US1922162A - Evacuation of electronic devices - Google Patents

Evacuation of electronic devices Download PDF

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Publication number
US1922162A
US1922162A US591967A US59196732A US1922162A US 1922162 A US1922162 A US 1922162A US 591967 A US591967 A US 591967A US 59196732 A US59196732 A US 59196732A US 1922162 A US1922162 A US 1922162A
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US
United States
Prior art keywords
getter
ribbon
tube
support
powder
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
US591967A
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English (en)
Inventor
Aden J King
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.)
KING LABORATCRIES Inc
Original Assignee
KING LABORATCRIES Inc
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 KING LABORATCRIES Inc filed Critical KING LABORATCRIES Inc
Priority to US591967A priority Critical patent/US1922162A/en
Priority to GB14398/33A priority patent/GB410614A/en
Priority to NL65412A priority patent/NL35931C/xx
Priority to FR756225D priority patent/FR756225A/fr
Application granted granted Critical
Publication of US1922162A publication Critical patent/US1922162A/en
Priority to BE403096D priority patent/BE403096A/xx
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
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49206—Contact or terminal manufacturing by powder metallurgy

Definitions

  • the accepted methods of exhausting airfrom vacuum tubes are to evacuate the tube as thoroughly as possible by the action of pumping devices, then to seal off the tube while on the pump, and, as a final step, removing the greater part of the residual gasesby getter action.
  • a common getter is magnesium which is supported to one of the electrodes of the tube before the sealing step.
  • the usual method of flashing the getter is to introduce the tube into the field of a high frequency coil, the magnesium tape, or the shield, to Which it is attached, being heated by high frequency current passed through the coil to its flash temperature. On the flashing of the getter, the larger part of the residual gases is effectively removed by chemical and physical action.'
  • the tube is then found to be suitably evacuated for operation with the usual potentials.
  • the practice in the past has been to assemthe other of the two following methods:
  • the magnesium getter is supported by electrically spot welding a piece of magnesium ribbon directly to one of the electrode plates, to a separate metal plate or to a metal cup, which is later attached to one of the electrodes, or electrode supports, within the tube.
  • the disadvantages of this method are that it is not de sirable to be limited only to magnesium as a getter, and, furthermore, the magnesium ribbon must be first cut into suitable lengths, welded to its mounting plate in several places in order to get close contact, the mounting plate must be welded to a support wire, and, finally,
  • This method ble and mount the getter material in one or This invention relates to the production of has many undesirable features in that not only are there many separate steps required in the formationo'f the pellet and in the mounting of the getter within the tube, these disadvantages being substantially-the same as have been referred to in connection with the description of the magnesium ribbon getter, but due to the limited contact between the getter and its container, the heat transfer between the container and the pellet is poor, and, as a result, much higher temperatures are required for flashing or vaporizing the getter.
  • the getter cup due to the fact that the pellet is contained in, and shielded by, the getter cup, no direct heating of the pellet by eddy currents from the high frequency current is realized, and the vaporization of the getter is obtained only by radiation or slight heat conduction.
  • These characteristics of the common form of getter require higher temperatures in the getter cup and require greater power in-. put to the high frequency coils, more high frequency coils, and a longer time on the bombarding machine.
  • the high temperatures required have prevented many materials, such a cerium, mischmet'al, or other metals having high boiling points, which would effectively serve as getters, from being used, because the temperature to which the getter container must be raised before such getters reach their vaporization point, causes melting or vaporization of the container itself.
  • An object of this invention is to provide a getter which may be vaporized at relatively low temperatures.
  • Another'object of the invention is to form a getter support of which the getter is an integral part.
  • Another object of the invention is to provide intimate contact between a getter and its support.
  • Another object of the invention is to provide a. manufacturing process for the economic production of efficient getters on a quantity production basis. 7
  • getter material in powdered form is placed on a metallic sheet, and in a later step the material is pressed directly into the support to effectively weld the getter material into the support.
  • One satisfactory way of doing this is to pass a metallic ribbon underneath a hopper which feeds desired amounts of getter material at spaced intervals along the ribbon which then passes underneath a press which presses the material into the ribbon so that the two are pressed or welded together. The metal-.
  • lic sheet is later cut into sections, each section forming a getter and getter support which may be readily and quickly welded to a support within a vacuum tube.
