substantially the same potential, corresponding to voltages higher than the middle first voltage and lower than the anode voltage, are applied thereto. An asymmetrical lens is provided between the adjacent second grid and the third grid second lens region, and a voltage which changes in synchronism with the deflecting magnetic field is applied to the first grid.

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: To provide an electron beam irradiation device capable of avoiding a problem of convergence of an electron beam at the maximum scanning points, and constantly obtaining an irradiated region of uniform energy density, an electron beam irradiation device comprising an electron beam source 12, an accelerating tube 13 for accelerating electrons emitted from said electron beam source, a focusing electromagnet 16 for applying a magnetic field to a high energy electron beam, which is formed by the accelerating tube, for controlling the beam diameter of the electron beam, and an electromagnet 17 for deflecting and scanning the beam-diameter-controlled electron beam by applying a magnetic field to the electron beam, wherein an electric current component IF which is synchronized with an electric current IS of the scanning electromagnet 17 is superimposed on an electric current IF of the focusing electromagnet 16, thereby controlling the electric current IF of the focusing electromagnet in a manner that said beam diamet

Abstract: In a cathode ray tube, plural electron beams are directed towards a faceplate biased at screen potential and are magnetically scanned by a non-self-converging deflection yoke across the faceplate to impinge upon phosphors thereon to produce light depicting an image. The plural electron beams are substantially converged near two opposing edges of the faceplate. A processor changes the raster of the image from a first raster corresponding to position of the image to a second raster corresponding to the position of the plural electron beams on the faceplate. One or more electrodes between the tube neck and the faceplate are biased above and/or below screen potential to deflect electrons landing near the periphery of the faceplate.

Abstract: A color cathode ray tube is composed of a glass bulb which has a front panel and a fluorescent screen set on an inner surface of the front panel, an in-line electron gun which is provided in the glass bulb and projects electron beams onto the fluorescent screen, a deflection means including horizontal and vertical deflection coils arranged outside the glass bulb, and a correction device for correcting cross-misconvergence. The correction device is provided with four correction coils that are respectively set for the four quadrants of a rectangular deflection region of the electron beams. The strength of the corrective magnetic fields generated by the correction coils becomes largest when the electron beams are deflected to a horizontal strip in the central part of both the upper and lower halves of the deflection region, and becomes nearly 0 when the electron beams are deflected to areas around the horizontal axis and top and bottom edges of the deflection region.

Abstract: A deflection yoke for Braun tube includes an opening flange coil, a main deflection portion coil extended with a predetermined length from the both end portions of the opening flange coil backwardly; a first neck flange coil connected to the extended end portion of the main deflection portion coil; and a second neck flange coil formed at the front side of the first neck flange coil, wherein, assuming that the height of the first neck flange coil is ‘h’, the length of the second neck flange coil is ‘I’ and their ratio (1/h) is ‘A’, ‘A’ is greater than 0.5 and smaller than 2.0, and assuming that the length of the main deflection portion coil is ‘L’ , the length of the second neck flange coil is ‘I’ and their ratio (I/L) is ‘B’, ‘B’ is greater than 0.04 and smaller than 0.24.

Abstract: A yoke portion with a deflection coil mounted thereon has a rectangular section perpendicular to the tube axis. A horizontal deflection coil of the deflection coil is formed of a loop winding including a pair of parallel portions extending along the both sides of the tube axis and crossover portions connecting the parallel portions. The crossover portion nearer to the neck is formed of a winding wound in the direction along the tube axis.

Abstract: An immersion lens comprising a first magnetic lens unit for generating a first magnetic field and a second magnetic lens unit for generating a second magnetic field is disclosed. The combined magnetic field of the first and second magnetic fields converges the electron beam between the first magnetic lens unit and the second magnetic lens unit. The immersion lens is reduced in size by configuring the second magnetic lens of a permanent magnet.

Abstract: A novel cathode ray tube apparatus is disclosed, in which a yoke portion with a deflection yoke mounted thereon has a basically rectangular non-circular section perpendicular to the tube axis. A separator of the deflection yoke has a section perpendicular to the tube axis expressed as (M+N)/(2*(M2+N2)½)<(SS+LS)/(2DS)≦0.90 where M:N is the aspect ratio, SS the outer diameter along the vertical axis, LS the outer diameter along the horizontal axis, and DS the maximum outer diameter.

