US3598628A - Cathode ray tubes with target screens and the manufacture thereof - Google Patents

Cathode ray tubes with target screens and the manufacture thereof Download PDF

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US3598628A
US3598628A US772639A US3598628DA US3598628A US 3598628 A US3598628 A US 3598628A US 772639 A US772639 A US 772639A US 3598628D A US3598628D A US 3598628DA US 3598628 A US3598628 A US 3598628A
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index
screen
faceplate
strips
color
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David M Goodman
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/182—Luminescent screens acting upon the lighting-up of the luminescent material other than by the composition of the luminescent material, e.g. by infra red or UV radiation, heating or electric fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/187—Luminescent screens screens with more than one luminescent material (as mixtures for the treatment of the screens)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/24—Supports for luminescent material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/34—Luminescent screens provided with permanent marks or references
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses

Definitions

  • Target screens for beam-index cathode ray tubes and beam-index color kinescopes are described with ribs, filaments, or projections which support or align the beamindex elements with the remainder of the screen structure.
  • An elongated scintillator-derived light source is positioned parallel to strip-like elements of the target screen to reduce exposure time when the photo-resist, or other photographic, method of screen fabrication is used.
  • Means to further simplify the construction of target screens for color kinescopes are described which use printing techniques (brush, flame-spray, electrostatic spray, etc.) to deposit the different color producing phosphors on the faceplate in register with the index strips.
  • This invention relates to target screens used with beamindex cathode ray tubes.
  • it relates to target screens used with beam-index color cathode ray tubes (color kinescopes) and improved methods of manufacture thereof.
  • the beam-index tube In addition to the savings on the cost of these parts, there is also advantage derived from the beam-index tube in that it eliminates the need for precise alignment of the three electron beams with the thousands of holes in the aperture mask. Furthermore, these holes must be aligned with the thousands of trios of phosphor dots on the target screen which requires that the shadow-mask assembly be married to its faceplate which introduces another complicating factor in the production of tubes of this type. Additionally, the beam-index tube generally is considered capable of eliminating the costly convergence circuits and assemblies, and the de-gaussing coil and circuits, now considered standard requirements in color television receivers.
  • the beam-index tube also promises to make possible many improvements in packaging and styling. This includes the construction of very small personal size television receivers; the construction of wide angle deflection systems; kinescopes with shorter neck length; and the construction of lighter-weight glass envelopes, with greater use of its faceplate area for image display.
  • These target screens contain strips of red, green, and blue color-emitting phosphors in register with indexsignal generating strips.
  • the index signals may be in the optical or in the X-ray region of the spectrum. More than one type of index signal may be used.
  • the index-generating elements may be admixed with the color producing phosphors.
  • index signal producing phosphors are described as being in the faceplate of the tube.
  • the brightness of an image produced on any television screen is greatly enhanced when the screen is metallized, i.e., when it is provided on its rear surface with a specular metal layer.
  • Metallized phosphorscreens of the above-described sensing varieties have certain disadvantages. These disadvantages result primarily from the fact that, although the usual specular metal layer is transparent to electrons, it is nevertheless substantially opaque not only to (a) the invisible rays emitted by the signal-generating material, but also to (b) the visible or invisible actinic rays employed in the con- Wentional photographic method of laying-down the line like mosaic pattern or patterns of which the screen is comprised.
  • a conventional electrontransparent specular metal layer is opaque to the invisible (e.g., ultra-violet) control or reference signals
  • the photocell or other pick-up device for the control signals must be mounted in front of the screen-plate.
  • This front mounting is undesirable because the reference signals may be contaminated by ambient rays before they reach the pick-up device.
  • the very presence of the pick-up device in front of the kinescope limits the angle from which the screen may be viewed.
  • Saulnier proposes to overcome some of the difiiculties previously experienced by providing the target surface of a phosphor screen with a partially transparent specular metal layer.
  • a process for doing this requiring several additional steps in the manufacturing process is the subject of his invention.
  • the purpose of this invention is to reduce the cost in manufacture of line-screen beam index cathode ray tubes in general and beam-index color kinescopes in particular.
  • the invention resides in new beamindex target screen structures and methods of construction thereof.
  • the target screen is provided on its inside surface with ribs, projections, or other indicia which are used as fiducial markers to simplify the registration of the color producing strips with the index signal producing strips.
  • ribs or indicia may be molded with the faceplate of the tube or they may be supported on the faceplate at a later stage in manufacture.
