US1596405A - Rontgen tube - Google Patents

Rontgen tube Download PDF

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Publication number
US1596405A
US1596405A US495910A US49591021A US1596405A US 1596405 A US1596405 A US 1596405A US 495910 A US495910 A US 495910A US 49591021 A US49591021 A US 49591021A US 1596405 A US1596405 A US 1596405A
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United States
Prior art keywords
tube
cathode
rntgen
wire
rays
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Expired - Lifetime
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US495910A
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English (en)
Inventor
Hermann V Dechend
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Individual
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Individual
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Publication of US1596405A publication Critical patent/US1596405A/en
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    • 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

  • My invention relates to improvements in Rntgen tubes, and more particularlv in:
  • the stream of cathode rays is always comparatively small and the portion of the anticathode which can be put to use is not more than a 'few square centimeters.
  • a larger part of the surface. of the cathode has been availed of for therapeutic purposes by changing the relative distance between the cathode and the anticathode, or by changing the curvature of the concave cathode, the object being to reduce the speciiic load on the focal spot, yet also in this case the whole energy of the stream of cathode rays is concentrated on a comparatively small surface of the anticathode, which therefore is highly heated because most of the energy is transform-ed into heat. To carry away the large amount of heat from the inaccessible anticathode is difficult in practice, so that the tube can not be charged beyond a certain limit.
  • the object of the improvements is to provide a Rntgen tube having an incandescent cathode which is entirely different in construction from constructions now in use and which permits an almost unlimited increase of the capacity of the tube.
  • my invention consists in providing large sources for electrons by equipping the tube with an incandescent cathode of increased length and one or more anodes of large Surfaces located at the side of the cathode.
  • the anodes are made from metals of high atomic weight, such for example as tantalum, tungsten, uranium, platinum,
  • the electrodes are located so as not to interfere with the discharge of the rays, and finally the terminals of the supply conductors to the electrodes must be disposed the proper distance apart, depending upon the voltage applied thereto.
  • F ig. l is a Vertical section of a Rntgen tube provided with an incandescent cathode.
  • Fig. 2 is a section taken on the line A-B of Fig. l, and
  • Fig. 3 is a sectional ication.
  • the incandescent cathode l is in the form of a bifurcated wire suspended with its middle portion from a coiled spring 3 secured to carriers 2 in the form of wires. The lower ends of the cathode are connected to terminals 4 and 5. On the wires 2 a wire net 6 is coiled which has the function to keep from the incandescent wire l the strong forces of electric attraction connected with View showing' a modithe operation at high volt-age.
  • the wire netl 6 constitutes a grid, and through the Carrier wires 2 and spring 3 this grid is in conducting connection with the cathode or filament l, so that the latter and the grid 6 will be at the same potential, thus preventing the high-voltage charges from deforming said filament.
  • F ig. 2 there are four upright carrier wire. portions 2, but for the sake of clearness, the upper portions of only two carrier wires 2 have been shown in Figs. 1 and 3.
  • the lower ends of the carriers are secured to arms 7 lixed to the upper end of a metallic sleeve 8 placed on a glass tube 9 fused to the body of the Rntgen tube.
  • the leading-in wires 4 and 5 are passed through the upper thickened end 10 of the tube 9, and they are spaced the required distance apart to provide suiicient insulation.
  • anodes 1l (Figs. l and 2) in the form of sheet metal strips are provided, which are made from a suitable metal of high melting temperature and high atomic weight. Said anodes or anti-cathodes are secured with their upper ends to arms 12 provided on a metallic sleeve 14 mounted on a glass tube 13. The leading-in wire 16 connected with the sleeve 14 is passed through the thickened lower end 15 of' the tube 13.
  • leading-in wires 4 and 5 of the incandescent wire 1 are connected with the terminals of a heating battery 17. Between the leading-in wires 4 and 5 and the lead ⁇ ing-in wire 16 a high-Voltage generator 18 of any suitable construction is interposed.
  • the plate-like anodes 11 are disposed with their surfaces at au angle relatively to each other, so that the space confined between them is broadened or fiares in the-direction of the object on which the rays are thrown, as is Shown in Fig. 2.
  • the anode 19 is in the form of a truncated hollow cone made from sheet metal having a high melting point and a -high atomic weight, and the said cone is spaced from the incandescent wire 20 and encloses it in substantially the same manner as described above, that is, the filament is located between flaring surfaces, or within a flaring space, and the two branches or legs of such filament are disposed in a plane transverse to the converging anode or anticathode portions which bound said space.
  • the rays are emitted in the direction of the axis of the cone and through the base thereof.
  • the anode 19 is supported on a transverse rod 21 disposed within a lateral extension 22 of the tube and connected with the leadingin wire 23.
  • anodes of considerable dimensions can be used, for example anodes having a radiating surface of or 100 square centimeters, without interfering with a reliable operation.
  • each square centimeterl is adapted to emit 40 watts. Therefore the capacity of the anode is as high as from one to four kilowatts.
  • a Rntgen tube comprising a cathode element adapted to be heated to incandescence by the passage of an electric current, and an anode element having portions located on opposite sides of said cathode clement andv at an Aangle to each other to form a flaring space within which-said cathode is located, said space being open at the wide portion for the escape of Rntgen rays.
  • a Rntgen tube comprising an anticathode element having converging portions which bound a flaring space open at those points--where said converging portions are farthest apart, and an arched cathode filament adapted to be heated to incandescence yand having its side members within said space in a plane which intersects said converging portions.
  • a Rntgen tube comprising a cathode filament, a carrier wire therefor, a spring connecting said Wire with the filament, a grid coiled on said wire, and an anticathode associated with said filament.
  • a Rntgen tube comprising a cathode filament, a grid coiled around the cathode si gnature.

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  • Radiation-Therapy Devices (AREA)
US495910A 1920-04-19 1921-08-27 Rontgen tube Expired - Lifetime US1596405A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1596405X 1920-04-19

Publications (1)

Publication Number Publication Date
US1596405A true US1596405A (en) 1926-08-17

Family

ID=7736772

Family Applications (1)

Application Number Title Priority Date Filing Date
US495910A Expired - Lifetime US1596405A (en) 1920-04-19 1921-08-27 Rontgen tube

Country Status (3)

Country Link
US (1) US1596405A (fr)
FR (1) FR534237A (fr)
NL (1) NL9357C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2613332A (en) * 1949-07-14 1952-10-07 Gen Electric Electric discharge device
US2621308A (en) * 1949-03-31 1952-12-09 Rca Corp Electronic tube and circuits
US2686884A (en) * 1950-05-01 1954-08-17 Dunlec Corp Space charge controlled X-ray tube
US20090257562A1 (en) * 2008-04-10 2009-10-15 O'hara David Mammography x-ray homogenizing optic

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621308A (en) * 1949-03-31 1952-12-09 Rca Corp Electronic tube and circuits
US2613332A (en) * 1949-07-14 1952-10-07 Gen Electric Electric discharge device
US2686884A (en) * 1950-05-01 1954-08-17 Dunlec Corp Space charge controlled X-ray tube
US20090257562A1 (en) * 2008-04-10 2009-10-15 O'hara David Mammography x-ray homogenizing optic
US7876883B2 (en) * 2008-04-10 2011-01-25 O'hara David Mammography X-ray homogenizing optic

Also Published As

Publication number Publication date
NL9357C (fr)
FR534237A (fr) 1922-03-22

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