US3873365A - Apparatus for cleaning seal edge regions of cathode ray tube panels - Google Patents

Apparatus for cleaning seal edge regions of cathode ray tube panels Download PDF

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Publication number
US3873365A
US3873365A US343391A US34339173A US3873365A US 3873365 A US3873365 A US 3873365A US 343391 A US343391 A US 343391A US 34339173 A US34339173 A US 34339173A US 3873365 A US3873365 A US 3873365A
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United States
Prior art keywords
panel
container
frame
oriented
solvent
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Expired - Lifetime
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US343391A
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English (en)
Inventor
Joseph J Dapolito
Gustav A Stachelhaus
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GTE Sylvania Inc
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GTE Sylvania Inc
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Priority to US343391A priority Critical patent/US3873365A/en
Priority to DE2413366A priority patent/DE2413366A1/de
Priority to BE2053493A priority patent/BE812606A/fr
Application granted granted Critical
Publication of US3873365A publication Critical patent/US3873365A/en
Assigned to NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. reassignment NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981. (SEE DOCUMENT FOR DETAILS). Assignors: GTE PRODUCTS CORPORATION A DE CORP.
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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

Definitions

  • An apparatus is provided for cleaning extraneous coating material from the seal edge region of a cathode ray tube face panel.
  • the coated panel is horizontally positioned with the sidewall edge thereof oriented in a downward direction over a container of solvent.
  • a shielding member is spatially positioned to protect the viewing area of the panel from subsequent spurious splashings of the solvent.
  • the surface of the solvent is contacted with mesh-like member to break the surface tension thereof in a turbulent-free manner, whereupon, the seal edge is immediately immersed in the solvent to loosen the extraneous edge-oriented coating.
  • the interior of the inverted panel is vented to facilitate the rise of the solvent to the desired level of the interior of the panel sidewall. The panel edge is thence removed and rinsed to remove the loosened coating from the edge region.
  • Color cathode ray tubes such as those employed in television applications often have patterned multiplex screen structures comprising reflective groups of related phosphor elements whereof the interstitial spacing between adjacent pattern elements is covered by an opaque light-absorbing material.
  • each phosphor element is defined by an opaque encompassment, of for example graphite, which collectively comprise a foraminous pattern in the form of a windowed webbing having an array of substantially opaque-connected interstices. While such web-like structures have been fabricated either before or after screening of the phosphor elements, it has been found most expeditious to form the opaque windowdefining-webbing on the panel before deposition of the phosphors.
  • a pattern of clear polymerized polyvinyl alcohol pattern elements is light disposed on the. panel on those areas subsequently to be windows in the opaque webbing, by photo exposure through a related apertured mask member.
  • the resultant island-like polymerized pattern elements are surrounded by bare interstitial areas of glass.
  • the opaque graphite coating is then applied to completely overcoat the interior of the panel covering the clear pattern elements and the adjacent bare interstitial glass areas.
  • an oxidizing agent is applied to completely degrade the polymerized window pattern elements thereby loosening the superjacent opaque coating thereon, whereupon the materials so loosened are removed by a subsequent water development step.
  • an opaque interstitial web of graphite material having multitudinous windows defined as bare glass areas of a size related to the apertures in the pattern mask members. Since the graphite has been previously disposed over the whole of the interior of the panel, it is also residual in the sealing edge region of the panel sidewall. It is essential that this extraneous graphite material be removed from the region of the panel sealing edge to facilitate subsequent hermetic bonding of the panel to the funnel portion of the envelope assembly. Usually, the removal of the graphite from the seal edge region is accomplished either before the oxidizing agent is applied to degrade the polymerized window pattern or immediately following the ensuing development step.
  • an apparatus for cleaning extraneous coating from the seal edge region of a CRT face panel The coated panel is located in a horizontal position with the sidewall edge oriented in a downward direction over a container of liquid solvent solution.
  • a shielding member contoured of a shape similar to that of the panel is positioned to protect the coating disposed on the viewing area, and sidewall portion contiguous thereto, from subsequent possible spurious splashings of the related solvent.
  • the shielding member is spatially related to both the panel and the solvent.
  • the surface of the solvent is contacted with means for breaking the surface tension thereof in a turbulent-free manner; whereupon, the sealing edge of the panel is immediately immersed into the solvent to loosen the bonding of the coating material contacted.
  • the interior of the panel is vented to atmospheric pressure to facilitate the rise of the solvent to the desired level on the interior coated surface of the panel sidewall.
  • the panel edge region is thence removed from the solvent, the withdrawal being consummated in a manner to minimize turbulence of the solvent.
  • the panel is thence rinsed to remove the loosened coating from the edge region.
  • FIG. 1 is an exploded isometric view illustrating constructional details of the cleaning apparatus
  • FIGS. 20, 2b, and 2c are sectional views of the assembled apparatus taken substantially along the line 2-2 of FIG. 1 showing several operational aspects of the apparatus;
