Abstract: In addition to the correction magnets commonly used in the electron-gun system of a color-picture tube for color purity and dynamic convergence, one or more additional correction magnets are fixed in or on the electron-gun system. During final adjustment of the color-picture tube, the usual and additional correction magnets are adjusted in turn using the same magnetizer.

Abstract: In a color display tube having an electron gun of the "in-line" type for generating three electron beams situated with their axes in one plane, the electron gun includes curved field shapers at the end from which the beams exit into frame and line deflection fields. Each field shaper includes two or more plates of ferromagnetic material aligned along a curve and spaced from each other by slots. The plates are arranged symmetrically with respect to the plane and the central beam axis, and a concave side of each field shaper faces the three beam axes. At least the ends of each field shaper which are most remote from the plane have substantially flat plates extending in the direction of the central electron beam axis. By using such field shapers the losses in the line deflection field are small and substantially undistorted, while a desirable pincushion-shaped distortion of the frame deflection field is intensified.

Abstract: A high definition page display system for graphics and text utilizing multiple beams in a CRT is disclosed. Information for the several lines which are written simultaneously is made available in parallel. The invention is described in terms of a character set and text generation, but the same principles apply to any other graphic or bit map and to storage in ROMs or loadable RAMs. Each beam of a multiple CRT tube is biased to generate a portion of a character of graphic as it scans across the tube. It takes 12 lines to scan a character with a N-beam tube, 12 over N character scans are therefore required. With the same scanning speed as with a single beam, this factor can be used to increase definition (i.e. number of lines). Also the advantage of multiple beams can be used to reduce scanning speed, if this is useful to improve brightness or spot definition, or to increase the number of dots per line.

Abstract: An in-line electron gun is constructed according to the present invention such that the common center axes (18b), (18c) of side beam apertures (16b), (16c) of a control electrode (12) and an accelerating electrode (13) are displaced toward a tube axis (19) from the center axes (21b), (21c) of the side beam apertures defined in the end surface of the focussing electrode (14) on the side of the accelerating electrode, and the common center axes (24b), (24c) of the side beam apertures (23b), (23c) defined in the opposite end surfaces of the focussing electrode (14) and the anode electrode (15) are displaced toward the tube axis (19) from the common center axes (18b), (18c) of the side beam apertures (16b), (16c) of the control electrode (12) and the accelerating electrode (13).

Abstract: In a deflection means 11 having a field of pin-cushion type flux distribution, at least a pair of T-shaped magnetic pole pieces 9, 10 are disposed between the front end of an electron gun 2 and the center part of the deflection means 11, thereby to form a barrel type flux distribution, to attain high resolution even at peripheral part of the fluorescent screen.

Abstract: A cathode ray tube including first and second cathodes mounted parallel to each other in the horizontal direction, and a deflecting device disposed along the passages of the first and second electron beams which are emitted from the first and second cathodes so as to apply to the first and second electron beams a rotational force with the axis of the tube as its center, and whereby the first and second electron beams impinge on the phosphor screen at positions which are spaced apart from each other by a distance of approximately half the distance between adjacent scanning lines in the vertical direction.

Abstract: A high definition page display system for graphics and text utilizing shaped beams in a CRT is disclosed. Information for the several lines which are written simultaneously is made available in parallel. The invention is described in terms of a character set and text generation, but the same principles apply to any other graphic or bit map and to storage in ROMs or loadable RAMs. Each beam of a multiple CRT tube is biased to generate a portion of a character or grahic as it scans across the tube. It takes 12 lines to scan a character with a N-beam tube, 12 over N character scans are therefore required. With the same scanning speed as with a single beam, this factor can be used to increase definition (i.e. number of lines.) Also the advantage of multiple beams can be used to reduce scanning speed, if this is useful to improve brightness or spot definition, or to increase the number of dots per line.

