US3912851A - Electric discharge tube and method of manufacturing same - Google Patents

Electric discharge tube and method of manufacturing same Download PDF

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Publication number
US3912851A
US3912851A US468184A US46818474A US3912851A US 3912851 A US3912851 A US 3912851A US 468184 A US468184 A US 468184A US 46818474 A US46818474 A US 46818474A US 3912851 A US3912851 A US 3912851A
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US
United States
Prior art keywords
indium
electric discharge
containing material
tube
discharge tube
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
US468184A
Other languages
English (en)
Inventor
Gerardus Arnoldus Her Vrijssen
Jacobus Stoffels
Johannes Hendrikus Coppens
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.)
US Philips Corp
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3912851A publication Critical patent/US3912851A/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
    • H01J29/92—Means forming part of the tube for the purpose of providing electrical connection to it
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/04—Joining glass to metal by means of an interlayer
    • C03C27/042—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts
    • C03C27/046—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts of metals, metal oxides or metal salts only
    • 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
    • H01J29/025—Mounting or supporting arrangements for grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0038—Direct connection between two insulating elements, in particular via glass material

Definitions

  • the invention relates to an electric discharge tube comprising a vacuum-tight envelope, at least one electrically conductive leadthrough provided in said envelope and an electrode which is electrically conductively connected to .said leadthrough, said leadthrough consisting of an aperture provided in the envelope and sealed in a vacuum-tight manner by means of an indium-containing material.
  • the invention furthermore relates to a method of connecting and electrically leading-out an electrode in such a discharge tube.
  • Such a discharge tube is known from US. Pat. No. 3,675,062.
  • this Patent is a camera tube for television in which a signal electrode provided on the face plate as a wall electrode is passed through via .an electric leadthrough provided in the said face plate.
  • the electrically conductive material of said leadthrough consists of a plug of indium which is pressed into an aperture in the face plate and makes electric contact with the signal electrode. More than an electric contact between leadthrough and electrode is not necessary since said electrode itself readily adheres to the wall of the face plate.
  • Electrodes which are present at least partly at a distance from the wall of the envelope of the tube.
  • Such electrodes are, for example, cathodes, control electrodes, and the gauze electrodes conventionally used in a television camera tube of the vidicon type.
  • Each electrode involves its own problems as regards its connection in the tube and its electric leadthrough through the envelope of the tube.
  • electric discharge tubes in which the suspension and electric leadthrough of an electrode are entirely separated from each other. This is usually the case inter alia in the said gauze electrode of a television camera tube.
  • Known are also electric discharge tubes in which the electric leadthrough provided in the envelope also ensured the suspension of the associated electrode.
  • Such a construction is frequently used, for example, in transmitting tubes.
  • electric discharge tubes in which a combination of said methods is used.
  • An example hereof is the conventional suspension of an electron gun from the leadthrough pins in the base of a cathoderay tube.
  • the electric leadthrough consists of a metal leadthrough which is sealed in the envelope of the tube or is secured therein by means of a vitreous material as a connection means.
  • the electrode is secured to its leadthrough previously or afterwards.
  • the object of the invention to provide an electric discharge tube of the type mentioned in the preamble in which both the connection and the electric leadthrough of an electrode not provided on the wall of the envelope are realized in a rapid and simple manner.
  • the said electric discharge tube is characterized according to the invention in that an electrode which is present internally in the tube or a part connected to said electrode is hermetically bonded to or embedded in the indium-containing material of a leadthrough associated with said electrode.
  • indium-containing materials which satisfy the purpose underlying the invention are indium and alloys of indium and at least one of the metals platinum, gold, silver, copper, tin, lead, gallium and nickel. in the liquid phase these materials generally show the property that they readily wet other materials. This property is a necessary condition to obtain a good adhesion of an electrode to its leadthrough. Too strong a flowing of the indium-containing material over the surface of an electrode contacted therewith is not desired, however, since otherwise too little material remains in the leadthrough aperture to ensure a vacuum-tight leadthrough. In order to solve this problem both physical and chemical means are available.
  • an electrode comprises at least one projection for the connection which is sealed at or near the free end thereof in or to the indium-containing material of the leadthrough. It has been found that the indium-containing material then flows mainly only over the surface of the said projection.
  • the said problem may furthermore be solved by a suitable choice of the material of which the part of the electrode to be sealed consists. That is to say a material to which the indium-containing material readily adheres but across which it hardly flows in the liquid phase. This is met if, according to the invention, the part of the electrode to be sealed consists at least at the surface of chromium-nickel steel.
  • the part of the electrode to be sealed comprises near the sealing joint means which counteract too strong a flowing of the indium-containing material.
  • This means preferably consists of a chromium layer provided on the said part to be sealed. Such a layer generally shows an oxide skin which can be wetted only to the restricted extent by the indium-containing material.
  • FIG. 1 shows, not to scale, a perspective view partially broken away of an electric discharge tube according to the invention
  • FIG. 2 is an axial sectional view of a part of the tube shown in FIG. 1, and