  • FIG. 3 is an isometric view of a panel positioning block
  • FIG. 4 is an enlarged sectional view showing a portion of the panel positioning block as taken along the line 4-4 of FIG. 3;
  • FIG. 5 is an enlarged sectional showing the seating of the panel edge in the V of the positioning block as illustrated in FIGS. 2b and 2c;
  • FIG. 6 is a sectional view illustrating the panel rinsing operation following panel cleaning in the apparatus.
  • FIG. 1 there is shown an exploded isometric view of the constructional aspects of the panel cleaning apparatus 11.
  • FIGS. 20, 2b and 2c delineate the relationship of the several components comprising the apparatus assembly and the solvent solution 12 contained therein.
  • An open-top liquid container or tank 13, horizontally oriented and affixally located on a base member 15, is formed of stainless steel or a chemically resistent and substantially rigid plastic material such as P.V.C.
  • the container is constructed to hold a quantity of the liquid solvent solution 12 at a predetermined level as evidenced by the outflow orifice 17.
  • One embodiment of the open top container is shaped as a continuous channel 19 forming a ring-like structure whereof the inner sidewall 21 defines a substantially vertically oriented centralized tubular-like structure 23, the opening providing venting means, the function of which will be described later in this specification.
  • a frame member 27 is constructed of a perimetrical portion 29 with a plurality of spatially related lateral structural elements 31 joined to an annular member 33. This annular member is formed to accommodate vertical movement of the frame 27 relative to the tubular vent 23.
  • the frame is supported by a plurality of spaced apart supportive means 37, each comprising an edgeoriented guide bracket 39 with a bore 41 therein to slidably accommodate a guide rod 43 extended therethrough.
  • Each of the respective guide rods is positioned by a holding means 45 which is attached to the base member exteriorly of the container 13.
  • a resilient element such as a helical spring 47, encompassing each guide rod 43, provides the support for each of the frame guide brackets 39 thereby effecting suspension of the frame member 27 within the container in a manner to facilitate vertical reciprocating movement of the frame therein.
  • At least one multi-apertured or mesh-like member 51 is shaped and laterally positioned on and attached to the frame member in a manner to be vertically movable with the frame.
  • the mesh member which is formed, for example, of stainless steelyhas a cut out portion 53 to facilitate movement thereof relative to the tubular vent 23. This mesh functions as a means for expeditiously breaking the surface tension of the solvent 12 in the container 13 during operation of the apparatus.
  • a plurality of panel positioning blocks 55 Positioned atop the mesh member are a plurality of panel positioning blocks 55 in spaced apart relationship.
  • each of the blocks 55 has at least one locating V configuration 59 formed therein to accommodate portions of the sealing edge 63 of the face panel 65 in a limited contact manner, the perimetrical sealing edge of the panel being positioned within the V to make limited contact with each leg a and b thereof.
  • Such limited contact is important in promoting efficient areal solvent treatment for effecting removal of the extraneous coating from the edge region of the panel.
  • the sealing edge 66 of the locating V is beveled or chamfered along both edges 67.
  • a shielding member 71 of a material such as epoxy, is positioned within the viewing panel 65 to protect the coating, not shown, disposed on the interior surface of the viewing area 73 thereof and on the sidewall portion 75 contiguous thereto.
  • This protective shield while being smaller than the interior dimensions of the panel, is contoured of a shape similar to that of the interior surface of the panel, and is positioned in a manner spatially related to the interior surface of the panel and the adjacent solvent solution 12 in the container 13.
  • the shielding member 71 is spaced above and substantially central to the frame member 27 and suitably affixed thereto by a plurality of supportive brackets 79. Therefore, during operation of the apparatus, the shield and the frame member are moved vertically and simultaneously in a constant spatial relationship, whereof the shielding member is always above the level of the solvent solution 12.
  • the tubular vent construction 23 is oriented to open beneath the shielding member.
  • the tube face panel 65 being of skirted construction has a surrounding sidewall portion perimetrically extending from the periphery of the viewing area 73.
  • the panel is predeterminately positioned in a horizontal inverted manner with the sidewall sealing edge 63 oriented in a downward direction over the shielding member 71.
  • This panel positioning is accomplished. for example, by panel supportive means 81 formed as a vacuum holding arrangement functioning in conjunction with the outer surface of the panel.
  • panel supportive means is adaptive to usage for accurately positioning the panel and sequentially moving the same through a number of related stations in an automated manufacturing operation.
  • the container 13 and associated frame member 27 are positionally related to base member 15 which, in turn, is supported by apparatus support means 85.
  • the panel edge immersion can be accomplished in either of two procedures.
  • the panel 65 is located by support means 81 in a constant position, and the apparatus support means 85 is moved vertically by a controlled reciprocating movement means, not shown, to enable the liquid solution 12 to make contact with the stationary sealing edge region of the panel 65.
  • a controlled reciprocating movement means not shown
  • Such vertical reciprocation is achieved by conventional fluid or mechanical means readily conjunctive with the apparatus support means.
  • Another procedure for effecting the relative movement between the panel and the solvent is to maintain the solvent container 13 at a constant level; whereupon, the panel support means 81 is moved in a predetermined vertical manner by controlled reciprocating means, not shown, to enable the panel edge region to be immersed in and removed from the solvent.
