Abstract: A horizontal deflection coil is formed by winding conductive wires. A wire density of the conductive wires in a first portion of the horizontal deflection coil, which is defined in a predetermined angle range centering on a winding angle, and which is set to be &thgr;1 with respect to a horizontal direction as 0° in an electron-gun-side region, &thgr;2 with respect to a horizontal direction as 0° in a middle region, and &thgr;3 with respect to a horizontal direction as 0° in a screen-side region on a cross section perpendicular to a tube axis, is smaller than a wire density of the conductive wires in a portion of the horizontal deflection coil other than the first portion. The winding angles &thgr;1, &thgr;2, and &thgr;3 in the first portion satisfy &thgr;1≧&thgr;2≧&thgr;3.

Abstract: The invention relates to a cathode ray tube comprising means (5) for generating an electron beam (6,7,8), means (51) for deflecting the electron beam, and a coil (14′) for influencing a deflection of the electron beam (6,7,8). The coil (14′) comprises an electrically conductive coil holder (46) and coil windings (47,48) having an electrically conductive outer layer (44). The electrically conductive layer (44) of the coil wires (41) and the coil holder (46) cooperate with each other so as to form a conductive path A between successive coil windings (47,48). Due to the outer layer (44) of the wires and the conductive coil holder (46) an electrical path A between successive windings (47,48) is created that provides damping and by which ringing is suppressed.

Abstract: A cathode ray tube with a central axis includes a panel with an inner phosphor screen, and a funnel connected to the panel. The funnel has a cone portion with a neck sealing side, and a body portion extended from he cone portion to the panel. A deflection yoke is externally mounted around the funnel. A neck is connected to the neck sealing side of the cone portion. An electron gun is mounted within the neck. The funnel is structured to satisfy the following condition: 0.52+0.001×(&agr;/2+&phgr;)<b/a<0.74+0.001×(&agr;/2+&phgr;) where a indicates the distance (mm) between the reference line R/L and the too of round TOR on the tube axis line, b indicates the disance (mm) between the reference line and the neck sealing side of the cone portion on the tube axis Z line, &agr; indicates the deflection angle (degree), and &phgr; indicates the diameter (mm) of the neck.

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 device for correcting residual mis-convergence errors in a color cathode ray tube, the tube including a narrow-necked section, located at the rear thereof, in which electron guns mounted therein generate forwardly-directed red, blue and green electronic beams, an outwardly-opening center skirt section, extending forward from the narrow-necked section, and terminating in a wide perimeter surrounding a relatively flat, pixel-coated, viewing screen section that is arranged generally orthogonal to the axis of the narrow-necked section and upon which the electronic beams are directed to strike the pixels to produce color and images for viewing from the front of the tube, and further having at least one pair of electromagnetic coils mounted outside the tube, for initial focusing of the electron beams during their travel from the guns to the screen, the device including a separator made of a plastic, including a high density of magnetizable particles therein, the separator arranged for placement about the outside

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 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 (I/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 projection type cathode ray tube device includes a panel, a neck, a funnel connecting the panel to one end of the neck, and a stem closing the other end of the neck. An electron gun is housed in the neck for projecting an electron beam toward a phosphor screen on the panel. The neck includes a small-diameter neck portion disposed on its funnel side, a large-diameter neck portion disposed on its stem side, and a neck junction region connecting the small-diameter neck portion and the large-diameter neck portion. A deflection yoke is disposed in a vicinity of a transition region between the funnel and the small-diameter neck portion. A convergence yoke for generating a beam-convergence magnetic field is disposed to extend from the large-diameter neck portion and surround at least a portion of the neck junction region.

Abstract: In a flat cathode-ray tube, there are problems that an axis of electron beam is separated before the electron beam enters a main lens due to magnetic field of a magnet disposed outside a neck, and coma aberration is generated to degrade an image quality. It is an object of the present invention to solve these problems. A flat cathode-ray tube comprises an electron gun 281 having a main lens 35M whose center coincides with a tube axis, a deflection yoke, and a magnet disposed outside a neck. An axis of a prefocus lens of the electron gun is separated from the tube axis.

Abstract: A deflection yoke for a color cathode ray tube is disclosed which is easily assembled. The deflection yoke has a separator, a ferrite core and a position holding unit provided to the separator and the ferrite core, for holding the ferrite core in a predetermined position with respect to the separator. The position holding unit comprises at least one pair of alignment parts consisting of a raised portion and a depressed portion, the raised portion and the depressed portion being provided on the ferrite core and the separator, respectively, and being fitted to each other.