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: 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: A core for a deflecting yoke for a CRT includes a first aperture at a neck portion side having a circular configuration, and a second aperture at a funnel portion side, an inner periphery of the second aperture at an edge surface thereof having two major sides and two minor sides. The major sides contain a first circular segment of which a radius is 200 mm or larger and has a radius of which a center exists off a center of the funnel portion and an amount at which the first circular segment occupies the major sides is over 50%. The minor sides contain a second circular segment of which a radius is 100 mm or larger and has a radius of which a center exists off a center of the funnel portion and an amount at which the second circular segment occupies the minor sides is over 40%. The two major sides and the minor sides are tangential to circular segments at four corners thereof.

Abstract: A deflection yoke for a cathode ray tube comprises a funnel shaped separator means 1a, 1b having a cylindrical neck portion 3 where a magnetic ring is attached. The magnetic ring is engaged with upward holding portions 33a, 33b and with downward holding portions 32a, 32b, which hold such magnetic ring. Root portions 33a3 and 33b3 of the downward holding portions 32a and 32b are substantially inflexible, where the inner circumference of the magnetic ring substantially contacts the root portions 33a3 and 33b3, and the root portions 33a3 and 33b3 restrict the position of magnetic ring from being disengaged from the protrusions 33a1 and 33b1 when the downward holding portions 33a and 33b are forced to disengage the magnetic ring.

Abstract: A deflection yoke includes a horizontal coil having a modified wire route in the horizontal coil at one or more predetermined points, which are termed herein turning points, in the middle of the coil which is generating the main magnetic field. A deflection yoke includes a horizontal coil with a neck side and a funnel side, and a window defined by a wire route. The window is disposed in the horizontal coil and has a substantially rectangular shape when viewed in cross section. The wire defines an outline of the window. The wire includes a first portion and a second portion. The wire originates at a first predetermined angle on the neck side of the horizontal coil, and splits into the first and second portions at a first turning point. The first portion is rerouted at a second predetermined angle on the funnel side of the horizontal coil. The second portion turns away from the first portion at an approximately right angle.

Abstract: A convergence magnet assembly for a cathode ray tube (CRT) includes a convergence magnet assembly having at least a one pair of magnet rings having magnetized portions at angular intervals and installed on a neck portion of a CRT for static convergence of three electron beams in an in-line arrangement; and a correction ring with an odd number of poles located at one side of the neck, adjacent an electron beam at one side of the in-line three electron beams, increasing a shift in the electron beam position caused by the pair of magnet rings.

Abstract: A ring-formed correction coil for generating a magnetic field is mounted on the cathode side of CPM 4 provided on the neck portion of a color cathode ray tube, thereby being disposed distant from the deflection yoke. By using the magnetic field generated by supplying a correction current from a control circuit to the correction coil of this arrangement, correction of convergence error of R and G beam horizontal lines are carried out without causing landing transition or raster rotation. Further, since the correction coil is disposed distant from the phosphor screen, a large amount of correction can be assured on the phosphor screen, thereby saving current supplied from the control circuit to the correction coil.

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; a second flange coil extende

Abstract: In a deflection yoke employing a saddle-shaped deflection coil of a bobbin-winding type, a fusion layer for fusing at least those wires of the coil disposed in proximity to each other is provided in each bent portion of the deflection yoke, whereby occurrence of corona at the bent portions can be effectively prevented.

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: Picture display device comprising a picture balance correction system with a picture balance potentiometer. The system has a synthetic material support, with a wall of the housing of the potentiometer forming part of this support. The cap of the housing and the shaft of the potentiometer may be manufactured in one piece. The connections with the other parts of the picture display device are established by a lead-frame which is secured against the support or around which the support is molded.

Abstract: A linearity correction coil device and a video display apparatus using the same are disclosed. In a video display apparatus having a cathode-ray tube, a deflecting yoke for deflecting the electron beam and a linearity correction coil device for compensating a linearity of the electron beam, the linearity correction coil device is horizontally installed on a printed circuit board for the cathode-ray tube, and wherein a vertical length of said linearity correction coil in an intersecting direction to a progressive direction of the electron beam has a shorter length than a horizontal length of said linearity correction coil device in a parallel direction to the progressive direction of the electron beam. Accordingly, it is able to prevent the electron beam from running off a normal orbit by a magnetic field generated from the linearity correction coil device. Therefore, since the electron beam exactly collides with fluorescent material, it is able to prevent a stained image from showing on the cathode-ray tube.