  • controlled reciprocating means not shown
  • a cathode ray tube face panel 65 is, for example, at that stage of screen fabrication wherein the opaque coating material, such as graphite and a binder, has been disposed over the polymerized PVA pattern of window elements.
  • the graphite coating material not shown, covers the whole of the interior of the panel including the sealing edge region from which it is removed by the invention.
  • the panel 65 is placed and held by supportive means 81 in a horizontal position with the sidewall edge 63 oriented in a downward direction over an open-top container 13 having therein a controlled and predetermined level of liquid solvent solution 12.
  • the solvent is substantially a weak acidic solution to soften the bonding of the graphite associated binder.
  • aqueous solution comprising about one percent by volume of hydrofluoric acid and one percent by volume of sulfuric acid has been found satisfactory for the process.
  • the contoured shielding member 71 of the apparatus is spatially and centrally oriented to subsequently protect the graphite coating disposed on the panel viewing area 73 from any spurious splashings of the solvent material.
  • the solvent container is raised toward the panel to effect seating contact therewith in the appropriate V configurations 59 formed in the panel positioning blocks 55.
  • FIGS. 2b the container is further raised, to the full of the upward movement.
  • the helical springs 47 of the frame supportive means are compressed and the frame member 27, which is initially above the solvent level at the beginning of the cycle, is lowered into the solvent 12 carrying with it the mesh-like member 51.
  • vent construction 23 which facilitates the rise of the solvent to the desired level on the interior coated surface of the sidewall.
  • the reverse of the process is initiated for removing the panel from the solvent.
  • the panel emerges from the solvent before the mesh and associated frame member, whereupon the solvent liquid drains from the panel through the mesh member.
  • the panel positioning blocks and the adjacent mesh break the surface tension that holds the solvent solution to the panel sealing edge, thus the mesh prevents the formation of bubbles and resultant surface turbulence as the apparatus returns to the starting position.
  • Minimizing turbulence associated with disruption of the surface tension of the solvent immediately associated with immersion and egression of the panel edge therewith reduces the prevalence of minute splashing of the interior of the panel.
  • the solvent reacts on the bonding of the graphite coating, loosening but not removing it from the seal edge region, therefore, the solvent does not become unduly contaminated with graphite material.
  • the coated panel After the coated panel is subjected to treatment in the solution, it is moved to an adjacent station 89, as indicated in FIG. 6, whereupon the panel is rinsed with water supplied by flow means 91.
  • This rinsing step removes the loosened extraneous graphite coating from the region of the seal edge 63.
  • the edge of each panel is expeditiously cleaned in a repetitive uniform manner.
  • an apparatus for cleaning the coating from substantially the sealing edge region of said panel sidewall comprising:
  • an open-top container oriented beneath said panel supportive means and adapted to contain a quantity of a solvent liquid at a predetermined level therein, said container including at least one sub stantially vertically and centrally oriented tubularlike venting means positioned to extend above said liquid level therein;
  • a frame member formed for suspension within the confines of said container in a manner to effect predetermined and restricted vertical reciprocating movement therein, said frame being constructed of a perimetrical portion having a plurality of spatially related lateral structural elements connective therewith, said frame member having said panel supportive means associated therewith;
  • a mesh-like member positioned laterally on said frame member in a manner to be vertically movable therewith, said mesh-like member being oriented beneath said panel supportive means;
  • a shielding member having an exterior contour related to that effected by the interior surface of said panel, said shielding member being spaced above and affixed to said frame member at a location substantially central thereto in a manner to be vertically movable therewith in the region above the level of said liquid, said venting means opening beneath said shielding member;
  • apparatus support means associated with said container
  • panel positioning means are discretely formed blocks having provisions therein to make contact with selected portions of substantially the sealing edge of said panel to properly position the edgerelated area thereof for cleaning.
  • each of said panel positioning blocks has at least one locating V formed therein to accommodate the sealing edge of the panel in a limited contact manner, the perimetrical sealing edge of said panel being positioned within the V to make contact with each leg thereof.
  • said open-top container is shaped as a continuous liquid-containing channel forming a ring-like structure whereof the inner sidewall defines a substantially vertically oriented centralized tubular-like strucframe having a plurality of edge-oriented guide brackets each with a bore therethrough to match a respective guide rod thereby facilitating reciprocating movement of said frame.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US343391A 1973-03-21 1973-03-21 Apparatus for cleaning seal edge regions of cathode ray tube panels Expired - Lifetime US3873365A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US343391A US3873365A (en) 1973-03-21 1973-03-21 Apparatus for cleaning seal edge regions of cathode ray tube panels
DE2413366A DE2413366A1 (de) 1973-03-21 1974-03-20 Verfahren zum reinigen eines bereiches des bildschirmteiles von kathodenstrahlroehren
BE2053493A BE812606A (fr) 1973-03-21 1974-03-21 Procede et appareil pour le nettoyage des panneaux des tubes a rayons cathodiques

