US3855492A - Vibration reduced x-ray anode - Google Patents

Vibration reduced x-ray anode Download PDF

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Publication number
US3855492A
US3855492A US00417464A US41746473A US3855492A US 3855492 A US3855492 A US 3855492A US 00417464 A US00417464 A US 00417464A US 41746473 A US41746473 A US 41746473A US 3855492 A US3855492 A US 3855492A
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US
United States
Prior art keywords
rotor
shaft
anode
molybdenum
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
US00417464A
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English (en)
Inventor
H Langer
V Sollima
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.)
Varian Medical Systems Inc
Original Assignee
Machlett Laboratories Inc
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 Machlett Laboratories Inc filed Critical Machlett Laboratories Inc
Priority to US00417464A priority Critical patent/US3855492A/en
Priority to CA210,969A priority patent/CA1004279A/en
Priority to GB4698574A priority patent/GB1461008A/en
Priority to DE2454823A priority patent/DE2454823C2/de
Application granted granted Critical
Publication of US3855492A publication Critical patent/US3855492A/en
Assigned to VARIAN ASSOCIATES, INC., A DE CORP. reassignment VARIAN ASSOCIATES, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MACHLETT LABORATORIES
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

Definitions

  • An x-ray tube of the rotating anode type comprising a rotor and bearing assembly including a rotatable rotor shaft which is connected to and supports an anode assembly for rotation therewith, the interconnected parts of the rotor and anode assemblies being substantially matched as to thermal conductivity, expansion, and yield strength at elevated temperatures and low vapor pressures, thus providing improved resistance to system imbalance which is incurred during processing and operation of the tube.
  • anode-rotor assembly is secured to the tube bearing system by means of screws which are tightened to a predetermined torque and are often secured in a manner which should eliminate loosening during heat processing.
  • screws which are tightened to a predetermined torque and are often secured in a manner which should eliminate loosening during heat processing.
  • certain mechanical changes, caused by yielding, take place and result in imbalance and high displacement levels.
  • a greatly improved bearing-target system for rotating anode x-ray tubes has been achieved by forming interconnecting portions of the system of materials which are substantially matched to possess low thermal conductivity, low thermal expansion, and high yield strength at elevated temperature and low vapor pressures. It has been found and demonstrated that materials of the iron-nickelcobalt family or alloys thereof when used for the target nosepiece, the rotor plug, the bearing nailhead, and the mounting screws, will result in greatly reduced dis placement levels during all thermal processing of an x-ray tube.
  • displacement levels are decreased by an average of about db and the system remains at a well-balanced state during the operational life of the tube.
  • the nosepiece is made from a high melting point refractory metal, preferably molybdenum or an alloy thereof such as TZM (titanium-zirconium-molybdenum alloy containing about 99.5% molybdenum).
  • TZM titanium-zirconium-molybdenum alloy containing about 99.5% molybdenum.
  • the nosepiece is brazed to the rotor plug, which plug is made of Fe-Ni- Co alloy as are the bearing nailhead and the mounting screws by which the rotor plug is secured to the bearing nailhead.
  • Rotating anode x-ray tubes having target-rotorbearing assemblies made with such matched components have shown consistently lower vibration and noise levels, both after heat processing and during operational life.
  • FIG. 1 is a side elevational view partly in axial section of an x-ray tube embodying the invention.
  • FIG. 2 is an enlarged axial sectional view of the interconnected anode-rotor-bearing assembly of the tube shown in FIG. 1.
  • FIG. 1 a rotating anode x-ray tube 10 which includes an evacuated envelope 12 having a bulb portion 14 at one end and a reduced diameter elongated neck portion 16 at its other end.
  • an electronemitting cathode 18 which is fixed by a plate 20 to one end of the cathode support 22.
  • Support 22 is sealed to the envelope in a hermetic fashion and from it extend leads 24 whereby the filament or filaments (not shown) in the cathode structure are connected to an external source of filament power.
  • the cathode and its supporting structure are not shown and described in detail since they may be conventional in construction and do not in themselves constitute an important part of this invention.
  • the cathode 18 is located so that in operation it will direct a beam of electrons onto an inclined edge portion 26 of a disclike anode target 28.
  • the target 28 is made to rotate about its axis so as to constantly present a new surface to the electron beam from the cathode 18.
  • electrons impinging upon the surface 26 will cause the generation of x-rays which will pass out of the tube through the adjacent side wall of the envelope.
