US2275864A - Cathode ray tube - Google Patents

Cathode ray tube Download PDF

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Publication number
US2275864A
US2275864A US367385A US36738540A US2275864A US 2275864 A US2275864 A US 2275864A US 367385 A US367385 A US 367385A US 36738540 A US36738540 A US 36738540A US 2275864 A US2275864 A US 2275864A
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US
United States
Prior art keywords
envelope
tube
gettering
metal
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
US367385A
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English (en)
Inventor
Le Roy E Record
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.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US367385A priority Critical patent/US2275864A/en
Priority to FR877309D priority patent/FR877309A/fr
Application granted granted Critical
Publication of US2275864A publication Critical patent/US2275864A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • H01J7/186—Getter supports
    • 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
    • H01J29/94—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/929—Electrical contact feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49885—Assembling or joining with coating before or during assembling

Definitions

  • the present invention relates to cathode ray tubes, such as picture reproducing tubes for use in television receiving apparatus.
  • An important feature of the invention consists in the use of a tube envelope which comprises a bulbous portion having a relatively large opening and a flanged shaft portion sealed into this opening by means of a fusion seal,
  • a gettering assembly larger than is usually employed in tubes of the type under consideration, is introduced into the bulbous portion of the envelope through the abovementioned opening prior to or concurrently with the closing of the opening by the incorporation of the shaft portion of the envelope.
  • the construction described above also leads to an improved procedure for providing the interior wall surfaces of the tube envelope with a continuous conductive coating, as is required for most satisfactory operation of the tube.
  • the two envelope parts are preferably separately coated internally prior to their assembly, and the two coatings are electrically joined after the tube is assembled by means of metal vapor generated from the gettering means. This procedure eliminates certain difliculties encountered when it is attempted to form the conductive coating as a whole after the tube envelope has been completely assembled.
  • Fig. 1 represents a cathode ray tube suitably embodying the invention
  • Fig. 2 represents an intermediate stage in the fabrication of a cathode ray tube according to the invention
  • Fig. 3 is an enlarged perspective view showing the details of the gettering means used in the device of Fig. 1
  • Fig. 4 represents a further stage in tube fabrication
  • Fig. 5 is an enlarged fragmentary detail view of one element of the gettering means shown in Fig. 2; Fig.
  • Fig. 6 is a fragmentary sectional view useful in explaining the nature and effect of the gettering operation
  • Fig. 7 is an enlarged view showing the manner in which the anode terminal connection of the tube of Fig. 1 may be used as an evacuating duct during the exhaust operation
  • Fig. 8 shows an alternative type of getter with which the invention may be practiced
  • Fig. 9 shows an alternative way of mounting the gettering means.
  • Fig. 1 there is shown a completely assembled cathode ray tube of the type used in television for picture reproduction purposes.
  • the envelope of this tube comprises an enlarged bulbous part II) of glass and an elongated glass shaft portion II connected therewith.
  • the bulbous portion is provided with a flattened wall lOa which is assumed to be coated internally with a material adapted to luminesce upon the impingement of an electron beam.
  • the shaft portion I I which contains electrode structure for producing an electron beam, terminates in an outwardly extending flange lla which is fusion sealed at its periphery to a tubular extension of the bulbous part of the envelope.
  • the electrode structure within the envelope shaft portion ll comprises a cathode M which is shown in dotted outline and an apertured control electrode l5, commonly called a grid.
  • the cathode acts as the source of an electron stream which may be modulated (i. e. varied in intensity) by the action of the control electrode l5.
  • the control electrode is ordinarily biased to a negative potential and is connected to a source of signal voltage (not shown).
  • the electrodes 14 and I5 are both mounted on a common stem press l1 and connect with bayonet terminals l8 which project from the extremity of the tube.
  • a basing cap is which is cemented to the tube serves to support the terminals l8 in rigid fashion.
  • Both the bulbous and shaft portions of the envelope are provided internally with conductive coatings (respectively indicated at Zla and 2th) which in the normal operation of the tube are to be maintained at a common potential.
  • These coatings should be constituted of a conductive substance such as a thin layer of metal or a layer of graphite deposited in a suitable manner. If graphite is used, one may employ, for example,
