Abstract: Self-convergent picture display system with a color display tube and an electromagnetic deflection unit including a field deflection coil and a line deflection coil which are both of the saddle type and are wound directly on a support. The deflection unit includes a pair of magnetically permeable portions which are arranged symmetrically with respect to the plane of symmetry of the field deflection coil on either side of the tube axis. The magnetically permeable portion draws magnetic flux from the end of the yoke ring in order to extend the vertical deflection field. A self-convergent system can be realized with different screen formats by choosing different lengths of the magnetically permeable portions.

Abstract: A deflection unit for a color television picture tube having in the neck thereof an electron gun system for producing a central electron beam coplanar with two outer electron beams. The deflection unit comprises a system of line deflection coils and a system of field deflection coils. The gun end of the system of field deflection coils is provided with two plate-shaped elements of a soft-magnetic material located at a distance from each other in the circumferential direction of the neck of the tube. Such elements are movable in that direction from a neutral position in which the distances between the centers thereof and the outer beams are equal, to a position in which one of such distances is greater than the other in order to correct picture balance errors due to unequal deflection of the beams.

Abstract: A cathode ray tube deflection unit comprising a field coil system with two diametrically opposite field deflection coils and a line coil system with two diametrically opposite line deflection coils. Each coil has a front end segment (15, 18), a rear-end segment (16, 19) and conductors (17, 20) extending between such segments.

Abstract: In a color picture device having a tube envelope and an in-line type electron gun assembly disposed in a neck section of the tube envelope, a deflection unit includes a pair of first deflecting coils for deflecting three electron beams in a horizontal scanning direction coinciding with the in-line arranged direction, and a pair of second deflecting coils for deflecting the electron beams in a vertical scanning direction perpendicular to the horizontal scanning direction. A pair of permanent magnet plates is arranged individually between a funnel section and the second deflecting coils, and adapted to form a deflection magnetic field of a direction opposite to the vertical scanning direction.

Abstract: A color display tube deflection unit having an annular magnetizable core of tapered cylindrical shape and a raster distortion correction device comprising four pole shoes positioned at the corners of a rectangle adjacent the end of the core facing the display screen, the pole shoes respectively being near respective ends of a pair of vertical deflection coils. The four pole shoes are connected in pairs by respective bridging flux collector elements of soft magnetic material. The flux collector elements divert magnetic flux from the core which otherwise would not have emerged from the core, and such flux is conveyed to the pole shoes so as to cause the vertical deflection field to become pincushion-shaped adjacent the display screen.

Abstract: A pair of magnetic member for collecting leakage magnetic flux of barrel-shaped vertical deflection magnetical flux to produce an auxiliary vertical deflection magnetic field of pin-cushion type around the neck of a cathode ray tube at the part of the electron gun, wherein each magnetic member has a vertical principal face part which is to face in parallel to a vertical principal face part of the other magnetic member with regard to a vertical axis of the CRT, and a pair of bar-shaped member, that is an upper horizontal bars and a lower horizontal bars connected to the upper edge part and the lower edge part of the principal plane part and extending toward the neck of the cathode ray tube; the provision of the above-mentioned magnetic members on a deflection yoke of a color cathode ray tube decreases convergence coma and coma distortion of beam spots, and is suitable for producing color picture image with good color convergence, in especially large face wide deflection type color cathode ray tube.

Abstract: In accordance with the invention, to prevent a deflection system for a color picture tube provided with an in-line gun system from causing pincushion distortions in the east-west direction on the screen, at least two plane, thin field formers are provided for on the end face of the core for the vertical deflection coils. These field formers are made from a soft-magnetic material and are substantially in the shape of ring segments.

Abstract: A magnetic device of permanent magnet materials for the control of linearly xtending annular cross-sectioned magnetic fields formed of two concentrically nesting magnetic tubular elements defining an annular space therebetween, and inner and outer cladding magnets radially disposed around the outer of said tubular elements and interiorly of the inner of said tubular elements, the cladding magnets being thicker at the end extremities and diminishing in thickness towards and to the plane of zero magnetic potential at or near the center line of the device measured along its longitudinal axis.

Abstract: A raster distortion corrector for a cathode ray tube includes magnetically permeable corrector pieces that are located on opposite sides of the deflection yoke. A part of each corrector piece is located within the external field of the vertical deflection coils and presents a low reluctance path to the external field flux. The flux is directed via a flux channelling arm of each corrector piece to a field shaper that causes a distortion correcting field to be formed between the corrector pieces. The flux channelling arms are formed and located so that there is no significant interaction of the corrector pieces with the horizontal deflection field.

