Abstract: A description is given of a pulse device for zeroing a permanent magnet to any desired operating point on its demagnetization curve, in which the strength of the demagnetizing pulse is automatically determined from the ratio between the operating point reached and the desired operating point.

Abstract: An integral field and commutation magnet for use in DC brushless motor has both commutation and field magnet portions. Magnetized segments in both the field and commutation portions have oppositely oriented magnetic fields in the outward radial direction. An apparatus and method for making the one piece integral field and commutation magnet employ a fixture with a current conductor associated with magnetic flux paths corresponding to the segments of the commutation and field magnet portions to magnetize a single piece of permanently magnetizable material.

Abstract: A demagnetization apparatus for use with magnetically based electronic article surveillance systems having a dual status anti-theft marker containing at least one demagnetizable control element which when demagnetized allows the marker to be detected by the system when the marker is present in an interrogation zone. The apparatus includes an elongated magnetic section contained within a housing which exhibits a succession of fields of alternate polarity and a portion of which exhibits generally decreasing intensities at the working surface of the housing along that portion of the section. The peak intensity of the outermost field is controlled to have a peak intensity less than that of adjacent regions. The section and a cover plate are oriented such that the external fields near the working surface are sufficient in intensities to demagnetize the demagnetizable element of the marker positioned proximate thereto while being rapidly attenuated a short distance from the section.

Abstract: A bar magnet and an instrument and method of manufacture thereof, in which the magnet is integrally formed of a single material and has circular magnetic poles at selected side portions thereof. The bar magnet is formed by snuggly fitting around an integral bar of magnetizable material, magnetic members of higher magnetic permeability than that of the magnetizable material of the integral bar, at a plurality of local locations along the length of the bar and applying a current to a coil surrounding the bar such that the bar is permanently alternately magnetized north and south axially along the sides of the bar. The coil extends axially up and surrounds the bar and metallic members, and is enclosed in a yoke. The bar magnet is applicable for use in extracting metallic substances from the stomachs of cattle.

Abstract: A method of magnetizing a rotor of a motor including the rotor made of an integrated magnet member and a stator is provided. Predetermined magnetic fields are preliminarily applied to the rotor to form magnetic paths and thereafter, the rotor is demagnetized. Then, the rotor is assembled into the stator. The rotor and stator are positioned such that the directions of the magnetic fields which are generated from the stator winding of the stator coincide with the directions of the magnetic paths of the rotor. Subsequently, in the state in which both of the rotor and stator are positioned, a current is supplied to the stator winding and the magnetic fields are generated, thereby magnetizing the rotor by the magnetic fields.

Abstract: A magnetizing device includes a two-pole electromagnet with four rollers mounted in pairs on the poles of the electromagnet and interacts with a respective guide. These guides are made as rings. The rollers are mounted on the poles by means of half-axles which are secured on each roller with a displacement in relation to the rotation axle of the roller.

Abstract: A multipolar magnetization device comprises at least one electric power source, at least two distinct current pulse generating devices and several portions of electric conductors respectively connected to at least four of said conductor portions for producing a given magnetic field portion. The magnetization device is arranged for creating a series of magnetic field portions of successive alternating polarities for producing in a magnetizable body a corresponding series of magnetized zones.

Abstract: An apparatus and method for degaussing a magnetic storage medium, such as a reel of magnetic tape, is disclosed. A pair of opposing E-laminations have windings on their respective center legs. A reel of magnetic tape is inserted in the region between the E-laminations, and is rotated. An AC potential is coupled in series across the windings, to obtain a first magnetic field orientation in the region between the E-laminations. The direction of connection of one of the windings of the series arrangement is then reversed, to electrically alter the magnetic field orientation. This provides an effective degaussing of the magnetic tape.

Abstract: In order to form, on opposite plane surfaces of a magnetizable plate portion of a part (62), a series of magnetized areas, the device comprises a frame (68) wherein two support parts (64, 65) made of a material having a high magnetic permeability presenting respectively plane polar surfaces are arranged in parallel facing each other and are coupled with portions of electric conductors arranged so as to generate between the polar surfaces of the opposite support parts magnetic field producing the magnetization of said areas. One of the support parts (65) is displaceable with respect to the other one (64) and with respect to the frame (68), perpendicularly to the polar surfaces so as to bring close and to spread apart said polar surfaces with respect to the flat portion of the parts to be magnetized.