  • FIGS. 3 and 4 shown other embodiments of an electrode suspension according to the invention.
  • the electric discharge tube shown in FIGS. 1 and 2 is a television camera tube whose envelope consists of a glass tube 1, which is sealed by a tube cap 2 and a window 3.
  • a photosensitive layer 17 is provided on the window which is secured to the tube by means of an indium ring 16.
  • a copper gauze electrode 4 is present within the envelope at a short distance from the window and parallel thereto. Said gauze electrode is connected between two chromium-nickel steel rings 5 and 6 which are secured together by spot welding.
  • Three resilient lugs 7 are cut out of the ring 5 so as to be regularly divided on the circumference and, at the area where they are sealed to the indium-containing material, comprise projections 18 cooperating with the apertures 8.
  • a layer of metal 9 is provided on the outer wall of the tube 1 so as to increase the contact area around the apertures 8. Said layer is preferably provided before the indium is pressed into the apertures 8 so that the wall of the apertures can also be lined with a thin layer of metal.
  • the electrode 10 is secured in the tube 1 by means of lugs 11 cut out of the wall of said electrode and the free end of which is again bonded to indium present in the apertures 12.
  • the electrode 10 together with the wall electrode 13 which is provided with an electric leadthrough 15 forms part of a system of lenses to focus the electron rays which are produced by an electron gun which is not shown in the drawing.
  • Said electron gun may be secured in the tube in the abovedescribed manner or in a conventional manner to the leadthrough pins 14 sealed in the tube base.
  • apertures are provided by means of sand blasting.
  • the walls of said apertures are covered with a thin layer of metal, preferably nickel.
  • Possible wall electrodes as well as the enlarged contact areas 9 are provided simultaneously.
  • the electrodes are inserted from the open ends of the tube in the axial direction and in the desired sequence and are fixed in the places of destination by means of resilient lugs snapping into the apertures.
  • projections 8 present on the free ends of the lugs contact is made with the indium-containing material which is already present in the apertures or is to be provided therein afterwards.
  • the said free ends of the lugs connected to the electrodes are then hermetically bonded to or in the indium-containing material of the leadthrough by degassing the tube in a vacuum space.
  • the indium-containing material melts in the leadthrough aperture, the layer of metal present on the wall of the aperture dissolves and adheres to the lugs connected to the electrode.
  • a vacuum-tight leadthrough is obtained to which the electrode is hermetically bonded via the said lugs.
  • FIGS. 3 and 4 For a readily defined position of the electrode, at least three suspension points are necessary. However, these need not all three form an electric leadthrough. It is already sufficient for one of said suspension points to form an electric leadthrough also, while the fixation of the other points is realized by cooperation of resilient lugs connected to the electrode and cavities recessed in the wall of the tube. If desired it is possible to fill said cavities with an indium-containing material in which or to which parts connected to an electrode are bonded in a similar manner as described above.
  • FIGS. 3 and 4 Other embodiments of an electric discharge tube according to the invention are shown in FIGS. 3 and 4.
  • the glass tube 20 shown in FIG. 3 has a widening 21 at one end on which the window 23. which has a photosensitive layer 24 is secured by means of an indium ring 22.
  • the gauze electrode 25 is secured in known manner between the rings 26 and 27 manufactured from coppernickel.
  • the ring 26 bears on the shoulder 28 formed internally at the area of the widening and is sealed to an alloy of percent indium and 5 percent tin with which the aperture 29 is filled.
  • Said indium alloy furthermore makes electric contact with a layer of nickel 30 provided on the outside on the wall of the tube for the above-mentioned reason.
  • the ring 26 is furthermore secured in a similar manner in a place which is situated diametrically opposite to the aperture 29. Near said connection places the ring 26 has a chromium layer which prevents too strong a flowing of the indium during sealing the ring 26.
  • FIG. 4 differs from that shown in FIG. 3 in so far that the annular shoulder 48 has been formed as a result of a local restriction of the tube 40.
  • the gauze electrode 45 connected between the rings 46 and 47 is secured in an analogous manner and led-out electrically as described with reference to FIG. 3.
  • the invention is preferably applied to television camera tubes, it is by no means restricted to said application.
  • the invention may very generally be used advantageously in particular in cathode-ray tubes. It will furthermore be obvious from the embodiments described that a large number of variations are possible without departing from the scope of the invention.
  • An electric discharge tube comprising a vacuumtight envelope having at least one aperture sealed by an indium-containing material to form an electrically conductive leadthrough, an electrode member arranged within said envelope, at least a portion of said member being spaced apart from the inner wall of said envelope and having a projection bonded to said indiumcontaining material.
  • indium-containing material includes indium or an alloy of indium and at least one metal selected from the group consisting of platinum, gold, silver, copper, tin, lead, gallium and nickel.
  • a method of securing and electrically leadingthrough an electrode in an electric discharge tube comprising the steps of providing at least one aperture in the envelope of the tube, covering at least the wall of said aperture with a layer of metal, sealing the said aperture with a plug of indium-containing material, placing an electrode which is provided with a projection, in the envelope and bonding said projection to the said indium-containing material, heating the tube in a vacuum at such a temperature that the indium-containing material melts, alloys with the metal provided on the wall of the aperture and adheres to the projection in such manner that after cooling of the tube a vacuumtight leadthrough is obtained.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US468184A 1973-05-23 1974-05-08 Electric discharge tube and method of manufacturing same Expired - Lifetime US3912851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7307168A NL7307168A (US07122603-20061017-C00294.png) 1973-05-23 1973-05-23

