EP0211963B1 - Farbbildkathodenstrahlröhre, Komponente dafür und ihr Herstellungsverfahren - Google Patents

Farbbildkathodenstrahlröhre, Komponente dafür und ihr Herstellungsverfahren Download PDF

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Publication number
EP0211963B1
EP0211963B1 EP84111579A EP84111579A EP0211963B1 EP 0211963 B1 EP0211963 B1 EP 0211963B1 EP 84111579 A EP84111579 A EP 84111579A EP 84111579 A EP84111579 A EP 84111579A EP 0211963 B1 EP0211963 B1 EP 0211963B1
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EP
European Patent Office
Prior art keywords
faceplate
mount
foil
pattern
registration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP84111579A
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English (en)
French (fr)
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EP0211963A3 (en
EP0211963A2 (de
Inventor
Kazimir Palac
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Zenith Electronics LLC
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Zenith Electronics LLC
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Publication of EP0211963A2 publication Critical patent/EP0211963A2/de
Publication of EP0211963A3 publication Critical patent/EP0211963A3/en
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    • 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
    • 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
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • 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
    • 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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes

Definitions

  • This invention relates in general to color cathode ray tubes, and in particular to a color selection electrode assembly for use therein. Of equal significance, the invention is concerned with methods of manufacturing the electrode assembly as well as a cathode ray tube utilizing the assembly.
  • a color selection electrode or "shadow mask” is a device which is disposed adjacent the luminescent phosphor screen that forms the target electrode of a color cathode ray tube, to control the landing pattern of one or more electron beams as they are swept across the screen.
  • the shadow mask achieves color selection by partially shadowing the surface of the screen from scanning electron beams, permitting access to selected elemental phosphor areas by those beams.
  • the choice of a color selection electrode for use in color television cathode ray tubes is, by and large, a choice between a non- tensed electrode and a tensed electrode. The most common type of color selection electrode used in color television receivers today is the non- tensed type.
  • the general practice in cathode ray tubes manufactured for use in color television receivers is to position the untensed mask at an assigned location, relative to the phosphor screen, by suspending it from three preselected points disposed about the periphery of the tube's face panel.
  • This suspension accommodates overall thermal expansion of the mask by causing the mask to be displaced toward the screen from its original position by provision of bi-metallic support springs; however, such provision can not resolve the above-dbscribed localized "doming" problem caused by concentrated heating in localized areas of the mask.
  • Cathode ray tubes using tensioned color selection electrode are known such as the electrode used with a cylindrical faceplate CRT as described in U.S. Patent No. 3,638,063.
  • the color selection electrode comprises a grid formed of a multitude of parallel conductors tensed across a rigid frame. This grid serves to mask the wiring beams to fall upon the desired light emitting phosphor.
  • the mask supporting frame is mechanically, stressed, as by compressing it, prior to attaching the shadow mask thereto. Upon release of the compression force, restoration forces in the frame establish tension in the mask.
  • An advantage of utilizing a tensed mask resides in the fact that the mask, while under tension, will not readily submit to "doming".
  • the mask retains its desired configuration until the heat generated by the scanning beams impinging thereon is sufficient to cause the area of the mask under bombardment to "relax" enough to negate the pre-established expansion of the mask with resultant development of color impurities.
  • the color television cathode ray tube in most common usage today employs a faceplate which approximates a section of a large radius sphere.
  • the shadow mask in such a tube is contoured to match the faceplate.
  • a trend today is toward a flatter faceplate which, in turn, calls for a flatter shadow mask.
  • One approach currently being pursued resorts to an untensed flat metal mask employed in conjunction with a substantially flat faceplate.
  • a flat mask is inherently less mechanically stable than a curved mask. Accordingly, to acquire stability, resort is had to a thicker mask, for example, one having a thickness in the order of 2.54 to 3.05 mm (10 to 12 mils). This is approximately twice the thickness of a conventional curved mask.
  • the aperture etching process is presented with horrendous problems. Specifically, in order to prevent aperture limiting of the beam at the outer reaches of the mask, as would be encountered in a 90 degree tube, the apertures have to be etched at an angle to the plane of the mask, rather than etched substantially perpendicular to that plane as is the case for a conventional curved mask.
  • U.S. Patent No. 3,284,655 to -Oess is concerned with a direct viewing storage cathode ray tube employing a mesh storage target which is supported in a plane perpendicular to the axis of the tube.
  • the mesh target comprises a storage surface capable of retaining a charge pattern which, in turn, control the passage therethrough of a stream of electrons.
