US3310194A - Cathode ray tube envelope - Google Patents

Cathode ray tube envelope Download PDF

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Publication number
US3310194A
US3310194A US189607A US18960762A US3310194A US 3310194 A US3310194 A US 3310194A US 189607 A US189607 A US 189607A US 18960762 A US18960762 A US 18960762A US 3310194 A US3310194 A US 3310194A
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US
United States
Prior art keywords
envelope
tube
glass
band
cathode ray
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
US189607A
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English (en)
Inventor
Georges M Bradu
Pierre F Grosborne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe des Verreries Industrielles Reunies du Loing
Original Assignee
Loing Verreries
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Filing date
Publication date
Priority claimed from FR860243A external-priority patent/FR1295558A/fr
Priority claimed from FR871214A external-priority patent/FR80244E/fr
Application filed by Loing Verreries filed Critical Loing Verreries
Application granted granted Critical
Publication of US3310194A publication Critical patent/US3310194A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers

Definitions

  • the present invention relates to improvements in electron tubes of the cathode ray type such as the familiar television picture tube. It is particularly concerned with tubes embodying a glass envelope and with a method of protecting such tubes against implosion.
  • a television tube envelope is normally composed of a screen portion, a funnel portion and a neck portion.
  • the screen portion is 'a relatively fiat panel having a depending skirt to which is sealed the funnel portion, a hollow, open-ended glass body of generally conical shape.
  • the complete tubes additionally include a neck portion, various internal components, and an electron gun mounted and sealed in the neck portion of the tube.
  • the envelope parts are customarily sealed together to provide a complete envelope. Thereafter, the required internal components are provided, the tube envelope is baked out under vacuum and is then sealed off to produce a completed tube.
  • our invention resides in an improved cathode ray tube comprising a glass envelope composed of a viewing screen portion and a funnel portion of generally conical shape, wherein the improvement consists in a rigid band encircling the envelope.
  • this band may comprise a shell of rigid material spaced from the envelope wall and an intermediate layer of a settable material provide between the spaced shell and the glass surface, the composite band extending from a plane passing through the viewing screen periphery to a plane adjacent the larger end of the funnel. It further resides in a method of protecting such a tube against implosion, by applying and setting or molding such a rigid band over the defined zone of the tube envelope.
  • FIGS. 1 and 2 are side views in axial section schematically showing a television tube in accordance with the invention
  • FIGS. 3, 4 and 5 illustrate, in schematic section, steps in a method of producing a banded tube such as that of FIG. 2, and
  • FIG. 6 illustrates schematically the method and apparatus employed in a continuous commercial practice of the method illustrated in FIGS. 35.
  • a rigid metal band has been mounted directly on the envelope surface in such manner that the banded zone of the envelope and adjacent areas are placed under compression.
  • composite band 16 may be formed from a spaced shell and a settable material applied directly to the desired zone of the tube envelope.
  • an accidental mechanical or thermal shock at any point on the tube surface, or a continuous strain, or, in general, any phenomenon that may provoke an implosion in an unprotected tube, does not lead to an implosion, that is a violent rupture with projection of glass splinters.
  • progression of a crack in the glass, resulting from accidental shock or continuous strain is slowed up by the band in a manner that assures, without implosion, the establishment of equilibrium pressure between the exterior and interior of the tube.
  • a rigid band in accordance with our invention, constrains the envelope periphery and absorbs the energy that otherwise is released by high speed crack propagation. This in turn slows down the crack propagation sufliciently to permit establishment of pressure equilibrium without violent collapse of the envelope, that is an implosion.
  • annular shell 17 (FIG. 1) a slight distance from the envelope wall.
  • a moldable sealing material 18 that sets to a rigid state or form, and conforms to the glass wall as it sets. While compression is unnecessary, it may, if desired, be provided by using, as sealing material 18, a material that expands or swells as it sets.
  • various materials known in the art such as, metal alloys capable of expanding during their passage from the liquid state to the solid state and being non-compressible in the solid state such as lead-bismuth alloys of low melting points (120 to 130 C.). Such alloys expand during cooling.
  • the composite band may be formed on the envelope either prior to or subsequent to its evacuation.
  • Sealing material 18 may, for example, be any thermal setting organic or inorganic sealing materials or mixtures. The essential requirement is that it sets to a rigid state in conformity with the glass surface, thus assuring substantially continuous contact with the envelope wall.