Publications (1)

Publication Number Publication Date
US3912851A true US3912851A (en) 1975-10-14

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Family Applications (1)

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US468184A Expired - Lifetime US3912851A (en) 1973-05-23 1974-05-08 Electric discharge tube and method of manufacturing same

Country Status (10)

Country Link
US (1) US3912851A (US07122603-20061017-C00294.png)
JP (1) JPS5751222B2 (US07122603-20061017-C00294.png)
AU (1) AU6912774A (US07122603-20061017-C00294.png)
BE (1) BE815370A (US07122603-20061017-C00294.png)
CA (1) CA1018581A (US07122603-20061017-C00294.png)
DE (1) DE2422811C2 (US07122603-20061017-C00294.png)
FR (1) FR2231100B1 (US07122603-20061017-C00294.png)
GB (1) GB1436919A (US07122603-20061017-C00294.png)
IT (1) IT1014217B (US07122603-20061017-C00294.png)
NL (1) NL7307168A (US07122603-20061017-C00294.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2927664A1 (de) * 1978-07-20 1980-01-31 Philips Nv Fernsehaufnahmeroehre
US4278912A (en) * 1978-06-24 1981-07-14 U.S. Philips Corporation Electric discharge tube having a glass-sealed electric leadthrough and method of manufacturing such an electric leadthrough
US4647137A (en) * 1985-03-26 1987-03-03 Voltarc Tubes, Inc. Lamp base connector assembly
US6114633A (en) * 1998-04-30 2000-09-05 Tecumseh Products Company Hermetic terminal with conductor pin identifier