  • mesh storage screen be affixed (no details given) to a circumferential ring that is disposed across the open end of envelope member. One end of the ring is in contact with the edge of the envelope member which has a coating of glass frit applied thereon.
  • the electrode spanning the inside of the tube envelope is a mesh screen that is not said to be subject to tension forces.
  • the mesh screen is not a color selection electrode that serves to direct a writing beam selected elemental areas of color phosphors.
  • U.S. Patent No. 2,813,213 describes a cathode ray tube which employs a switching grid mounted adjacent the phosphor screen to provide a post deflection beam deflecting force. Basically, it is proposed to employ a taut wire grid that is sealed in the tube envelope wall. In one embodiment, an external frame is used to relieve the tension forces applied by the taut grid to the glass wall of the tube. In another embodiment, an arrangement is generally suggested but not specifically disclosed utilizing a glass donut-shaped structure into which the grid wires are sealed. This donut assembly is proposed for insertion between the faceplate of the tube and its conical section. Following tube assembly, the patent indicates that the phosphors may be deposited on the faceplate by conventional photographic processes.
  • GB-A-2 052 148 discloses a color selection electrodes assembly which can be used for screening a pattern of primary color elemental phosphor areas upon the inner surface of a faceplate for a color cathode ray tube and which assembly can also form the color selection electrode in the finished cathode ray tube.
  • the assembly includes a shadow mask secured to a surrounding frame.
  • the frame has a number of pins designed for mating engagement with a corresponding number of recesses formed on the inner surface of the faceplate to assure proper positioning of the assembly with the faceplate during the multiple screenings required during tube manufacture.
  • the combined frame and shadow mask thus form the color selection electrode of the tube and is disposed wholly within the finished tube supported by a number of springs secured to the rear of the frame in operative relation to the tube faceplate.
  • the present invention therefore provides a color selection electrode assembly utilizable for screening a pattern of luminescent primary color elemental phosphor areas upon the inner surface of an associated faceplate utilized in the manufacture of a color cathode ray tube and wherein said assembly includes a mount defining a central opening and a planar foil having a predetermined pattern of apertures secured on said mount across said opening, said foil having a temperature coefficient of expansion which is not greater than that of said mount, said mount having indexing means adapted for cooperation directly with registration affording means on the associated faceplate such that upon engagement of said mount with the associated faceplate during tube manufacture the mount indexing means directly mating with the registration affording means permits repeatable precise registrations between said planar foil and the associated faceplate to facilitate screening said pattern upon the inner surface thereof, as well as to facilitate a subsequent mating of said planar foil to the associated faceplate with said foil apertures in registration with said elemental phosphor areas of said pattern during final affixation of said foil to the associated faceplate, characterized in that the mount has a central opening of
  • a further aspect of the invention includes a method of making a color cathode ray tube with a faceplate having a target surface and having registration affording means, and with a color selection electrode arrangement comprising a mount defining a central opening, an apertured planar foil secured to said mount, and indexing means borne by said mount and directly cooperable with said registration affording means of said faceplate, said method comprising the steps of securing across said opening in said mount a planar foil with a predetermined pattern of apertures therein and having a temperature coefficient of expansion not greater than that of said mount, and photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said foil as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with the registration of affording means on said faceplate, said method being characterized by the steps of providing said registration affording means on the external periphery of the faceplate and further providing the central opening of said mount with sufficient span to encompass the target surface
  • One of the features of the invention is that it provides a color selection electrode of the tensed type which has the anti-doming attribute of tension-type electrodes, but without the power handling limitations of pribr art tension electrode systems.
  • a further advantage of the invention is that it provides an envelope-captivated tensed color selection electrode system having the advantages of such systems, yet which is readily adapted to conventional color tube photoscreening methods and apparatus.
  • a feature of a preferred embodiment of the invention seeks to resolve the aperture etching problem mentioned above with present-day tubes using a flat mask thru the use of a color selection electrode assembly characterized by a thin, flat, tensed foil which, by virtue of its mounting, is mechanically stable and which is thin enough as to not be afflicted with the aggravated aperture etching problems posed by a thick mask.
  • a color selection electrode assembly 10 constructed in accordance with a preferred embodiment of the invention, is shown in Figure 1 associated with and forming an integral part of a color television cathode ray tube 12.
  • Tube 12 is depicted therein in a perspective exploded format as an aid in visualizing the inventive concept.