Abstract: A magnet of permanent magnet material for use in a nuclear spin tomograph has a longitudinally extending cavity for receiving a patent, the cavity and the outer contour of the magnet being substantially rectangular. The magnet comprises simple prismatic parts which are assembled unmagnetized. Upon assembly, the magnet is magnetized so that an approximately homogeneous magnetic field prevails in the cavity and the space outside the magnet is approximately free of fields. Magnetically soft plates are disposed on the inside surfaces of two horizontal legs of the magnet.

Abstract: A miniature electric rotating machine has a stator equipped with a field pole on a peripheral circle of a rotor, and the field pole is constituted by a permanent magnet. Each permanent magnet of a miniature electric rotating machine of this type can be divided into a magnetizing side and a demagnetizing side with respect to armature reaction. In the permanent magnet of the present invention, an end portion on the demagnetizing side, which has directivity different from the magnetizing directions on the magnetizing and demagnetizing sides, is disposed adjacent to the portion on the demagnetizing side.

Abstract: A demagnetization apparatus for use with magnetically based electronic article surveillance systems having a dual status anti-theft marker containing at least one demagnetizable control element which when demagnetized allows the marker to be detected by the system when the marker is present in an interrogation zone. The apparatus includes an elongated magnetic section contained within a housing which exhibits a succession of fields of alternate polarity and a portion of which exhibits generally decreasing intensities at the working surface of the housing along that portion of the section. The section and a cover plate are orientated such that the external fields near the working surface are sufficient in intensities to demagnetize the demagnetizable element of the marker positioned proximate thereto while being rapidly attenuated a short distance from the section.

Abstract: A deactivator for deactivating targets used in electromagnetic article surveillance systems comprises a solid element with a convexly curved outer surface, e.g., a cylinder and a plurality of permanent magnets which form a patter of variously directed magnetic fields is a plane adjacent the surface. The curved surface of the deactivator is rolled over a target to be deactivated. The magnets are also arranged in adjacent layers with the magnets of one layer extending in a different direction from the magnets of the other layer to form a composite magnetic pattern which is discontinuous in all directions.

Abstract: The invention relates to magnetizing apparatus for the magnetization with coded orientation of magnetic blades (6) to be embedded into two sides of a magnetic key shank forming part of a magnetic safety lock system, wherein tapering flux-conducting soft iron shanks (2, 4) are coupled to the poles of an exciting magnet (1) of the apparatus. Between the shanks is an air gap (3) into which a feeding mechanism feeds the blades (6) to be magnetized.The magnet is a permanent magnet (1) made of intermetallic compounds of rare earth metals of shell 4f with transition metals of shell 3d by means of powder metallurgy or casting. The areas of the soft iron (2) which are contiguous to the air gap (3) are made of a material of high saturation value. The direction of the feed of magnetic blades (6) is parallel with the direction of the magnetic field (dipole) of the poles of the flux-conducting soft iron (2).

Abstract: An upper magnet and a lower magnet respectively above and below the objects to be degaussed/demagnetized. They are arranged with their fields mutually transverse, and both at 45.degree. angles to a conveyor carrying the objects between the magnets. Either or both magnets may be rotated, selectively, and they are rotated in opposite directions.

Abstract: A magnetizing device for generating magnetic poles of alternating polarity in a magnetic body includes a supporting plate of electrically insulating material having a surface formed to closely conform with the surface of the magnetic body and an electrically conductive array of low electrical resistivity which includes magnetized sections of wire, or rod, recessed in the insulating plate and positioned in such a manner as to generate the desired magnetic poles in a magnetic body when supported by the plate when the array is subjected to a high-intensity unidirectional current, the array also including cooling sections of wire, or rod, twisted in the form of a double helix, interspersed between the magnetizing sections and disposed away from the magnetic body. The electrical array may be formed by a series of short lengths of wire, or rods, the respective ends of the short lengths being twisted together to form the cooling sections.

Abstract: A method for the manufacture of an annular magnet, which comprises depositing, on the opposite sides of an annular material of magnetic substance, magnetizing members regularly spaced circumferentially in conformity with the shape of said annular material and opposed perpendicularly to each other across said annular material and forming magnetic fluxes through paired magnetizing members in alternately opposite directions thereby magnetizing said interposed annular material.