  • an elongated or ribbon light source derived from a transparent sheet of scintillator material, is used in a lighthouse to increase the speed of production when photoresist methods are used to deposit the phosphor strips.
  • the sheet of scintillator is excited over a large surface to improve its capture area, thereby permitting large sources of ultraviolet excitation to be used.
  • this same type of scintillator sheet can be used to replace the point source of light conventionally used in prior art methods of screen construction by the photo method.
  • This invention also teaches the use of servo-controlled printing tech niques for laying down the line screen wherein the ribs, projections, or other indicia of the target screen are employed to guide the brushes or jets used in the screen printing process.
  • FIG. 1 depicts a cathode ray tube in a cabinet with an index signal detector feeding optical index signals into a chassis located beneath the tube.
  • FIG. 2 is a front view, enlarged, of the target screen on the inside of the faceplate of the tube of FIG. 1.
  • FIG. 3 is a cross-section of a typical target screen and faceplate.
  • FIG. 4 also is a cross-section of the target screen and faceplate, with an aluminum layer on the back of the phosphor strips.
  • FIG. 5 illustrates a roller for scraping (or coating) the rearwardly facing edge of index signal supporting ribs or filaments.
  • FIG. 6 illustrates a conventional light source, and alternatively a novel elongated scintillator light source, positioned on the outside of the faceplate for activating or polymerizing selected photosensitive mixtures or layers in the process of target screen construction.
  • FIG. 6A illustrates, in cross section, a rib or projection on the inside of the target screen which is molded integrally with the faceplate.
  • FIG. 7 illustrates a method of painting the phosphor strips directly on the faceplate.
  • a plurality of brushes for producing one color triad and one index strip are shown guided by ribs or projections on the faceplate.
  • FIG. 8 is akin to FIG. 7 except that the guide pins for the phosphor brushes are positioned against both the ribs and the faceplate of the tube.
  • an optical or electrical indicia sensing servo-control system is depicted for guiding the phosphor brushes or jets.
  • FIG. 9 illustrates the scintillator light source of FIG. 6 with its exit region at the focal point of a lens system. Also shown is a hollow funnel scintillator for providing a point light source.
  • FIG. 1 a beam-index cathode ray tube (CRT) is shown with a faceplate 11 having a target screen 10.
  • the faceplate has an implosion panel 8 bonded thereto by a thin resin layer 9.
  • One form that the target screen 10 may take is shown in FIG. 2, greatly enlarged, and is comprised of an array of index signal generating elements disposed in register with an array of different color producing phosphors 12B (blue), 14R (red), and 16G (green).
  • the electron beam from gun 7 of the CRT scans the phosphor strips at right angles in order to develop a color image suitable for viewing.
  • the signals generated by the index strips are detected in the scintillator 6 thereby generating optical index signals which are converted into electrical signals by photodetector 5.
  • a plurality of windows 2 are provided for scintillator 6 in the opaque electrically conductive aquadag coating ordinarily deposited on the inside of the CRT funnel section. This coating (which alternatively may be of aluminum) is used to establish a uniform electric field inside the tube.
  • the CRT is housed in a cabinet 4 containing a chassis 3 which houses the photodetector 5.
  • the index signals, and the optical index signals derived therefrom generally are used to indicate the position of 6 the electron beam on the target screen. For color television receivers these index signals are used to control the sequential excitation of the different color producing phosphor strips.
  • FIG. 3 is an enlarged view of section 3-3 taken through the target screen of FIG. 2.
  • Glass faceplate or substrate 11 has deposited on its inside surface the blue, red, and green color producing strips 12B, 14R, and 16G separated by ribs or projections 18. Associated with these ribs are the index signal generating elements. Projections 18 may also be strands of a mesh-like structure as disclosed in applicants co-pending applications Ser. 85,353 and Ser. 345,197, supral
  • the resin layer 9 and implosion panel 8 of FIG. 1 are also illustrated in FIG. 3.
  • rib 18 is optically and mechanically continuous with faceplate 11. This is illustrated at 17. It is preferred in this case that the ribs 18 be molded at the same time that the front panel is pressed.
  • index signal generating element 21 is shown supported on rib 18.
  • element 21 is the phosphor designated P-16 which emits radiation in the ultraviolet peaking at about 1800 angstroms.
  • rib 18 may be secured to the faceplate after it is pressed as shown at 19.
