Abstract: A deflection yoke of the self-converging type uses pincushion-shaped horizontal deflection fields and barrel-shaped vertical deflection fields for converging three in-line electron beams and includes a first pair of magnets disposed near the top and bottom of the beam exit end of the yoke. Each magnet is poled to produce a field having the same polarity as the vertical deflection field during the interval in which the electron beam is deflected towards the magnet. A second pair of magnets is disposed at the top and bottom of the inside of the flared inner surface of the yoke at a generally central position between the beam entrance and beam exit ends of the yoke, each of which is poled for producing a field of a polarity opposite to that of the vertical deflection field when deflecting the beam towards the respective magnet. The first and second magnet pairs coact to correct North-South pincushion distortion without substantial effect on the convergence.

Abstract: Vertical translation of a self-converging deflection yoke relative to an in-line TV kinescope may be necessary to achieve satisfactory raster distortion. The vertical translation of the yoke may cause a residual convergence error. The residual convergence error may be eliminated by means of first and second permeable tabs mounted on the yoke and arranged for simultaneous vertical adjustment.

Abstract: Disclosed is an in-line type color picture tube apparatus which comprises an in-line type color picture tube including a phosphor screen for displaying a substantially rectangular picture with horizontal, vertical, and diagonal axes and an in-line electron gun arranged in parallel with the horizontal axis so as to be allowed to cast electron beams on the phosphor screen to reproduce a color image, a deflection yoke disposed around the outer periphery of the tube and generating such a magnetic field that may give positive isotropic astigmatism to the electron beams when the electron beams are deflected along the horizontal axis, may give negative isotropic astigmatism to the electron beams when the electron beams are deflected along the vertical axis, and may give negative anisotropic astigmatism to the electron beams when the electron beams are deflected along the diagonal axes, and a correction deflection element formed of a plurality of permanent magnets arranged in the vicinity of the end portion of the de

Abstract: An electromagnetic lateral convergence assembly includes a generally-annular, planar magnetic core (optionally found as a laminate) having integral pole pieces extending toward the center of the annulus. Electrical coils are mounted on selected pole pieces for producing a convergence-compensating magnetic field within the center of the annulus. The coils are secured to a printed circuit board to hold the core in spaced parallel relationship to the board. Optionally a purity assembly including a planar magnetic core having a number of electrical coils for producing a rotatable, variable, linear field is mounted on the other side of the printed circuit board.

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: A beam-index tube apparatus comprising a beam-index picture tube provided with an electron gun to generate an electron beam of an oval cross-section, a deflecting device having a deflecting yoke for deflecting the electron beam, and correcting elements provided in the proximity of a front end of the deflecting yoke and positioned corresponding to the horizontal axis and the diagonal axes of the picture tube. The correcting elements act upon the electron beam in a manner such that the rotating of the diagonally deflected electron beam and widening of the horizontally deflected electron beam are thereby corrected.

Abstract: An improved magnetic lens having a long focal length for the optical imaging of a specimen having a large surface area by means of a charged-particle beam. The lens includes a cylindrical coil including at least one winding which is surrounded by a field-carrying metallic shell member fabricated of magnetic material disposed at the radially outer surface of winding.

Abstract: A color misalignment correction device for use in a color picture tube, in which at least two magnets are disposed rotatably and adjustably on the outer peripheral surface of the cathode-ray bulb so as to correct an arc-shaped convergence error appearing in a horizontal direction of the phosphor screen due to a mounting error of the electron guns in the color picture tube or due to a mounting error of the deflection coil assembly on the color picture tube.

Abstract: A deflection yoke of the self-converging type utilizing pincushion-shaped horizontal and barrel-shaped vertical deflection fields for converging three in-line electron beams includes magnets disposed near the top and bottom beam exit end of the yoke and respectively poled to produce flux of the same polarity as the vertical deflection field at the top and bottom portions of the raster. A second pair of magnets disposed inside the flared inner surface of the yoke at the top and bottom approximately at the center of the yoke length are respectively poled for producing flux which is of the opposite polarity of the vertical deflection field at the top and bottom portions of the raster, the two pairs of magnets cooperating with the deflection field for correcting North-South pincushion distortion with substantially no effect on the beam convergence.

Abstract: The deflection-coil holder for holding in position the toroidal core together with the deflection coils is mounted and adjusted with the aid of straddling dowels floatingly retained in the deflection-coil holder and engaging into sleeve carriers arranged on a mounting member which is secured to the cathode-ray tube envelope.

