Abstract: Disclosed is a method for correcting inner pin distortion generated in the CRT product and deflection yoke thereof. According to the disclosed method and deflection yoke thereof, the additional circuit for suppressing inner pin distortion phenomenon on the screen is not required as the related art, reduction in manufacturing costs is possibly achieved. Also, as the circuit for suppressing pincushion is not used, power dissipation could be reduced, and instability in dispersion and characteristics of a pin in the middle portion due to increase of dispersion generation by a wiring of a coil could be resolved.

Abstract: A cathode ray tube is provided, and more particularly, a cost-effective cathode ray tube effective for minimizing deterioration of color purity and obtaining a sufficient margin for a beam strike neck (BSN) phenomenon by moving a ½ center (deflection center) closer to a panel without changing the curvature of a funnel or the thickness of a glass inside the funnel.

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: A deflection yoke on a yoke mounting portion with a truncated pyramid shape has a pair of saddle-type horizontal deflecting coils that is located symmetrically with a central axis and has a truncated pyramid shape. A core with a truncated cone shape is coaxially located on the outer periphery of the horizontal deflecting coils. A pair of vertical deflecting coils are toroidally wound around the core. If the positions of a horizontal axis and a vertical axis are given by 0° and 90°, respectively, in the circumference direction around the central axis, the winding of one vertical deflecting coil has a starting point on the horizontal-axis side within the range of 5°-30° and is distributed from the starting point to 90° and wound symmetrically with the vertical axis. The windings of the vertical deflecting coils are wound symmetrically with the horizontal axis.

Abstract: In a color cathode ray tube, by optimizing an outer radios of curvature, an inner radius of curvature on a corner portion, a thickness of a long side, a thickness of a short side, a thickness of the corner portion, the total length of the panel, the total length of the funnel body and the total length of a yoke portion of the funnel determining a section shape of the yoke portion of the funnel, a stress concentrated on the yoke portion can be lowered. In addition, according to the increase of an inner radius of curvature of the corner portion of the yoke portion, a crash phenomenon of an electron beam is decreased, and an impact resistance and productivity improvement in fabrication process can be secured by lowering a high stress occurrence on the funnel in vacuum.

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 picture tube device that can suppress the deformation of the electron beam spot shape and improve the horizontal resolution using a simple construction is provided. A horizontal deflection coil generates a horizontal deflection magnetic field that is substantially uniform. A plurality of electron beams are substantially parallel with the tube axis when passing one end of a core of a deflection yoke facing an electron gun. A lens forming unit forms a lens through which the plurality of electron beams pass, between the electron gun end of the core and a phosphor screen. The lens has an effect of causing the plurality of electron beams to approach each other in a horizontal direction, irrespective of which part of the phosphor screen the plurality of electron beams reach.

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: The invention provides a deflection yoke comprising: a funnel-shaped core (ii) being made of a magnetic material, (iii) having, on its inner wall, ridges each of which starts from the narrower end and extends toward the wider end for a part of the length of the core, the ridges being arranged circumferentially at intervals and thereby forming core slots, and (iv) in which the remaining inner wall near the wider end is smooth; a first deflection coil wound as partially guided by the core slots; second deflection coil positioned more inward than the first deflection coil; and an insulating frame that (i) is sandwiched between the first and second deflection coils, and (ii) has, in an area corresponding to the core's smooth area, guiding slots extending along the CRT axis direction and being arranged circumferentially, wherein the second deflection coil is wound as partially guided by the guiding slots.

Abstract: A cathode ray tube comprises a panel having a fluorescent screen on an inner surface; a funnel connected to the panel, an electron gun housed in the funnel; emitting electron beams; and a shadow mask for selecting colors of the electron beams emitted from the electron gun, wherein the deflection yoke comprises a deflection coil for deflecting the electron beams in horizontal and vertical directions, a holder for insulating the deflection coil, and a ferrite core for reducing a magnetic field generated by the deflection coil, and an opening is formed on a flange portion of an opening section on a screen side of the deflection coil.