  • the getter material which is preferably used is a barium-aluminum alloy which I have originated.
  • Examples of my preferred alloys are as follows:
  • Fig. 1 is a diagrammatic view of a manufacturing method which may be used for forming a getter structure, according to this invention
  • Fig. 2 is a plan view of one form of a getter structure constructed by the process of Fig. 1;
  • Fig. 3 is a side view, in section, of a preferred form of getter structure formed according to a process of Fig. 1, and
  • Fig. 4 is a view of the internal structure of a vacuum tube with the getter structure, such as shown by Fig. 2, attached to one of the electrode supports.
  • a metallic ribbon 5, which may be nickel, is made to pass, by the employment of any suitable apparatus, under the hopper 6, which contains the getter material '7, in powdered form and which deposits, under suitable control, the proper amount of getter material 8 at spaced intervals on the ribbon.
  • the ribbon next passes between the two members 9 and 10 of a press.
  • the two members 9 and 10 are pressed together, with or without the use of heat, and sufficient pressure is used to press the getter material into the surface of the ribbon and to form the indentures 11 in the base of which the pressed getter material 12 is contained.
  • the ribbon is then cut into sections by any suitable method and each of these sections is then ready for mounting in a vacuum tube as a complete getter assembly.
  • Fig. 3 shows a form of getter structure which may be manufactured, according to a process of Fig. 1.
  • the stamp members act to form a deep cup 13 in the base of which the getter material 12 is pressed.
  • An advantage of this form of getter structure is that the deposit of the material when vaporized is limited to the lower part of the tube.
  • Fig. 4 illustrates one way in which the getter structure, according to this invention, may be assembled in a vacuum tube.
  • the getter section 14 of Fig. 2 has welded thereto the support wire 15, and this wire 15, in turn, is spot welded to the anode support 16.
  • the elements of the tube shown by Fig. 4 are well known and, since forming no part of this invention, will not be described in detail.
  • the getter material is pressed into the getter shield, support, or plate, as it is variously described.
  • the getter material is in such intimate contact with the metal sheet that its heat and electrical conductivity are high, there being no appreciable losses.
  • the heat generated in the getter support by the action of the high frequency field, is transmitted without loss to the getter material, which, as a result, vaporizes at a relatively low temperature. This results not only in the fact that many materials which otherwise could not be utilized in getters may be effectively used, but the time required for gettering the tube is reduced and the number of bombarding stages required are reduced.
  • the getter assembly may be mounted at a lower position in the tube, without loss of efficiency in flashing, so that the deposit of vaporized metal, when a getter structure such as shown by Figs. 2 and 4 is employed, does not extend an undesirable distance on the inside of the tube wall, or glass stem supporting the electrodes.
  • Fig. 1 the manufacturing process illustrated diagrammatically by Fig. 1, not only produces an improved getter, but the manufacture of the getter structures is rendered simpler and less expensive. It is no longer necessary 'to form the getter into pellets, the getter material being pressed in powdered form into its supporting metal.
  • the method of manufacturing a getter assembly which comprises reducing getter material to a powder, and pressing the powder into a support.
  • the method of producing a getter assembly which comprises reducing getter material to a powder, forming an indentation in a metallic support, and in the same operation pressing the powder into the base of the indentation.
  • the method of producing getter assemblies which comprises reducing getter material to a powder, feeding powder at spaced intervals along a metallic ribbon, pressing the powder into the ribbon, and then separating the ribbon between the spaced intervals to provide individual getter assemblies.
  • the method of producing getter assemblies which comprises feeding getter material at spaced intervals along a metallic ribbon, pressing the deposited material in each instance between a pair of dies which forms an indented portion into the base of'which the getter material is pressed, and severing the ribbon between the spaced intervals to provide individual getter assemblies.
  • the method of producing getter assemblies which comprises reducing getter material to powder, depositing the powder at spaced intervals along a metallic ribbon, pressing the powder into the ribbon so as to form an indentation in each instance in which the powder is pressed into the base thereof, and severing the ribbon between the pressed portions to provide the individual assemblies.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
US591967A 1932-02-10 1932-02-10 Evacuation of electronic devices Expired - Lifetime US1922162A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US591967A US1922162A (en) 1932-02-10 1932-02-10 Evacuation of electronic devices
GB14398/33A GB410614A (en) 1932-02-10 1933-05-18 Improvements in and relating to methods of manufacturing getters
NL65412A NL35931C (fr) 1932-02-10 1933-05-24
FR756225D FR756225A (fr) 1932-02-10 1933-05-29 Perfectionnements aux procédés de fabrication des <<getters>> pour tubes à vide
BE403096D BE403096A (fr) 1932-02-10 1934-05-11