Abstract: A method and projection television system for projecting images having a plurality of color components, includes a device for filtering a first color component signal from a composite signal to provide a filtered first color component signal. A defocusing mechanism defocuses the first color component signal based on the filtered first color component signal. A gain adjustment device adjusts a gain of at least one other of a plurality of color component signals of the composite signal. An amount of defocusing performed by the defocusing mechanism and a gain adjustment by the gain adjustment device are dependent on a content of the composite signal. In another aspect of the invention, a spot wobble scheme may be employed alone in a static defocussing system, without dependence upon the video signal content.

Abstract: A cathode ray tube (CRT) having a particular funnel configuration allows electron beams to be deflected to the phosphor surface of the panel without obstruction. The configuration of the yoke attachment portion of the funnel is based upon a curvature of an inner surface of the funnel and based upon a thickness of the funnel. The inner surface of the yoke attachment portion is at a recession from the curvature of the inner surface of the funnel. In one embodiment, if the depth of the recession is S and the thickness of the funnel is T, the recession depth of the inner surface of the yoke attachment portion is 0.1×Tmm≦S≦0.5×Tmm.

Abstract: A display device is disclosed. A cathode ray tube has a screen on which a fluorescent layer is applied and an electron gun section in which electron guns are mounted. A deflection yoke includes a coil separator, and horizontal and vertical deflecting coils which are disposed on circumferential inner and outer surfaces of the coil separator, respectively. The coil separator has a neck part which is fitted around the electron gun section of the cathode ray tube. A first locking section is arranged on a circumferential outer surface of the neck part of the coil separator. A clamping mechanism is fitted around the neck part of the coil separator. The clamping mechanism has a second locking section. The second locking section has a closed-loop shaped configuration which surrounds the circumferential outer surface of the neck part. The second locking section cooperates with the first locking section for locking the deflection yoke to the electron gun section of the cathode ray tube.

Abstract: To construct a CRT display device capable of effectively suppressing unwanted radiation of electromagnetic waves occurring as a result of horizontal deflection or vertical deflection. A correction lead (6) series-connected to horizontal deflection coils (1) is disposed at outer peripheral positions of the horizontal deflection coils (1) and between the horizontal deflection coils (1) and a faceplate of a CRT (4). With this arrangement, electromagnetic fields produced by the horizontal deflection coils are canceled out by electromagnetic fields produced by the correction lead (6), thereby suppressing unwanted radiation of electromagnetic waves at the deflection frequency and its harmonic components.

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: The disclosed cathode-ray tube has a panel provided with a fluorescent screen on an inner surface thereof, a funnel joined to the panel, a neck joined to the funnel and provided with electron guns facing the fluorescent screen, and a pyramidal yolk mounting part provided in a region extending from the neck side to the panel side, the pyramidal yolk mounting part having an inside profile in a rectangular form projecting to the outside of the funnel with fixed radii of curvature, the rectangular cross section of the yolk mounting part being designed to have the ratio of a radius of outer curvature to a radius of inner curvature in the range of 0.70≦Rov/Riv≦0.90 and 0.70≦Roh/Rih≦0.93, wherein Rov and Riv are radii of outer and inner curvatures on the minor axis perpendicular to the tubular axis, respectively; and Roh and Rih are radii of outer and inner curvatures on the major axis perpendicular to the tubular axis, respectively.

Abstract: A cathode ray tube with a central axis includes a panel with an inner phosphor screen, and a funnel connected to the panel. The funnel has a cone portion with a neck sealing side, and a body portion extended from the cone portion to the panel. A deflection yoke is externally mounted around the funnel. A neck is connected to the neck sealing side of the cone portion. An electron gun is mounted within the neck. The funnel is structured to satisfy the following condition: −0.145<H/L−(0.0225×&agr;)<0.08 where H indicates the distance between opposite points at the top of round on a line drawn to be normal to the tube axis line, L indicates the distance between the top of round and the neck sealing side of the cone portion on the tube axis line, and &agr; indicates the deflection angle (degree).

Abstract: A deflection yoke capable of easily adjusting a member having a pair of magnetic pieces by moving the member to a standard state in the case of correcting misconvergence. According to the deflection yoke of the invention, a member having a pair of magnetic pieces disposed in the horizontal deflection direction is attached to an electron gun side of the deflection yoke. The shape of a part of each of ends of the member coincides with a part of the outer shape of the electron gun side of the deflection yoke. The adjusting person can easily set the member into the standard state by adjusting the parts with his/her fingers. By moving the member in the horizontal direction from such a state, misconvergence can be corrected.