Abstract: A magnetic cladding device having a constant exterior magnetic potential al to a magnetic potential at a point between either end of an active magnet for enhancing the active magnet's field and reducing magnetic field leakage comprising a magnetic cladding circumscribing an active magnet and having a magnetic axis transverse to that of the active magnet.

Abstract: A shielded room for containment of magnetic fringe fields generated by a magnet which forms part of an NMR scanner system utilizes wall members having a thickness proportional to the amount of flux conducted. In the preferred embodiments, the shielded room can have one of rectangular, cylindrical, or polygonal geometries, for example. The walls (floors and ceilings) are constructed from staggered plates to have increased thickness where flux is greatest, and correspondingly decreased thickness where the flux is lowest. The shielded room can be, additionally, provided with end-cap elements in the walls perpendicular to the base of the magnet. Preferentially, the end-cap elements are angled away from the side wall members toward the center of the room to more closely follow the flux path.

Abstract: A color television display apparatus comprises a color cathode ray tube (1), an electron gun apparatus (4) disposed in a neck region (2) of the color cathode ray tube (1), a deflection yoke (12) having vertical deflection coils (14) wound about a toroidal-type core (13) and magnetic members (18). Each magnetic member (18) is shaped nearly like a letter U, comprising: a first portion (19) adjacent to the rear end surface of the core (13), extending in a direction perpendicular to the center axis of the neck region (2); a second portion (20) extending backward from the outer end of the first portion (19); and a third portion (21) positioned opposed to the beam exit end of the electron gun apparatus (4) outside the neck region (2), extending in a direction perpendicular to the center axis of the neck region (2).

Abstract: A deflection unit for a color television display tube comprising line and frame deflection coils and a magnet core cooperating with said coils can be manufactured by placing the deflection coils and the magnet core around the part of the transition neck-cone of a color display tube in such manner that the deflection coils engage or substantially engage the tube, which display tube comprises an adjusted color purity magnet, after which the tube is adjusted so as to be color pure by moving the magnet core along the axis of the tube, after which, if desired, the magnet core is moved in known manner in a plane perpendicular to the tube axis so as to remove convergence errors and the magnet core and the coils are then connected together to form the deflection unit.

Abstract: In a cathode ray tube apparatus having an in-line type electron gun, magnetic pole pieces comprising four pole pieces of substantially arc-shaped cross section are disposed in a cylindrical shape with circumferential gaps between neighboring pole pieces 0.degree., 90.degree., 180.degree., and 270.degree. locations on the cylinder. An additional pair of narrow width stripe-shaped pole pieces are disposed inside said cylinder at a predetermined distance from the cylinder in a manner to cover the 90.degree. and 180.degree. gaps. The apparatus acting to modify the horizontal and vertical deflection magnetic fields so that the electron beam spots on the phosphor CRT screen are substantially circular in shape without losing the self convergence effect of the magnetic fields.

Abstract: A magnet system comprises magnetic field generating means such as a superconducting magnet (12) and a shield including a number of sheets (9) of magnetic material, the size (l.sub.z, l.sub.x) and position (r) of the or each sheet (9) relatively to the magnetic field generating means (12) being such that in use at the edge of the sheet or sheets the component of magnetization (M.sub.z) parallel to the sheet in the direction of the magnetic field is less than or substantially equal to zero.

Abstract: A television receiver deflection yoke mounted on a kinescope incorporates toroidally wound vertical deflection coils which generate stray fields that undesirably interact with components of adjacent receivers or video monitors. The deflection yoke incorporates magnetically permeable field forming members which utilize the stray field flux to form an electromagnetic field at the front of the yoke to aid in side pincushion distortion correction. The field forming members comprise a flux gathering portion which is located within the region of the stray field and follows the contour of the yoke core. The flux gathering portions extend along substantially the entire length of the vertical coils and are curved to encompass a significant portion of the external surface of the core in order to reduce the undesirable effects of the stray field and to form a strong pincushion distortion correcting field.

Abstract: A deflection yoke for a color cathode ray tube is disclosed which does not cause raster distortion and avoids electron beam convergence error. Both horizontal and vertical deflection coils generate fields having a pincushion distribution. Front end magnetic members extend the pincushion type vertical deflection magnetic field toward the viewing screen of the tube. Rear end magnetic members deform one portion of the magnetic field generated by the vertical deflection coils into a barrel type so that the sum of the vertical deflection magnetic field is effectively a barrel type distribution.