Abstract: A static convergence device for statically converging first and second electron beams within an envelope of a cathode ray tube comprises an adjustable first magnetic apparatus, adjustment of which moves at least one of the electron beams in a direction and with a magnitude of motion to converge them to within a first distance of each other for selected conditions of misconvergence. The apparatus produces a motion of minimum magnitude of at least one of the electron beams for all adjustments of its magnetic field. The apparatus is unable to converge the electron beams to within the first distance for all of the various conditions of misconvergence.

Abstract: A convergence apparatus having a pair of four-pole static magnets and a pair of six-pole static magnets mounted rotatably at the neck portion of an in-line color CRT having three electron guns arranged laterally in a single file such that the pair of four-pole static magnets and a pair of six-pole static magnets are arranged in the axial direction of the neck portion. The magnetization density of the N poles and that of the S poles of at least one of the pairs of four-pole magnets and six-pole magnets are made to be different, and further the magnetization density of the two sheets of the static convergence magnets of which the magnetization density of the N poles and that of the S poles are different are made to be different, and thereby more certain and complete correction can be attained.

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.

Abstract: An in-line CRT features a static convergence means. It has at most two permanent magnets in or around the tube neck before the deflection coils.

Abstract: Apparatus for moving in any direction a first outer beam of three in-line electron beams within the envelope of a cathode ray tube. A magnetic field producing arrangement is rotationally adjustable about the neck of a cathode ray tube and has an interior zero magnetic field point located between the central and second outer beams. The arrangement effects movement of the first outer beam in any direction with substantially no movement of the two other beams. To converge both of the outer beams onto the central beam, a second magnetic field producing arrangement is provided.

Abstract: A first magnetic field producing member has its poles oriented for producing an initial predetermined movement of the two outside ones of three in-line beams of a cathode ray tube. Second and third field producing members are adjustable for producing variable strength and direction of magnetic fields for moving the two outside beams in opposite and the same directions, respectively, for converging the three beams.

Abstract: Each convergence device is particularly adapted for converging the three electron beams of an in-line picture tube. Each convergence device comprises a mounting sleeve having an axial opening for receiving the neck of the picture tube, and a plurality of beam adjusting assemblies mounted around the supporting sleeve. Each beam adjusting assembly may comprise a rotatable supporting ring, a pair of rotatable magnet rings stacked upon the mounting ring, the magnet rings having integral bevel gears facing toward each other, a radial shaft having a bevel pinion meshing with such gears, and a member on the supporting ring and rotatably supporting the shaft. Each magnet ring is formed with permanent magnetic poles. The orientation of the poles can be varied by rotating the entire beam adjusting assembly about the axis of the picture tube. The effective strength of the poles can be adjusted by rotating the shaft, which causes rotation of the magnet rings in opposite directions.

Abstract: A deflection coil unit for color television display tubes in which the narrow end of a flared deflection yoke is mounted in a ball joint, adjusting means being provided at the widest end of the yoke for tilting the deflection yoke about a horizontal and a vertical axis through the ball joint. Thus, the convergence on the vertical and horizontal axis of the display screen can be adjusted. For the adjustment of the color purity, the ball joint is mounted such that it is axially displaceable in a housing.

Abstract: Each disclosed convergence device is particularly adapted for converging the three electron beams of an in-line picture tube. Each convergence device comprises a mounting sleeve having an axial opening for receiving the neck of the picture tube, and a plurality of beam adjusting assemblies mounted around the supporting sleeve. Each beam adjusting assembly may comprise a rotatable supporting ring, a pair of rotatable magnet rings stacked upon the mounting ring, the magnet rings having integral bevel gears facing toward each other, a radial shaft having a bevel pinion meshing with such gears, and a member on the supporting ring and rotatably supporting the shaft. Each magnet ring is formed with permanent magnetic poles. The orientation of the poles can be varied by rotating the entire beam adjusting assembly about the axis of the picture tube. The effective strength of the poles can be adjusted by rotating the shaft, which causes rotation of the magnet rings in opposite directions.

Abstract: Two six-pole annular magnetic structures are arranged about the neck of a three-in-line color display tube so as to be eccentric with respect to each other and with respect to the center of the neck. The center of one six-pole is situated halfway between the central electron beam and one outer electron beam. The two beams on both sides of the center of the six-pole, consequently, are subjected to equal forces of the same direction. The third beam is subjected to a force in the same direction, but this force is nine times larger due to the three times as large distance from the center of the six-pole and due to the square-law field variation thereof. Because of their identical direction and value, the forces acting on the former beams will not disturb the convergence therebetween.