Abstract: A device for orienting magnetic particles contained in a magnetic layer on a disc-shaped magnetic recording medium along the circumference of the recording medium. The magnetic layer is provided on a substrate. The orientation is effected by a magnetic field developed by a pair of permanent magnets and which the recording medium traverses during rotation. The permanent magnets are individually shaped flat and arranged to oppose each other at their pole-faces which are common in polarity. A trailing edge of each magnet located with respect to relative movement of the rotating recording medium extends and aligns with the radius of the recording medium.

Abstract: A method of manufacturing a cathode ray tube in which magnetic poles are provided in or around the neck (4) of the envelope (1) and around the paths of the electron beams extending substantially parallel to the axis (8) of the tube, said poles generating a permanent multipole magnetic field to correct the occurring errors of convergence and color purity and frame defects of the color display tube, which magnetic poles are formed by magnetizing a configuration (17) of magnetizable material which is provided around the paths of the electron beams, which configuration is magnetized by energizing a multipole coil unit (15) by means of a combination of currents with which a static multipole magnetic field is generated and the magnetization is produced by means of a decaying alternating magnetic field which is generated by means of an alternating field coil (16) and which initially drives the magnetizable material on both sides of the hysteresis curve into saturation.

Abstract: An apparatus and method for selectively orientating a ferrimagnetic body along a selected temperature invariant crystallographic axis includes a first pair of coils disposed for producing a magnetic field along a first direction, and a second pair of coils disposed within the first pair of coils for producing a magnetic field along a second direction, the direction of such second field being displaced at a predetermined angle .theta., with respect to the direction of said first field. A platform upon which the ferrimagnetic body is supported is disposed at an intersection of such fields and has a surface disposed at a predetermined direction with respect to a horizontal plane. A series of alternate pulsed magnetic fields is generated in turn by each pair of coils and the body rotates in response to each one of such fields. After pulsed fields have been generated, the so-called "easy axis" of the crystallographic structure of the body is aligned with the axis of the coils.

Abstract: A method for degaussing a magnetic storage medium, such as a reel of magnetic tape, is disclosed. In the disclosed method, the reel of magnetic tape is simultaneously rotated on its axis and subjected to an applied transverse magnetic field substantially in the plane of the reel. The transverse magnetic field is applied first in one direction and then in the opposite direction. An axial magnetic field, substantially parallel to the axis of the reel, is then applied, first in one direction and then in the opposite direction. In the preferred embodiment, the step of applying an axial magnetic field includes applying axial magnetic fields in alternating directions at successively decreasing amplitudes. In the disclosed apparatus, the transverse magnetic field is obtained using a lateral coil which passes over and under the reel and covers about half the reel. The axial magnetic field is obtained using a ring-shaped coil surrounding the periphery of the reel.

Abstract: There is disclosed a magnetic assembly for use in orienting the magnetic particles which are orientable under the influence of a magnetic field. A non-magnetic housing assembly defines a storage area containing a plurality of discrete permanent magnets. Provided is an assembly for attracting the magnets to the interior of the assembly and a cover assembly which serves to restrain and protect the magnets. Such a cover assembly is made of a material which does not inhibit the natural extension of the lines of flux of the fields of the magnets.

Abstract: A device for magnetizing multipolar permanent magnet bodies employs a supporting structure comprising a series of superimposed sheets of electrically insulating material, which may be of fiberglass, with prepared apertures to receive an electrically conductive magnetizing winding; the apertures may be arranged to firmly support the winding to prevent displacement despite the strong magnetic fields generated by a high current impulse discharge, and the winding can be arranged to produce a variety of polar patterns, by providing a suitable opening in the supporting structure on cylindrical magnets. The supporting structure includes at least one plate having a plurality of magnetic poles disposed about the inner perimeter of its aperture.

Abstract: In a first method, a meander-shaped coil (20,21) is provided on each side of the mask (7) having apertures (9). The coil (21) is oriented perpendicularly relative to the coil (21). If a current flows through the coils (20,21) in the correct direction, a magnetic quadrupole is formed along the circumference of each aperture (9). In a second method, a holder (30,31) with permanent magnetic strips (32) is provided on each side of the mask (7). The strips (32) in the one holder (30) are oriented perpendicularly relative to the strips in the other holder (31).A coil 40 is provided around the holders 30 and 31 with which a decaying magnetic alternating field, is generated which initially drives the material of the mask (7) on both sides of the hysteresis curve into saturation. After the decay of said alternating field a magnetic quadrupole is present along the circumference of each aperture (9).