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 color cathode ray tube has a three beam, in-line electric gun in one end of the tube focused on a phosphor screen on the other end of the tube. A common magnetic deflection field controls all three beams, thereby causing a coma distortion, if not corrected. The three beams pass through three aligned apertures in the bottom of a shield cup which corrects the distortion. As a result, eddy currents might form around the apertures to defeat its corrective functions. These eddy currents are eliminated by slender cuts formed in the shield cup and radiating from the two outside apertures.

Abstract: A cathode-ray tube 10 with a deflection system 15 and an electron gun 14 having a magnetic ring 19 attached thereto is designed so that the magnetic ring 19 is not covered by the deflection system 15. To achieve this, the magnetic ring 19 is placed further to the back of the color-picture tube 10 than in conventional tubes, and/or the deflection system 15 is made shorter at the back. On an adjusting apparatus comprising both a magnetizing device and a deflection-system-positioning device, the magnetization of the magnetic ring and the positioning of the deflection system of such a tube 10 can be performed simultaneously and independent of each other. The measure can be taken on all tubes having a deflection system 15 and a magnetic ring 19 for adjusting the positions of at least two electron beams; in the case of color-picture tubes, color purity and static convergence are adjusted with such a ring.

Abstract: The present invention provides an improvement in a color picture tube having an inline electron gun for generating and directing three inline electron beams, comprising a center beam and two outer beams, along initially coplanar paths toward a screen of the tube. The beams pass through a deflection zone adapted to have two orthogonal magnetic deflection fields established therein. A first of the fields causes deflection of the beams perpendicular to the inline direction of the beams, and a second of the fields causes deflection parallel to the inline direction of the beams. The improvement comprises the electron gun including four magnetically permeable members located near the exit of the electron gun in a fringe portion of said deflection zone. A first and a second of the members are located between the center beam path and a first and second outer beam path, respectively.

Abstract: Planar apertured shunts surrounding the outer apertures of the final convergence electrode of a color cathode ray tube electron gun, used for correction of the beam-deflecting magnetic fields associated with the outer electron beams, are captivated by apertured retaining means, having shunt-accommodating pockets surrounded by a peripheral seating rim affixed to the bottom of the convergence electrode.

Abstract: A magnetic focusing type cathode ray tube includes a magnetic yoke assembly, for magnetically focusing and converging three in-line electron beams, having a pair of magnetic yokes opposing each other with a predetermined gap therebetween. The magnetic cylinders on the cathode side are so formed as to have a strong magnetic shield effect while the magnetic cylinders on the screen side are weak in magnetic shield effect. The radial components in the magnetic field produced in the magnetic gap, which act on the side beams in a direction perpendicular to an in-line direction, are reverse in polarity on the cathode side and screen side so that radial components emerge so as to converge the beams in a tube axis direction.

Abstract: A magnetic focusing type cathode ray tube comprising a magnetic focusing device positioned in front of a three beam in-line type cathode for focusing the electron beam emitted from the cathode. The magnetic focusing device is constructed of a magnetic yoke assembly having a pair of magnetic yoke members. Each magnetic yoke member has three cylindrical magnetic yoke portions through which an electron beam can pass, and one common cylindrical magnetic yoke portion having a larger diameter which completely surrounds the three electron beam passages. The cylindrical magnetic yoke portions of the yoke members are spaced equidistantly, facing each other in the electron beam passages.

Abstract: An improved in-line type electromagnetic focusing cathode-ray tube which comprises magnetic yokes, a focusing magnetic field generating permanent magnet, a deflecting magnetic field control element and a cup-shaped spacer member for separating the magnetic yokes from the deflecting magnetic field control element. The deflecting magnetic field control element is disposed at a distance l.gtoreq.0.26 D from an end of the magnetic yoke closest to a fluorescent screen, where D is an outer diameter of the magnetic yoke, so that a beam spot on the fluorescent screen has substantially circular shape to attain an excellent focusing characteristic.