Abstract: A deflection yoke apparatus include a saddle-type coil bobbin, first guide grooves, second guide groove, third guide groove, and a multi-wire conductor. The saddle-type coil bobbin has a front end portion and a rear end portion. The first guide grooves is formed in the inner surface of the coil bobbin and extends across the front end portion and the rear end portion. The second guide groove is formed in the front end portion of the coil bobbin. The third guide groove is formed in the rear end portion of the coil bobbin. The multi-wire conductor is wound around the coil bobbin, the conductor being routed through the first guide groove, the second guide groove, and the third guide groove. The second guide groove and third guide groove have a width in a range of 1.0 to 1.5 times the diameter of the conductor.

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: A funnel for a cathode ray tube has a relationship 0<&agr;(z)<d in an arbitrary cross section P(z) parallel with a plane including an open end portion, where &agr;(z) is an angle (° ) defined between a line and a major axis (LA) of the funnel, the line being connecting an outermost part D(z) on at least one of an outer surface and an inner surface of the body portion and a center axis (C) of the funnel, and d is an angle (° ) defined between a diagonal axis (DA) of the funnel and the major axis (LA).

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: The present invention relates to a display device comprising a cathode ray index tube (1) having a neck portion (1″) and a screen portion (1). The display device comprises an electron gun assembly (3) for generating a plurality of electron beams (3R,3G,3B), positioned in the neck portion (1″) of the cathode ray index tube (1), a deflection unit (5), placed around the neck portion (1″) of the cathode ray index tube (1), for deflecting said plurality of electron beams (3R,3G,3B), and a convergence unit (6) for converging said plurality of electron beams (3R,3G,3B). The deflection unit (5) is placed at an axial distance from said electron gun assembly (3), closer to said screen portion (1′). The convergence unit (6) is placed in close proximity to the deflection unit (5).

Abstract: A landing correction coil is provided at the rear of a horizontal deflection coil of a deflection yoke or at a position where it is closely coupled with the horizontal deflection coil. The landing correction coil is fixed so as to generate a magnetic field perpendicular to the axis of a CRT. Moreover, the landing correction coil is connected so that a current flowing in a horizontal deflection coil may flow in the landing correction coil. Furthermore, the landing correction coil is connected to an adjustment coil for adjusting the current flowing therein. A varying means is provided in the adjustment coil and the polarity and amplitude of the current flowing in the landing correction coil is adjusted by the varying means. This causes the magnetic field distribution for scanning an electron beam of a CRT to be changed and enables a landing characteristic to be adjusted electrically.

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: Auxiliary deflection coils are connected to horizontal deflection coils. Each auxiliary deflection coil is disposed in the intermediate region between the inner peripheral end adjacent to a window and the outer peripheral end. Each horizontal deflection coil is dividable into three regions extending from its winding introductory part to its winding terminal part. A variable inductance coil is connected in parallel with the intermediate region to control the horizontal deflection current flowing across the horizontal deflection coil. The variable inductance coil has a cylindrical core installed in a hollow space of a bobbin and a coil connected in parallel with the auxiliary coil. A disc core is provided adjacent to the coil. The disc core has an end face larger in area than an end face of the cylindrical core.

Abstract: Openings which are formed by dividing pins, are formed on a side section of a horizontal deflection coil within a range of 20 to 35% of a length of the horizontal deflection coil from a larger diameter flange and within an angle of 10 to 25 degrees to an X-axis. Other openings, which are formed by dividing pins are formed on the side section of the horizontal deflection coil within a range of 55 to 70% of a length of the horizontal deflection coil from the larger diameter flange and within an angle of 25 to 40 degrees to the X-axis.

Abstract: In a cathode ray tube, an electron beam is directed towards a faceplate having an electrode biased at screen potential and is magnetically scanned across the faceplate to impinge upon phosphors thereon to produce light depicting an image. A six-pole coil is disposed proximate the deflection yoke and/or on the tube neck to modify the focus of the red, green and blue electron beams to control focus. An electrode between the tube neck and the faceplate is biased at or above screen potential to deflect electrons over a greater total angle than is obtained from the magnetic deflection.

