Abstract: A 3-beam in-line electron gun comprises a pair of tub-shaped lens electrodes, each of which has three in-line apertures in its floor with tubular lips extending from the periphery of the apertures into the tubs. The lips of the lower voltage electrode are longer than the corresponding lips of the higher voltage electrode by an amount designed to either balance out the astigmatism of the fringe focus fields within the tubs or perferably to completely reverse the polarity of the overall astigmatism to at least partially compensate for the astigmatism of a self-converging yoke used with the gun.

Abstract: An electron tube base comprises a cup-like housing and a wafer flange extending radially outwardly from an open end of the housing. The base is mounted over the stem of an electron tube with the stem's exhaust tubulation disposed in the housing in a close fit and the stem's lead-in conductors extending through apertures in the flange. The flange has a dielectric-receiving recess around one of the conductors and the internal surface of the housing wall has a pair of open longitudinal channels along which the dielectric material can be force-flowed into the recess from the opposite end of the housing.

Abstract: A cathode ray tube comprises an envelope having a funnel portion with an electrical terminal extending through a wall surface thereof. A faceplate is sealed to the funnel portion and a screen contact assembly provides electrical contact between the electrical terminal and an aluminum coating on an inside surface of the faceplate. The screen contact assembly includes a conductive strip attached at one end to the electrical terminal. At the other end of the strip and attached thereto is a relatively flexible first contact member which is in pressured electrical contact with the aluminum layer on the faceplate. Disposed between the flexible first contact member and the aluminum layer on the faceplate is an oxidized, silver plated NICHROME foil member of high electrical conductivity. Transverse support and lateral stability is provided by a relatively flexible second contact member attached to and forming a part of the screen contact assembly.

Abstract: A CRT comprising an evacuated envelope having an electrically-insulating neck and a beaded electron-gun mount assembly housed in the neck. The beads of the assembly are closely spaced from the inner surface of the neck. An electrically-conducting band is located against the surface, each bead opposite the neck. The band is electrically connected to and supported from one of the electrodes of the mount assembly.

Abstract: In a method for flashing the getter in a succession of cathode-ray tubes of different sizes and/or shapes, where the getter container is adjacent the inner surface of the tube envelope, the step of permanently fixing the getter container of each tube of the succession in such position that the container centerline intersects the outer surface of the envelope at substantially the same distance from the longitudinal axis as each of the other tubes of the succession.

Abstract: A workpiece having a machine-readable coded marking recessed into the surface thereof. The workpiece comprises a main body and a thin integral coating in the area of the marking. The marking comprises a plurality of related marks, such as a bar-code marking, which are recessed through the coating and which have substantially different light reflectances than the surrounding surface. The workpiece may include an integral undercoating between the coating and the main body with marks recessed into, but not through, the undercoating. The marks may be made by selectively removing material, as by abrasion or ablation, from defined surface areas and through the coating.

Abstract: A method for producing a machine-readable coded marking in the surface of a workpiece comprising vaporizing sequentially the surface portions of selected ones of a series of contiguous areas of unit widths of the surface.

Abstract: A method for preparing a phosphor including heating at its reaction temperature in a covered container a mixture of zinc sulfide, an activator quantity of copper as a compound thereof, an activator quantity of aluminum as a compound thereof, an activator quantity of gold as a compound thereof, a minor proportion of elemental selenium, a minor proportion of elemental sulfur and a minor proportion of carbon. The reaction mixture is heated in the container and the product is then cooled. After cooling, whatever carbon remains is removed as by screening.

Abstract: CPT comprises a deflection-and-focus color-selection masking structure, a screen of parallel phosphor stripes, and means for producing three convergent in-line electron beams directed towards the target. When the CPT is operated, pairs of beamlets transmitted through windows in adjacent apertures in the masking structure are deflected towards one another to excite the same phosphor stripe and, also, are focused (compressed) in the narrow width direction of the phosphor stripes and defocused (stretched) in the length direction of the phosphor stripes.