Abstract: In a device for displaying pictures with a display tube and a self-converging system of deflection coils, the focusing in the direction in which the focusing is substantially independent of the deflection by the system of the deflection coils is effected by means of two quadrupole lenses and in the direction at right angles thereto by the focusing lens. This makes it possible to use dynamic focusing in said latter direction without defocusing in another direction and to obtain a sharp spot all over the screen. By providing an octupole lens coaxially around the electron beam and the center of the focusing lens it also becomes possible to reduce the spherical aberration.

Abstract: A television cathode ray picture tube has an in-line electron gun for generating three coplanar electron beams. The raster pattern projected by the center beam is diminished in vertical height so as to be non-coextensive with the superimposed raster patterns projected by the off-axis beams. The method according to the invention for providing raster coextensiveness comprises embracing each off-axis beam at the point of beam egress from the gun with a pair of inwardly converging but non-intersecting magnetic field enhancer means in symmetrical relationship and defining an opening therebetween. Each member of the enhancer means is oriented at a predetermined convergence angle with respect to the plane of the three beam paths, and located at a predetermined distance from the tube axis.

Abstract: In a television deflection device which is mounted on a color cathode ray tube, a frustoconical supporting member (3) has a pair of coil halves (6) and (7) which form horizontal deflection coils halves. These coils have longitudinal portions (11, 12, 14 and 15) which extend to the front and the rear of the supporting member (3), an elongate tapered spacer (17) and (18) being inserted in the spaces between adjacent longitudinal portions of these coils. Movements of the spacers (17) and (18) adjust the space between the longitudinal portions which provides mechanical means for correcting for asymmetries in the display device.

Abstract: An electromagnetic deflection type picture tube has (a) a first field-control element which is disposed between the electron-beam emission end of an electron gun and a deflection yoke, comprising a pair of magnetic pieces disposed on the opposite sides of the path of an electron beam and being adapted to produce or introduce a barrel- or pincushion-like local field distortion which is opposite to a pincushion- or barrel-like deflection field distortion produced by the deflection yoke by introducing the rise portion of the deflection field; and (b) a second field-control element which is disposed between the electron-beam emission end of the electron gun and the first field-control element, comprising a pair of magnetic pieces disposed on the opposite sides of the path of the electron beam and being adapted to produce or introduce a pincushion- or barrel-like local field distortion which is opposite to the barrel- or pincushion-like local field distortion produced by the first field-control element.

Abstract: The picture image display apparatus in accordance with the present invention comprises:a flat type vacuum enclosure having a transparent face panel,an electron beam emitter which emits a predetermined number of electron beams disposed in a row in selected positions,a row of control electrodes to control intensities of said electron beams,a row of parallel deflection electrodes, every other one of them being first electrodes commonly connected each other, the other ones of them being second electrodes commonly connected to each other,a phosphor screen formed on the inner face of said face panel and,an anode of thin metal film formed on said surface of said phosphor screen,wherein the apparatus is characterized in thatevery gap defined by one of said first electrodes and one of said second electrode neighboring thereto form deflection electric fields of opposite directions to each other, and said gaps are disposed in a manner that said electron beams simultaneously pass through every said deflection gap.

Abstract: If in a device for displaying colored pictures comprising a color display tube of the "in-line" type, which comprises magnetized means for maintaining a static magnetic multipole magnetic field near the output of the electron gun system for carrying out static beam corrections, a correction magnet is provided outside the neck near the output of the electron gun system and near at least one outermost electron beam, which magnet forms a magnetic dipole and is intersected by the said plane and which correction magnet is small with respect to its distance to said electron beam, it is possible afterwards to provide small corrections in the horizontal static convergence.