  • electrode assembly 10 is utilizable as a stencil for use in screening a pattern of luminescent primary color elemental phosphor areas upon the target surface 14 of the envelope section 16 that comprises the faceplate of tube 12.
  • faceplate 16 is depicted as a glass panel formed of a material having a predetermined temperature coefficient of expansion and having a rearwardly extending skirt 18 that circumscribes target surface 14.
  • skirt 18 establishes the Q spacing for tube 12, that is, the distance between target surface 14 and its shadow mask, which, in the subject invention, comprises an apertured foil which is described in detail below.
  • the end surface 20 of skirt 18, which is remote from facepanel 16, constitutes a sealing land, a surface for receiving a bead of frit 22, a devitrifying glass adhesive employed in fabricating cathode ray tubes.
  • the frit employed is a low-temperature solder glass material which is available from Owens-Illinois Inc. under their designation CV-130.
  • the electrode assembly 10 upon completion of its screening function is thereafter, at the option of the practitioner, frit sealable to faceplate 16 to permit selective excitation of the primary color phosphors by a scanning electron beam(s) when that assembly forms a constituent of a color cathode ray tube.
  • faceplate 16 is provided with registration affording means or alignment elements, which take the form of a plurality of V-grooves 24; in this execution they constitute three slots which are milled into the surface of the faceplate's sealing land 20.
  • the included angle defined by the sloping walls of grooves 24 approximate sixty degrees and they are oriented so that the bottom of each groove lies along a line that extends radially from the geometric center of the faceplate.
  • V-grooves 24 do not extend completely across sealing land 20, see Figures 1a and 3.
  • the depicted construction is resorted to in order to avoid a direct communication through skirt 18 of the faceplate which could compromise vacuum integrity once the faceplate has been frit sealed to electrode assembly 10 and to a funnel 26.
  • funnel 26 has a sealing land 28 which geometrically matches faceplate sealing land 20.
  • funnel sealing land 28 may be provided with a corresponding plurality of alignment elements (only two shown), which also take the form of V-grooves 24' milled into sealing land 28 and which are spatially aligned with the faceplate V-grooves 24.
  • V-grooves 24' Recourse to V-grooves 24' is optional since it is appreciated that other means for aligning the funnel sealing land 28 with faceplate sealing land 20 are well known.
  • a common practice is to use an "outside" reference system,that is, one in which the funnel is aligned to the face panel by positioning it against referencing snubbers.
  • funnel land 28 receives a bead 22' of frit.
  • faceplate 16, as well as funnel 26, which includes a neck 27, are formed of a material, e.g., a glass or ceramic composition, having a predetermined temperature coefficient of expansion and which is readily amenable to frit sealing techniques.
  • the color selection electrode arrangement 10 shown in Figure 1 comprises an auxiliary sever- able mount 30 defining a central opening of sufficient span to enable the mount to surround the periphery offaceplate 16. Stated otherwise, the internal configuration of the mount essentially conforms to the periphery of the faceplate, see Figures 2 and 3.
  • Mount 30, which adopts a rectangular configuration, is readily formed from four butt-welded strips of L-shaped angle metal. Strips of other geometry, of course, are also suitable. In any event, mount 30 is fomed of a material having a temperature coefficient of expansion greater than that of envelope sections 16 and 26.
  • mount 30 can be formed from cold rolled steel, stainless steel, nickel or monel to name a few of the materials found acceptable in practicing the invention.
  • Electrode assembly 10 further comprises, at this stage, an untensed planar foil 32 which has a predetermined pattern of apertures which may be triads of minute circular holes or, as now favored in state of the art color television tubes, a myriad of elongated narrow slots disposed perpendicular to the major axis of the foil.
  • the foil is tautly drawn across the mount under the minimum tension required to render the foil planar and it is then secured to mount 30 by brazing or welding.
  • foil 32 will subsequently be converted to a tension mask during the process employed to embody it as a constituent of a cathode ray tube.
  • Foil 32 has a temperature coefficient of expansion which is not greater than that of mount 30 and, preferably a temperature coefficient less than that of the mount.
  • foil 32 can be formed from cold rolled steel, or invar, to name two substances, each of which are utilizable with mounts made from any of the above-mentioned mount materials.
  • the thickness of foil 32 should be less than 5.1 mm (2 mils) otherwise unacceptable stresses will be induced in a faceplate when the foil is subsequently tensed and frit sealed to the faceplate.
  • a foil having a thickness equal to or less than 2.5 mm (1 mil) is most suitable in practicing the invention.
