Abstract: A monochrome cathode ray tube including a magnetic focusing device provided with means for generating a static magnetic focusing field. These means surround the neck of the cathode ray tube without contacting this neck, and a system of correction coils for generating an additional focusing field and 2-, 4- and/or 6-pole fields is provided coaxially between these means and the neck of the tube.

Abstract: A cathode ray tube, such as a blue luminescing projection television display tube including, in an evacuated envelope (1), an electron gun (5) for generating an electron beam (6) which is focused to a spot (8) on a display screen (7) by means of an electrostatic focusing lens (27, 30) and which is deflected across this display screen (7) in two mutually perpendicular directions (x, y). A structure (37) magnetized as a four-pole and consisting of a magnetic half-hard material is provided at the area of a focusing lens formed by two electrodes (27, 30) and coaxially around the gun axis (20), the axes of the four-pole being located centrally between the deflection directions. The structure (37) extends the spot in the vertical direction so that phosphor saturation, particularly in blue projection tubes is reduced.

Abstract: A deflection yoke arrangement with geometry correction includes horizontal and vertical deflection coils for scanning a raster pattern on a phosphor screen of a cathode ray tube. A support housing suitable for positioning about the neck of the cathode ray tube contains the coils and has a front rim formed with a plurality of slots near the outer periphery. A plurality of brackets formed from magnetically permeable material are located in corresponding ones of the slots. Each bracket comprises two flat end sections joined to opposite sides of a flat central part at substantially right angles thereto. One of the flat end sections of each bracket collects magnetic flux generated by the coils and channels the flux via the central part to the other end section. The plurality of brackets shape the deflection magnetic field in the region about the front rim to provide the geometry correction.

Abstract: A deflection yoke for a cathode ray tube, including a first yoke portion and a second yoke portion engaged with opposite sides of the cathode ray tube neck. Each yoke portion includes a main winding for producing substantial first and associated higher harmonic magnetic fields in the neck and a correction winding for producing substantial third and higher harmonic fields. The correction winding is formed by running normally screen end transverse main winding turns longitudinally with the neck toward the cathode ray tube gun end in one yoke portion quadrant and returning them to the screen end transverse main winding in the other yoke portion quadrant.

Abstract: In an image display apparatus, horizontal-extended line cathodes (22a-22d), an electron beam extraction electrode (23), a control electrode (24), a first focusing electrode (25) having horizontal-elongated apertures (35, 45), a second focusing electrode (26) having vertical-elongated apertures (36, 46), a horizontal deflection electrode (27a, 27b), a vertical deflection electrode (28a, 28b) and a screen (29) are provided in this order toward a travelling direction of electron beam, and each of both deflection electrodes comprises a pair of comb-shaped conductive sheets which are insulatedly interdigitated with each other on the same vertical plane.

Abstract: A static conversion device for a color television picture tube having a base unit, a central unit and a cap unit mounted in a stack about the neck of the picture tube. Each of the units centers a pair of magnetic rings, and the rings are mounted between outwardly extending tabs of adjacent units. The assembly is maintained in position on the neck of the picture tube by a plurality of pairs of fingers extending from the units to abut the neck of the picture tube.

Abstract: A flat thin display device is obtained by means of cold cathodes (10) in which each cathode provides the electron emission (14) for a (part of a) column of pixels. The emissive surface is preferably chosen to be parallel to the front and rear walls (3, 4) of the display device so that the cathodes cannot degrade due to an ion bombardment.

Abstract: A display arrangement consists of a tubular envelope with fluorescent stripes running along its length, localized portions of which are illuminated by different electron guns which produce flood beams of electrons. Field electrodes which surround each electron gun determine the angular direction at which the flood beam leaves the gun and hence which one of the fluorescent stripes is caused to emit light. The stripes can be of three different primary colors, to produce a colored display.

Abstract: A display arrangement consists of a tubular envelope with fluorescent stripes running along its length, localized portions of which are illuminated by different electron guns which produce flood beams of electrons. Each gun is situated within a switchable magnetic field which determines the angular direction at which the flood beam leaves the gun, and hence which one of the fluorescent stripes is caused to emit light. The stripes can be of three different primary colors, to produce a colored display.

