US2813216A - Getter shield pickup loop - Google Patents

Getter shield pickup loop Download PDF

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Publication number
US2813216A
US2813216A US350092A US35009253A US2813216A US 2813216 A US2813216 A US 2813216A US 350092 A US350092 A US 350092A US 35009253 A US35009253 A US 35009253A US 2813216 A US2813216 A US 2813216A
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US
United States
Prior art keywords
shield
getter
cathode
envelope
slot
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
US350092A
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English (en)
Inventor
Ruth M Dailey
Rapaport Harold
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.)
CBS Corp
Original Assignee
Westinghouse 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
Priority to BE528263D priority Critical patent/BE528263A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US350092A priority patent/US2813216A/en
Application granted granted Critical
Publication of US2813216A publication Critical patent/US2813216A/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

Definitions

  • getters have been provided in vacuum tubes for cleaning up residual gas in vacuum tubes by chemical combination and adsorption after the tubes have been pumped out and sealed.
  • the getters are usually vaporized by placing them, while inside of the vacuum tube, in a high-frequency field.
  • the getter elements are thus heated, and some of the getter material is caused to be evaporated.
  • the vaporized metal deposits on the wall 'of the tube and collects the gas molecules by chemical combination therewith.
  • These pieces of getter material are usually placed in the tube in a position where they are substantially isolated from the remaining elements of the tube, particular care being exercised to prevent the deposition of the getter material on the insulators in the region of the high potential electrodes.
  • a cathode shield is therefore frequently provided to shield the envelope of the tube, in the region of the electrodes from contamination by the getter material.
  • Figure 1 is a plan view of a getter shieldbuilt in accordance with our invention.
  • Fig. 2 is an elevational view partly in cross section of a portion of the vacuum tube structure shown in Fig. 1, taken along the line IIII of Fig. 1.
  • a vacuum tube envelope 4 having extending through the wall thereof a first cathode lead 6 and a second cathode lead 8.
  • the walls 4 of the envelope are preferably of a dielectric material such as glass so that it provides an insulation between the cathode leads 6, 8.
  • a cathode 10 is provided inside the envelope having one end connected to the first lead 6 and the other end connected to the second lead 8.
  • a cathode shield 12 Surrounding the cathode leads 6, 8 a short distance from their junction with the envelope 4, is a cathode shield 12 which serves to protect the region of the tube where the high potential electrodes are located from contamina- 2,813,216 Patented Nov. 12, 1957 tion by the getter material.
  • the cathode shield 12 comprises a flat piece of metal encircling the two cathode leads and substantially filling that end of the envelope. At the edge of the cathode shield 12 there is a flange 14 which bends downward toward the region where the cathode leads join the tube envelope.
  • the flange 14 employed in the preferred embodiment of our invention serves to aid in confining the getter material to the lower part of the tube.
  • the cathode shield 12 In the region of the first cathode lead 6, the cathode shield 12 has a flange 16 which is adapted to engage the first cathode lead 6 so as to provide support for the shield 12. In the region of the second cathode lead 8 the shield 12 is cut away sutficiently to prevent electrical connection between the second cathode lead 8 and the shield 12.
  • a slot 18 is cut across the shield which in the preferred embodiment of our ihvention extends approximately threequarters of the distance across the shield 12. However, in accordance with the broader aspects of our invention the slot may extend a much shorter distance and in some instances it is believed that a slot extending one quarter of the way across the shield would be suflicient.
  • the slot 18 preferably extends in a direction perpendicular to an axis through the two cathode leads 6, 8. However, in accordance with other embodiments of our invention the slot could cut through the shield at other places such as through the thin strip 19 opposite an electrode lead hole. Near the end of the slot 18 at the edge 14 of the disc 12 there is provided a getter wire 20.
  • the getter wire 20 may be composed of any of a large number of materials which are well-known in the art such as barium or magnesium which are easily vaporized and which produce a getter effect.
  • the getter wire 20 is connected to the under side of the shield 12 near an edge of the shield at one side of the slot 18, extends across the slot 18 and is connected to the under side of the shield 12 near the edge thereof at the other side of the slot 18.
  • a cathode shield 12 which when placed in a high-frequency field acts as an antenna or pickup loop since the only connection between the two halves of the shield 12 at one end of the shield is the getter wire 20.
  • the shield tends to concentrate the electromagnetic oscillations, which it has absorbed, in the getter wire.
  • high-frequency electromagnetic fields of relatively low power in the region of the vacuum tube can produce substantial heating in the getter 20 without producing excessive heating of the other elements of the tube.
  • An electron tube comprising a vacuum-tight envelope, a cathode element inside said envelope, said element having two leads for applying current thereto, said leads extending through said envelope, a getter shield surrounding said leads and supported by one of said leads, said getter shield comprising a circular piece of metal having a slot cut at least half way across said shield, a strip of getter material anchored at each end thereof to said shield and extending across said slot near the edge of said shield.
  • An electron tube comprising a vacuum-tight envelope, a cathode element inside of said envelope, said cathode element having two leads extending through said envelope for supplying current to said element, a getter shield comprising a substantially flat piece of metal lying in the region around said leads inside of said envelope and making physical contact with one of said leads, the outer edges of said getter shield being flanged at an angle to the main body of said getter shield, said shield having a slot therein extending into said getter shield at least one fourth of the distance across said shield, a strip of getter material extending across said slot near the edge of said disc and being anchored at each end to said disc.
  • An electron tube comprising a vacuum-tight envelope having therein a cathode element having leads connected thereto extending through said envelope, a cathode shield surrounding said leads and lying substantially perpendicular to said leads, said cathode shield comprising a substantially flat piece of metal having flanges which are bent in the opposite direction from said cathode heater, 2.
  • said shield making physical contact with said lastmentioned lead through said last-mentioned contact flange, a slot extending from an edge of said shield a substantial distance intosaid shield, a strip of getter material attached to said shield on one side of said slot near an edge of said shield extending across said slot and making contact with said shield on the other side of said slot near the edge of said shield.
  • An electron tube comprising a vacuum-tight envelope, a cathode element inside said envelope, said element having two leads for applying current thereto, said leads extending through said envelope, a getter shield surrounding said leads and supported thereby, said getter shield comprising a generally circular disc of metal having a slot cut at least one quarter of the distance across it, a strip of getter material anchored at each end to said shield and extending across said slot near the edge of said shield.
  • An electron tube comprising a vacuum-tight envelope, an electrode lead extending through said envelope, a getter shield comprising a substantially flat piece of metal lying in the region around said lead inside of said envelope and supported by said lead, said getter shield having a slot extending into said getter shield at least one quarter of the distance across said shield, a strip of getter material extending across said slot near the edge of said disc and being anchored at each end to said disc.
  • An electron tube having therein a getter shield, said getter shield comprising a substantially flat piece of metal having flanges at the edges thereof, said getter shield having a slot extending from an edge of said shield a substantial distance across said shield, a strip of getter material attached to said shield on one side of said slot near an edge of said shield and extending across said slot and making contact with said shield on the other side of said slot near the edge of said shield.
  • An electron tube comprising a vacuum-tight envelope, a getter shield in the form of a thin sheet of material inside said envelope, said shield having a discontinuity therein extending inward from an edge thereof, a strip of getter material extending across said discontinuity and being connected to said shield near an edge thereof on each side of said discontinuity.

