US2797350A - X-ray tube - Google Patents

X-ray tube Download PDF

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Publication number
US2797350A
US2797350A US394816A US39481653A US2797350A US 2797350 A US2797350 A US 2797350A US 394816 A US394816 A US 394816A US 39481653 A US39481653 A US 39481653A US 2797350 A US2797350 A US 2797350A
Authority
US
United States
Prior art keywords
target
copper
anode
tungsten
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
US394816A
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English (en)
Inventor
Combee Bart
Houtman Jacobus Marinus
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2797350A publication Critical patent/US2797350A/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
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/112—Non-rotating anodes
    • H01J35/116—Transmissive anodes

Definitions

  • the thermal contact between the tungsten target and the copper body constitutes an important factor for the distribution of temperature in the anode. If the condition of an optimum thermal contact is not fulfilled, a smaller amount of heat is dissipated from the target and the load on the X-ray tube is required to be made lower. With unvaried load the target is unduly heated and either the material is liable to be evaporated or the tube becomes unserviceable due to flaws occurring in the target.
  • steps have been taken with the purpose to obviate the said disadvantage.
  • One of these steps is to allow the growth of large crystals behind the target.
  • An improvement could also be obtained by strengthening the copper, for which purpose a metal wool plug of a 'metal having a greater strength than copper, preferably of tungsten, was sealed directly behind the target. It has been possible in this way to obtain a satisfactory period of life considering the number of loads that the X-ray tube can endure.
  • the continuous extension of medical investigations with X-rays has the consequence that the period of time in which the X-ray tube has undergone the average number of loads is comparatively short, so that actually the tube requires to be replaced too soon. Probably the short intervals between the loads also have an unfavourable effect upon the life of the tube.
  • a copper anode for X-ray tubes comprises an electron target of tungsten constituted by a small plate of which two opposite sides are bent rectangularly or substantially rectangularly to the same side, the plate except the target area for the electrons being wholly embedded in the copper.
  • Such an anode is probably indebted for its greater strength to the fact that the copper located behind the target is enclosed between the upright edges of the target which are penetrated into the metal.
  • the movability of the copper crystals may be further decreased and the particles may be mutually anchored by sealing in known manner a plug of metal wool directly behind the tungsten plate.
  • anode In an improved form of an anode according to the invention it is ensured that the surface of that metal of the anode which embraces the target adjoins the bent edges thereof at substantially right angles.
  • the anode is constituted by the copper body 1 of cylindrical shape which has a large volume in proportion to the tungsten target 2 in order to fulfil its function as a heat-sink.
  • the target is made as small as possible in order that the path which must be traversed by the heat developed therein may be as short as possible. Since the thermal conductivity of copper is materially greater than that of tungsten, the dissipation of heat takes place more rapidly if the path to be traversed in the tungsten is shorter.
  • a long anode is also unfavorable to arrive at great uniformity in the distribution of heat as is aimed at in order to make the temperature dilferences in the anode not greater than necessary, so that the diameter of the anode, as a rule, considerably exceeds the size of the target for the electrons.
  • 3 and 4 indicate the edges of the tungsten plate which are bent backwards, furnishing a generally U-shaped member, and which edges are wholly embedded in the copper, thus enclosing the copper located in between.
  • 5 indicates the plug of metal wool which is likewise provided within that portion of the anode which is bounded by the bent edges or arms of the U-shaped target 2.
  • the heat produced in the target 2 expands in all directions.
  • the range of the highest temperature is located between the outer paths of the beam of electrons striking the exposed surface of the bight portion of the U-shaped target. Said paths are indicated in dotted line by 6 and 7.
  • the material concerned is located in a so-called dead angle in which heat is accumulated more or less due to the cross-section for the dissipation of the heat becoming narrower towards the target.
  • the anode material is removed from the said areas, which are indicated by 8 and 9 on each side of the target, so that the surface ad! joins the side-walls of the bent edges of the target at substantially right angles.
  • An anode for an X-ray tube comprising a copper, body, a U-shaped tungsten target plate whollyiembedded.
  • An anode for an X-ray-tube comprising acopper body having a givenwidth, and a tungsten target having a generally U-shaped cross-section and constituted of .a single body having arm portions extending substantially perpendicular from a common bight portion, said arm portions having a width less than said given width of the copper body, said target being embedded substantially centrally in said copper body with the arm portions facing in toward the copper body and with the outer surface of the bight portion exposed and lying substantially in a common plane with the adjacent surfaces of the copper body, said arm portions lying wholly within the copper body.

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  • X-Ray Techniques (AREA)
US394816A 1952-12-01 1953-11-27 X-ray tube Expired - Lifetime US2797350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL323748X 1952-12-01

Publications (1)

Publication Number Publication Date
US2797350A true US2797350A (en) 1957-06-25

Family

ID=19784091

Family Applications (1)

Application Number Title Priority Date Filing Date
US394816A Expired - Lifetime US2797350A (en) 1952-12-01 1953-11-27 X-ray tube

Country Status (7)

Country Link
US (1) US2797350A (US06291589-20010918-C00001.png)
BE (1) BE524719A (US06291589-20010918-C00001.png)
CH (1) CH323748A (US06291589-20010918-C00001.png)
DE (1) DE930041C (US06291589-20010918-C00001.png)
FR (1) FR1088516A (US06291589-20010918-C00001.png)
GB (1) GB732335A (US06291589-20010918-C00001.png)
NL (2) NL174265B (US06291589-20010918-C00001.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243636A (en) * 1963-01-30 1966-03-29 Tubix Soc Rotary anode for X-ray tubes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2618235C3 (de) * 1976-04-26 1983-01-13 Siemens AG, 1000 Berlin und 8000 München Röntgenröhren-Drehanode
DE3213571C1 (en) * 1982-04-13 1983-10-06 Siemens Ag Solid X-ray tube anode and process for producing it

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1218026A (en) * 1916-10-05 1917-03-06 Fred A Wiggin X-ray tube.
US1279423A (en) * 1916-09-25 1918-09-17 Pfanstiehl Company Inc X-ray target.
US1893759A (en) * 1927-01-18 1933-01-10 Philips Nv X-ray tube
US2125896A (en) * 1934-07-10 1938-08-09 Westinghouse Electric & Mfg Co Article of manufacture and method of producing the same
US2311725A (en) * 1941-04-25 1943-02-23 Gen Electric X Ray Corp X-ray tube
US2490246A (en) * 1945-11-13 1949-12-06 Gen Electric X Ray Corp Anode construction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1279423A (en) * 1916-09-25 1918-09-17 Pfanstiehl Company Inc X-ray target.
US1218026A (en) * 1916-10-05 1917-03-06 Fred A Wiggin X-ray tube.
US1893759A (en) * 1927-01-18 1933-01-10 Philips Nv X-ray tube
US2125896A (en) * 1934-07-10 1938-08-09 Westinghouse Electric & Mfg Co Article of manufacture and method of producing the same
US2311725A (en) * 1941-04-25 1943-02-23 Gen Electric X Ray Corp X-ray tube
US2490246A (en) * 1945-11-13 1949-12-06 Gen Electric X Ray Corp Anode construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243636A (en) * 1963-01-30 1966-03-29 Tubix Soc Rotary anode for X-ray tubes

Also Published As

Publication number Publication date
NL174265B (nl)
GB732335A (en) 1955-06-22
BE524719A (US06291589-20010918-C00001.png)
NL92818C (US06291589-20010918-C00001.png)
CH323748A (de) 1957-08-15
FR1088516A (fr) 1955-03-08
DE930041C (de) 1955-07-07

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