  • the rib 18 may be comprised of material selected from one of the electron-sensitive scintillating glasses. Hence, no additional element akin to 21 is shown at 19. If the scintillator rib is opaque or absorptive of its own radiation, then detection of the index signal best takes place rearwardly of the screen as by scintillator 6 of FIG. 1.
  • the index signals may be light piped to an edge of the target screen as set forth in applicants Ser. 485,017.
  • the ribs 18 are in register with the color producing phosphor strips and physically separate the strips into triads.
  • the ratio of color strips to index strips can be varied from the 3:1 relationship illustrated and more than one index signal generating material can be used.
  • FIG. 4 a target screen akin to that in FIG. 3 is.
  • An electron transparent, electrically conductive, light reflective aluminum layer 22 is disposed on top of the color producing phosphors 12B, 14R, and 166 to increase the brightness when high voltages are used on the target screen.
  • the aluminum layer may extend over the rib as depicted at 25.
  • the optical index signals are transmitted transversely of the faceplate 11 through rib 18 to a suitable exit terminal.
  • layer 22 may also cover the rib 18 as depicted at 24. In this case, to radiate index signals rearwardly index signal generating element 23 is deposited on top of layer 24.
  • Rib 27 does not physically separate the color producing phosphor strips into triads as do ribs 18 but is supported by one of the strips. Also, rib 27 straddles a pair of color producing strips; and may be disposed rearwardly of the aluminum layer 22.
  • FIGS. 58 illustrate different methods of constructing the target screens of FIGS. 3 and 4.
  • FIG. 5 an array of three different color producing phosphor strips is shown on the faceplate 11.
  • the phosphors can be mixed with photo-sensitive carriers to form a slurry or, alternatively, the phosphors can be dusted on or otherwise applied after a photo-sensitive layer is deposited and exposed. Exposure of the photo-sensitive material can be through the faceplate 11, or from the inside thereof. Three successive series of steps are involved, one series for each color. The layer must be applied, exposed with careful registration of an optical master, and then developed to remove the unhardened material.
  • the faceplate is rotated and tilted to apply the photo-sensitive layer.
  • This rotating motion should be changed to a reciprocating motion so that the ribs 18 do not interfere with the smooth application of the photo-sensitive layer. If the ribs are applied after the color phosphors are deposited the slurry can be rotated and tilted.
  • the next step is to lay down the index material, akin to 21 of FIG. 3 or 23 of FIG. 4. In a three layered screen this can be a difiicult and tedious task as attested to by Saulnier and by applicants own experience. Also, in a conventional three layered screen the index strip is deposited last so that any imperfection in this step is very expensive.
  • FIG. 6 a photographic technique is illustrated for depositing the index strips. This may be desirable when the curvature of the faceplate, or some other consideration, rules out the use of the mechanical application of the index phosphor.
  • the photo-sensitive layer may be applied to the ribs 18 by spray or slurry or it may be otherwise deposited. Radiation from ultraviolet source 28 is transmitted through the front of the panel, or it may come from the rear to polymerize the photo-sensitive layer.
  • the two advantages in exposing from the front are that (l) the color producing phosphor strips attenuate the ultraviolet light and (2) the layer next to the glass polymerizes first.
  • Item (1) helps index material off the color phosphor region of the screen (if necessary, a temporary yellow dye can be added to the color phosphors to further suppress the blue anl ultraviolet transmission) and item (2) provides for better adhesion of the phosphors to the faceplate and less criticality in exposure time.
  • Another advnatage of frontal exposure in fact the greatest advantage when the photoresist process is used for screen deposition, is that the faceplate and funnel section can be joined by flame sealing prior to screen construction. This eliminates the need for frit-sealing which is very slow and may run as much as four hours; and it eliminates the need for (and costs incurred in) grinding the glass surfaces which are to be frit sealed.
  • the use of the raised rib 18, whether for direct application of the index phosphor or for photo-application of the index phosphor, substantially improves the process of making beam-index target screens for color kinescopes.
  • FIG. 4 the color producing triads 12B, 14R, 166 are affixed to the faceplate.
  • Aluminum layer 22 is on top of the color triads; and is on top of rib 18 as depicted at 24.
  • ultraviolet light source 28 is shown in FIG. 6 in cylindrical form surrounded by a specially shaped plastic scintillator 29. Space is provided between the scintillator and lamp for air cooling.