  • the shaft coating Zlb terminates at a point which is in close proximity to the extremity of the grid l5 and, when connected to a source of high potential, serves as an anode for accelerating and to some extent for focusing the electron stream delivered by the cathode.
  • the beam of electrons thus formed may be additionally focused by magnetic means and may be caused to move transversely so as to scan the surface of the envelope window llla by the action of appropriate deflecting means. (Since the focusing and deflecting means form no part of my present invention. they are not shown in the drawing).
  • the tube envelope is formed by the junction of two parts, of which one comprises a bulbous portion corresponding to the part Ill as the same is shown in Fig. 1, but having a tubular extension lOb of the character indicated in Fig. 2.
  • the other part of the envelope is the flanged shaft portion I l (Figs. 1 and 2).
  • each part Prior to joining the parts It) and II, each part is preferably provided internally with a conductive coating (i. e. the coatings 2 la and 2 lb) Due to the ready accessibility of the interior surfaces of the respective parts, these coatings may be easily applied by a brushing technique or by temporarily introducing a liquid suspension of coating material into the part to be coated to cause deposition of the coating material on the appropriate surfaces.
  • a conductive coating i. e. the coatings 2 la and 2 lb
  • a gettering assembly is mounted on the shaft flange Ila.
  • This assembly which may be of the nature illustrated in Fig. 3, comprises the combination of a gettering ring 24 and a flared or frustro-conical shield 26, preferably of metal (e. g. nickel), to which the gettering ring is at- These wires should preferably support the shield 26 in spaced relation with respect to the flange so that subsequent heating of the shield will have no tendency to crack the glass of which the flange is constituted.
  • the flanged portion of the envelope shaft is introduced into the tubular part l?) of the bulbous envelope portion as illustrated in Fig. 2. Thereafter, heat is applied to the outer surfaces of the part lllb so that it contracts into sealing contact with the periphery of the flange. The excess of glass depending below the flange is then dropped on and the seal is brought to the finished condition indicated in Fig. 4, The stem press I! bearing the electrodes l4 and I5 may then be sealed in place and the tube baked out and exhausted.
  • the gettering ring which is shown in enlarged section in Fig. 5, preferably comprises an annular metal tube consisting, for example, of nickel or copper.
  • This tube may be filled with a chemically active, readily vaporizable metal 25 such as barium or magnesium which in its vapor state is capable of cleaning up objectionable gases apt to be present within the tube envelope in the final stages of the exhaust procedure.
  • a thin portion 240. provided in the wall of the annular tube 24 permits the tube to be readily ruptured so as to facilitate the escape of the vaporizable material 25.
  • Heating of the gettering assembly may be readily accomplished by inductive means because of the loop form of the assembly; that is to say, a high frequency field produced in the vicinity of the gettering assembly can induce currents in the shield 26 and also in the gettering ring 24 sufficient to heat the same above the vaporizing temperature of the metal 25, thus causing the metal to be released.
  • the form of the shield 26 causes the vaporized metal to be projected almost exclusively against the portion of the envelope wall corresponding to the uncoated gap 30 so that the metal as it condenses forms a conductive bridge between the coatings 2la and 2 lb as indicated at 3
  • the arrangement of Fig. 1 permits a more adequate amount of gettering material to be used than is practicable when the source of such material is located in the tube shaft.
  • the relatively large dimensions of the space within which the gettering element is positioned and the fact that it is wholly remote from the electron beam path eliminate any need for limitation of its size for reasons of space economy.
  • the advantageous location of the gettering ring means that an increase in its size does not materially increase the danger of short-circuiting the electrode parts when the gettering metal is vaporized.
  • the terminal which in th finished tube affords a means of connecting the conductive coating within the tube envelope to an external source of high potential may be initially of the character shown in Fig. 7.
  • the terminal comprises a flanged eyelet which is constituted of a chrome-iron alloy orof some other alloy readily sealed to glass.
  • the eyelet has an aperture 34 atone end and may be used for the evacuating function by fusing its extremity to a glass tubulation 35 which is connected to a vacuum pump (not shown). After the envelope has.
  • the tubulation 35 is pinched oil and fused down so that it completely fills the aperture 34, thus leaving the tube in sealed condition.
  • a connection between the eyelet 33 and the internal conductive coating is provided simplyby forming the internal coating Zia in such fashion that it extends over the eyelet flange as indicated at 31.
  • gettering capsules such as the capsules 39 and 40 illustrated in Fig. 8. These may be supported by means of a'conductive ring 4