Abstract: A desensitizer apparatus for use with magnetically based electronic article surveillance systems having a marker containing at least one magnetizable section which when magnetized, alters the response of the marker produced by an alternating magnetic field provided in an interrogation zone. The apparatus includes a magnet assembly having an elongated permanent magnet section and a pair of elongated pole pieces which concentrate external fields produced by the magnet sections near a gap extending the length of the magnet section, the external field near the gap being sufficient in intensity to magnetize the magnetizable section of a marker positioned proximate thereto, and being rapidly attenuated a short distance from the gap. Accordingly, magnetically sensitive articles such as prerecorded magnetic recording cassettes to which the markers are affixed are not affected.

Abstract: A device for magnetizing multipolar permanent magnet bodies employs a supporting structure comprising a solid block, or a series of superimposed sheets, of electrically insulating material, which may be of fiberglass, with prepared apertures to receive the electrically conductive magnetizing winding; the apertures may be arranged to firmly support the winding to prevent displacement despite the strong magnetic fields generated by a high-current impulse discharge, and the winding can be arranged to produce a variety of polar patterns on flat magnets or, by providing a suitable opening in the supporting structure, on cylindrical magnets.

Abstract: In a first method, a meander-shaped coil (20,21) is provided on each side of the mask (7) having apertures (9). The coil (21) is oriented perpendicularly relative to the coil (21). If a current flows through the coils (20,21) in the correct direction, a magnetic quadrupole is formed along circumference of each aperture (9). In a second method, a holder (30,31) with permanent magnetic strips (32) is provided on each side of the mask (7). The strips (32) in the one holder (30) are oriented perpendicularly relative to the strips in the other holder (31) A coil 40 is provided around the holders 30 and 31 with which a decaying magnetic alternating field is generated which initially drives the material of the mask (7) on both sides of the hysteresis curve into saturation. After the decay of said alternating field, a magnetic quadrupole is present along the circumference of each aperture (9).

Abstract: A method of and apparatus for changing the magnetic forces generated by and between a pair of magnetic assemblies spaced apart along a given path, by selectively positioning these fields with respect to each other.

Abstract: The process for magnetizing two opposite surfaces of a magnetizable body according to predetermined vectors includes the engagement of two magnetizing heads with each surface and rotation of the two heads relative to each other through a compensating angle corresponding to the angular deviation of actual magnetization from the desired position of magnetization vectors. Apparatus for performing such magnetization involves two juxtaposed magnetizing heads which are rotatable relative to one another.

Abstract: Apparatus is provided for uniformly premagnetizing magnetic media, such as wide magnetic tapes and/or for substantially uniformly orienting the magnetic particles in the slurry of the magnetizable layer of magnetic media during their formation. Premagnetization constitutes magnetizing the medium in a preselected direction, such as the transverse direction (i.e., perpendicular to the intended direction of movement of the recording medium past a recording head but in the plane of the medium), prior to magnetically recording information thereon. The apparatus comprises a number of predeterminably arranged small magnets disposed proximate to the medium which obviates the need for large, expensive, heavy magnets and magnet systems. A continuous transverse saturation level of magnetization is provided in the medium with virtually no vertical or longitudinal magnetic components or anomalous effects.

Abstract: An apparatus is disclosed for magnetizing the convergence device of a color-picture tube including electrically excitable coils disposed around the tube neck and having their axes located in the convergence device plane. The cross sections of the coils in the convergence-device plane are greater than those perpendicular to this plane. This adaptation of the symmetry of the magnetizing coils to the symmetry of the convergence device makes it possible to exert a strong influence on the convergence device.

Abstract: A device for magnetically orienting the magnetizable particles of magnetic recording media in a preferred direction, which media are obtained by applying a coating of anisotropically magnetic particles finely dispersed in a solution of an organic binder system and conventional additives to a non-magnetic base, and subsequently solidifying the coating, by the action, on the still fluid coating, of the magnetic fields produced by two E-shaped electromagnets arranged symmetrically with respect to, and in mirror-image relationship to, the plane of the said coating.

