US2939015A - X-ray tube - Google Patents

X-ray tube Download PDF

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Publication number
US2939015A
US2939015A US652413A US65241357A US2939015A US 2939015 A US2939015 A US 2939015A US 652413 A US652413 A US 652413A US 65241357 A US65241357 A US 65241357A US 2939015 A US2939015 A US 2939015A
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US
United States
Prior art keywords
envelope
stator
ray tube
anode
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
US652413A
Inventor
Reiniger Friedrich
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 US2939015A publication Critical patent/US2939015A/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
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/04—Mounting the X-ray tube within a closed housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/10—Drive means for anode (target) substrate
    • H01J2235/1026—Means (motors) for driving the target (anode)

Definitions

  • X-ray tubes are frequently disposed in a closed envelope made wholly or substantially of metal.
  • the envelope acquires earth potential and must be perfectly insulated with respect to the tube.
  • the space between the Wall of the tube and the envelope is filled with oil.
  • the envelope also contains the stator, which serves to drive the rotary anode and which is likewise contained in the space filled with oil.
  • the stator of the rotaryanode tube is cast in cast resin before being introduced into the envelope.
  • the material known under the name Araldite Araldite.
  • a very suitable method is to add to the cast material about 50% by volume of quartz, so that stress due to contraction which may occur in the object after casting is substantially avoided. Furthermore, it is thus achieved that the power of dissipating heat from the enclosed winding is increased with respect to ordinary cast resin.
  • An envelope substantially cylindrical in shape, carries at each extremity a declaration cap 1*, respectively 1
  • the Wall of the envelope has a window 2 from which the X-rays emanate which are produced in an X-ray tube 5.
  • the latter comprises a cathode 3 and a rotatably arranged anode 4.
  • the high tension is sup- 2,939,015 Patented May 31, 1960 plied via cables which are connected to the envelope in known manner by means of plug sockets 6.
  • the stator which, upon energisation, provides the electric field driving the anode 4 is disposed between the wall of the X-ray tube and the envelope.
  • a stator core 7 and its winding 8 are cast in cast resin 9 which preferably contains about 50% by volume of quartz.
  • the surface of the cast workpiece may be perfectly smooth, so that. the air is expelled throughout when the envelope is filled with oil.
  • the figure also shows a convenient method of securing the stator;
  • the wall 13 of insulating material which closes the anode end of the envelope 1, is provided with an annular upright edge 10.
  • the edge 10 extends in the envelope and its extremity carries the stator.
  • the Wall 13 with its upright edge 10 and the stator may be united to form one casting.
  • the wall 13 also supports the X-ray tube 5 by means of a supporting cap 11 which for this purpose is cast in the wall.
  • Lead-through devices 12 for the supply wires of the stator Winding 8 are likewise provided in the Wall 13.
  • An X-ray tube comprising an oil-filled envelope, a motor stator completely disposed in the oil-filled envelope for cooperating with and driving a rotary anode, and a smooth-surfaced insulating member completely surrounding and enclosing the stator to minimize the possibility of air bubbles remaining in the envelope after it is filled with the oil.
  • an X-ray tube of the type comprising a rotary anode, a motor stator for driving the anode, and an oilfilled envelope surrounding and enveloping the stator, the improvement comprising completely embedding the stator in a casting resin so as to provide a smooth exterior and minimize the possibility of entrapping air when the envelope is filled with the oil.
  • An X-ray tube comprising a rotary anode, a motor stator for driving the anode, an oil-filled envelope enclosing the stator, and a cast resin member having a lower portion completely enclosing the stator and an upper portion constituted of an annular upright edge secured to the envelope and thus serving to support the stator.