Abstract: A television display system includes a kinescope producing an electron beam and a deflection yoke for deflecting the electron beam to form a raster on a display screen of the kinescope. A field forming apparatus is located external to the yoke for correcting side pincushion distortion of the raster on the kinescope display screen. The field forming apparatus comprises a pair of magnetically permeable flux gathering members located on opposite sides of the yoke within the stray field produced by the vertical deflection coils of the yoke. Flux channeling members carry the flux from the flux gathering members to flux directing members at the front of the yoke where the appropriate distortion correction field is formed. The flux channeling members include a part that extends perpendicular to the kinescope so as to place the flux directing members close to the funnel of the kinescope in order to generate a field of sufficient intensity to provide the desired amount of pincushion distortion correction.

Abstract: The deflection yoke for use in the in-line type color cathode-ray tube comprises a horizontal deflection yoke, vertical deflection yoke and core, and the vertical deflection coil is an or/and auxiliary magnetic field correcting means which generates the vertical deflection magnetic field of the screen side in the form of a pincushion. A set of correction members made of mild magnetic material consisting of circular lugs which extend in the circumferential direction of the neck of the cathode-ray tube and center lugs which extend in the direction of the tube axis are provided at the north and south positions between the horizontal deflection coil at the electron gun side of the deflection yoke and the vertical deflection coil to simultaneously correct misconvergence in the horizontal and vertical directions at the corners of the fluorescent screen.

Abstract: In a magnetic field generator mounted about a neck of a cathode ray tube for focusing an electron beam and made up of a permanent magnet, a magnetic field adjusting mechanism for adjusting field intensity produced by the permanent magnet and a magnetic member adapted to compensate for a temperature characteristic of the permanent magnet, the temperature characteristic compensating member is located at a position not affected by magnetic flux adjusted by the magnetic field adjusting mechanism.

Abstract: In a color television display system comprising a kinescope having in-line electron beams and a deflection yoke having saddle horizontal and toroidal vertical windings, a correcting apparatus comprises a magnetically permeable ring disposed at the rear of the yoke around the neck of the kinescope. Slots are formed into the ring at the top and bottom, separating it into two semi-circular segments. External flux from the deflection yoke horizontal and vertical coils is shunted into the permeable corrector and away from the focus region of the kinescope electron gun assembly, thereby improving beam focus and reducing vertical coma error. The slots formed in the ring prevent excessive flux from being shunted into the corrector which otherwise would undesirably reduce the amount of beam scan, and require a compensating increase in deflection power.

Abstract: A correction apparatus for a deflection yoke for use with a color television kinescope comprises a plurality of magnetically permeable rods disposed at the rear of the yoke. Each of the rods comprises a short portion disposed parallel to the neck of the kinescope and an elongated portion disposed perpendicular to the neck of the kinescope. The elongated portions of the rods are positioned within the external field of the vertical deflection coils. Flux from the external field is channeled into the rods to form a magnetic field between the short portions of corresponding members on opposite sides of the tube neck to provide vertical coma correction. The vertical dimension of the rods is a small fraction of the diameter of the kinescope neck in order that the high permeable path presented to the external horizontal field by the rods does not appreciably distort the external horizontal field.

Abstract: A self-converging deflection yoke having toroidally-wound vertical deflection coils incorporates a pair of magnetically permeable field formers mounted on either side of the yoke. The field formers shunt a portion of the external field flux to the vicinity of the electron gun assembly where they form a pincushion-shaped field which aids in vertical coma correction. In one embodiment, a yoke comprising planar-wound vertical coils incorporates both coma-correcting rear field formers and a pair of front crossarm assemblies for providing side-pincushion correction. The resultant yoke provides covergence of electron beams free of coma and side-pincushion distortion with reduced sensitivity to transverse motion. In another embodiment, similar results are obtained without the front crossarms by vertical deflection coil having a nonradial winding configuration.