Abstract: Apparatus for magnetizing permanent magnet bodies to provide them with narrow magnetic poles of alternating polarity consists of arranging an array of pairs of magnetizing conductors in such a manner that when each of the two conductors of each pair are connected in series each of the pairs of conductors can be connected in parallel directly to the two common magnetizing current supply leads.

Abstract: A process and apparatus for permitting the magnetization of materials in the form of sheets or strips, such as magnetic rubber, wherein one or two stacks formed by flat main magnets 1 adjacent to ferromagnetic pole pieces 2 in the vicinity of which (or between which) travels the strip to be magnetized. The main magnets adjacent to the same pole piece having opposing magnetizations as well as the magnets located face to face in each of the stacks. The device can be completed by field magnets .delta. and intermediate magnets 9.

Abstract: A demagnetizing device for a cassette tape player includes a cassette shell which defines a generally oval-shaped guide track extending around the interior of the shell. A magnet assembly is provided with shafts which fit within the guide track such that the magnet assembly is free to rotate within the guide track and to translate along the length of the guide track. The magnet assembly is rotated by a drive belt which in turn is driven by two hubs rotatably mounted in the cassette shell. An automatic shutoff lever is disclosed which acts automatically to shutoff a tape player equipped with automatic shutoff features when the magnet assembly reaches one of two predetermined positions on the guide track. By properly positioning the guide track, the single magnet assembly can be used to demagnetize multiple components of a tape player distributed around the cassette shell. For example, the single magnet assembly can be used to demagnetize two capstans and a tape head in a single operation.

Abstract: A magnetizing system including a FLIP-FLOP and an integrating circuit operative to control a conduction phase of a unidirectional thyristor through a gating circuit so as to supply to an iron-core coil an increasing magnetizing current from an AC source through the thyristor so as to magnetize a horseshoe steel member. When a comparator determines that the magnetization amount of the steel member, sensed by a Hall effect element, equals 1.2 to 1.3 times a reference amount, the magnetizing current is stopped. Similar components for effecting demagnetization are then operated in the same manner so as to demagnetize the steel member with an increasing unidirectional current opposite in sense to the magnetizing current or an increasing bidirectional current until the sensed magnetization amount equals the reference amount. At that time, the demagnetizing current is stopped.

Abstract: A demagnetizing coil is situated in an aperture frame removably mounted around the picture screen of a picture tube.

Abstract: A magnetizing system includes a transformer core, a first winding surrounding the core and a tube-like second winding surrounding the first winding. The second winding is formed with a slot on its upper surface and has a portion located within this slot and extending beyond the upper surface of said tube. This portion is formed with a cross-section of a size substantially smaller than the size of the slot to produce a magnetic field of high density. A screening socket is positioned adjacent the material to be magnetized. This socket is made of a material having good electrical conductivity for absorbing the stray fields so that the material to be magnetized is exposed to the magnetic field produced by said extended portion.

Abstract: A barium ferrite layer is disposed around an external surface of neck portion of a color cathode ray tube to have a magnetic easy axis radially of the longitudinal axis of the neck portion. An electromagnet is revolved around the layer to magnetically charge it so as to correct static convergence and color purity of three electron beams generated in the color cathode ray tube.

Abstract: This invention provides an improved method and apparatus for manufacturing magnetic recording media; specifically, that which is to be used in the manufacture of flexible, magnetic recording disks. The process provides a sequence of disorienting magnetic fields in different directions and of diminishing strengths to form a magnetic media in which the magnetic particles are essentially disoriented and the media is, thereby, devoid of modulated signal envelopes.

Abstract: A magnetic transformer device includes a cylindrical transformer core, a first winding surrounding the core and a second winding surrounding the first winding. The second winding is formed as a ring-like element with a slot on its upper surface and has a portion located within this slot and extending beyond the upper surface of the second winding. This portion is formed with a cross-section of a size substantially smaller than the size of the slot to produce a magnetic field of high density.

Abstract: A nonelectric magnetizer and demagnetizer in the form of three flexible permanent magnets, approximately crescent U shaped, each having only one same magnetic pole on its main curved in surface and the opposite magnetic poles on their main curved out surfaces, with two of the flexible permanent magnets pliably mounted on one backing, having their curved in surfaces angularly facing each other, and the other magnet mounted on a separate backing manually movable so that the three magnets can form an adjustable air gap from substantially all directions within which a workpiece can be inserted and withdrawn to be magnetized, and the curved outside of the single magnet capable of demagnetizing various workpieces.