  • Fig. 9 represents, an alternative method of mounting the gettering assembly.
  • the mounting means comprises a plurality of wires bent in the manner exemplified by the wire 43.
  • the extremity of this wire is provided with a hook-like portion 44 of which the tip is embedded in the joint between the glass flange Ila and the tubular envelopeepart lllb at the time the seal between these parts is formed.
  • a cathode ray tube having electrode structure for generating electrons, a terminally flanged insulating cylinder deflning an. elongated passage for the electrons, a bulbous envelope having an opening in which the cylinder flange is sealed by means of a fusionseal, and a gettering assembly within the bulbous portion of the envelope and arranged to assure the deposition of vaporized the fusion seal.
  • a cathode ray tube having electrode structure for generating electrons, a terminally flanged insulating cylinder defining an elongated passage for the electrons, a bulbous envelope having a tubular extension to which the cylin- 'said tubular extension and by the said flange.
  • -A cathode ray tube having electrode structure for gettering electrons, a terminally flanged insulating cylinder defining an elongated passage fortheFelectrons, a bulbous envelope having an opening in which the cylinder flange is sealed by means of a peripheral fusion seal, and a getterin'g assembly of annular configuration supported within the envelope in proximity tothe said flange, the said gettering assembly being so
  • the production of the luminescent coating which is applied to the interior of the tube window Illa and the formation of the internal conductive coating Ma may obviously be accomplished with ease through the relatively large opening which exists in the bulb before the shaft portion I l is joined to it.
  • a cathode ray tube having electrode structure for generating electrons, a terminally flanged insulating cylinderdefining an elongated passage for the electrons, a bulbous envelope having an opening in which the cylinder flange is sealed by means of a peripheral fusion seal, and a gettering assembly supported within the envelope in proximity 'to the said flange, the said gettering assembly 'comprising a gettering ring coaxial with the said cylinder and anannular shield for confining metal vaporized from said ring to the region. of the fusion seal.
  • a cathode ray tube having electrode structure for generating electrons, an insulating cylinder defining an elongatedpassage for the electrons, a bulbousenvelope joined to the-extremity of the said cylinder by a fusion seal, separate conductivecoatings respectively applied to the interior surfaces of the said cylinder and envelope for fixing the potential thereof, there being a gap between the said coating at the region' of the seal between the cylinder and envelope, a layer of vaporizable metal conductively bridging the said gap, and means positioned in proximity,
  • a cathode ray tube having electrode structure for generating electrons, an insulating cylinder defining an elongated passage for the electrons, a bulbous'envelope joined to the extremity of the said cylinder by a fusion seal, separate conductive coatings respectively applied to the interior surfaces of the said cylinder and en-- velope for fixing the potential thereof, therebeing a gap betweenthe said coatings in the re- 3 gion of the seal between the cylinder and envelope, a layer of chemically active vaporizable metal conductively bridging the said gap, means positioned in proximity to the said gap and serving during the fabrication of the tube as a source. of vaporization of the said vaporizable metal, and
  • a cathode ray tube having etectrode struc- .ture for generating electrons, an insulating cylinder defining an elongated passage for the electrons, a bulbous envelope joined to the extremity of the said cylinder by a fusion seal, separate conductive coatings respectively applied to the interior surfaces of the said cylinder and envelope for fixing the potential thereof; there being an annular gap between the said coatings at thereigon of the seal between the cylinder and envelope, a layer of chemically active vaporizable metal bridging the said gap, and a gettering ring conforming approximately to the said gap and positioned in proximity thereto, said gettering ring servingduring the fabrication of the tube as a source from which the said layer of vaporizable material may be deposited, and shielding means associated with the said gettering ring for confining
  • a cathode ray tube having electrode structure for generating electrons, an insulating cylinder defining an elongated passage for the electrons and terminating in an outwardly extending fiange, a bulbous envelope merging into a tubular part which-is'joined to the periphery of the said flange by a fusion seal, separate conductive coatings respectively applied 'to the interior surfaces of the said cylinder and envelope/for fixing the aforementioned means for confining the deposition of metal vaporized from such means substantially to the region of the said gap.
  • a discharge tube of the type which in finished form includes an assembly of two major glass envelope parts having a conductive sheath extending continuously over the interior surfaces of the said two parts,