Abstract: In a television receiver comprising a display system incorporating a kinescope having horizontal in-line electron beams and also incorporating a deflection yoke having toroidally-wound vertical deflection coils, where the kinescope utilizes a magnetically-permeable G3 focussing electrode in the electron guns to reduce deflection defocussing, an arrangement for correcting misconvergence of the electron beams caused by the magnetically-permeable G3 electrode comprises a pair of magnetically-permeable field formers disposed along and extending toward the rear of the yoke. The field formers are configured to collect a portion of the external fields generated by the vertical windings and direct those portions through the kinescope neck substantially at right angles to the electron beams in the vicinity of the exit end of the electron guns with a barrel-shaped transverse pattern.

Abstract: In a color television receiver having an in-line electron beam kinescope and deflection yoke, a correction apparatus comprises a pair of magnetically permeable field formers located on opposite sides of the yoke. A first portion of each field former lies within the external field of the vertical deflection coils and channels flux from the external field into the field formers. A second portion of each field former is configured to form a pair of feet located above and below the longitudinal axis of the kinescope. Flux channelled into the field formers is directed by the feed to form a pincushion-shaped field within the kinescope neck to correct vertical coma errors. A third portion of each field former lies forward of the feet and directs the channelled flux to form a barrel-shaped field within the kinescope neck to correct any misconvergence of the outer electron beams caused by the coma correcting field.

Abstract: A television display system comprises a kinescope, deflection yoke and magnetic field influencing apparatus. The field influencing apparatus comprises a pair of magnetically permeable members disposed on either side of the yoke. One end of each member is positioned within the external field of the toroidally-wound vertical deflection coil. The other end of each member is divided into an upper and lower field-forming arm. The upper arms of each member are disposed adjacent each other such that a gap is formed between them in the vicinity of the entrance end of the yoke. The lower arms are similarly disposed. The gaps are vertically aligned with the longitudinal axis of the kinescope. The width of the gaps is less than the spacing between the outer electron beams in the vicinity of the entrance end of the yoke. Flux from the external field is channeled into each permeable member to the ends of the field-forming arms. A field is produced between the upper arms of each member and the lower arms of each member.

Abstract: Disclosed is a deflecting device for a color cathode-ray tube which comprises a substantially tapered cylindrical core to be attached to the color cathode-ray tube, a pair of vertical deflecting coils facing each other and wound around the core to provide a barrel-distribution deflecting magnetic field, and a pair of horizontal deflecting coils inside said core for generating a pincushion-distribution deflecting magnetic field. This deflecting device further includes a correcting magnetic member arranged at the large-diameter end side of the core in the vicinity of each end of the pair of vertical deflecting coils.

Abstract: A deflection unit for in-line color television display tubes having a line deflection coil and a field deflection coil, the field deflection winding having a slightly pronounced barrel-shaped field deflection field in the middle and on the screen side of the deflection unit and being combined with field-forming means (in particular soft-magnetic segments which are placed between the line and field deflection coils) to generate a pronounced pin-cushion-shaped field on the gun side of the deflection unit. As a result of these measures, the deflection unit couples a coma-free field deflection field with a minimum EW-field distortion.

Abstract: A deflection yoke assembly includes a permanent magnet arrangement comprising first and second magnets magnetically coupled to act as a single magnet with variable strength by means of a magnetic shunt structure including castellated portions disposed adjacent to the two magnets.

Abstract: An image pickup tube is rigidly centered and mounted to a coil assembly by an adjustable split-ring clamp of hard plastic material mounted to the coil assembly. The split-ring clamp when adjusted for mounting compresses about the periphery of the faceplate or anti-halation disk extension of the tube to thereby provide a rigid mounting between the coil assembly and the tube. The rear portion of the coil assembly includes a yoke with a tapered inner surface. A split-ring wedge is forced between the tube and the rear portion of the yoke to rigidly support and center the rear portion of the tube.

Abstract: A pickup tube structure comprises an image pickup tube and a yoke assembly mounted on the pickup tube. The yoke assembly includes a magnetic shield in a specific arrangement with respect to the axis of the pickup tube, as well as beam focusing and deflecting coils. The shield is shaped in a cylindrical form with an almost linear joint portion placed in parallel with the tube axis. The angle between the plane including the joint portion and the tube axis and the plane including the direction of the magnetic field for the beam horizontal deflection and the tube axis is not smaller than about -30.degree. and is not larger than about +30.degree..

Abstract: A cathode ray tube assembly including a plurality of permanent magnets to correct for pin cushion and barrel distortion has each adjustable magnet comprising at least part of a rotatable member, facilitating the provision of means to clamp the magnet in its required position, and facilitating the provision of a rugged assembly which is suitable, for example, for use in an aircraft.