  • the ultraviolet radiation from mercury vapor lamp 28 strikes the side Walls of sheet 29 and causes it to scintillate internally.
  • the optical radiation thus generated is transmitted by internal reflections in scintillator 29 to exit terminal 30.
  • Terminal 30 thus constitutes an elongated or ribbon light source and is positioned parallel to the strips of the target screen.
  • the faceplate 11 is twelve 12) inches high, as is the scintillator sheet 29.
  • the thickness of sheet 29 is approximately .015 inch.
  • the resultant light source is 12 x .030 inch. This represents an improvernent of 12/ .030 or 400 over a point source of light measuring .030 x .030 inch.
  • the larger the screen and the longer the light source the greater is the improvement.
  • Mercury vapor lamp 28 can be high pressure or low pressure and it can 'be short wave or long wave.
  • Scintillator 29 is available from Nuclear Enterprises, San Carlos, Calif, and can be identified as their NE-102 and NE-lll.
  • Hyman Pat. 2,710,284 for details on plastic scintillators.
  • the quantum efficiency of these scintillators approaches The light loss through the side walls is acceptable. But even at that, a second layer transmissive of its own scintillations, such as 31, can be used to respond to and capture the radiation from the side wall of 29. The light loss through internal reflections is low.
  • the scintillations of NE-102 are blue-white which means its transmission through the faceplate of ordinary CRT glass is high, and its ability to polymerize the photo-sensitive medium is good. Therefore, a much improved light source is provided for making strip-like target screens.
  • light strip 30 is on the outside of the faceplate 11, is adjacent thereto, and is in line with ri'b 18 which supports the photo-sensitive material.
  • Light strip 30 can be stepped along the faceplate to be in register with each rib 18 in sequence, or it can be placed at a distance from the faceplate to expose the resist through mask 60. In the latter case, openings 61 in the mask 60 may be provided in register with the ribs 18. These openings are displaced from the ribs depending upon the distance that separates source 28 from faceplate 11. The arrangement shown is for so called parallel light input.
  • the best mode however from the point of view of reducing exposure times is to provide a plurality of light strips adjacent to the faceplate with one light strip in register with each strip of photo-resist to be illuminated.
  • the sheets can be stacked, like pages spread in an open book, to receive the input radiation over a broad surface thereof.
  • FIG. 9 shows light strip 30 at the focal point of a lens system.
  • the output of the lens is substantially parallel light.
  • a funnel shaped plastic scintillator 51 is illustrated in side view in FIG. 9 with an exit region 52 corresponding to a point source.
  • the scintillator 51 may surround the primary light source, akin to the arrangement of 29 and 28 or it may be excited by radiation which enters via opening 51 in the funnel, or it may be otherwise excited.
  • the funnel wall is tapered slightly to increase in thickness at the exit region 52. The hole in the funnel at 52 should be closed to provide the maximum concentration of light output.
  • Suitable primary sources of excitation are the type ZA-l high pressure mercury arc lamps supplied by the Zenith Radio Research Corporation (having an arc discharge length of approximately 1 inch) and the type EH6 high pressure mercury arc lamp of the General Electric Company.
  • sources of primary radiation can be used to excite the scintillator such as for example short arc air cooled mercury lamps and plasma sources seeded with zinc which has strong lines in the 3300 angstrom region.
  • a faceplate with shadow mask and frame assembly is depicted at 54 to receive illumination from the funnel 51 via its exit terminal 52.
  • FIG. 7 a method is illustrated for printing the phosphor strips on substrate or faceplate 11.
  • a jig or fixture 40 holds a plurality of brushes which apply, simultaneously, the index material and color producing phosphors.
  • Index brush 32 applies the index material
  • brush 34B applies the blue phosphor
  • brush 36R applies the red phosphor
  • brush 36G applies the green phosphor.
  • All four brushes are held in alignment by fixture 40 which also feeds the phosphor paints to the brushes.
  • the four strips are guided into register with the rib 18 by roller 42 secured to fixture 40.
  • the use of rib or projection 18 for this purpose is novel and advantageous.
  • the rib both supports the index material and guides the brushes to maintain proper alignment and register of the color producing and index signal producing strips.
  • a foraminous electrically conductive mesh may be applied as for example by Saulniers teachings.
  • the brushes 34B, 36R, and 36G deposit the blue, red, and green phosphors.
  • the aluminum layer is deposited.
  • index brush 32 applies the index material.