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5289703U (US07122603-20061017-C00294.png) * 1975-12-27 1977-07-05
NL8006166A (nl) * 1980-11-12 1982-06-01 Philips Nv Opneemeenheid bevattende een opneembuis.
EP0193785A1 (de) * 1985-03-04 1986-09-10 Heimann GmbH Fernsehaufnahmeröhre vom Vidikontyp
JPS6116454A (ja) * 1985-07-03 1986-01-24 Hitachi Ltd 撮像管
DE19953533A1 (de) * 1999-11-05 2001-05-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Entladungslampe mit Elektrodenhalterung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899575A (en) * 1959-08-11 Glass-to-metal seals in cathode-ray tubes
US2925189A (en) * 1953-10-02 1960-02-16 Corning Glass Works Cathode-ray tube manufacture
US3099762A (en) * 1962-01-15 1963-07-30 Hertz Michael Cathode ray tube using replaceable cathode
US3541373A (en) * 1969-04-16 1970-11-17 Sylvania Electric Prod Cathode ray tube with bifurcated contact spring between the shadow mask frame and the internal conductive coating
US3567986A (en) * 1968-11-12 1971-03-02 Sylvania Electric Prod Cathode ray tube shadow mask supporting structure having straight springs mounted upon struck-out portions of the shadow mask frame
US3582978A (en) * 1969-08-28 1971-06-01 Tektronix Inc Rivet-shaped electrical lead-through contact
US3675062A (en) * 1966-02-11 1972-07-04 Fernseh Gmbh Method and apparatus for connecting to a nesa layer
US3714488A (en) * 1970-09-19 1973-01-30 Matsushita Electronics Corp Pick-up tube envelope sealant extending into groove of annular target support

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899575A (en) * 1959-08-11 Glass-to-metal seals in cathode-ray tubes
US2925189A (en) * 1953-10-02 1960-02-16 Corning Glass Works Cathode-ray tube manufacture
US3099762A (en) * 1962-01-15 1963-07-30 Hertz Michael Cathode ray tube using replaceable cathode
US3675062A (en) * 1966-02-11 1972-07-04 Fernseh Gmbh Method and apparatus for connecting to a nesa layer
US3567986A (en) * 1968-11-12 1971-03-02 Sylvania Electric Prod Cathode ray tube shadow mask supporting structure having straight springs mounted upon struck-out portions of the shadow mask frame
US3541373A (en) * 1969-04-16 1970-11-17 Sylvania Electric Prod Cathode ray tube with bifurcated contact spring between the shadow mask frame and the internal conductive coating
US3582978A (en) * 1969-08-28 1971-06-01 Tektronix Inc Rivet-shaped electrical lead-through contact
US3714488A (en) * 1970-09-19 1973-01-30 Matsushita Electronics Corp Pick-up tube envelope sealant extending into groove of annular target support

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278912A (en) * 1978-06-24 1981-07-14 U.S. Philips Corporation Electric discharge tube having a glass-sealed electric leadthrough and method of manufacturing such an electric leadthrough
DE2927664A1 (de) * 1978-07-20 1980-01-31 Philips Nv Fernsehaufnahmeroehre
US4276494A (en) * 1978-07-20 1981-06-30 U.S. Philips Corporation Cathode ray tube with transversely supported electrode and conductive wall coating
US4647137A (en) * 1985-03-26 1987-03-03 Voltarc Tubes, Inc. Lamp base connector assembly
US6114633A (en) * 1998-04-30 2000-09-05 Tecumseh Products Company Hermetic terminal with conductor pin identifier

Also Published As

Publication number Publication date
BE815370A (fr) 1974-11-21
DE2422811A1 (de) 1974-12-19
NL7307168A (US07122603-20061017-C00294.png) 1974-11-26
IT1014217B (it) 1977-04-20
JPS5751222B2 (US07122603-20061017-C00294.png) 1982-10-30
DE2422811C2 (de) 1985-04-04
FR2231100B1 (US07122603-20061017-C00294.png) 1979-02-16
GB1436919A (en) 1976-05-26
JPS5021622A (US07122603-20061017-C00294.png) 1975-03-07
FR2231100A1 (US07122603-20061017-C00294.png) 1974-12-20
CA1018581A (en) 1977-10-04
AU6912774A (en) 1975-11-20

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