  • FIG. 2 In order to simplify molding, it is convenient to use a modified form of molding shell 21 as shown in FIG. 2.
  • This shell is originally composed of two annular sections, 22 and 23, adapted to have meeting surfaces along which they are united to form a single encircling shell 21.
  • the two annular sections may be composed of metal and may be produced either by stamping or by casting. In the prior instance, it is convenient to unite the sections by mechanical clamping, pinching, or welding. Cast sections may likewise be united by welding or soldering, or by means of screws or bolts.
  • a molding shell formed in this manner has the further advantage that it provides a flange section of utility in mounting the tube in a cabinet or other viewing set.
  • FIGURES 3-5 illustrate, largely schematically, the detailed steps of a particularly convenient method of practicing this preferred embodiment of the invention.
  • a pair of annular shell-like members are assembled slightly spaced from the tube wall.
  • the intervening space is filled with a material which sets or rigidifies in conformity with the tube wall surface.
  • a support member 50 is provided with centering fingers 52, usually four in number.
  • a preformed annular flanged ring 54 hereafter designated the screen ring, is mounted on centering fingers 52, conveniently by means of holes punched in the flange.
  • tube 56 is vertically mounted on ring 54 with the inner edge of ring 54 coinciding with the periphery of the viewing surface of the tube screen.
  • a sealing ring 58 is also provided intermediate the tube 56 and ring 54.
  • a corresponding funnel ring member 60 adapted to function with ring 54 in providing a containing shell for the rigid banding material, is mounted on centering fingers 52.
  • the flanges of rings 54 and 60 may then be united, preferably by electrical welding to form a single annular shell.
  • This composite shell is then drawn tightly against the lower face of the tube 56, for example by applying pressure intermediate the funnel wall and the upper wall of the composite shell. This may be accomplished, as shown in FIGURE 4, by screws 62 introduced through the upper portion of the shell and bearing against the funnel wall.
  • the rings 54 and 60 forming the composite shell may be of metal, metal alloys, glass, a resin-glass fiber mixture, or any material of such a nature as to present suitable mechanical characteristics, especially from the viewpoint of rigidity.
  • the material intended to assure the filling between the shells and the tube may be composed of sulfur, thermosetting resins, a composite glass-resin cement, etc.
  • a condition that the material must fulfill is that it provide a rigid molded band after casting and setting.
  • the apparatus represented schematically in FIG. 6 provides for continuous practice of this method with the aid of several positions, for example six, references A, B, C, D, E, F, arranged on a table M.
  • This installation includes a conveyor 70 passing through a preheating tunnel 72 (at about 6080 C.) which prepares the rings 54 and 60 and a conveyor 74 passing likewise through a preheating tunnel 76 (at about 60-80 C.) that likewise prepares the tubes 56.
  • the table M includes suitable means (not shown) to provide for rotation of the support members and the supported tubes for sulfur casting. Also suitably controlled activating and stop means are providde permitting control of rotation.
  • the tubes and the shells preheated at about 60-80 C., thereafter undergo the various operations set forth below.
  • the invention has utility not only in television cathode ray tubes but in all other types of cathode ray tubes wherein the envelope is composed of a screen and a cone sealed together, for example, in radar and oscilloscope tubes.
  • a cathode ray tube comprising a glass envelope composed of a viewing screen portion and a funnel portion of generally conical shape
  • the improvement that consists in a band encircling the envelope and extending from a plane passing through the viewing screen periphery to a plane adjacent the larger end of the funnel, the encircling band comprising a metal outer shell member having an inner surface spaced from the envelope and a congealed sulphur sealing material filling the space be tween the envelope and the inner surface of said shell member.
  • a cathode ray tube comprising a glass envelope composed of a viewing screen portion and a funnel portion of generally conical shape
  • the improvement that consists in a band encircling the envelope and extending from a plane passing through the viewing screen periphcry to a plane adjacent the larger end of the funnel, the
  • encircling band comprising a substantially rigid outer References Cited by the Examiner UNITED STATES PATENTS 305,817 9/1884 Hickman et al. 220-23 XR 2,756,892 7/1956 Bleuze et al. 220-2.1 2,785,820 3/1957 Vincent et a1 220-2.1 2,972,783 2/1961 Russell et al. 18-59 3,007,833 11/1961 Jaokman 1859 3,166,211 1/1965 Stel et al. 2202.1 3,260,397 7/1966 De Gier et a1 2202.1

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US189607A 1961-04-28 1962-04-23 Cathode ray tube envelope Expired - Lifetime US3310194A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR860243A FR1295558A (fr) 1961-04-28 1961-04-28 Perfectionnement aux tubes de télévision
FR871214A FR80244E (fr) 1961-08-21 1961-08-21 Perfectionnement aux tubes de télévision

Publications (1)