  • a shaft 30 which extends longitudinally within the envelope neck portion 16, which shaft 30 is rotated by inductive means (not shown) located in encircling relation to the envelope neck portion 16.
  • Shaft 30 is mounted by ball bearing units 32 within a fixed hollow cylindrical axially extending support member 34 which is sealed at its lower end by a collar 36 to a reentrant end portion 38 of the envelope neck portion 16.
  • a tubular spacer 40 extends between the outer bearing races for location purposes.
  • the lower inner end of the bore within the support 34 is provided with a circumferential ledge 42 upon which the lower bearing outer race rests, and a set screw 44 in an upper end portion of the support 34 engages the upper edge of the upper bearing outer race for retaining the assembly in place.
  • Rotor skirt 46 Encircling the support 34 in spaced relation therewith is a rotor skirt 46 which is secured at its upper end to a rotor plug 48.
  • Rotor plug 48 is attached by mounting screws 50 to a bearing nailhead" 52.
  • Nailhead 52 is a ring-shaped element which is rigidly fixed as by brazing to a reduced upper end portion 54 of the bearing shaft 30.
  • a connecting member or nosepiece 56 has a flanged lower end which is fitted into and closely embraced by the rotor plug 48, and is brazed thereto.
  • the other end of the nosepiece 56 extends through a hole in the center of the target 28, with an enlarged flange portion 58 thereof providing a seat upon which the target rests.
  • the adjacent end of the nosepiece extends above the target surface and is threaded to receive a nut 60 by means of which the target 28 is firmly held against the flange portion 58.
  • the nosepiece 56 is preferably provided with a central bore 62 to reduce material and thereby provide a heat dam, thus reducing conductivity of heat downward through the structure and into the bearings.
  • the nosepiece 56 is made of molybdenum
  • the nailhead 52 is made of stainless steel
  • the rotor plug 48 is made of Kovar
  • the screws 50 are made of stainless steel.
  • the nosepiece 56 is made of molybdenum while the nailhead 52 is made of stainless steel
  • the rotor plug 48 and screws 50 are made of iron.
  • Assemblies of prior construction have an average of about five decibels greater displacement levels and upon becoming heated become imbalanced. Such prior assemblies also tend to increase in vibration amplitudes during the operational life of the x-ray tube, believed to be caused by comprising unmatched components.
  • the following chart illustrates in a conventional structure the linear expansion coefficient for the referred-to components in a temperature range of about from 30-600C:
  • An x-ray tube comprising an envelope containing a rigid anode supporting structure, a rotor structur rotatably mounted on said supporting structure, and an anode structure having a portion engaging and secured to a portion of said rotor structure for rotation therewith, said portion of said anode structure being titanium-zirconium-molybdenum alloy containing about 99.5% molybdenum, and the engaged portion of the rotor structure being of material in the Fe-Ni-Co family.
  • An x-ray tube of the rotating anode type comprising an evacuated envelope containing a fixed supporting structure, a rotatable shaft within said supporting structure, bearings between said shaft and supporting structure, a portion of said shaft extending beyond one end of the supporting structure, a rotor structure including a portion secured to said portion of the shaft for rotation therewith, and an anode structure including a portion secured to said rotor structure, said portion of the anode structure being of titanium-zirconium-molybdenum alloy containing about 99.5% molybdenum and the rotor structure and shaft being of materials in the Fe-Ni-Co family.
  • An x-ray tube of the rotating anode type comprising an evacuated envelope containing a hollow axially extending target support fixed at one end to said envelope, a shaft extending axially within said support and having one end extending beyond the adjacent end of the support, bearings rotatable mounting said shaft in said support, a nailhead on said end of the shaft, a rotor structure mounted on said shaft for rotation therewith 4.

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  • X-Ray Techniques (AREA)
US00417464A 1973-11-19 1973-11-19 Vibration reduced x-ray anode Expired - Lifetime US3855492A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00417464A US3855492A (en) 1973-11-19 1973-11-19 Vibration reduced x-ray anode
CA210,969A CA1004279A (en) 1973-11-19 1974-10-08 Vibration reduced x-ray anode
GB4698574A GB1461008A (en) 1973-11-19 1974-10-30 Rotating anode x-ray tube
DE2454823A DE2454823C2 (de) 1973-11-19 1974-11-19 Drehanode für Röntgenröhren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00417464A US3855492A (en) 1973-11-19 1973-11-19 Vibration reduced x-ray anode

Publications (1)

Publication Number Publication Date
US3855492A true US3855492A (en) 1974-12-17

Family

ID=23654145

Family Applications (1)

Application Number Title Priority Date Filing Date
US00417464A Expired - Lifetime US3855492A (en) 1973-11-19 1973-11-19 Vibration reduced x-ray anode

Country Status (4)