Abstract: A CRT comprises a deflection-and-focus color-selection masking structure, a screen of parallel phosphor stripes, and means for producing three convergent in-line electron beams directed towards the target. The masking structure comprises a metal masking plate having two major surfaces and having therein an array of apertures arranged in columns that are substantially parallel to the phosphor stripes. Arrays of narrow conductors are insulatingly supported in opposed positions on each major surface of said plate. The conductors extend substantially parallel to the stripes and are located in every other space between the columns.

Abstract: Method of testing a completed cathode-ray tube comprises applying a higher-than-operating voltage between the metal structure around the sidewall of the panel of the tube and the internal conductive coating on the funnel of the tube whereby the panel-to-funnel sealing layer is punctured if it does not have sufficient electrical-breakdown strength.

Abstract: Method for vaporizing getter material from a container inside a vacuum electron tube comprises (a) sensing the location of the container from outside the tube, (b) generating signals indicating that location, (c) positioning an induction heating coil outside the tube opposite the container, (d) energizing the positioned heating coil and (e) using the generated signals to control the energizing step.

Abstract: A CRT comprising an evacuated envelope having an electrically-insulating neck and a beaded electron-gun mount assembly in the neck. The beads of the assembly are closely spaced from the inner surface of the neck. At least a portion of the surfaces of the beads opposite the neck is electrically conducting.

Abstract: In the novel method, the widths of the parallel luminescent stripes of a luminescent viewing screen are scanned by a beam of ultraviolet light whereby the stripes are excited to emit light along the path of scan. The emissions of the light in an identifying spectral band are sensed with respect to the position of the light beam on the screen and converted to a train of electrical signals. Then, the average width of the stripes identified by the spectral band is calculated from the distance over which the intensities of the signals are continuously above an assigned value.

Abstract: A method for coating a selected portion of the internal surface of the neck of a CRT having a beaded electron-gun mount assembly housed therein. The method comprises providing in the neck at least one source of chromium metal spaced from and within line-of-sight of at least a portion of the neck surface opposite each bead. The CRT is evacuated to a low gas pressure and then chromium metal vapor is released from each source towards the neck surface, whereby chromium metal deposits on the neck surface.

Abstract: A layer of an aqueous solution containing polyvinyl alcohol and a zirconyl compound is applied to a clean glass surface and dried to produce a precoating thereon. A subsequently-applied phosphor-photobinder coating thereon is exposed to a light image and then developed with a turbulent aqueous liquid. The phosphor-photobinder coating exhibits improved adherence to the surface during the developing step due to the presence of the precoating.

Abstract: A precision cathode current regulator for controlling cathode current in a cathode-ray tube having a field effect transistor which is stabilized by an operational amplifier connected in a feedback mode. A second operational amplifier is electrically coupled to the field effect transistor for measuring cathode voltage accurately without affecting the regulated current.

Abstract: A tube of the shadow mask type having a line screen and a slit aperture mask wherein the slits are arranged in columns and the slits in each column are separated by web portions of the mask is improved by the addition to the screen of light absorbing material in patches located only in alignment with the webs.

Abstract: The analog video signal for a modular flat panel display device is digitized in an analog to digital converter. The digitized data are supplied to a left/right serial shift register. A left/right control signal causes the left/right shift register to periodically receive data on either a left input terminal during a left loading mode or a right input terminal during a right loading mode. In each loading mode a portion of the data are output from the serial register over a right output terminal and the other portion over a left output terminal. Accordingly, during each loading mode one portion of the data is output in the same order as received and the other portion in an order reversed from the received order. The data from the left/right register are supplied to primary registers and because of the operation of the left/right register data for adjacent primary registers are in opposite order.

Abstract: Additions of fluorescein or a fluorescein salt and a diol to a photosensitized polymeric material increase the photosensitivity thereof in a method for photodepositing a luminescent-screen structure for a cathode-ray tube.