Abstract: A convergence yoke embodying the present invention produces two-pole magnetic field for deflecting the electron beam in a horizontal direction or a vertical direction, and comprises a ring core 1 having a horizontal coil 2 and a vertical coil 3 wound therearound. With the horizontal coil 2 and the vertical coil 3, winding density distribution wherein winding angle &thgr; from each of a horizontal coil reference axis 20 and a vertical coil reference axis 30 is a variable is in proportion to cos2 &thgr;, whereby magnetic field strength distribution becomes more uniform than conventionally.

Abstract: The invention relates to a deflection unit for cathode ray tubes in which the energy for deflection is reduced. This is done by providing a magnetic material between frame coils and line coils of the deflection unit. In an advantageous embodiment of the invention, first void spaces as well as second void spaces between the frame coils and a yoke ring and/or third void spaces between wire strands of the frame coils are filled. A deflection energy reduction of up to 30% can be obtained.

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: 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 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: 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 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 display apparatus comprising an evacuated envelope having an interior surface and an exterior surface is disclosed. The envelope includes a faceplate having a luminescent screen on the interior surface thereof. An electron gun is disposed within a neck of the envelope for generating at least one electron beam that is directed toward the luminescent screen. A funnel connects the neck of the envelope with the faceplate. A deflection yoke is disposed around the envelope at the junction of the neck and the funnel. The yoke is attached to the envelope with an adhesive. A resistive primer coating is disposed on the envelope and forms a barrier between the yoke adhesive and the envelope. The resistive primer coating is formed from an aqueous formulation comprising a copolymer of chloroprene and methacrylic acid, a conductive filler material and at least one cross-linking agent.

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: The present invention relates generally to a deflection yoke for a color television, and more particularly to a deflection yoke, in which an auxiliary coil provided to a deflection coil that is a part of a deflection yoke is stably supported, thereby reducing the non-uniformity of assembly and controlling picture characteristics, thus greatly improving the quality of a cathode ray tube. The deflection coil includes a main coil comprising a screen portion, a neck portion and a body portion for connecting the screen portion to the neck portion, an auxiliary coil positioned at a center of the main coil, and connected to the neck portion at its lower ends to form a closed shape, and bridges for connecting an upper end of the auxiliary coil to the main coil to prevent movement of the auxiliary coil.

Abstract: The present invention discloses a deflection yoke for compensating mis-convergence which can compensate an error generated due to upper and lower side control unbalance during the YH compensation circuit operation by equalizing length of wires connected between upper and lower side coma free coils and connection terminals. In addition, the deflection yoke can compensate mis-convergence by compensating the error generated due to the upper and lower side control unbalance during the YH compensation circuit operation by serially connecting a resistor having a resistance value corresponding to wiring length difference of the upper and lower side coma free coils to a shorter wire.

Abstract: Disclosed is a deflection yoke which is so configured that a coil separator and horizontal deflection coils have angular cross sectional shapes and a ferrite core and vertical deflection coils have circular cross sectional shapes to improve deflection sensitivity thereby reducing power consumption.

Abstract: Each horizontal deflection coil 2 comprises the smaller diameter flange 2A. A width “b” of the smaller diameter flange 2A in the horizontal direction of a screen of a color picture tube is more than twice a height “a” of the smaller diameter flange 2A in the vertical direction of the screen.

Abstract: A cathode ray tube mounted with: a front glass panel; a funnel connected to the panel, thereby forming a vacuum tube; an electron gun emitting electron beams; and a deflection yoke deflecting the electron beams emitted from the electron gun in the horizontal and vertical direction; wherein the deflection yoke comprises: a deflection coil wound of a coil wire deflecting the electron beams; wherein the coil wire has a core reinforcing a magnetic field generated around the deflection coil, and the deflection coil wire comprises an aluminum core; a copper layer surrounding the aluminum core; and an insulating layer surrounding the copper layer

Abstract: A funnel structure of a CRT in which provided that a deflection angle is 110° or more, a length of an outer surface evaluation line formed by connecting a TOR outer surface end where the funnel yoke portion and the funnel body portion meet and a neck seal outer surface end where the funnel yoke portion and the neck portion meet by a straight line is ‘a’ and a length of a straight line from the outer surface evaluation line where a vertical distance between the funnel yoke portion outer surface and the outer surface evaluation line is maximized, to the neck seal outer surface end is ‘b’, a formula of 0.20≦b/a≦0.40 is satisfied, so that a sensitivity of a deflection yoke is improved and a beam shadow neck margin of the electron beam can be satisfied.

