US2829870A - Thermoconductive screening can for electronic tube - Google Patents

Thermoconductive screening can for electronic tube Download PDF

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Publication number
US2829870A
US2829870A US512240A US51224055A US2829870A US 2829870 A US2829870 A US 2829870A US 512240 A US512240 A US 512240A US 51224055 A US51224055 A US 51224055A US 2829870 A US2829870 A US 2829870A
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US
United States
Prior art keywords
screening
tube
bulb
network
heat
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
US512240A
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English (en)
Inventor
Poppe Etienne Fideel
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2829870A publication Critical patent/US2829870A/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
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/12—Double-wall vessels or containers

Definitions

  • the tube If in the vicinity of the hot point of the tube itself, the. temperature exceeds. a certain value, the tube is deteriorated, its internal screening layer in magnesium being evaporated and deposited on the electrodes.
  • a first object of the invention is to produce a thermoconductive device between each electronic tube and its screening can so that the heat can be conducted from the outer casing of the tube towards the screening can.
  • a second object of the invention is to provide a thermoconductive device enabling further to conduct the heat from any screening can towards the external common casing in contact with the ambient air.
  • a screening can for an electronic tube which is adaptable to the socket of said tube and is heat conductive. It comprises at its superior internal surface an elastic device (for instance a spring) resting on the bulb of said tube, the can being such that its internal surface is formed by an elastic network with braided conductive metal strips of suitable thickness leaving an internal dimension slightly inferior to the external dimension of the bulb of said tube so as to ensure a good contact (nevertheless elastic), between said bulb and said network when the can is placed around the tube and so that the network is normally maintained against the can by said elastic device so as to enable the heat to be conducted from the bulb towards the screening can via said network.
  • an elastic device for instance a spring
  • said screening can itself or a member enchased on the end part of said can is made of conductive metal (for instance red copper), the end part of said can or of said member having a cone frustum shape so as to fit easily within a fixation aperture of the common external casing in contact with the ambient air, said end part penetrating in said aperture against the action of said elastic device, a good contact being thus ensured between said atent can and said external casing which permits, through the conductive link with conductive metal, to conduct the heat from said can to said external casing.
  • conductive metal for instance red copper
  • Fig. 1 shows a sectional view of an electronic tube and its screening can according to the invention
  • Fig. 2 shows as an example a method of fixing the screening can to the socket of said electronic tube.
  • Fig. 1 shows an electronic tube of which the bulb is represented by 1 and the socket by 2. On this tube is placed a cylindrical screening can 3. This screening can can be fixed to the socket 2 by the well known method shown at Fig. 2.
  • the spring 9 (Fig. 1) is compressed between the can and the bulb so that the pin 10 of the socket is then lifted in the first vertical groove of the can shown at the left of Fig. 2.
  • the pin 10 of the socket is displaced in the horizontal groove of the can and by releasing the latter, the action of the spring 9 forces the can upwards whilst the pin 10 descends vertically in the second vertical groove shown at the right of the can (Fig. 2).
  • the space between the external cylindrical surface of the bulb 1 and the internal cylindrical surface of the screening can 3 being normally filled with air constitutes a cushion non-conductive for heat which may cause high temperatures at the hot point of the bulb in the vicinity of the anode (not shown).
  • a network of braided metal conductive threads 4 is inserted between the bulb 1 and the screening can 3. This network is fixed cylindrically against the internal surface of the screening can, to which it is maintained for instance by the greater turn of spring 9.
  • the network metallic conductor may for instance be copper; the can for instance may be brass.
  • the radial thickness of the network 4 is such that the internal diameter of the can with the network is slightly less than the external diameter of the bulb 1 so that a good contact is thus ensured between the bulb and the network.
  • the braided copper network 4 presents, besides its conductivity, the advantage that it has a certain elasticity enabling the screening can to be easily applied to the electronic tube and as easily withdrawn.
  • the bulb 1 when the can is placed around the tube, the bulb 1 provides a further lateral support for the network 4 against the can 3.
  • a heat conductive member 5 (for instance of red copper) can, for instance, be enchased, so as to serve as a link between the screening can 3 and the common external casing 7, (for instance a cover) (Fig. 1).
  • the member 5 can be ended, for instance, in a cone frustum shape which can be provided with an aperture 8 in order to verify if the tube is working or not.
  • the cone frustum part of the member 5 conforms with a corresponding cone frustum cavity of the common external casing 7, or, for instance, of a heat conductive ring 6 (in red copper), fixed on the external casing "I (Fig. l).
  • the more narrow part of the cone frust-um shaped members can easily be inserted in the wider part of the frustum shaped cavity of ring 6, and the member 5, as well as the can 3 and the tube 1, 2, are automatically centered by the cone frusturn guiding. A good contact is thus ensured, since also, when the external casing '7 (copper) is in position, the spring 9 is slightly compressed, thus exerting a force which increases the contact pressure between the member 5 and the ring 6.
  • the screening can 3 can be made entirely of red copper and may be terminated by a frustum cone profile which avoids the enchasing of member 5.
  • a screening can for an electronic tube which is attachable to the socket of said tube and is heat conductive and comprises an elastic device within said can which rests on the bulb of said tube, characterized in this, that the internal surface of said can is covered by an elastic network of braided conductive metal threads of suitable thickness, said network having internal dimensions slightly less than the external dimensions of the bulb of said tube so as to ensure a good, though elastic, contact between said bulb and said network when said can is placed around said tube, said network being normally maintained against said can by said elastic device so that the heat can be conducted from the bulb to the screening can via the said network.
  • a screening can as claimed in claim 1, and adapted to be attached to an external casing, characterized in this, that said screening can further comprises means at the end thereof formed of heat conductive metal and having the shape of a cone frustum, so as to be easily fitted into a fixation aperture in the external casing in contact with ambient air, said means being urged into the aperture against the action of said elastic device, a good contact being thus ensured between said can and the external casing enabling heat to be conducted from said can to the external casing.