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  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US350092A 1953-04-21 1953-04-21 Getter shield pickup loop Expired - Lifetime US2813216A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE528263D BE528263A (it) 1953-04-21
US350092A US2813216A (en) 1953-04-21 1953-04-21 Getter shield pickup loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US350092A US2813216A (en) 1953-04-21 1953-04-21 Getter shield pickup loop

Publications (1)

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US2813216A true US2813216A (en) 1957-11-12

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Application Number Title Priority Date Filing Date
US350092A Expired - Lifetime US2813216A (en) 1953-04-21 1953-04-21 Getter shield pickup loop

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US (1) US2813216A (it)
BE (1) BE528263A (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090852A (en) * 1960-02-11 1963-05-21 Gen Electric Gettering arrangement for a vacuum circuit interrupter
US4331850A (en) * 1978-12-01 1982-05-25 Hazemeijer B.V. Vacuum switch including a getter device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084037A (en) * 1929-12-28 1937-06-15 Ernest Anton Lederer Electric rare gas filled lamp
US2373950A (en) * 1942-07-21 1945-04-17 Eitel Mccullough Inc Electronic tube
US2617956A (en) * 1951-06-27 1952-11-11 Gen Electric High-frequency discharge device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084037A (en) * 1929-12-28 1937-06-15 Ernest Anton Lederer Electric rare gas filled lamp
US2373950A (en) * 1942-07-21 1945-04-17 Eitel Mccullough Inc Electronic tube
US2617956A (en) * 1951-06-27 1952-11-11 Gen Electric High-frequency discharge device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090852A (en) * 1960-02-11 1963-05-21 Gen Electric Gettering arrangement for a vacuum circuit interrupter
US4331850A (en) * 1978-12-01 1982-05-25 Hazemeijer B.V. Vacuum switch including a getter device

Also Published As

Publication number Publication date
BE528263A (it)

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