  • Fixture 40 may apply a single group of phosphors, or preferably it may apply a plurality of groups of phosphors by suitably extending its length.
  • other methods of phosphor application may 'be used such as flame spraying and/or electrostatic spraying.
  • applicants prior teachings of using a rollable target screen may be used. In each case, advantage is taken of the guiding feature of ribs or pro- 10 jections 18 to gain proper registration of the strips on the faceplate.
  • FIG. -8 is akin to FIG. 7 except that fixture 40 is guided by both the rib 18 and the faceplate 11.
  • roller 44 is brought into position at the corner of rib 18 and the faceplate 11 by spring forces depicted at 41 at 43.
  • Indicia 45 on the interior of the faceplate 11 may be used (instead of rib 18) in combination with servo-control means 62.
  • Indicia 45 may be electrically conductive frit embedded in or deposited on the faceplate, or it may be a strip optically distinctive from the surround of the faceplate.
  • electrical or optical feelers may be used to guide feedback controlled means 62 in the printing of the phosphor strips.
  • the phosphor strips are applied in a thickness of approximately .001 inch.
  • an electrically conductive layer comprised of a foraminous mesh, can be mounted directly on the phos phor strips. This provides stabilization of the voltage on the target screen and permits the index radiation to be transmitted rearwardly of the target screen to the scintillator detector 6 of FIG. 1.
  • Indicia 45 may be the index strip itself.
  • the spray technique is preferred to brush application when the target screen is constructed on a faceplate with a non-flat or spherical surface.
  • the assembly If such as assembly is connected to a source of pressurized ink, it will be discharged through the orifice as a non-uniform spray, very much like a garden hose.
  • a source of ultrasonic energy such as a coil driven by an alternating current or a piezoelectric crystal
  • the ink will be discharged from the orifice as a stream of droplets of uniform diameter and at a rate equal to the frequency of the energizing signal.
  • the assembly is driven at kHz, the ink stream will comprise 75,000 droplets per second. If the stream is generated through a .002" diameter orifice, the resulting spot on a piece of paper will be in the order of .010" in diameter. See also Diprose Pat. 3,404,280 and Loughren Pat. 3,404,221.
  • resin layer 9 and implosion panel 8 are added to the faceplate of the tube as one of the final steps in the production of a color kinescope.
  • the properties of panel 8 and layer 9 take on additional meaning in a beam-index system.
  • Conventional faceplate glass (Corning 9019 clear; 9024 tinted, polished, 40% transmission; 9026 tinted, polished, 50% transmission) is transmissive of radiation occupying a narrow region of the ultraviolet spectrum from approximately 3600-4000 angstroms. But this is precisely the wavelength region in which the P-16 phosphor (calcium magnesium silicate) radiates in response to electron bombardment; and radiation in this range of wavelengths excites the scintillator detector 6.
  • the target screen is composed of an opaque layer of phosphors and a light reflective aluminum layer is mounted on top thereof that nevertheless a certain amount of visible radiation is transmitted through the target screen and faceplate assembly. Saulnier estimates the transmission to be in the order of 3%. I have not made this measurement. But, I have measured the effects of daylight (and artificial illumination) on the scintillator 6 and photodetector 5. The ultraviolet component of this illumination is transmitted through the glass faceplate, the target screen, and the funnel of the CRT. It strikes scintillator 6 and shows up as random noise which masks the index signal in the output of the photodetector. This is most undesirable. Fortunately, there is a simple solution.
  • the faceplate or implosion panel can be made with special glass to achieve the results of attenuating all optical radiation to which the scintillator is responsive.
  • Another alternative is to use NE-102, the very material from which scintillator 6 is made, as the faceplate filter. This material sharply attenuates ultraviolet radiation below 4000 angstroms and is highly transmissive of visible radiation. Indeed, it is this unusual property which enables scintillator 6 to be used without suffering interference from the visible content of the picture which is produced on the target screen.
  • the method of making an electron-sensitive, radiation-emitting, line-screen target assembly for a cathode ray tube comprising the steps of (1) forming an elongated fiducial mar-k on a sub-strate on which the line screen is to be afiixed, said fiducial mark including material capable of yielding optical signals for control purposes which are distinct from those yielded by the substrate, (2) applying energy to said material in order to generate the optical control signals, (3) depositing on said sub-strate elongated strips of electron-sensitive radiation-emitting phosphor material in register with said fiducial mark, and (4) controlling the relative displacement, in response to said optical control signals, between the elongated fiducial mark and the strips of radiation-emitting phosphor material.