  • foils having a thickness of 1.3 mm (one-half mil) or less are realizable and find practical application in the practice of the invention.
  • foil mount 30 and faceplate 16 are essential in order to utilize foil 32 as a stencil in screening a pattern of different elemental phosphor areas upon target surface 14 of the faceplate.
  • mount 30 comprises indexing means in the form of a plurality of studs 34, one end of each being detachably secured to a resilient coupling, e.g., a leaf-type spring 35, aperture at 36, and having one end fixed to mount 30, see Figure 3.
  • a resilient coupling e.g., a leaf-type spring 35, aperture at 36, and having one end fixed to mount 30, see Figure 3.
  • the purpose of the resilient coupling 35 is to accommodate the difference in expansion, as between the envelope glass and the mount metal, when the assemblage is subsequently frit sealed.
  • each stud 34 comprises a headed bolt 37, the distal end of which is threadably received in a rounded abutment which can take the form of a button or boss 38.
  • buttons or bosses comprise an alloy composition, the coefficient of expansion of which is compatible with the envelope glass.
  • a glass sealable metal alloy suitable for this purpose is available from Carpenter Technology Corporation in Reading, Pennsylvania under their designation 430TI.
  • the shaft of bolt 37, which extends through spring aperture 36, is enclosed by a tubular spacer 39 which determines the spacing between spring 35 and button 38.
  • that portion of mount 30 adjacent spring 35 is provided with a clearance hole 40 to provide access to bolt 37.
  • each boss is to cooperate with an assigned faceplate V-groove 24 during screening of the faceplate and, additionally, with an assigned V-groove 24' on the sealing land 28 of funnel 26 when the foil is finally integrated in tube 12.
  • boss 38 adopts a diameter such that when it is seated upon the inclined walls of faceplate groove 24 and/or funnel groove 24', the respective sealing lands 20 and 28 of the faceplate and funnel are maintained in a predetermined spaced-apart relation.
  • This spacing which can be in the order of five to ten mils (.005-.010 in.), depending, in part, upon the size of the tube, is provided to accommodate a subsequent application of the sealing frit 22.
  • an alternative registration arrangement for effecting a six-point contact between foil mount 30 and face panel 16 contemplates the "external" approach shown in Figure 5. More particularly, as a registration affording means the face panel is fitted with three (only one shown) externally mounted, outwardly directed break-away pins 46, which, geometrically, adopt the same relative locations as those occupied by V-grooves 24 on the face panel shown in Figure 1. Indexing means cooperating with each of the pins 46 comprises a tab 48 affixed to foil mount 30. Tab 48 has a depending finger 50 which, in turn, is provided with a bifurcation 52 at its distal end.
  • mount 30 is supported over the face panel with a finger bifurcation 52 poised over its assigned pin.
  • mount is lowered, a six-point contact is established between the three pins 46 and their cooperating bifurcations 52.
  • This registration between the foil mount and the face panel is repeatable as often as is required to accomplish screening of the target surface of the face panel, as well as to effect a final registration between the foil mount and the face panel prior to frit sealing.
  • pins 46 may be broken away from the face panel.
  • a known and widely used method of preparing color phosphor screens utilizes a process which has developed from familiar photographic techniques. To this end, a slurry comprising a quantity of a primary color phosphor particles suspended in a photosensitive organic solution (pva), is applied, as a coating, to the target surface 14 of faceplate 16. Mount 30, with a taut, but untensed, foil attached thereto is then seated upon faceplate 16 by effecting a registration between stud bosses 38 and their assigned faceplate grooves 24.
  • pva photosensitive organic solution
  • the registered faceplate and electrode mount assemblage is then inserted in a lighthouse 41 comprising a source of light 42 actinic to the photosensitive coating.
  • a source of light 42 occupies a spatial position corresponding, in effect, to the axial position of the source of the electron beam that will subsequently excite the phosphor pattern to be created.
  • the slurry coating would be exposed to actinic light rays that pass through a conventional beam trajectory compensating lens before encountering the mask apertures.
  • the light transmitted through the mask then creates a latent image of the mask's aperture pattern on the coated faceplate.
  • this conventional exposure step requires modification. More particularly, it must be borne in mind that first, the instant screening process is utilizing an untensed foil and secondly, this untensed foil will subsequently be converted to a tension foil before it will be employed as a color selection electrode to address the patterned phosphor screen it stenciled when it was in its untensed state.