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  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US367385A 1940-11-27 1940-11-27 Cathode ray tube Expired - Lifetime US2275864A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US367385A US2275864A (en) 1940-11-27 1940-11-27 Cathode ray tube
FR877309D FR877309A (fr) 1940-11-27 1941-11-27 Perfectionnements aux tubes à rayons cathodiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US367385A US2275864A (en) 1940-11-27 1940-11-27 Cathode ray tube

Publications (1)

Publication Number Publication Date
US2275864A true US2275864A (en) 1942-03-10

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FR (1) FR877309A (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460608A (en) * 1945-01-12 1949-02-01 Rauland Corp Cathode-ray tube
US2486436A (en) * 1946-05-10 1949-11-01 Rothstein Jerome Contamination control
US2502070A (en) * 1949-01-19 1950-03-28 Dunlee Corp Getter for induction flashing
US2658160A (en) * 1951-11-23 1953-11-03 Rauland Corp Image-reproducing device
US2704169A (en) * 1951-05-17 1955-03-15 Philco Corp Electronic tube
US2799123A (en) * 1949-12-01 1957-07-16 Philips Corp Method of manufacturing cathode ray tube
US2829292A (en) * 1955-07-04 1958-04-01 Cinema Television Ltd Cathode-ray tubes
US2838708A (en) * 1954-06-09 1958-06-10 Gen Electric Electron discharge device and method of gettering
US2871087A (en) * 1956-02-10 1959-01-27 Westinghouse Electric Corp Method of assembling a color television tube
US2933633A (en) * 1955-02-16 1960-04-19 Gen Electric Electric discharge device
US3149716A (en) * 1959-09-29 1964-09-22 Dick Co Ab Evaporator vacuum pump
US3254216A (en) * 1961-10-02 1966-05-31 Owens Illinois Glass Co Method of evaluating gettering techniques
US3300037A (en) * 1961-07-07 1967-01-24 Gen Electric Rupturable containers
US3381805A (en) * 1966-07-08 1968-05-07 Getters Spa Getter assembly having support of low thermal conductivity
US3719433A (en) * 1970-04-21 1973-03-06 Getters Spa Getter device
US4143294A (en) * 1976-07-26 1979-03-06 Zenith Radio Corporation Getter support means for television cathode ray tubes
US4333031A (en) * 1979-03-30 1982-06-01 Rca Corporation Photomultiplier tube having directional alkali metal vapor evaporation means
DE3143633A1 (de) * 1980-11-10 1982-07-15 Naamloze Vennootschap Philips' Gloeilampenfabrieken, 5621 Eindhoven Kathodenstrahlroehre
US6040656A (en) * 1997-07-25 2000-03-21 Samsung Display Devices Co., Ltd. Getter flashing method for cathode ray tube and getter for conducting same
US20070096649A1 (en) * 2005-10-28 2007-05-03 Roels Timothy J Electrode-mounted getter

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460608A (en) * 1945-01-12 1949-02-01 Rauland Corp Cathode-ray tube
US2486436A (en) * 1946-05-10 1949-11-01 Rothstein Jerome Contamination control
US2502070A (en) * 1949-01-19 1950-03-28 Dunlee Corp Getter for induction flashing
US2799123A (en) * 1949-12-01 1957-07-16 Philips Corp Method of manufacturing cathode ray tube
US2704169A (en) * 1951-05-17 1955-03-15 Philco Corp Electronic tube
US2658160A (en) * 1951-11-23 1953-11-03 Rauland Corp Image-reproducing device
US2838708A (en) * 1954-06-09 1958-06-10 Gen Electric Electron discharge device and method of gettering
US2933633A (en) * 1955-02-16 1960-04-19 Gen Electric Electric discharge device
US2829292A (en) * 1955-07-04 1958-04-01 Cinema Television Ltd Cathode-ray tubes
US2871087A (en) * 1956-02-10 1959-01-27 Westinghouse Electric Corp Method of assembling a color television tube
US3149716A (en) * 1959-09-29 1964-09-22 Dick Co Ab Evaporator vacuum pump
US3300037A (en) * 1961-07-07 1967-01-24 Gen Electric Rupturable containers
US3254216A (en) * 1961-10-02 1966-05-31 Owens Illinois Glass Co Method of evaluating gettering techniques
US3381805A (en) * 1966-07-08 1968-05-07 Getters Spa Getter assembly having support of low thermal conductivity
US3719433A (en) * 1970-04-21 1973-03-06 Getters Spa Getter device
US4143294A (en) * 1976-07-26 1979-03-06 Zenith Radio Corporation Getter support means for television cathode ray tubes
US4333031A (en) * 1979-03-30 1982-06-01 Rca Corporation Photomultiplier tube having directional alkali metal vapor evaporation means
DE3143633A1 (de) * 1980-11-10 1982-07-15 Naamloze Vennootschap Philips' Gloeilampenfabrieken, 5621 Eindhoven Kathodenstrahlroehre
US6040656A (en) * 1997-07-25 2000-03-21 Samsung Display Devices Co., Ltd. Getter flashing method for cathode ray tube and getter for conducting same
US20070096649A1 (en) * 2005-10-28 2007-05-03 Roels Timothy J Electrode-mounted getter

Also Published As

Publication number Publication date
FR877309A (fr) 1942-12-03

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