Abstract: A method of magnetizing an erasing head for small type tape recorders is disclosed. An erasing head having its opposite ends formed in at least one convex surface is disposed in a space formed between at least two opposed electromagnetic poles. That surface of the electromagnetic pole which is opposed to the convex surface of the erasing head is made concave which corresponds in curvature to the convex surface of the erasing head such that a tangential direction of a tape travelling movement is perpendicular to a direction of a magnetic flux of the erasing head. In addition, a center axis of the erasing head is mechanically aligned with a center axis common to both the opposite electromagnetic poles by means of a jig such that a widthwise direction of a tape is perpendicular to the direction of magnetic flux of the erasing head.

Abstract: A permanent magnet orients magnetic particles on a tape in a desired direction along the tape length (or, by rotating the magnet structure, at any desired angle to the tape length) while the tape moves past the magnet's gap. The magnet's poles are asymmetric about a time drawn through the gap center and perpendicular to the medium to first present an unfocused low intensity magnetic field to the tape followed by a narrowly focused high intensity field in the opposite direction, which latter field aligns a large proportion of the particles along desired parallel lines. Antennae attached to the pole pieces dissipate any additional undesired fields which might adversely affect the particle alignment achieved by the high intensity field.

Abstract: Disclosed is an iron core assembly for magnetizing columnar permanent magnet, particularly columnar ceramic permanent magnets adapted for use in magnetic-brush type electrostatic developing apparatus. The invention is to clarify the magnetic pattern most effective for the development, as well as a construction for presenting such a pattern, and is aiming to provide a magnetizing iron core assembly having an improved construction of magnetic poles and magnetizing coil windings.

Abstract: A core assembly for magnetizing a columnar permanent magnet, especially a columnar ceramic permanent magnet, adapted for use in an electrostatic developing apparatus of magnetic-brush developing type. The magnetizing iron core assembly has a specific arrangement of magnetic poles and magnetizing coil windings for providing a specific pattern of magnetic flux distribution which would provide the most efficient development.

Abstract: Disclosed is an improved dies set for magnetizing a cylindrical or columnar magnet adapted for use in an electrostatic developing apparatus of magnetic-brush developing type. The dies set is intended for imparting axially extending and circumferentially alternating magnetic poles to the periphery of the cylindrical columnar permanent magnet. The magnetizing dies set of the invention has a specific pattern of magnetic pole arrangement for rendering the distribution of magnetic attracting force, which is to be permanently applied to the peripheral surface of the columnar magnet in the magnetic developer, so that the attracting force becomes as uniform as possible, over the entire periphery of a shell surrounding the permanent magnet.

Abstract: Disclosed is a magnetic core assembly for magnetizing columnar permanent magnet, particularly columnar ceramic permanent magnet adapted for use in magnetic-brush type electrostatic developing apparatus. The invention is to clarify the magnetic pattern most effective for the development, as well as a construction for presenting such a pattern, and is aiming to provide a magnetizing iron core assembly having an improved construction of magnetic poles and magnetizing coil windings.

Abstract: A magnetizing apparatus for use in the static convergence of three in-line electron beams within a color television receiver cathode ray tube comprises two pluralities of windings. Each plurality is suitably arranged for positioning about a neck portion of the cathode ray tube in proximity to a magnetic material located adjacent to the neck. The windings are adapted to receive a magnetizing current for creating permanently magnetized regions within the magnetic material for producing a magnetic field within the cathode ray tube. The first plurality provides for like motion of the outer electron beams for which a first multiplicity of windings provides for like motion in a first direction and a second multiplicity provides for like motion in a direction substantially orthogonal to the first direction.

Abstract: A cathode ray tube of a color television receiver includes a magnetic material located adjacent to a neck portion. A magnetizing apparatus is used for establishing the color purity of three in-line electron beams within the cathode ray tube. The magnetizing apparatus comprises at least two elongated conductor loops arranged for positioning about the neck in proximity to the magnetic material and capable of being energized by a magnetizing current for creating permanently magnetized regions within the material. The magnetized regions produce a color purity magnetic field within the cathode ray tube for establishing the color purity of the three in-line electron beams. An elongated portion of each of the conductor loops follows along a portion of the periphery of the neck.