US1632230A - X-ray tube - Google Patents

X-ray tube Download PDF

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Publication number
US1632230A
US1632230A US2559A US255925A US1632230A US 1632230 A US1632230 A US 1632230A US 2559 A US2559 A US 2559A US 255925 A US255925 A US 255925A US 1632230 A US1632230 A US 1632230A
Authority
US
United States
Prior art keywords
cathode
vessel
rays
incandescent
ray 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
US2559A
Other languages
English (en)
Inventor
Holst Gilles
Bouwers Albert
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of US1632230A publication Critical patent/US1632230A/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
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor

Definitions

  • the present invention relates to X-ray tubes with an incandescent cathode.
  • the known Coolidge-X-ray tubes have hitherto been provided with a focussingdevice which assembled the cathode-rays to a concentrated beam already in the neighborhood of the cathode.
  • the incandescent cathode is arranged in concentrated form, for example in the shape of a spiral, within acylindrical focussing device.
  • the incandes- 15 cent cathode is arranged within a metal, vessel extending inside the outer wall of the tube, the anti-cathode being so insulated from the said vessel that this insulation is capable of resisting the operating voltage to W be supplied between the incandescent cathode and theanti-cathode.
  • the metal vessel is constricted to form an opening for the passage of the cathode-rays, and that part of the anti-' cathode on which the cathode-rays strike, is arranged in or near that opening.
  • the metal vessel may be so constructed as. to surround the incandescent cathode almost entirely. It is obvious that apart from w the aperture for the passage of the cathoderays an opening in the vessel must be proyided for letting through the X-rays, which opening, however, if desired, may be shut ofl by means of a metal window or gauze 35 which allows the X-rays to pass.
  • the metal vesselwithin which the incandescent cathode is arranged is con 5 nected to the incandescent cathode, either
  • a metal vessel having a constant, preferably, a negative p tential, ofiers the advantage that the X- ray tube operates constantly, the irregular charging of a glass wallcausing no longer any trouble.
  • Another advantage is that the X-ra ye emanate merely from the anti-cathode mir ror, not from other parts of the anti-cathode.
  • the cathode-rays are concentrated on a limited area of the anti-cathode owing to the peculiar shape and the arrangementof the metal vessel and the anti-cathode relatively to each other.
  • drawing illustrates by way of example a construction of an X-ra tube according to the invention.
  • the outer wall of the X-ray tube is constituted by a glass vessel 1 to which a re-entrant glass tube 2 is hermetically sealed.
  • An anticathode dconsisting, for example, materially of chrome-iron is hermetically sealed to the end of the tube 2.
  • An insertion piece 4 consisting, for example, of tungsten, is secured to the front face of the incandescent cathode and a metal tube 5 serves to supply a coolby a straight wire made for example of tungsten, is secured within the metal vessel 9 to leading-in wires 11 andul2 which are hermetically sealed into the wall of the vessel 1 and which. are insulated from the metal vessel 9 by means of quartz beads 13 and 14.
  • the me tal vessel 9 On the side of the anti-cathode the me tal vessel 9 is constricted to an opening 15 and on the other side an aperture or window 16 is provided in order to allow the X-rays to pass.
  • X-ray tubes may be exhausted in some'known manner so that the discharge occurs practically without aeaaaae any gas-ionization.
  • the tubes may likewise be provided with a gaseous filling con-' sisting of hydrogen or helium which has such a pressure that no detrimental gasionization occurs.
  • This gas pressure may be above 0.0006 millimetre of mercury and in case of a hydrogenous filling it ma amount, for example, to about 0.01 millimetre.
  • An X-ray tube comprising an incandescent cathode characterizedin that vthe in- 'cande'scent cathode is arranged within a metal vessel extending inside the outer wall of the tube, the anticat-hode being so insulated from the said vessel that this insulation is capable of resisting the operating voltage to be supplied between the incandescent cathode and the anticathode, the-said vessel atthe'side of the anticathode being constricted to form an opening for the passage of the cathode rays, the part of the anticathode which is struck by the cathode rays being located near said vessel.
  • A11 X-ray tube comprising an incande's cent cathode, characterized in that the incandescent cathode is arranged, within a metal vessel extending inside the outer wall of the tube, the anticathode being so insulated from the said vessel that this insulation is capable of resisting the operating voltage to be. supplied between the incandescentcathode and the anticat-hode a part of said metal vessel being arranged closely tothe anticathode and being so constructed in.

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  • X-Ray Techniques (AREA)
US2559A 1924-03-10 1925-01-15 X-ray tube Expired - Lifetime US1632230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL230497X 1924-03-10

Publications (1)

Publication Number Publication Date
US1632230A true US1632230A (en) 1927-06-14

Family

ID=19779918

Family Applications (1)

Application Number Title Priority Date Filing Date
US2559A Expired - Lifetime US1632230A (en) 1924-03-10 1925-01-15 X-ray tube

Country Status (5)

Country Link
US (1) US1632230A (OSRAM)
DE (1) DE499166C (OSRAM)
FR (1) FR591794A (OSRAM)
GB (1) GB230497A (OSRAM)
NL (1) NL18912C (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651727A (en) * 1950-03-22 1953-09-08 Ehrenberg Werner X-ray tube
US2720607A (en) * 1952-06-23 1955-10-11 Edward L Criscuolo Sealed off, fine focus, long life, flash x-ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122639B (de) * 1959-10-28 1962-01-25 Licentia Gmbh Hochstromroentgenroehre

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651727A (en) * 1950-03-22 1953-09-08 Ehrenberg Werner X-ray tube
US2720607A (en) * 1952-06-23 1955-10-11 Edward L Criscuolo Sealed off, fine focus, long life, flash x-ray tube

Also Published As

Publication number Publication date
NL18912C (OSRAM)
FR591794A (fr) 1925-07-17
DE499166C (de) 1930-06-03
GB230497A (en) 1926-01-14

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