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  • X-Ray Techniques (AREA)

Description

F. REINIGER May 31, 1960 X-RAY TUBE Filed April 12, 1957 INVENTOR FRIEDRICH REINIGER AGENT United States Patent X-RAY TUBE Friedrich Reiniger, Hamburg, Germany, assignor to North American Philips Company, Inc., Irvington-on- Hudson, NY.
Filed Apr. 12, 1957, Ser. No. 652,413
Claims priority, application Germany May 8, 1956 Claims. (Cl. 250-90) X-ray tubes are frequently disposed in a closed envelope made wholly or substantially of metal. When the tube is made operative, the envelope acquires earth potential and must be perfectly insulated with respect to the tube. For this purpose the space between the Wall of the tube and the envelope is filled with oil.
In rotary-anode tubes the envelope also contains the stator, which serves to drive the rotary anode and which is likewise contained in the space filled with oil.
It may happen that the oil-filling does not provide suflicient insulation and in time electric discharge occurring in the envelope deteriorates the tube. This is attributable to small air bubbles remaining in the envelope. Thus, when filling the envelope, it is necessary to proceed very carefully in order to avoid the inclusion of air. A rotary-anode tube causes greater difiiculty in this respect than ordinary X-ray tubes, since the surface of the stator is usually not perfectly smooth, resulting in small-air-chambers which are not filled with oil even if the air is expelled by heating and evacuation of the envelope.
The object of the invention is to obviate said disadvantage. According to the invention, the stator of the rotaryanode tube is cast in cast resin before being introduced into the envelope. For this purpose use may be made of the material known under the name Araldite. A very suitable method is to add to the cast material about 50% by volume of quartz, so that stress due to contraction which may occur in the object after casting is substantially avoided. Furthermore, it is thus achieved that the power of dissipating heat from the enclosed winding is increased with respect to ordinary cast resin.
In order that the invention may be readily carried into effect, it will now be described more fully, by way of example, with reference to the accompanying drawing, showing one embodiment of a rotary-anode X-ray tube with stator provided with an envelope to which the in vention is applied.
An envelope 1, substantially cylindrical in shape, carries at each extremity a declaration cap 1*, respectively 1 The Wall of the envelope has a window 2 from which the X-rays emanate which are produced in an X-ray tube 5. The latter comprises a cathode 3 and a rotatably arranged anode 4. The high tension is sup- 2,939,015 Patented May 31, 1960 plied via cables which are connected to the envelope in known manner by means of plug sockets 6. The stator which, upon energisation, provides the electric field driving the anode 4 is disposed between the wall of the X-ray tube and the envelope. A stator core 7 and its winding 8 are cast in cast resin 9 which preferably contains about 50% by volume of quartz. The surface of the cast workpiece may be perfectly smooth, so that. the air is expelled throughout when the envelope is filled with oil. The figure also shows a convenient method of securing the stator; For this purpose, the wall 13 of insulating material, which closes the anode end of the envelope 1, is provided with an annular upright edge 10. The edge 10 extends in the envelope and its extremity carries the stator. The Wall 13 with its upright edge 10 and the stator may be united to form one casting. The wall 13 also supports the X-ray tube 5 by means of a supporting cap 11 which for this purpose is cast in the wall. Lead-through devices 12 for the supply wires of the stator Winding 8 are likewise provided in the Wall 13.
What is claimed is:
1. An X-ray tube comprising an oil-filled envelope, a motor stator completely disposed in the oil-filled envelope for cooperating with and driving a rotary anode, and a smooth-surfaced insulating member completely surrounding and enclosing the stator to minimize the possibility of air bubbles remaining in the envelope after it is filled with the oil.
2. In an X-ray tube of the type comprising a rotary anode, a motor stator for driving the anode, and an oilfilled envelope surrounding and enveloping the stator, the improvement comprising completely embedding the stator in a casting resin so as to provide a smooth exterior and minimize the possibility of entrapping air when the envelope is filled with the oil.
3. The X-ray tube as claimed in claim 2, wherein the casting resin contains about 50% by volume of quartz.
4. An X-ray tube comprising a rotary anode, a motor stator for driving the anode, an oil-filled envelope enclosing the stator, and a cast resin member having a lower portion completely enclosing the stator and an upper portion constituted of an annular upright edge secured to the envelope and thus serving to support the stator.
5. A tube as claimed in claim 4 wherein the upper portion of the cast resin member includes a wall member secured to and supporting the anode portion of the tube.
References Cited in the file of this patent UNITED STATES PATENTS 1,662,891 Mutscheller Mar. 20, 1928 1,933,005 Bouwers Oct. 31, 1933 2,118,457 Bouwers May 24, 1938 2,121,630 Gross et al June 21, 1938 2,216,888 Machlett Oct. 8, 1940 2,222,729 Ver Planck et a1. Nov. 26, 1940 2,307,612 Westendorp Jan. 5, 1943 2,601,042 Marks June 17, 1952
US652413A 1956-05-08 1957-04-12 X-ray tube Expired - Lifetime US2939015A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE813883X 1956-05-08