Applications Claiming Priority (1)

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US343391A US3873365A (en) 1973-03-21 1973-03-21 Apparatus for cleaning seal edge regions of cathode ray tube panels

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US3873365A true US3873365A (en) 1975-03-25

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BE (1) BE812606A (fr)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5728229A (en) * 1995-05-04 1998-03-17 Newbridge Networks Corporation Test probe cleaner
DE19638951A1 (de) * 1996-09-16 1998-03-26 Samsung Elektronische Baueleme Verfahren und Vorrichtung zur Optimierung der Leuchtstoffbeschichtung bei der Bildröhrenproduktion
US5778912A (en) * 1996-07-30 1998-07-14 Samsung Display Devices Co., Ltd. Panel washing device for cathode ray tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351265A (en) * 1981-02-19 1982-09-28 Rca Corporation System for applying a liquid to the studs of a color kinescope faceplate panel
FR2583218B1 (fr) * 1985-06-11 1987-08-07 Videocolor Procede de detection de defauts lors de la fabrication de l'ecran d'un tube de television en couleurs

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US970872A (en) * 1910-07-11 1910-09-20 Annie Babcock Dish-washing apparatus.
US2763276A (en) * 1955-07-06 1956-09-18 George D Irwin Washing apparatus
US2827390A (en) * 1955-02-14 1958-03-18 Thomas Electronics Inc Production of kinescope targets
US2992107A (en) * 1954-10-19 1961-07-11 Zenith Radio Corp Method of manufacturing luminescent screens
US3326224A (en) * 1965-09-29 1967-06-20 Sylvania Electric Prod Coating removal device
US3376153A (en) * 1964-10-20 1968-04-02 Rauland Corp Method of coating cathode-ray tubes
US3746020A (en) * 1972-03-03 1973-07-17 Zenith Radio Corp Sealing land cleaning machine
US3759735A (en) * 1970-09-11 1973-09-18 Zenith Radio Corp Panel method for cleaning the sealing land of a cathode ray tube faceplate

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US970872A (en) * 1910-07-11 1910-09-20 Annie Babcock Dish-washing apparatus.
US2992107A (en) * 1954-10-19 1961-07-11 Zenith Radio Corp Method of manufacturing luminescent screens
US2827390A (en) * 1955-02-14 1958-03-18 Thomas Electronics Inc Production of kinescope targets
US2763276A (en) * 1955-07-06 1956-09-18 George D Irwin Washing apparatus
US3376153A (en) * 1964-10-20 1968-04-02 Rauland Corp Method of coating cathode-ray tubes
US3326224A (en) * 1965-09-29 1967-06-20 Sylvania Electric Prod Coating removal device
US3759735A (en) * 1970-09-11 1973-09-18 Zenith Radio Corp Panel method for cleaning the sealing land of a cathode ray tube faceplate
US3746020A (en) * 1972-03-03 1973-07-17 Zenith Radio Corp Sealing land cleaning machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5728229A (en) * 1995-05-04 1998-03-17 Newbridge Networks Corporation Test probe cleaner
US5778912A (en) * 1996-07-30 1998-07-14 Samsung Display Devices Co., Ltd. Panel washing device for cathode ray tube
DE19638951A1 (de) * 1996-09-16 1998-03-26 Samsung Elektronische Baueleme Verfahren und Vorrichtung zur Optimierung der Leuchtstoffbeschichtung bei der Bildröhrenproduktion
DE19638951B4 (de) * 1996-09-16 2006-04-20 Samsung Sdi Germany Gmbh Verfahren und Vorrichtung zur Optimierung der Leuchtstoffbeschichtung bei der Bildröhrenproduktion

Also Published As

Publication number Publication date
DE2413366A1 (de) 1974-09-26
BE812606A (fr) 1974-09-23

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AS Assignment

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.,

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708