  • the significance of this is that the apertures in a tensed foil are radially outwardly displaced from the spatial positions they occupied in the untensed foil so that, absent a provision to account for this spatial displacement of the foil apertures, the tensed foil would fail to effect a proper registration of the electron beam landing areas with the elemental phosphor areas of the screen it stenciled when it was untensed.
  • the light rays from actinic source 42 are directed through a special lens 44 which redirects the light- rays before they traverse foil 32 so that they impinge the phosphor slurry at points radially outwardly from the points they would have, absent the lens.
  • the lens serves to displace the light rays from their original paths so that, upon encountering the slurry, they create a latent image corresponding to the image that would be created if a tensed foil had been employed (sans lens) as the stencil.
  • a lens is introduced between the light source and the stenciling mask in order to compensate for the fact that the trajectory of an electron beam under deflection differs from the path of a light ray originating from the same point source as the electron beam.
  • the reference to a "special" lens contemplates a lens which, in addition to effecting the aforementioned compensation, also introduces a correction that insures that a pattern screened by an untensed foil can later be addressed by a tensed foil.
  • the light source is moved slightly forward so as to move the light landing areas radially outward.
  • a second order of correction is to adopt a lens design to compensate for whatever error the physical forward displacement of the light source failed to correct.
  • a suggested procedure entails initially exposing a coated substrate through an untensed foil and developing a pattern therefrom. Thereafter the untensed foil is subjected to a controlled laboratory heat environment until the foil develops the same aperture dimensions and locations that a foil develops when it undergoes the frit sealing process and goes into tension. The laboratory "grown" foil is then seized and maintained in its tensed state. This tensed foil can then be used to cast a pattern of light upon another substrate duplicate of faceplate 16, which pattern is then compared to the light pattern created by an untensed foil. This disparity, or difference, in aperture locations is then reverse engineered with the aid of a computer into a lens design.
  • This lens when employed in conjunction with an untensed mask, will now direct actinic light rays along paths which impinge the phosphor coating at those points the light rays, sans lens, would have impinged the coating had they pierced a tensed mask.
  • numbers of faceplates are screened in this fashion and then incorporated into cathode ray tubes. The screens are then illuminated to analyze beam landing areas and any discrepancies noted. Corrective information is then fed back into the lens design.
  • mount 22 and the foil are then removed and the substrate is washed.
  • this wash will remove the exposed portion of the coating.
  • the exposed coating is processed to establish upon target 14 a pattern of elemental phosphor areas, corresponding to the aperture pattern that would have resulted from using a tensed foil (sans special lens).
  • the slurry coating, foil mount registrations, exposure and wash steps are then repeated for each of the other primary color phosphor areas to be applied to target surface 14, with the source of actinic light, of course, disposed at appropriately different positions with respect to foil 24.
  • the resultant luminescent screen comprises a pattern of interleaved primary color phosphor areas that would have been created by a tensed foil without use of special lens 44.
  • successive repositioning of the light source, prior to exposing the target screen through the foil is such as to effectively mimic the positions of three scanning electron beams issuing from a gun mount later to be fitted to the tube.
  • the resultant luminescent screen pattern will bear a unique geometric relationship, or orientation, to the light sources and, thereby, to the electron beam axes of the subsequently fitted electron gun mount.
  • the foil employed to pattern the screen is mated to the faceplate.
  • the upwardly facing sealing land surface 20 of faceplate 16 and the downwardly facing land surface 26 of funnel 24 are coated with beads of low-temperature frit 22 after mount 30 is re- registered with faceplate 16 by inserting bosses 38 in grooves 24.
  • Funnel 26 is then fitted over the foil with its V-grooves 34' receiving stud bosses 38.
  • This assemblage is then inserted into a heat chamber, or oven, the temperature of which is elevated to approximately 430 degrees Centigrade and maintained thereat for thirty to forty-five minutes. These are the temperature and time parameters required to devitrify low-temperature Owens-Illinois type CV-130 frit material. As the temperature rises, faceplate 16 and funnel 26 will expand by an amount determined by their characteristic temperature coefficients of expansion. Simultaneously, mount 30 and foil 32 will also expand but, because of their greater temperature coefficients of expansion, their growth, relative to the faceplate and funnel, will be greater. By the time this assemblage has reached a temperature of 430 degrees Centigrade, and by the time the frit has devitrified, mount 30 and foil 32 will have staibilized their expansion, as will have the funnel and face panel.