Publications (1)

Publication Number Publication Date
US2939015A true US2939015A (en) 1960-05-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
US652413A Expired - Lifetime US2939015A (en) 1956-05-08 1957-04-12 X-ray tube

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US (1) US2939015A (en)
FR (1) FR1174576A (en)
GB (1) GB813883A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024424A (en) * 1974-11-27 1977-05-17 U.S. Philips Corporation Rotary-anode X-ray tube
US4188559A (en) * 1977-07-29 1980-02-12 Compagnie Generale De Radiologie Rotary anode X-ray tube
EP1182740A3 (en) * 2000-08-18 2002-10-23 Marconi Medical Systems, Inc. Releasable electrical coupling
US20050201520A1 (en) * 2004-03-11 2005-09-15 Varian Medical Systems Technologies, Inc. Encapsulated stator assembly for an x-ray tube

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1662891A (en) * 1921-01-14 1928-03-20 Mutscheller Arthur Combined vacuum tube and transformer
US1933005A (en) * 1929-05-16 1933-10-31 Philips Nv X-ray tube
US2118457A (en) * 1932-12-23 1938-05-24 Philips Nv X-ray apparatus
US2121630A (en) * 1936-05-11 1938-06-21 Gen Electric X Ray Corp X-ray apparatus
US2216888A (en) * 1939-07-19 1940-10-08 Machlett Lab Inc X-ray tube
US2222729A (en) * 1936-12-05 1940-11-26 Gen Electric Resin-containing composite structure
US2307612A (en) * 1941-02-18 1943-01-05 Gen Electric High voltage apparatus
US2601042A (en) * 1949-09-17 1952-06-17 Gen Electric Transformer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1662891A (en) * 1921-01-14 1928-03-20 Mutscheller Arthur Combined vacuum tube and transformer
US1933005A (en) * 1929-05-16 1933-10-31 Philips Nv X-ray tube
US2118457A (en) * 1932-12-23 1938-05-24 Philips Nv X-ray apparatus
US2121630A (en) * 1936-05-11 1938-06-21 Gen Electric X Ray Corp X-ray apparatus
US2222729A (en) * 1936-12-05 1940-11-26 Gen Electric Resin-containing composite structure
US2216888A (en) * 1939-07-19 1940-10-08 Machlett Lab Inc X-ray tube
US2307612A (en) * 1941-02-18 1943-01-05 Gen Electric High voltage apparatus
US2601042A (en) * 1949-09-17 1952-06-17 Gen Electric Transformer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024424A (en) * 1974-11-27 1977-05-17 U.S. Philips Corporation Rotary-anode X-ray tube
US4188559A (en) * 1977-07-29 1980-02-12 Compagnie Generale De Radiologie Rotary anode X-ray tube
EP1182740A3 (en) * 2000-08-18 2002-10-23 Marconi Medical Systems, Inc. Releasable electrical coupling
US20050201520A1 (en) * 2004-03-11 2005-09-15 Varian Medical Systems Technologies, Inc. Encapsulated stator assembly for an x-ray tube
US7203281B2 (en) * 2004-03-11 2007-04-10 Varian Medical Systems, Inc. Encapsulated stator assembly for an x-ray tube

Also Published As

Publication number Publication date
FR1174576A (en) 1959-03-12
GB813883A (en) 1959-05-27

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