  • the method of making an electron-sensitive, radiation-emitting, line-screen, target assembly for a cathode ray tube comprising the steps of (1) forming an elongated fiducial mark on a sub-strate on which the line screen is to be affixed, said fiducial mark including material capable of yielding electrical signals for control purposes which are distinct from those yielded by the substrate, (2) applying an electrical probe to said material in order to provide the electrical control signals, (3) depositing on said sub-strate elongated strips of electron-sensitive radiation-emitting phosphor material in register with said fiducial mark, and (4) controlling the relative displacement, in response to said electrical control signals, be-
  • the method of making an electron-sensitive, radiation-emitting, line-screen, target assembly for a cathode ray tube comprising the steps of (1) forming an elongated fiducial mark on a sub-strate on which the line screen is to be aflixed, said fiducial mark being in the form of a mechanical discontinuity on said substrate, (2) applying a mechanical feeler to the discontinuity in order to provide control signals, (3) depositing on said sub-strate elongated strips of electron-sensitive radiation-emitting phosphor material in register with said fiducial mark, and (4) controlling the relative displacement, in response to said control signals, between the elongated fiducial mark and the strips of radiation-emitting phosphor material.
  • step of depositing said strips of phosphor material in register with the fiducial mark includes the feature of simultaneously depositing at least two different color producing phosphors.
  • the step of depositing said strips of phosphor material in register with the fiducial mark includes the feature of simultaneously depositing at least two different color producing phosphors.
  • step of depositing said strips of phosphor material in register with the tfiducial mark includes the feature of simultaneously depositing at least twodifferent color producing phosphors.
  • the method of claim 1 including the additional steps of (1) depositing an electrically conductive layer on said strips of phosphor material and (2) depositing on said conductive layer elongated strips of electron-sensitive radiation-emitting material in register with said fiducial mark.
  • the method of claim 3 including the additional steps of (1) depositing an electrically conductive layer on said strips of phosphor material and (2) depositing on said conductive layer elongated strips of electron-sensitive radiation-emitting material in register with said fiducial mark.

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US772639A 1968-11-01 1968-11-01 Cathode ray tubes with target screens and the manufacture thereof Expired - Lifetime US3598628A (en)

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US77263968A 1968-11-01 1968-11-01
FR7129034A FR2148887A5 (de) 1968-11-01 1971-08-09
NL7110956A NL7110956A (de) 1968-11-01 1971-08-09
DE2139902A DE2139902A1 (de) 1968-11-01 1971-08-09 Kathodenstrahlroehren mit bildschirm sowie vorrichtung und verfahren zur herstellung derselben

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DE (1) DE2139902A1 (de)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2223015A1 (de) * 1972-01-14 1973-07-19 Rca Corp Photographisches verfahren zum herstellen einer leuchtstoffstreifenanordnung auf einem bildschirmtraeger einer farbfernsehbildroehre
US3852132A (en) * 1972-05-17 1974-12-03 Gen Electric Method of manufacturing x-ray image intensifier input phosphor screen
US3852131A (en) * 1972-05-17 1974-12-03 Gen Electric Method of manufacturing x-ray image intensifier input phosphor screen
US3936302A (en) * 1972-02-07 1976-02-03 Hitachi, Ltd. Method for manufacturing fluorescent screens for use in colour picture tubes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2223015A1 (de) * 1972-01-14 1973-07-19 Rca Corp Photographisches verfahren zum herstellen einer leuchtstoffstreifenanordnung auf einem bildschirmtraeger einer farbfernsehbildroehre
US4049451A (en) * 1972-01-14 1977-09-20 Rca Corporation Method for forming a color television picture tube screen
US3936302A (en) * 1972-02-07 1976-02-03 Hitachi, Ltd. Method for manufacturing fluorescent screens for use in colour picture tubes
US3852132A (en) * 1972-05-17 1974-12-03 Gen Electric Method of manufacturing x-ray image intensifier input phosphor screen
US3852131A (en) * 1972-05-17 1974-12-03 Gen Electric Method of manufacturing x-ray image intensifier input phosphor screen

Also Published As

Publication number Publication date
DE2139902A1 (de) 1973-02-15
NL7110956A (de) 1973-02-13
FR2148887A5 (de) 1973-03-23

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