Abstract: A deflection yoke which can simultaneously achieve suppression of induction current arising from an influence of a raster rotation correction coil and correction of misconvergence which varies the current balance of horizontal deflection coils. The deflection yoke of the present invention includes a raster rotation coil, and a pair of coils sharing a single core and respectively connected in series to an upper side horizontal deflection coil and a lower side horizontal deflection coil. The pair of coils are connected such that the polarities thereof may be opposite to each other. The pair of coils suppress current induced by a magnetic field of the raster rotation coil. In order to apply a bias to the pair of coils which share the core, a single bias coil is wound on the shared core on which the pair of coils are wound.

Abstract: A cathode ray tube includes a deflection unit (11) having a cooling fin (25) which is attached to the surface of a tapering surface on a yoke ring (23) by lugs (27). At least one of the lugs has a free end extending axially and outwardly in thermal contact with the tapering surface, and at least another of the lugs has a free end extending axially in an opposite direction and inwardly in thermal contact with the tapering surface.

Abstract: A cathode ray tube including (a) a panel having a fluorescent film on an inner surface thereof for three primary colors emission, (b) an electron gun for emitting electron beams to the fluorescent film, (c) a deflecting yoke located between the panel and the electron gun, and including first and second coils for generating horizontally and vertically deflected magnet fields, (d) at least one first compensator (34) composed of magnetic substance having high magnetic permeability and low hysteresis characteristic for compensating for a profile of magnetic flux density in the horizontally deflected magnetic field, and (e) at least one second compensator (35) composed of magnetic substance having hysteresis characteristic for keeping magnetization when a polarity of the horizontally deflected magnetic field is inverted.

Abstract: A cathode ray tube includes a rectangular panel on which a phosphor screen is formed, a neck in which an electron gun assembly for emitting three electron beams is disposed, and a funnel formed contiguous to both the neck and the panel, and having a deflection yoke mounting portion on which a deflection yoke is mounted. The cross section of the deflection yoke mounting portion fulfills the following condition at the panel side end of the deflection yoke mounting portion. 1.0≦rh/rv≦1.3 where rh is a diameter of the funnel directed to a direction of a long axis of the panel, and rv is a diameter of the funnel directed to a direction of a short axis of the panel.

Abstract: A deflection yoke comprising a coil separator having a rear plate and a neck part which are defined therein and a printed circuit board which is positioned on a side thereof; at least one horizontal deflecting coil disposed on a circumferential inner surface of the coil separator to produce a horizontal magnetic field and connected to the printed circuit board; at least one vertical deflecting coil disposed on a circumferential outer surface of the coil separator to produce a vertical magnetic field; a ferrite core placed on the circumferential outer surface of the coil separator to reinforce the horizontal and vertical magnetic fields of the horizontal and vertical deflecting coils; insulating means defined on an inside surface of the coil separator to prevent a short from being generated due to a contact between one end and the other end of the horizontal deflecting coil connected to the printed circuit board; and coil distance maintaining means defined on an outer surface of a side of the coil separator to

Abstract: Four magnetic pieces are provided inside the cup-shaped portion of a shield cup. Correction magnetic field generating faces at the tips of the magnetic pieces are opposed to each other and sandwich an electron beam. Correction can be conducted according to the astigmatism amount of three electron beams because a correction magnetic field corresponding to the strength of a deflection magnetic field can be generated easily by leading the deflection magnetic field absorbed by the principal face portion of each magnetic piece to the correction magnetic field generating face. Thus, the difference in astigmatism amount among the electron beams caused by the deflection magnetic field can be corrected. Therefore, a color cathode ray tube apparatus that can display images with a high resolution over the whole screen surface can be provided.

Abstract: The present invention provides deflection yoke devices used for a cathode ray tube. One of the deflection yoke devices of the present invention comprises a compensation coil having a bobbin formed with a hollow in which an internal thread is cut, a screw core forcibly fitting in the hollow of the bobbin and a damping material interposed between the bobbin and the screw core to prevent the displacement of the screw core when an external vibration or a shock is applied to the deflection yoke device.