Abstract: An improved ion clearing electrode assembly for use in an electron beam production and control assembly which is especially suitable for use in a scanning electron beam computed tomography X-ray scanning system. The assembly uses a vacuum sealed housing chamber which is evacuated of internal gases and in which the electron beam is generated and propagated. Normally residual gas within the chamber interacts with the electrons of the beam to produce positive ions which have the affect of neutralizing the space charge of the electron beam and thereby causing focusing difficulties and destabilization of the beam. The ion collecting electrodes herein are an improvement of those disclosed in the co-pending Rand U.S. patent application Ser. No. 434,252, now U.S. Pat. No. 4,521,900. The electrodes are designed to extract the ions and reduce their neutralizing effect while maintaining a precisely uniform electric field and therefore beam optical aberrations are minimized.

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: On the deflection unit, the two windings as wound on to each toroidal core half, are subdivided into two winding halves which are each wound from the center of the toroidal core half toward the outside.

Abstract: A device for displaying television pictures having a deflection unit which is placed on a display tube and which comprises a line deflection coil system and a field deflection coil system, both with coils of the saddle type. At the gun end the field deflection coil system has two diametrically oppositely located `V` shaped members of a soft magnetic material, the limbs of which extend towards the neck of the display tube while the arcuate transverse portion of each `V` member bridges corresponding parts of adjacent longitudinal winding packets of the field deflection coil at the gun end of the deflection unit.

Abstract: A saturable reactor having a pair of series coils is attached to the outside surface of the cores of the vertical deflecting coils where the series coils are connected in series with a parallel connection of the horizontal deflecting coils. Each of the pair of coils of the saturable reactor is wound around a drum core which is magnetically biased by means of a permanent magnet. The saturable reactor is positioned so that leakage flux from the vertical deflecting coils is led into the drum cores, thereby changing the inductance of the pair of coils in accordance with the degree of vertical deflection. The horizontal deflecting currents flowing through the horizontal deflecting coils thus controlled to chage the width of raster providing a trapezoidal raster which is needed for projecting a TV picture on a large screen.

Abstract: A deflection yoke for a picture tube of a projection color television receiver set has a solenoid-shaped auxiliary coil arranged adjacent to a core of the deflection yoke with a center axis of the auxiliary coil being aligned to a center axis of the deflection yoke. A vertical deflection current or a horizontal deflection current is supplied to the auxiliary coil. An electron beam is deflected by a magnetic field generated by the current of the auxiliary coil so that a raster formed on a face plate of the picture tube is deformed. The raster is deformed to such an extent that it has a correct shape when it is projected on a screen.

Abstract: A flat cathode ray tube comprises in an envelope (10) an electron gun (16) for generating a low energy electron beam (14) which undergoes electrostatic frame deflection by means of a pair of electrodes (22, 24). The electron beam (14) then has its energy increased by means of a double electron lens (30). The double electron lens (30) comprises a first electron lens (32) the image of which forms the object for a second electron lens (36) which provides an electron spot of acceptable size on the screen (12). Thereafter the beam undergoes line deflection in an electrostatic line deflector (40). The line deflector (40) varies the angle of entry of the electron beam into a uniform electric field formed between the screen (12) and a repeller electrode (44) where electron beam follows a parabolic trajectory to the screen (12).

Abstract: The electron beam emanated by a single electron gun falls, after traversing two successive quadrupolar electron lenses, on a beam separator electrode having a pair of vertically spaced apertures formed therethrough for permitting the passage of fractions of the incident beam as two separate beams for dual image display. Subsequently deflected vertically by respective pairs of vertical deflection plates, the two display beams follow their trajectories to a target screen through a focus corrector device, a third quadrupolar electron lens, a pair of horizontal deflection plates, and a dome-shaped scan expansion mesh. Were it not for the focus corrector device, the spots of the display beams on the screen would differ in size according to whether they were deflected upwardly or downwardly by the vertical deflection plate pairs disposed respectively above and below the tube axis.

Abstract: A cathode ray tube includes first and second electrostatic quadrupole lens between the electron gun and the vertical deflection plates to properly focus the electron beam before it enters the vertical deflection plates. A third electrostatic quadrupole lens is located between the vertical deflection plates and the horizontal deflection plates to enhance the angle of deflection as well as to properly focus the electron beam as it moves from the vertical deflection plates into the horizontal deflection plates. A meshless scan expansion lens follows the horizontal deflection plates and is formed of aligned tubular members having interdigitated sections thereby forming a fourth quadrupole lens which accelerates the electron beam and expands it prior to being impinged onto the fluorescent screen.