Publication Number Publication Date
US3310194A true US3310194A (en) 1967-03-21

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US189607A Expired - Lifetime US3310194A (en) 1961-04-28 1962-04-23 Cathode ray tube envelope

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US (1) US3310194A (enrdf_load_html_response)
AT (1) AT254957B (enrdf_load_html_response)
DE (2) DE1855480U (enrdf_load_html_response)
DK (1) DK124845B (enrdf_load_html_response)
ES (1) ES271981A1 (enrdf_load_html_response)
GB (3) GB1002156A (enrdf_load_html_response)
NL (2) NL277657A (enrdf_load_html_response)
OA (1) OA01206A (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340358A (en) * 1962-01-29 1967-09-05 Philips Corp Cathode-ray tube
US3412203A (en) * 1965-08-16 1968-11-19 Mercury Aircraft Inc Tv picture tube and mounting frame assembly
US3485407A (en) * 1965-11-10 1969-12-23 Matsushita Electronics Corp Reinforced type cathode ray tube
US3541251A (en) * 1967-09-19 1970-11-17 Standard Elektrik Lorenz Ag Implosion-protecting frame for television picture tubes and process for its installation
US5565934A (en) * 1992-02-05 1996-10-15 Digital Equipment Corporation Molded video display screen bezel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL131438C (enrdf_load_html_response) * 1962-03-19
DE1221365B (de) * 1963-02-02 1966-07-21 Telefunken Patent Kathodenstrahlroehre mit Implosionsschutz
BE638827A (enrdf_load_html_response) * 1962-10-19
DE1276220B (de) * 1963-07-27 1968-08-29 Telefunken Patent Verfahren zur Herstellung einer Kathodenstrahlroehre mit Frontplatte und Implosionsschutzrahmen
NL154864B (nl) * 1968-04-13 1977-10-17 Philips Nv Werkwijze voor het aanbrengen van een implosiebeveiligingsband om de ballon van een televisiebeeldbuis en een door middel van deze werkwijze vervaardigde televisiebeeldbuis.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US305817A (en) * 1884-09-30 Seph p
US2756892A (en) * 1956-07-31 Bleuze efal
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes
US2972783A (en) * 1957-12-02 1961-02-28 Kimble Glass Co Method for fabricating glass block panels
US3007833A (en) * 1958-12-29 1961-11-07 Dow Chemical Co Method of lamination
US3166211A (en) * 1960-11-03 1965-01-19 Philips Corp Glass cathode ray tube for reproducing images
US3260397A (en) * 1961-02-24 1966-07-12 Philips Corp Cathode ray tube and method of making same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047020A (en) * 1932-07-01 1936-07-07 Rca Corp Television device
US2874017A (en) * 1956-11-07 1959-02-17 Owens Illinois Glass Co Prevention of fracture in glass cathode-ray tubes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US305817A (en) * 1884-09-30 Seph p
US2756892A (en) * 1956-07-31 Bleuze efal
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes
US2972783A (en) * 1957-12-02 1961-02-28 Kimble Glass Co Method for fabricating glass block panels
US3007833A (en) * 1958-12-29 1961-11-07 Dow Chemical Co Method of lamination
US3166211A (en) * 1960-11-03 1965-01-19 Philips Corp Glass cathode ray tube for reproducing images
US3260397A (en) * 1961-02-24 1966-07-12 Philips Corp Cathode ray tube and method of making same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340358A (en) * 1962-01-29 1967-09-05 Philips Corp Cathode-ray tube
US3412203A (en) * 1965-08-16 1968-11-19 Mercury Aircraft Inc Tv picture tube and mounting frame assembly
US3485407A (en) * 1965-11-10 1969-12-23 Matsushita Electronics Corp Reinforced type cathode ray tube
US3541251A (en) * 1967-09-19 1970-11-17 Standard Elektrik Lorenz Ag Implosion-protecting frame for television picture tubes and process for its installation
US5565934A (en) * 1992-02-05 1996-10-15 Digital Equipment Corporation Molded video display screen bezel

Also Published As

Publication number Publication date
DK124845B (da) 1972-11-27
AT254957B (de) 1967-06-12
GB999427A (en) 1965-07-28
NL126725C (enrdf_load_html_response)
ES271981A1 (es) 1962-06-01
DE1171092B (de) 1964-05-27
DE1439118A1 (de) 1968-10-17
GB998486A (en) 1965-07-14
DE1855480U (de) 1962-07-26
NL277657A (enrdf_load_html_response)
DE1439118B2 (de) 1973-02-08
GB1002156A (en) 1965-08-25
OA01206A (fr) 1969-01-25

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