Landscapes

  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US512240A 1954-07-14 1955-05-31 Thermoconductive screening can for electronic tube Expired - Lifetime US2829870A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE788562X 1954-07-14

Publications (1)

Publication Number Publication Date
US2829870A true US2829870A (en) 1958-04-08

Family

ID=3880592

Family Applications (1)

Application Number Title Priority Date Filing Date
US512240A Expired - Lifetime US2829870A (en) 1954-07-14 1955-05-31 Thermoconductive screening can for electronic tube

Country Status (3)

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US (1) US2829870A (enrdf_load_html_response)
BE (1) BE530361A (enrdf_load_html_response)
GB (1) GB788562A (enrdf_load_html_response)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043973A (en) * 1957-05-31 1962-07-10 Siemens Ag Cooling thermally stressed parts of electron tubes
DE1165696B (de) * 1959-09-10 1964-03-19 Internat Electronic Res Corp Waermeableitende und erschuetterungsdaempfende Einlage fuer im wesentlichen zylindrische Gehaeuse fuer elektronische Bauelemente
US3141719A (en) * 1961-08-03 1964-07-21 Esquire Inc Light fixture
US3185756A (en) * 1960-05-02 1965-05-25 Cool Fin Electronics Corp Heat-dissipating tube shield
US3196936A (en) * 1962-04-27 1965-07-27 Thomson Houston Comp Francaise Heat dissipating structure
US3445799A (en) * 1966-10-17 1969-05-20 Texas Instruments Inc Electric winding protective means
US3656545A (en) * 1968-05-21 1972-04-18 Varian Associates Fibrous vapor cooling means

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1538159A (en) * 1925-05-19 Cooling device
US2398626A (en) * 1944-12-20 1946-04-16 Cinch Mfg Corp Shielded tube mounting
US2497963A (en) * 1947-01-02 1950-02-21 Teletone Radio Corp Attachment for radio sets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1538159A (en) * 1925-05-19 Cooling device
US2398626A (en) * 1944-12-20 1946-04-16 Cinch Mfg Corp Shielded tube mounting
US2497963A (en) * 1947-01-02 1950-02-21 Teletone Radio Corp Attachment for radio sets

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043973A (en) * 1957-05-31 1962-07-10 Siemens Ag Cooling thermally stressed parts of electron tubes
DE1165696B (de) * 1959-09-10 1964-03-19 Internat Electronic Res Corp Waermeableitende und erschuetterungsdaempfende Einlage fuer im wesentlichen zylindrische Gehaeuse fuer elektronische Bauelemente
US3185756A (en) * 1960-05-02 1965-05-25 Cool Fin Electronics Corp Heat-dissipating tube shield
US3141719A (en) * 1961-08-03 1964-07-21 Esquire Inc Light fixture
US3196936A (en) * 1962-04-27 1965-07-27 Thomson Houston Comp Francaise Heat dissipating structure
US3445799A (en) * 1966-10-17 1969-05-20 Texas Instruments Inc Electric winding protective means
US3656545A (en) * 1968-05-21 1972-04-18 Varian Associates Fibrous vapor cooling means

Also Published As

Publication number Publication date
GB788562A (en) 1958-01-02
BE530361A (enrdf_load_html_response)

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