Abstract: A deflection yoke includes horizontal deflection coils; vertical deflection coils; and coils for correcting a vertical pincushion distortion, which coils are provided aside from the vertical deflection coils; wherein the coils for correcting a vertical pincushion distortion have such a wire-wound form as to generate a magnetic field having a pattern substantially equal to that of the vertical deflection coils. This is effective to carry a parabolic current with horizontal cycles for correcting a vertical pincushion distortion at a low voltage, and hence to simplify the circuit configuration and reduce the manufacturing cost.

Abstract: A deflection yoke for a CRT including a horizontal deflection coil having an axial length in an axial direction of the CRT in an installed position that is not less than 60 mm and not more than 80 mm, a vertical deflection coil having an axial length in an axial direction that ranges from 45 mm to 65 mm, and a core having an axial length in the axial direction that ranges from 25 mm to 45 mm. The subject deflection yoke prevents deterioration in horizontal and vertical deflection sensitivity in CRTs having a neck diameter that is greater than 22 mm and less than 26 mm with a deflection angle that ranges from 95 to 110 degrees. In an alternate embodiment a deflection yoke for a CRT including a horizontal deflection coil, a vertical deflection coil disposed outside of the horizontal deflection coil, and a core disposed outside of the vertical deflection coil wherein in an installed position of the yoke, an inner surface of the deflection yoke is circumscribed around a circle having a diameter of 56.

Abstract: The color cathode-ray tube comprises a glass bulb, a shadow mask, a deflection yoke, and an electron-beam shifting device. The glass bulb comprises a face-plate with stripe-like phosphors for a plurality of colors formed on its inner face by a printing method, a funnel portion connected to the rear part of the face-plate, and a neck portion formed at the rear of the funnel portion. Inside the neck portion, an inline electron gun is provided for emitting electron beams. The shadow mask comprises a plurality of openings disposed corresponding to the stripe direction of the phosphors for each color on the face-plate. The deflection yoke is provided on the peripheral surfaces of the funnel portion and the neck portion. The electron-beam shifting device is provided on the peripheral surface of the neck portion for shifting the deflection center of the electron beams in the inline-alignment direction of the electron beams. The phosphors are formed by the printing method, thus reducing the costs.

Abstract: This invention relates to an apparatus for compensating convergence in a color cathode ray tube, more particularly to an apparatus for minimizing the convergence drift variance of R and B electron beams on a screen so as to improve convergence characteristics and a picture quality on the screen. The apparatus for compensating convergence drift comprising: a convergence purity magnet for converging the electron beams emitted from the electron gun on the specific point of the screen of the color cathode ray tube; and a supplementary magnet ring 52 with at least four-magnetic pole contacting the neck N between a second grid electrode 24 and the deflection yoke 60. Particularly, the supplementary magnet ring is mounted on a holder 48 of the convergence purity magnet 40 and has a pole arrangement to move the convergence of the R and B beams in the direction opposite to the electron gun from the screen.

Abstract: A method and apparatus for securing a deflection yoke onto a cathode ray tube includes forming pockets having deformable, resilient inner walls along a circumferential surface of the deflection yoke. When the deflection yoke is mounted on the cathode ray tube, the inner walls deform slightly to conform to a contact portion of the cathode ray tube. The position of the deflection yoke with respect to the cathode ray tube it then adjusted into proper alignment. Once the deflection yoke and cathode ray tube are properly aligned, fast curing epoxy is poured into each of the plastic pockets, wedging the deflection yoke permanently into its desired orientation on the cathode ray tube. The pockets can either be integrally formed with the deflection yoke or they can be manufactured and attached to the deflection yoke in a separate operation.

Abstract: A deflection yoke for a cathode-ray tube of a video display, includes a pair of horizontal deflection windings and a pair of vertical deflection windings. The pair of vertical deflection windings includes a saddle-shaped winding. The saddle-shaped winding includes a front end winding portion, close to a screen of the cathode ray tube, a rear end winding portion, remote from the screen and a pair of side winding portions, between the front and rear end portions. The saddle-shaped winding is disposed generally symmetrically with respect to a plane of symmetry. A depression or notch is formed in the front end winding portion for varying a winding distribution locally. The depression or notch forms asymmetry with respect to the plane of symmetry.