Abstract: A color picture tube has an inline electron gun for generating and directing three electron beams, comprising a center beam and two outer beams, along coplanar paths toward a screen of said tube. The three beams pass through a deflection zone adapted to have vertical and horizontal magnetic deflection fields established therein. The improvement comprises the inclusion of first means for weakening the effect of a portion of the horizontal magnetic deflection field on the center electron beam. Such means include elongated magnetic members located between the outer beams and the center beam with the direction of elongation being perpendicular to the plane of the electron beam paths. Also included are second means for weakening the effect of portions of both deflection fields on the two outer beams. The second means includes magnetic shield members completely surrounding each of the outer beam paths.

Abstract: An apparatus and method for forming scanned electron beam patterns which finds particular use in multiple beam cathode ray tubes. Instead of using the vertical line array of electron beam sources which is used in conventional multiple beam tubes, a two dimensional expanded beam array is provided. The expanded array is such that no two electron beams in the array are disposed in the same scan line and it is of a geometric shape having comparable length and width dimensions. In order to form characters or other patterns logic circuitry is provided to control each beam of the expanded array at respective scanning positions as the array is deflected or scanned across the screen of the cathode ray tube.

Abstract: Because the deflection fields in color television display tubes on the display screen side often have a pin-cushion-shaped and barrel-shaped field distribution, a defocusing of the electron beams occurs upon deflection. By forming the barrel-shaped deflection field on the display screen side of the display tube so as to be pin-cushion-shaped on the neck side near each electron beam and simultaneously deforming the deflection field which is pin-cushion-shaped on the display screen side of the display tube so as to be barrel-shaped on the neck side near each electron beam, the effects of said defocusing of the electron beams as a result of the deflection are considerably reduced. The haze occurring in the vertical direction is also reduced.

Abstract: A multiple beam cathode ray tube having diminished off-axis aberrations and a reduced length. A tube having a flat or planar electron beam emitter means, focussing means and deflection means is provided. A novel accelerating means is provided for accelerating the emitted beams while causing them to converge towards a crossover point which is located not closer to the screen of the tube than the deflection means. The maximum off-axis distance of the beams when traversing the focussing and deflection means is reduced, and the off-axis aberrations are correspondingly diminished.

Abstract: A color picture tube comprises the vacuumed tube envelope formed by a face plate having a plurailty of phosphor strips regularly formed on the inner surface, a funnel section having an enlarged end opening on which the face plate is mounted a skirt section on which deflection yoke is mounted and neck integrally formed with the funnel section and having located therein an electron gun assembly for emitting electron beams. A shadow mask having a plurality of slits therein is disposed to face to the inner surface of the face plate. The shadow mask is provided on an integral mask frame by which the shadow mask is secured to the inner surface of the tube envelope. The mask frame has an inner shield secured thereto along the inner circumference of the envelope. The inner shield is coupled to a permanent magnet member faced to the inner surface of the envelope.

Abstract: A multiple beam cathode ray tube having an improved cathode-grid structure which facilitates grid lead connections and mounting. The cathode means has a plurality of openings which are arranged in an array pattern which is identical to the desired electron beam array pattern, and has an emitter means associated with each opening for emitting a group of electrons. The grid means is located behind instead of in front of the cathode means and is comprised of a plurality of grid elements mounted on a substrate. When appropriately biased, the grid elements cause groups of electrons which are emitted by the respective emitter means to flow through the corresponding openings in the cathode in the direction of the screen, thus establishing the required electron beams.

Abstract: A multiple cathode X-ray tube for densitometers.This tube contains an anode assembly functioning by transmission, which is arranged along the sides of a regular convex polygon, with several cathodes, each of which sweeps one side of the polygon and a collimation device with several openings placed in front of the anode assembly to produce a series of fine, parallel and coplanar beams, the number of beams being equal to the number of openings. Such a tube makes very fast tomography possible.

