Abstract: To coat the inner surface of the viewing window of a faceplate panel for a cathode-ray tube, of the type having a peripheral sidewall or flange around the window, dispense onto the surface a quantity of slurry in excess of what is required for the desired coating, spread the dispersed slurry over the surface, wet the uncoated inner surface of the sidewall with an aqueous medium, pass the excess portion of the slurry over the wet sidewall surface for removal from the panel, and then remove particulate material from the inner sidewall surface.

Abstract: The electron gun includes a pair of electrodes between which a resistive lens structure comprising a stack of alternate apertured plates and resistive blocks is disposed. The stack comprises a first section which has two resistive blocks between each adjacent pair of electrode plates and a second section which has one resistive block between each adjacent pair of electrode plates. The lens is thereby adapted to operate with a potential profile which comprises a compound linear slope in a 1:2 ratio.

Abstract: The electron gun includes a pair of electrodes between which a resistive lens structure comprising a stack of alternate apertured plates and resistive blocks is disposed. A first portion of the resistive stack is electrically paralleled with another stack of resistive blocks whereby bleeder current through the resistive lens structure results in a compound linear potential profile. The other stack of resistive blocks may comprise a second stack in the same lens structure interleaved with the apertured plates of the lens structure or it may constitute together with a different set of aperture plates a second resistive lens structure between a different pair of electrodes of the gun.

Abstract: An evacuated envelope includes substantially parallel front and back walls with a cathodoluminescent screen on the front wall. Within the envelope, in spaced relation to the back wall and substantially parallel to the screen, it is an electron beam guide comprising a pair of spaced apart, elongated guide grids having a plurality of apertures therethrough. At one end of the beam guide is an electron beam generating and directing means which directs at least one beam of electrons between the guide grids. A shielding member is disposed between the screen and the beam guide adjacent to the electron beam generating means.

Abstract: A system for controlling the emission of a device having a sense electrode for sensing a measure of an emission species from a source within the device. The sensed measure of the emission species is converted to a control signal. The output of the source is modified in response to the control signal by varying the time during which the source emits the emission species.

Abstract: The gun, for use in a television picture tube, comprises a cathode, an apertured control grid, and an apertured screen grid aligned in the order named. The screen grid aperture comprises a rectangular slot portion facing the control grid and a circular portion facing away from the control grid. The slot portion of the aperture, which has a width 2-5 times its depth, creates an astigmatic field that produces underconvergence of the electron beam in the vertical plane only, whereby to avoid and/or compensate for vertical flare distortion of the beam spot at off-center positions on the image screen.

Abstract: A method for preparing a screen structure for a cathode-ray tube comprising(a) exposing a water-soluble photopolymeric film on a surface to a light image to insolubilize selected portions of the film,(b) flushing the exposed film with an aqueous medium that is free from borate ions to remove only the still-soluble portions of the film, thereby producing a stencil on the surface,(c) rinsing the stencil with an aqueous solution containing borate ions to prevent further removal of material from said stencil,(d) then overcoating the stencil and the surface not covered by the stencil with pigment particles,(e) and then removing only the stencil and the overcoating thereon.

Abstract: In a cathode-ray tube wherein the electrical connection between a conductive metal body attached to and having a surface contiguous with a surface of the envelope and a conductive layer on that surface is assured by a conductive stripe contacting the body and the layer, the stripe consists essentially of a minor proportion of glass and a major proportion of at least one metal selected from the group consisting of tin, lead and indium.

Abstract: Method comprises applying to a surface to be etched a coating of a liquid composition having a pH of about 5.8 to 7.0 and comprising an alkali caseinate, an alkali dichromate photosensitizer, sodium borate and water. The layer is dried, photoexposed, developed and baked to produce an etch-resistant stencil.

Abstract: In a display device having an evacuated envelope, an electron beam guide and an electron generating means for generating beams of electrons, a modulator structure on which is disposed a plurality of control electrodes may be formed by interconnecting selected ones of the control electrodes which operate at a common potential. This interconnected electrode structure decreases the number of control electrodes which extend from the evacuated envelope. The electron generating means is shielded from the interconnected electrode structure to prevent perturbation of the generated electron beams.

Abstract: After an electron tube is exhausted and sealed, a base is pushed into position on the stem of the tube, the space between the stem and the base, at least around one pin of the tube, is filled with a sealing substance, and then the stem is heated until the sealing substance is at least partially cured by heat from the stem to form a dielectric material.

Abstract: An evacuated envelope includes spaced substantially parallel front and back walls, and a plurality of spaced, parallel support walls between the front and back walls and forming a plurality of channels. An electron gun structure at one end of the channels directs at least one beam of electrons into each channel. In each channel is a focusing guide comprising at least two substantially parallel guide grids which confine the electrons into a beam. At the end of the focusing guide opposite the gun structure is a beam collector structure which collects the beam and subsequently generates a signal which is processed and used to adjust the uniformity characteristics of each beam.

Abstract: An image display device includes a flat evacuated envelope which has a front and a back wall. On the inner surface of the front wall is a phosphor screen for displaying the image. A first set of electron beam guides is between the back wall and the screen. A second set of electron beam guides is at one end of the first set of beam guides. A source of electrons is postioned to inject an electron beam into the second set of guides. A deflection means is provided to direct the electron beam from the second set of guides into the first set of guides.

Abstract: A method for spot-knocking a CRT comprising interconnecting the lower-voltage gun elements including the heater, the cathode, the control electrode and the screen electrode, and applying spot-knocking voltages between the anode and the interconnected gun elements with the focus electrode floating electrically; that is, unconnected.

Abstract: In a method of making a virgin CRT (cathode-ray tube), soon after the panel and funnel are sealed together to form a bulb, the inside of the bulb is flushed with wet carbon-dioxide gas and then flushed with dry noncontaminating gas. Subsequently, the mount assembly is sealed into the funnel, and then the bulb is exhausted, sealed and gettered to produce the finished CRT.

Abstract: In a method for making an indirectly-heated cathode assembly, the steps of spacing the heater from the cathode substrate with a temporary volatilizable spacer, fixing the positions of the heater and cathode with respect to one another with the spacer therebetween, and then volatilizing the spacer.

Abstract: Method comprises (1) introducing a polarized light beam into the convex surface of an optically-transparent body whereby the beam propagates in the body in a guided manner near the surface, (2) extracting at least a portion of the beam from the body through the surface at a distance from where the beam was introduced, (3) sensing the change in polarization state of the extracted portion of the beam occurring during its propagation in the body, and (4) calculating the value of stress from the sensed change in polarization state.

Abstract: A fixture for supporting and aligning the faceplate and funnel of a CRT while they are being sealed together includes a plurality of alignment structures, at least one of which comprises rotatable rollers on a shaft oriented so that peripheral surface portions of the rollers provide prescribed surfaces for the faceplate and the funnel to bear against to align them.

Abstract: In a display device a modulator structure may be formed by disposing on a surface of the back wall a plurality of first control electrodes. A modulator member having a smoothly continuous surface has disposed thereon a plurality of second control electrodes. The surfaces of the back wall and the top member having the electrodes thereon are joined together to form opposing pairs of control electrodes.

Abstract: An ion feedback electron multiplier has an envelope containing an ionizable gas. Within the envelope is a chain of multiplier dynodes divided into two planar groups spaced from and parallel to one another. At one end of the multiplier chain is an electron source capable of emitting electrons upon ion bombardment. An electron lens which is between the multiplier chain and the electron source, focuses the electrons from the source onto one of the dynodes of the multiplier.