Abstract: An image pickup device includes an image pickup tube, a coil assembly disposed around the image pickup tube, and elastic members disposed on the inner circumferential surface of the coil assembly in the proximity of an extremity at the side of a face plate of the image pickup tube and an extremity at the side of the stem thereof for coaxially fixing the image pickup tube and coil assembly, said elastic members comprising a commercially available O ring of elastic material.

Abstract: A deflection device for use in a color television receiver comprises a deflection yoke fitted to a neck portion of the color television receiver having three horizontally arranged electron guns so designed as to emit three electron beams, for deflecting horizontally and vertically said three electron beams emitted onto a fluorescent screen from the electron guns of the color television receiver, and soft magnetic material pieces fitted to an end portion of the deflection yoke nearer to the screen, for locally varying the distribution of a deflection field generated by the yoke so as to correct mis-convergence of said three electron beams occurring at the peripheral portion of the screen.

Abstract: A nonmagnetic supporting member is adapted to surround a picture tube neck portion and includes a first collar having a plurality of circumferentially spaced cam-receiving apertures and a captivating collar spaced from the first collar, the supporting member including a clamp arrangement for fixedly mounting the member to the tube neck. A plurality of rotatable magnetized rings are mounted adjacent to the captivating collar and a rotatable second collar is mounted between the magnetized rings and the first collar. The second collar includes a plurality of ramp portions which, when rotated by tabs located on the first and second collars to locate the ramps within the apertures, unlocks the magnetized rings to enable adjustment. A second set of tabs formed on the first and second collars permit rotation of the ramp portions out of the apertures which increases the pressure on the magnetized rings between the captivating and first collars for effectively locking the rings in position.

Abstract: An improved CRT beam adjustment device is provided for exterior orientation on the neck of the tube. The device includes a plurality of rotatably adjustable annulate magnetic members sequentially positioned on a support sleeve, one end thereof being formed to have a plurality of tongue-like extensions, each having a terminal protuberance extending radially outward therefrom. Each protuberance has a surface facing the annulate member that is downward sloping toward the body of the sleeve. An adjustable ring clamp is positioned to ride on the slanted surface of the protuberance and abut the adjacent magnetic members, thereby providing by one adjustment, pressure to positionally lock the adjusted members while simultaneously affixing the device to the neck of the tube.

Abstract: This disclosure depicts a novel yoke adjusting apparatus for tilting a yoke relative to a central axis of a color television picture tube having a funnel with a flared portion and a neck containing an inline electron gun assembly. The yoke adjusting apparatus is illustrated as comprising; a circumferential support about the neck of the funnel and attached to the flared portion, a tilt adjusting means carried by the circumferential support for selectably positioning the yoke, a locking means for locking the tilt adjusting means in any selected position, and a manually operable means for releasing the locking means to free the tilt adjusting means and thereby enable it to be retracted and the yoke readjusted. The apparatus provides for simplicity and economy in readjusting the yoke at a later point in time after the initial adjustment.

Abstract: An image pickup tube coil assembly is provided on the outer surface thereof with a longitudinal groove and a lateral groove. A holder for holding the assembly is fixed to an optical system which forms an image focused on the face of the image pickup tube in the tube coil assembly. The holder is provided with two eccentric pins one of which is engaged with the longitudinal groove for rotating the assembly to effect registration of the image and the other of which is engaged with the lateral groove for longitudinally move the assembly back and forth to effect focus adjustment.

Abstract: Apparatus is provided for performing the purity adjustment in slotted mask color picture tubes of the type having in-line electron guns located in side-by-side relationship along a single plane. The apparatus includes first and second bar magnets located externally of the tube and parallel to the gun-containing plane. Each of the bar magnets is oriented to generate a magnetic field in substantially the same plane, that plane being perpendicular to the gun-containing plane. Means are provided for jointly moving the bar magnets between a first position wherein the net resultant field generated across the gun containing plane is zero, and second position wherein the net resultant field generated by the bar magnets across the gun-containing plane is greater than zero and has a substantially equal effect on each of the guns. In a first embodiment, the moving means comprises a support upon which each of the bar magnets is fixedly mounted.

Abstract: The convergence coil assembly comprises a frame plate with guides at an angle of 120.degree. to receive three coil housings which are slidable radially to compensate for variations in the diameter of the tube neck. At their inner ends the housings have flanges receiving a resilient clamp ring to draw them against the tube neck. The clamp ring may be hooked to provide different degrees of tension. Indicators provide visual alignment of the magnets with a desired part of the gun. A permanent magnet on the outer end of the core of the electromagnets is rotatable for adjustment, and there are means to hold the adjustment.