  • foil 32 is captured therein between funnel 26 and the faceplate 16. Thereafter, as the assemblage cools down to room temperature and the materials return, or attempt to return, to their normal dimensions, foil 32 will be tensed by virtue of the captivating action of the funnel-faceplate frit junction which will prevent the foil from returning to its normal room temperature dimension.
  • the mask which was "grown” by the heat attendant upon the frit sealing process, is trapped in tension and maintained thereafter by the devitrified frit joining the funnel and faceplate.
  • foil 32 With foil 32 now in a tensed state, the foil apertures occupy different spatial positions than they did when the foil was in its original untensed state. However, since the screen phosphor pattern was created in conjunction with lens 44, that simulated the light pattern that would be transmitted by a tensed foil, all as discussed above, the tensed foil will be in registration with the phosphor pattern.
  • mount 30 is removed from the captivated foil by first severing the foil along the inside perimeter of the mount. Then the stud bolts 37 are unscrewed from their bosses 38, which have been sealed into the V-grooves of the face panel and the funnel with the devitrifying frit, thus permitting removal of mount 30 from the assemblage. (The mount, of course, is reuseable). Thereafter, an electron gun assembly is inserted into the neck portion of the funnel and sealed thereto to provide a color cathode ray tube embodying a novel color selection electrode. The foil is trimmed as close to the perimeter of the faceplate- funnel junction as possible. After the exhaust process, the face panel-funnel junction is covered with a coating of insulating material to prevent external contact with the foil which, depending upon the excitation system utilized with the completed tube, may be maintained at a high electrical potential.
  • the alignment elements utilized by the faceplate and funnel, as well as the indexing means used for the foil mount need not be restricted to the groove and boss format disclosed.
  • materials other than those disclosed for the envelope sections and the mount and foil can be used so long as the coefficients of expansions of such materials provide the differential expansion required to tense an initially untensed foil.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Claims (10)

1. Farbauswahlelektrodenanordnung (10), die zum Auftragen eines Musters von Grundfarben-Leuchstoffelementen auf die Innenfläche eines zugeordneten Schirmträgers (16), der bei der Herstellung einer Farb-Kathodenstrahlröhre (10) verwendet wird, wobei die genannte Anordnung (10) einen Träger (30) besitzt, der eine zentrale Öffnung aufweist, und eine auf dem Träger befestigte und die Öffnung bedeckenden ebenen Folie (32), die ein vorherbestimmtes Muster von Öffnungen besitzt und deren Wäremeausdehnungskoeffizient nicht größer ist als der des Trägers, wobei der Träger (30) Positioniermittel (48) besitzt, die derart zum direkten Zusammenwirken mit Paßmitteln (46) des zugeordneten Schirmträgers (16) geeignet sind, daß beim Anlegen des Trägers (30) an den zugeordneten Schirmträger (16) während der Herstellung der Röhre die Positioniermittel (48) des Trägers direct an den Paßmitteln (46) anliegen, so daß die ebene Folie (32) und der zugeordnete Schirmträger (16) wiederholt genau miteinander zur Deckung gebracht werden können und dadurch das Auftragen des Musters auf die Innenfläche (14) des Schirmträgers und danach endgültigen Befestigen der Folie (32) an dem zugeordneten Schirmträger (16) das passende Anlegen der ebenen Folie (32) an dem zugeordneten Schirmträger (16) derart, daß die Öffnungen der Folie mit den Leuchtstoffelementen des Musters korrespondieren, erleichtert wird, dadurch gekennzeichnet, daß die zentrale Öffnung des Trägers (30) größer ist als der zugeordnete Schirmträger (16), daß die Positioniermittel (48) auf dem Träger (30) derart angeordnet sind, daß sie außerhalb der Innenfläche (14) des zugeordneten Schirmträgers (16) direkt an den darauf vorgesehenen Paßmitteln (46) zur Anlage gebracht werden können, und daß nach dem endgültigen Befestigen der Folie (32) an dem zugeordneten Schirmträger (16) der Träger (30) von der ebenen Folie (32) abnehmbar ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Paßmittel 46) von einem zugeordneten Schirmträger (16) abnehmbar sind und daß die Positioniermittel (48) ein System von gerundeten Elementen (46) zum Eingriff in V-Nuten (52) umfassen, die so ausgebildet sind, daß mindestens die Paßmittel (46) von dem zugeordneten Schirmträger (16) leicht abnehmbar sind.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Folie (32) an dem Träger (30) durch eine Schweiß- oder eine Lötverbinding befestigt ist.
4. Vorrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der Träger (30) und die ebene Folie aus kaltgewalztem Stahl bestehen.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Träger (30) aus nichtrostendem Stahl und die ebene Folie (32) aus kaltgewalztem Stahl oder Invar besteht.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die ebene Folie (32) aus kaltgewalztem Stahl in einer Dicke im Bereich von 1,3 bis 5,1 mm besteht.
7. Verfahren zum Herstellen einer Farb-Kathodenstrahlröhre mit einem Schirmträger (16), der eine Auftrefffläche (14) und Paßmittel (46) besitzt, und mit einer Farbauswahlelektrodenanordnung (10), die einen eine zentrale Ausnehmung begrenzenden Träger (30), einer an dem Träger (30) befestigten, mit Öffnungen ausgebildeten, ebenen Folie (32) und von dem Träger (30) getragenen Positioniermitteln (48), die direkt mit dem Paßmittel (46) des Schirmträgers (14) zusammenwirken können, wobei das Verfahren folgende Schritte umfaßt: eine ebene Folie (32) mit einem Wärmeausdehnungskoeffizienten, der nicht größer ist als der des Trägers (30) und mit einem vorherbestimmten Muster von Öffnungen wird derart befestigt, daß sie die Ausnehmung in dem Träger (30) bedeckt, auf die Auftreffläche (14) wird photographisch ein Muster von Leuchtstoffelementen aufgetragen, wobei die Folie (32) einmal oder mehrmals als photographische Schablone verwendet und dabei infolge der Anlage der Positioniermittel (48) des Trägers (30) und der Paßmittel (46) des Schirmträgers (16) aneinander der Träger (30) und der Schirmträger (16) miteinander in Deckung gehalten werden, wobei das Verfahren durch folgende Schritte gekennzeichnet ist: die Paßmittel (46) werden auf dem Außenumfang des Schirmträgers (16) vorgesehen, die zentrale Ausnehmung des Trägers (30) wird so groß ausgebildet, daß sie die Auftreffläche (14) des schirmträgers (16) einschließt, und das Verfahren ferner dadurch gekennzeichnet ist, daß nach dem photographischen Schritt oder den photographischen Schritten die Folie (32) an dem Schirmträger (16) befestigt wird und dabei der Träger (30) und der Schirmträger (16) erneut derart miteinander in Deckung gehalten werden, daß infolge der Anlage der Positioniermittel (48) des Trägers (30) und der Paßmittel (46) am Außenumfang des Schirmträgers das Muster der Öffnungen der Folie (32) mit dem Muster der Leuchtstoffelemente auf dem Schirmträger (16) korrespondiert, und daß danach der Träger (30) von der Folie (32) entfernt wird, so daß die Maske derart an dem Schirmträger (16) befestigt bleibt, daß das Muster der Öffnungen der Folie (32) mit dem Muster der Leuchtstoffelemente auf dem Schirmträger (16) korrespondiert.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß nach dem photographischen Schritt oder den photographischen Schritten die Paßmittel (46) vom Umfang des Schirmträgers (16) entfernt werden.
9. Verfahren nach einem der Ansprüche 6 bis 8, gekennzeichnet durch folgende Schritte: auf die Auftrefffläche (14) des Schirmträgers (16) wird ein lichtempfindlicher Überzug aufgetragen; die Positioniermittel (48) des Trägers (30) werden vorübergehend an den Paßmitteln (46) des Schirmträgers (16) zur Anlage gebracht, um den Träger (30) derart mit dem Schirmträger (16) zur Dekkung zu bringen, daß die Folie als Schablone dienen kann, eine Quelle (42) von aktinischen Lichtstrahlen wird wahlweise so angelegt, daß der lichtempfindliche Überzug durch das Muster der Öffnungen der Folie (32) hindurch belichtet wird, wobei die Lichtquelle (42) so angeordnet wird, daß sie mit der Lage des Elektronenstrahls korrespondiert, der später zum Abtasten des Musters von Leuchtstoffelementen verwendet wird, zwischen der Quelle (42) der aktinischen Lichtstrahlen und dem in Deckung befindlichen Träger (30) werden Korrekturlinsenmittel (44) derart angeordnet, daß sie die Strahlen veranlassen, durch die Öffnungen der Folie hindurch auf dem lichtempfindlichen Überzug an Stellen aufzutreffen, die gegenüber den Stellen versetzt sind, an denen ohne die Linse (44) die Strahlen auf dem Überzug auftreffen würden, der Träger (30) und die Folie (32) werden entfernt, durch Behandlung des belichteten Überzuges wird ein Muster von Leuchtstroffelementen erzeugt, das dem Muster der Öffnungen der Folie (32) entspricht, und die vorstehenden Schritte werden für jedes herzustellende Muster von Leuchtstoffelementen wiederholt.