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: Deflection yoke for a cathode ray tube including horizontal and vertical deflection coils for deflection of electron beams emitted from an electron gun in horizontal and vertical directions, respectively, a ferrite core disposed to surround the vertical deflection coil for improving a magnetic efficiency, an holder adapted to fix positions of the horizontal and vertical deflection coils and the ferrite core and insulate the horizontal and vertical deflection coils, and a magnet provided on an upper side and a lower side of a flange part formed at a screen side of the holder for canceling a magnetic field leaked from the horizontal deflection coil at the screen side of the holder.

Abstract: In a color cathode ray tube, the outer diameter of a neck is set at 22 mm-23 mm, the diameter of a pin circle formed by stem pins outside the flare section of a stem welded to an end of the neck is set at a nominal value of 15.24 mm, and the maximum diameter of a base adhered to an outer surface of the stem is set at 23 mm or less. Accordingly, while the neck outer diameter is reduced to reduce the power consumption of the color cathode ray tube, the color cathode ray tube has a high resolution.

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: The present invention relates to a yoke ring for use in a deflection unit in a cathode ray tube (CRT), said yoke ring having a neck and a flared side, and being defined by an inner and an outer contour. According to the invention, the inner contour is periodically deformed in the radial direction, the contour having at least two local minima and maxima. This deformation influences the magnetic field generated by the coils in the CRT, leading to improved FOS performance. In particular, astigmatism, coma and raster errors are reduced.

Abstract: A color cathode ray tube comprises an electron gun and a deflection unit, the electron gun being arranged in a neck portion of an envelope, and the deflection unit being arranged around the envelope. The neck portion of the envelope includes a first part in which the electron gun is arranged. Behind this first part, the neck portion narrows (the outside diameter decreases). The deflection unit is at least partly provided around this narrowed part.

Abstract: A CRT for the display of a large screen television set which includes a tube envelope having a pair of tube necks and a phosphor display screen, a pair of electron guns arranged in a same horizontal plane and each positioned in a different one of the tube necks, for directing dual electron beams to impinge upon the phosphor display screen, and magnetic deflection yokes for horizontally deflecting the dual electron beams to produce a visual display of partially overlapping dual raster scans on the display screen.

Abstract: A deflection unit of a cathode ray tube is provided with a cooling fan. The fan includes means for reducing the disturbing effect of the electric field generated by the fan on the deflection of the electrons, or the fan is arranged in such a manner that the disturbing effect is small.

Abstract: A cathode ray tube has a deflection unit designed to efficiently reduce the required power consumption. The deflection unit comprises a horizontal deflection coil with a non-circular cross-section, a separator placed outside the horizontal deflection coil, with its inner configuration corresponding to the outer configuration of the horizontal deflection coil, a vertical deflection coil placed outside of the separator with its non-circular cross-section corresponding to the outer surface of the separator, and a ferrite core for closely attaching the vertical deflection coil to the separator, with its inner side formed to be similar to the inner configuration of the vertical deflection coil.

Abstract: The invention describes a cathode ray tube in which the position of the electron beam (7, 8, 9) is determined in that detection strips (12, 13) are arranged between or below the individual phosphor strips of the phosphor layer (11). The detection strips (12, 13) each comprise a semiconductor component which amplifies the measured current signal. This renders the position determination of the electron beam (7, 8, 9) more definite and reproducible.

Abstract: An electron gun assembly of a color cathode ray tube emits at least one electron beam having an oblong cross-sectional shape extending substantially in the horizontal direction, and emits three electron beams in a substantially non-convergent state toward the central portion of a phosphor screen. A deflection device comprises an auxiliary magnetic field generator for generating a quadrupole magnetic field component which focuses the electron beam with an oblong cross section more heavily in the horizontal direction than in the vertical direction. The auxiliary magnetic field generator is located in a given region in a tube-axis direction in which the horizontally deflecting coil is located.

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′). The coils (22′) comprise 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;). Here &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 the winding density at &phgr; equal to 0°, and the sign of N &phgr; denotes the winding direction.

Abstract: Disclosed is a deflection yoke.

Abstract: A section perpendicular to a tube axis, of a yoke portion having a deflection yoke mounted thereon is in the shape of a non-circle based on a rectangle. A section perpendicular to the tube axis, of a core portion of the deflection yoke has a shape holding the relation (M+N)/(2*(M2+N2)½<(SB+LB)/(2DB)≦0.90 where M:N is an aspect ratio, SB is the inner diameter along the vertical axis, LB the inner diameter along the horizontal axis, and DB a maximum inner diameter.