Abstract: A cathode ray tube apparatus comprises the deflection yoke including a horizontal deflecting coil for deflecting the electron beams in a horizontal direction. The horizontal deflecting coil has a main coil portion located along the direction of a tube axis, a flange portion located on the phosphor-screen side of the main coil portion, and a bendless flange portion located on the neck side of the main coil portion. The maximum coil thickness of the neck-side flange portion is greater than the maximum coil thickness of the main coil portion near the neck-side flange portion.

Abstract: A cathode ray tube having a ferrite core with a modified sectional configuration facilitates the correction of a mis-convergence along a diagonal direction of a screen, improves the efficiency with which electrons within electron beams are deflected, and is manufacturable via a simplified process.

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.

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 yoke is used for a cathode ray tube (CRT) including a glass tube having a screen surface and a straight portion for accommodating an electron gun. The deflection yoke includes a main deflection yoke including first and second horizontal deflecting coils and first and second vertical deflecting coils, and a sub-deflection yoke provided at a side of the main deflection yoke towards the electron gun of the CRT. The first and second horizontal deflecting coils have substantially saddle shapes and includes first and second coil-connection-wire sections and first and second horizontal deflection sections, respectively. The first and second coil-connection-wire sections are wound in a direction perpendicular to a tube axis of the CRT and along the straight portion, respectively. The first and second horizontal deflection sections are located towards the screen surface from the first and the second coil-connection-wire sections, respectively.

Abstract: Deflector for cathode-ray tube comprising a pair of horizontal deflection coils and a pair of vertical deflection coils, the two pairs being in the shape of a saddle and isolated one from the other by a separator, a frustoconical shaped ferrite ring at least partially covering the deflection coils, the deflector being characterized in that it includes to the rear of the deflection coils, between the horizontal and vertical deflection coils, four field shapers placed symmetrically with respect to the axes of symmetry of the deflector. These shapers are placed so as to increase the amplitude of the second harmonic of the potential of the vertical deflection field without affecting the fundamental of the said potential in order to act on the phenomena of coma appearing on the horizontal edges of the image formed on the tube screen.

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: The present invention discloses a deflection yoke for compensating mis-convergence which can compensate an error generated due to upper and lower side control unbalance during the YH compensation circuit operation by equalizing length of wires connected between upper and lower side coma free coils and connection terminals. In addition, the deflection yoke can compensate mis-convergence by compensating the error generated due to the upper and lower side control unbalance during the YH compensation circuit operation by serially connecting a resistor having a resistance value corresponding to wiring length difference of the upper and lower side coma free coils to a shorter wire.

Abstract: Disclosed is a deflection yoke having function of self-correction of inner pin distortion. More than one screen sub bent of the deflection yoke are formed between the screen bent of the deflection coil and the reference line, for improving inner pin distortion of the screen. Additionally, a section part for connecting the screen bent with the screen sub bent improves inner pin distortion of the screen together with the screen sub bent. The deflection yoke having function of self-correction of inner pin distortion does not use an additional circuit for suppressing pincushion as was in the related art, thereby reducing productivity costs, reducing power dissipation as well.

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

Abstract: A saddle-shaped deflection coil (21) for a cathode ray tube has a beginning (22) of a current-supply wire which is largely detached from a flange (17) of the deflection coil, which flange does not exhibit an impression of the beginning of the current-supply wire. The deflection coil is wound in a manner such that, after winding and baking of the coil the beginning does not have to be pulled loose from the flange, as has been customary hitherto.

Abstract: A thin cathode ray tube display system and associated components are disclosed. The system includes a thin cathode ray tube, a body having a substantially flat back element and a front element attached wherein a vacuum is maintained in the body, a neck element attached substantially perpendicular to the flat back element, wherein the neck element contains at least one electron gun for the emission of electrons, a transparent screen attached to the front element, the transparent screen having at least one phosphor layer operable to emit a photon of known wavelength and a substantially flat electron beam controller attached substantially perpendicular to the neck element operable to deflect an electron beam emitted by the at least one electron gun.