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US591967A US1922162A (en) 1932-02-10 1932-02-10 Evacuation of electronic devices
GB14398/33A GB410614A (en) 1932-02-10 1933-05-18 Improvements in and relating to methods of manufacturing getters

Publications (1)

Publication Number Publication Date
US1922162A true US1922162A (en) 1933-08-15

Family

ID=26250532

Family Applications (1)

Application Number Title Priority Date Filing Date
US591967A Expired - Lifetime US1922162A (en) 1932-02-10 1932-02-10 Evacuation of electronic devices

Country Status (5)

Country Link
US (1) US1922162A (fr)
BE (1) BE403096A (fr)
FR (1) FR756225A (fr)
GB (1) GB410614A (fr)
NL (1) NL35931C (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449786A (en) * 1943-03-05 1948-09-21 Westinghouse Electric Corp Getter
US2524000A (en) * 1945-12-17 1950-09-26 Raytheon Mfg Co Vacuum condenser
US2536879A (en) * 1943-02-15 1951-01-02 Gabrielli Ernesto System of getter protection in high vacuum tubes
US3529334A (en) * 1967-08-11 1970-09-22 Isaac S Goodman Assembling and brazing method
US4910868A (en) * 1988-02-25 1990-03-27 Merlin Gerin Manufacturing process of an electrical contact with contact pad
US5312607A (en) * 1991-04-16 1994-05-17 Saes Getters S.P.A. Process for the sorption of residual gas by means by a non-evaporated barium getter alloy

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1067942B (de) * 1959-10-29 VEB Werk für Fernmeldewesen, Berfin-Oberschöneweide Nicht verdampf ender Getterstoff aus Titan, Zirkon, Vanadin, Niob und gegebenenfalls Aluminium für elektrische Entladungsgefäße und Verfahren zu seiner Herstellung
DE743302C (de) * 1938-05-04 1943-12-22 Sueddeutsche App Fabrik G M B Verfahren zur Herstellung von Selen-Trockengleichrichtern und -Photozellen
DE1028699B (de) * 1954-07-10 1958-04-24 Egyesuelt Izzolampa Verfahren und Vorrichtung zum Herstellen eines rohrfoermigen Getterstofftraegers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2536879A (en) * 1943-02-15 1951-01-02 Gabrielli Ernesto System of getter protection in high vacuum tubes
US2449786A (en) * 1943-03-05 1948-09-21 Westinghouse Electric Corp Getter
US2524000A (en) * 1945-12-17 1950-09-26 Raytheon Mfg Co Vacuum condenser
US3529334A (en) * 1967-08-11 1970-09-22 Isaac S Goodman Assembling and brazing method
US4910868A (en) * 1988-02-25 1990-03-27 Merlin Gerin Manufacturing process of an electrical contact with contact pad
US5312607A (en) * 1991-04-16 1994-05-17 Saes Getters S.P.A. Process for the sorption of residual gas by means by a non-evaporated barium getter alloy

Also Published As

Publication number Publication date
NL35931C (fr) 1935-07-15
BE403096A (fr) 1934-06-30
GB410614A (en) 1934-05-24
FR756225A (fr) 1933-12-05

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