Abstract: By deflecting the electron beams before the focusing lenses in an electron gun system for a color display tube towards the tube axis by non-symmetrical lens fields so that they converge on the display screen, it has proved possible to obtain symmetrical focusing lens fields by means of mechanically non-symmetrical electrodes the axes of which are parallel, if the beams enclose a given angle with the gun axes. This enables an easy manufacture of the electrodes and an accurate assembly of the guns. In these guns the focusing of the beams is independent of the convergence.

Abstract: In an in line type electron gun structure for a color picture tube wherein electron guns are arranged in line, the electron-beam-pass apertures of at least one set of corresponding electrodes of the respective electron guns for forming pre-focus lens are made rectangular having corners in the directions of the horizontal and vertical deflection magnetic fields.

Abstract: In a self-converging inline cathode ray tube assembly having a convergence electrode with a flat base and a central and two outer apertures formed for passage of electron beams, a pair of substantially flat sheets of ferromagnetic material having a substantially U-shaped configuration are disposed in mirror-image relationship intermediate the central aperture and each one of the outer apertures with the open portion of the U-shaped configuration directed toward the outer apertures whereby the deflection field of the electron beam passing through the central aperture is relatively strengthened and the deflection fields of the electron beams passing through the outer apertures are relatively weakened to provide an enhanced vertical and horizontal scanning raster for the cathode ray tube.

Abstract: An inline electron gun includes means for weakening the effect of a portion of the horizontal magnetic deflection field on the center electron beam and for strengthening the effect of a portion of the vertical magnetic deflection field on the center electron beam. The means includes magnetic shield members completely surrounding the paths of the outer beams. Each of the members has a portion that crosses the plane of the co-planar electron beam paths that is closer to the center beam path than to the outer beam paths. In a preferred embodiment, large shunts surrounding the outer beams are offset eccentrically toward the center beam relative to the outer beams.

Abstract: In a color cathode ray tube including an electron gun means for projecting three electron beams in an in-line arrangement, there is provided deflection defocus correcting means which are disposed adjacent the side electron beams for neutralizing the deflection defocus of the side beam caused by the non-uniformity of the deflection fields.

Abstract: A color picture reproducing tube utilizes three coplanar electron beams. Convergence of the three beams along at least one axis is accomplished by a deflection assembly producing a magnetic deflection field with particular astigmatism characteristics which also elliptically distorts each of the three beams in a first direction. The electron gun assembly within the picture tube includes apertured electrodes which predistort the beams elliptically in a second direction orthogonal to the first direction of distortion.

Abstract: A dual-beam cathode-ray tube having a pair of electron guns and associated deflection means disposed side-by-side on each side of a central axis is described in which the electron guns are parallel and the deflection means includes beam centering plates and angled horizontal deflection plates to direct the electron beams toward the central axis, precluding the need for a large-diameter tube neck in which the entire gun structures are angled. Bowing control plates are disposed adjacent the beam centering plates to minimize trace bowing, and an intergun shield is disposed between the horizontal deflection plates to control and correct display pattern geometry distortion.

Abstract: A cathode ray tube having three electron guns in one plane which are deflected by a self-converging deflection coil. In order to obtain circular electron spots, the tube includes an astigmatic electron lens which restricts the dimension of the electron spots perpendicular to this one plane.

Abstract: A cathode ray tube is disclosed in which an electron beam is deflected to scan a phosphor screen for producing a picture thereon, and which has an electrostatic beam control device for deforming the cross section of the beam so as to compensate for the distortion in shape of the beam landing spot on the screen at its peripheral portion caused by the beam deflection and a magnetic beam control device for deforming the cross-section of the beam dynamically in response to the beam deflection so as to compensate for the distortion in shape of the beam landing spot on the screen at its central portion caused by the electrostatic beam control device.

Abstract: A flat cathode ray tube device is provided with a monolythic structure for x-y control of a matrix of electron beams. A sandwiched deflection control structure has holes through which the beams may pass and forms a set of x-y control of the trajectory of the beams. A plurality of like mesh plates make up the control structure with offset shield provisions therein in the region of the path of each of said beams.