Abstract: A deflection yoke for preventing fluctuation of the deflection yoke by maintaining a firmly engaged state while preventing fracture and damage thereof caused by an assembling shock generated when assembling a printed circuit board and a rear cover. The printed circuit board has upper hook flaps protruded from a side surface of the rear cover including a plurality of slide grooves and lower hook flaps provided on the side of the upper hooks for penetrating holes is provided, the hook flaps are composed of supporting ribs and protrusions. Especially, the protrusions of the upper hook flap have an inclined angle to assemble the printed circuit board that is combined the rear cover stably.

Abstract: A picture display device comprising a cathode ray tube (1) with an elongated display screen (8) and a deflection system (9) is described. The deflection power is reduced by two means. The deflection system (9) is arranged to scan the lines in the direction of the short axis (22) of the display screen (8), and the cone portion (3) of the cathode ray tube (1) has an elongated cross-section (54) whose aspect ratio is larger than or equal to the aspect ratio of the display screen (8), thereby enabling the deflection system (9), and in particular the line deflection subsystem (12), to be positioned closer to the electron beam envelope (51), which reduces magnetic losses.

Abstract: An electron gun which emits three electron beams consisting of a center beam and paired side beams arranged in line in the horizontal axis is arranged in the neck of the vacuum envelope. A neck-side orbital correction coil unit for over-converging the side beams running toward the peripheral portion of a phosphor screen and a panel-side orbital correction coil unit for under-converging the side beams running toward the peripheral portion of the phosphor screen are provided between the cathode of the electron gun and the phosphor screen. The panel-side orbital correction coil unit has four orbital correction coils provided inside the magnetic core of a deflection yoke. Each orbital correction coil includes paired coil wires extending in the tube axis direction. One of the coil wires is positioned at an angle of 10 to 30° to the vertical axis, and the current flows from the neck side toward the panel through this coil wire.

Abstract: A cathode ray tube 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 is sequentially provided with a body having a large-sized end and a small-sized end, and a cone portion having 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 body meets the large-sized end of the cone portion at a point. A neck is sealed to the small-sized end of the cone portion. The funnel is structured to satisfy the following condition: 1.16≦(D/2)/tan((&psgr;/2))/(FG−TN)≦1.35 where D indicates the size of an effective area of the phosphor screen, FG indicates the distance between the large-sized end of the body and a final accelerating electrode of an electron gun fitted in the neck, TN indicates the distance between the small-sized end of the cone portion and the inflection point of the funnel, and &psgr; indicates an electron beam deflection angle.

Abstract: A deflection yoke for an in-line self convergence type color cathode-ray tube. The deflection yoke includes an auxiliary coil assembly having auxiliary coils which are electrically coupled with vertical deflection coils and which produce electric field for compensating for misconvergence caused by comatic aberration. The auxiliary coil assembly also comprises a pair of U-shaped cores which are opposed to each other via a neck portion of the color cathode-ray tube and on which the auxiliary coils are wound. The deflection yoke comprises one or more magnetic material pieces, for example, a pair of magnetic material pieces which are disposed on respective one of said U-shaped cores. The one or more magnetic material pieces are preferably made of high permeability metal.

Abstract: In an increased-diameter funnel section and a almost pyramidal decreased-diameter yoke section constituting the funnel section of the envelope of a cathode-ray tube, the outside surface of the yoke section between a neck connecting portion on which a neck and the yoke section are coupled and a position close to a boundary of a increased funnel section, on which deflection yoke is provided, is shaped so as to fulfill the following expression: 0.00≦(&agr;0−&agr;min)≦0.04 where the index value indicating the degree of rectangle at the deflection reference position is &agr;0 and the minimum of the index values in the whole area of the yoke section is &agr;min. This makes it possible to provide a cathode-ray tube apparatus which secures a sufficient strength of the vacuum envelope to atmospheric pressure even when the yoke section is made pyramidal and which reduces the deflection power effectively and thereby fulfills the demands for higher luminance and higher-frequency deflection.

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 color cathode-ray tube having at least one trajectory correction device including a plurality of trajectory correction coils, and a current supply circuit for supplying current to these coils. The trajectory correction device functions to over-converge or under-converge a pair of side beams at a peripheral portion of the phosphor screen relative to a center of the phosphor screen. The trajectory correction device produces a magnetic field such that there is a position in the produced magnetic field where no force is exerted on the three electron beams. This position is separated from a plane including a tube axis, and a first direction or a second direction. In this color cathode-ray tube apparatus with this structure, no degradation occurs in focusing or distortion characteristics even where the trajectory correction device is provided, for example, in realizing a flat screen by using a press-formed shadow mask.