10. Verfahren nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die herzustellende Farb-Kathodenstrahlröhre einen Kolbenteil (24) besitzt, der einen Dichtteil (26) besitzt, und daß der Schirmträger (16) einen die Auftreffläche (14) umgebende Dichtteil (20) besitzt, die dem Kolbenteil (24) geometrisch angepaßt ist, wobei das Verfahren dadurch gekennzeichnet ist, daß auf die Dichtteile (20, 26) des Kolbenteils (24) und des Schirmträgers (16) eine Raupe aus Fritte aufgetragen wird, daß die Farbauswahlelektrodenanordnung (10) derart auf dem Schirmträger (16) positioniert wird, daß die Positioniermittel (48) des Trägers mit den Paßmitteln (46) des Schirmträgers korrespondieren, daß der Kolbenteil (24) derart auf der Farbauswahlelektrodenanordnung (10) positioniert wird, daß der Dichtteil (26) des Kolbenteils mit dem Dichtteil (20) des Schirmträgers korrespondiert, daß die aus dem Kolbenteil (24), der Farbauswahlelektrodenanordnung (10) und dem Schirmträger (16) bestehende Baugruppe in eine Heizkammer eingebracht wird, daß die Temperatur der Heizkammer derart erhöht wird, daß die genannte Baugruppe einer Fritteentglasungstemperatur ausgesetzt wird und gleichzeitig der Schirmträger (16), der Träger (30) die Folie (32) und der Kolbenteil (24) eine Ausdehnung um einen durch ihren charackteristischen Wärmeausdehnungskoeffizienten bestimmten Betrag erfahren, daß die Baugruppe auf der genannten Frittenentglasungstemperatur gehalten wird, bis die Folie (32) zwischen dem Kolbenteil (24) und dem Schirmträger (16) durch entglaste Fritte festgelegt ist, worauf die Baugruppe auf Zimmertemperatur gekühlt und dadurch in der festgelegten Folie (32) eine Zugspannung erzeugt wird, wouf die Folie (32) von dem Träger (30) getrennt wird, um eine Wegnahme des Trägers (30) zu ermöglichen, ein etwa von der Verbindungsstelle zwischen dem Schirmträger und dem Kolbenteil, die durch Fritte dicht miteinander verbunden sind, vorstehender Teil der Folie (32) entfernt wird und etwa freiliegende Ränder der Folie (32) mit Isoliermaterial überzogen werden.
EP84111579A 1983-09-30 1984-09-27 Farbbildkathodenstrahlröhre, Komponente dafür und ihr Herstellungsverfahren Expired - Lifetime EP0211963B1 (de)

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US4776822A (en) * 1987-11-12 1988-10-11 Zenith Electronics Corporation Registration transfer process for use in the manufacture of a tension mask color cathode ray tube
TW385913U (en) * 1996-05-15 2000-03-21 Matsushita Electronics Corp Planar member for shadow mask of cathode-ray tube and manufacturing method of shadow mask
JPH1145664A (ja) * 1997-07-29 1999-02-16 Toshiba Corp カラー受像管

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US3665569A (en) * 1968-12-20 1972-05-30 Sylvania Electric Prod Method and apparatus for fabricating a cathode ray tube envelope having an annular shaped rear window
JPS5640463B2 (de) * 1973-02-14 1981-09-21
US4069567A (en) * 1977-02-28 1978-01-24 Zenith Radio Corporation Method of installing a color selection electrode in a color cathode ray tube
JPS55163745A (en) * 1979-06-07 1980-12-20 Sony Corp Flat panel type color cathode-ray tube

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BR8404926A (pt) 1985-08-20
KR850002662A (ko) 1985-05-15
FI843824L (fi) 1985-03-31
FI843824A0 (fi) 1984-09-28
EP0211963A3 (en) 1987-05-13
FI80967B (fi) 1990-04-30
AR244464A1 (es) 1993-10-29
DE3483048D1 (de) 1990-09-27
MX163469B (es) 1992-05-18
KR920004634B1 (ko) 1992-06-12
EP0211963A2 (de) 1987-03-04
CA1222277A (en) 1987-05-26
SG2291G (en) 1991-04-05
JPS6095834A (ja) 1985-05-29

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