US2097002A - X-ray tube - Google Patents

X-ray tube Download PDF

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Publication number
US2097002A
US2097002A US747103A US74710334A US2097002A US 2097002 A US2097002 A US 2097002A US 747103 A US747103 A US 747103A US 74710334 A US74710334 A US 74710334A US 2097002 A US2097002 A US 2097002A
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US
United States
Prior art keywords
cone
anode
axis
image
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
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US747103A
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English (en)
Inventor
Thaller Rudolf
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Individual
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Individual
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Filing date
Publication date
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Publication of US2097002A publication Critical patent/US2097002A/en
Anticipated expiration legal-status Critical
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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

  • the surface which emits the X-rays is the outer surface, which is uniformly bombarded with electrons, of a narrow cone made of a metal of high melting point, for example tungsten, having an apex angle of about 30 or less and having its axis at right angles to the image plane in use.
  • the effective imageforming focal surface appears substantially as a circle from every point of the image plane.
  • Fig. 1 shows the X-ray tube with parts broken away.
  • Fig. 2 explains the action of the conical anode.
  • Fig. 3 shows a detail on a large scale.
  • Fig. 4 is a section along line 4-4 of Fig. 3 on a smaller scale
  • Figs. 5 and 6 show diagrammatically other possibilities of arranging auxiliary electrodes.
  • Figs. '7 to 9 show modified details.
  • the conical anode a is secured to the anode support A which is fixed in the-glass bulb R of" the X-ray tube in sucha manner that the cone axis is at right angles to the tube axis.
  • the conical anode a may be uniformly bombarded with cathode rays (electrons) several glow cathodes n surrounding the anode a and preferably consisting of helically wound wire may be used which are arranged in a collecting device hprovided on the cathode support K.
  • the effective image-formirlglfocal surface ' is always circular although the effectivelfocal surface is the conical surface seen from abov'et Since the base circle I) of the cone is parallel 'to' the image plane, the foreshorteni-ng of .thediame'ter d as" observed from a pointon thecir'cle ids-very small. If, for example, the
  • angle or of the cone is 22*, the greatest foresho'rtening of the diameterdof the base of the cone as seen from a point on the circle I is the cone as seen from a point on the circle is less than 0.12 mm. with a cone having a base of,
  • the effective electron emitting anode area corresponding to the conical surface is more than five times the area of the base circle, thus procuring a relatively high radiating intensity as compared with the small apparent area of the focal spot, which ensures a most sharp image.
  • the cone need not have a straight generating line; this may be somewhat curved, as shown in Fig. '7, so that the conical surface is for instance a hyperboloid of revolution.
  • the cone may be cooled by radiation or by conduction. In the latter case the cone may be embedded in a material of good conductivity, such as copper. If the cone a is made hollow it may be cooled by means of a medium circulating rapidly in its interior.
  • This modification is I shown in Fig. 8, according to which the anode support A is also hollow and a tube q for supplying a cooling fluid is arranged within its hollow space p and introduced with its end into the hollow space r of the anode a, so that fluid may circulate as indicated by the arrows.
  • the collecting device illustrated consists of a drum-like metal casing h, the axis of which coincides with the axis of the cone.
  • the plain wall 2 of the casing which faces the base of the done has an opening is for the conical anode a.
  • the other end wall 7 of the casing has an opening m opposite the apex of the cone a for rays to pass out.
  • the metal casing his given a potential opposite to that of the anode. The opening it is made so large that with a high vacuum no discharge can take place directly between the anode and the casing.
  • the axes of the helical wires n which are in a plane with the axis of the cone a are parallel to the axis of the cone. They may also be inclined to it so as to intersect each other; for example they may be parallel to the opposed generating lines of the conical surface, as shown in Fig. 9.
  • the axes may run parallel to the coneaxis without the bombardment of the conical surface becoming non-uniform, whether with a small emission (currents of a few mA) or with a, very high emission (currents'up to and over 1,000 mA).
  • the glow wires 11. are shown in Fig. 3 as being connected with the drum h of the supporting device at their left hand ends. In consequence thereof they are connected in series, if their free right hand ends are connected with the terminals of the source of heating current, and have the same potential as the collecting device. A connection in parallel may be obtained, either without changing anythingin Fig. 3, by connecting the free ends of the wires with one and the same terminal of the heating current source and the drum h. with the other terminal, or by passing the left hand ends of the wires n with proper insulation through the wall of the drum h and connecting both ends of each wire directly with the terminals of the current source. In this case of course the potential of the glow wiremay be different from that of the collecting device.
  • conical surface of the anode and more particularly to. obtain a more uniform bombardment of the cone surface.
  • the drum h is preferably given, as shown in Fig. 4, an oval cross-section with the longer axis in the plane passing through the two glow wires. If more than two glow wires are used the drum is preferably made of circular cross-section. 1
  • Riintgentube comprising an envelope, an
  • anode having a focal portion in the form of .a cone, said cone having an apex angle of not more than 30, a collecting device in the form of a metal casing surrounding said cone and having a radiation opening axially opposite'the apex of the cone, and a plurality of substantially equidistant glow cathode wires arranged within said metal casing and between its shell and said anode cone and extending longitudinally of said cone.
  • 2.'R6ntgen tube as claimed in claim 1 comprising two glow cathode wires the axes of which lie approximately in a plane with the axis of the anode cone, and a plurality of auxiliary electrodes also arranged within said metal casing between its shell and the anode cone and also extending longitudinally of the cone.
  • Rontgen tube as claimed'in claim 1 comprising two glow cathode wires the axes of which a lie .approximately in a plane with the axis of the cone, said metal casing being of oval cross-sec tion with the longer axis coinciding approximately with the common plane of the cone axis and'the glow .wire axes.