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: 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 relates to a cathode ray tube, and more particularly, to a funnel for CRT to increase the BSN neck shadow margin by changing the shape of the yoke portion.

Abstract: A funnel-and-neck sealing body comprises a funnel having a substantially rectangular large opening to which a panel for projection tube is sealed, and a circular small opening; and a neck tube of substantially a cylindrical shape sealed to the small opening of the funnel. The neck tube has an electron gun installing region for installing an electron gun therein, and a yoke mounting region for mounting a deflection yoke externally thereon, wherein an outer diameter of the yoke mounting region is smaller than an outer diameter of the electron gun installing region.

Abstract: A display apparatus comprising an evacuated envelope having an interior surface and an exterior surface is disclosed. The envelope includes a faceplate having a luminescent screen on the interior surface thereof. An electron gun is disposed within a neck of the envelope for generating at least one electron beam that is directed toward the luminescent screen. A funnel connects the neck of the envelope with the faceplate. A deflection yoke is disposed around the envelope at the junction of the neck and the funnel. The yoke is attached to the envelope with an adhesive. A resistive primer coating is disposed on the envelope and forms a barrier between the yoke adhesive and the envelope. The resistive primer coating is formed from an aqueous formulation comprising a copolymer of chloroprene and methacrylic acid, a conductive filler material and at least one cross-linking agent.

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: Disclosed is a cathode ray tube, and more particularly, a cost-effective cathode ray tube effective for minimizing deterioration of color purity and obtaining a sufficient margin for sufficient margin for a beam strike neck (BSN) phenomenon by moving a ½ center (deflection center) closer to a panel without changing the curvature of a funnel or the thickness of a glass inside the funnel.

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

Abstract: In a deflection yoke including a horizontal deflection coil, an insulation frame, a vertical deflection coil, and a ferrite core arranged in this order outwardly, on an outer wall of a minor diameter portion of the insulation frame, a plurality of elastic projections are provided that are arranged in a standing condition to hold an outer wall of a minor diameter portion of the ferrite core. The ferrite core thus can be held in an optimum position in a vertical axis direction. Preferably, the outer wall of the minor diameter portion of the ferrite core has a tapered portion having a diameter decreasing in a direction towards an end side of the minor diameter portion that is held by the elastic projections. The ferrite core thus can be held also in an optimum position in a tube axis direction. A color cathode ray tube device with reduced YH crossed misconvergence thus can be realized.

Abstract: A deflecting yoke core with which magnetic saturation is prevented by optimizing the relationship between the core sectional area and the density of the magnetic flux distribution. The deflecting yoke core to be mounted between a neck and a funnel of a cathode ray tube has a hole 2 extending from an opening end of a neck portion 3 to an opening end of a funnel portion 1. The hole 2 at the funnel portion 1 widens toward the opening end of the funnel portion 1. An outer shape at the opening end of the funnel portion 1 has a short diameter Dx1 along a minor axis X and a long diameter Dy1 along a major axis Y. Core sectional areas along a plane parallel to and passing through a core axis O1 are largest within an angular range of 30° to 65° measured around the core axis O1 from a 0° reference angle at the minor axis X.

Abstract: The present invention relates to a yoke ring for use in a deflection unit in a cathode ray tube (CRT). The 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 front-of-screen performance. In particular, astigmatism, coma and raster errors are reduced.

Abstract: The invention provides a deflection yoke comprising: a funnel-shaped core (ii) being made of a magnetic material, (iii) having, on its inner wall, ridges each of which starts from the narrower end and extends toward the wider end for a part of the length of the core, the ridges being arranged circumferentially at intervals and thereby forming core slots, and (iv) in which the remaining inner wall near the wider end is smooth; a first deflection coil wound as partially guided by the core slots; second deflection coil positioned more inward than the first deflection coil; and an insulating frame that (i) is sandwiched between the first and second deflection coils, and (ii) has, in an area corresponding to the core's smooth area, guiding slots extending along the CRT axis direction and being arranged circumferentially, wherein the second deflection coil is wound as partially guided by the guiding slots.