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  • X-Ray Techniques (AREA)
US747103A 1934-04-14 1934-10-05 X-ray tube Expired - Lifetime US2097002A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE432154X 1934-04-14

Publications (1)

Publication Number Publication Date
US2097002A true US2097002A (en) 1937-10-26

Family

ID=6491469

Family Applications (1)

Application Number Title Priority Date Filing Date
US747103A Expired - Lifetime US2097002A (en) 1934-04-14 1934-10-05 X-ray tube

Country Status (5)

Country Link
US (1) US2097002A (ko)
BE (1) BE404912A (ko)
FR (1) FR776420A (ko)
GB (1) GB432154A (ko)
NL (1) NL40068C (ko)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677069A (en) * 1951-05-26 1954-04-27 Charles H Bachman Device for producing x-rays
US3138729A (en) * 1961-09-18 1964-06-23 Philips Electronic Pharma Ultra-soft X-ray source
US3283203A (en) * 1961-12-19 1966-11-01 Field Emission Corp X-ray tube temperature enhanced field emission cathode
US3286112A (en) * 1962-01-10 1966-11-15 Kitahama Kiyoshi X-ray tubes for microphotography
US3920999A (en) * 1972-12-05 1975-11-18 Strahlen Und Umweltforachung M X-Ray source
US20120220027A1 (en) * 2011-02-25 2012-08-30 Algenol Biofuels Inc. Magnetically Coupled System For Mixing
CN104470173A (zh) * 2013-09-18 2015-03-25 清华大学 X射线装置以及具有该x射线装置的ct设备
EP2858087A1 (en) * 2013-09-18 2015-04-08 Tsinghua University A X-Ray apparatus and a CT device having the same

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677069A (en) * 1951-05-26 1954-04-27 Charles H Bachman Device for producing x-rays
US3138729A (en) * 1961-09-18 1964-06-23 Philips Electronic Pharma Ultra-soft X-ray source
US3283203A (en) * 1961-12-19 1966-11-01 Field Emission Corp X-ray tube temperature enhanced field emission cathode
US3286112A (en) * 1962-01-10 1966-11-15 Kitahama Kiyoshi X-ray tubes for microphotography
US3920999A (en) * 1972-12-05 1975-11-18 Strahlen Und Umweltforachung M X-Ray source
US20120220027A1 (en) * 2011-02-25 2012-08-30 Algenol Biofuels Inc. Magnetically Coupled System For Mixing
US8398296B2 (en) * 2011-02-25 2013-03-19 Algenol Biofuels Inc. Magnetically coupled system for mixing
US8684592B2 (en) 2011-02-25 2014-04-01 Algenol Biofuels Inc. Magnetically coupled system for mixing
US9139805B2 (en) 2011-02-25 2015-09-22 Algenol Biotech LLC Magnetically coupled system for mixing
CN104470173A (zh) * 2013-09-18 2015-03-25 清华大学 X射线装置以及具有该x射线装置的ct设备
EP2858087A1 (en) * 2013-09-18 2015-04-08 Tsinghua University A X-Ray apparatus and a CT device having the same
JP2016537795A (ja) * 2013-09-18 2016-12-01 清華大学Ｔｓｉｎｇｈｕａ Ｕｎｉｖｅｒｓｉｔｙ Ｘ線装置及び該ｘ線装置を有するｃｔデバイス

Also Published As

Publication number Publication date
FR776420A (fr) 1935-01-25
GB432154A (en) 1935-07-22
BE404912A (ko)
NL40068C (ko)

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