Country Link
US (1) US3855492A (de)
CA (1) CA1004279A (de)
DE (1) DE2454823C2 (de)
GB (1) GB1461008A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187442A (en) * 1978-09-05 1980-02-05 General Electric Company Rotating anode X-ray tube with improved thermal capacity
EP0051295A2 (de) * 1980-11-04 1982-05-12 Hitachi, Ltd. Röntgenröhrenvorrichtung
FR2569051A1 (fr) * 1984-08-07 1986-02-14 Thomson Csf Tube radiogene a anode tournante
US4679220A (en) * 1985-01-23 1987-07-07 Kabushiki Kaisha Toshiba X-ray tube device with a rotatable anode
US4852140A (en) * 1987-06-11 1989-07-25 Siemens Medical Systems, Inc. X-ray tube bearing arc suppressor
US4866748A (en) * 1988-08-15 1989-09-12 Varian Associates, Inc. Rotor structure brazed joint
FR2637733A1 (fr) * 1988-08-15 1990-04-13 Varian Associates Structure de rotor de tube a rayons x
US4935948A (en) * 1988-12-12 1990-06-19 General Electric Company X-ray tube noise reduction by mounting a ring mass
US5345492A (en) * 1993-01-04 1994-09-06 Eureka X-Ray Tube Corp. Rotating anode x-ray tube
US5425067A (en) * 1994-04-13 1995-06-13 Varian Associates, Inc. X-ray tube noise and vibration reduction
WO2001099142A2 (en) * 2000-06-20 2001-12-27 Varian Medical Systems, Inc. Drive assembly for an x-ray tube having a rotating anode
US6693990B1 (en) 2001-05-14 2004-02-17 Varian Medical Systems Technologies, Inc. Low thermal resistance bearing assembly for x-ray device
US20040032929A1 (en) * 2002-08-19 2004-02-19 Andrews Gregory C. X-ray tube rotor assembly having augmented heat transfer capability
US6751293B1 (en) 2001-10-05 2004-06-15 Varian Medical Systems, Inc. Rotary component support system
US6819742B1 (en) 2001-12-07 2004-11-16 Varian Medical Systems, Inc. Integrated component mounting system for use in an X-ray tube
US20060018433A1 (en) * 2004-07-26 2006-01-26 Ge Medical Systems Global Technology Company, Llc Bearing temperature and focal spot position controlled anode for a ct system
US7004635B1 (en) 2002-05-17 2006-02-28 Varian Medical Systems, Inc. Lubricated ball bearings
US20090060139A1 (en) * 2007-08-28 2009-03-05 Subraya Madhusudhana T Tungsten coated x-ray tube frame and anode assembly
US8983037B2 (en) 2009-09-30 2015-03-17 Koninklijke Philips N.V. Balancing of the rotary anode of an X-ray tube
US9159523B2 (en) 2007-08-28 2015-10-13 General Electric Company Tungsten oxide coated X-ray tube frame and anode assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE439078B (sv) * 1984-07-17 1985-05-28 Philips Norden Ab Anordning vid en avstembar magnetron
DE19858369C2 (de) * 1998-12-17 2000-10-19 Siemens Ag Drehanodenröhre mit fliegend gelagerter Drehanode, insbesondere für Computertomographieanlagen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216887A (en) * 1938-11-17 1940-10-08 Machlett Lab Inc X-ray apparatus
US2293037A (en) * 1939-07-13 1942-08-18 Gen Electric X Ray Corp Antifriction process and product
US2336271A (en) * 1941-12-23 1943-12-07 Machlett Lab Inc Rotary anode x-ray tube
US2496112A (en) * 1941-11-20 1950-01-31 Hartford Nat Bank & Trust Co X-ray tube
US3710162A (en) * 1970-02-27 1973-01-09 Radiologie Cie Gle X-ray tube having a rotary anode

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591821A (en) * 1967-04-19 1971-07-06 Tokyo Shibaura Electric Co Rotary anode type x-ray generator having emitting elements which are variably spaced from the central axis of cathode
DE2009538C3 (de) * 1970-02-28 1975-01-09 Siemens Ag, 1000 Berlin Und 8000 Muenchen Röntgenröhren-Drehanodenteller, der durch radiale Trennfugen in Sektoren unterteilt ist
DE2212058A1 (de) * 1972-03-13 1973-09-20 Siemens Ag Drehanode fuer roentgenroehren
DE2218568A1 (de) * 1972-04-17 1973-11-08 Siemens Ag Roentgenroehren-drehanode

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216887A (en) * 1938-11-17 1940-10-08 Machlett Lab Inc X-ray apparatus
US2293037A (en) * 1939-07-13 1942-08-18 Gen Electric X Ray Corp Antifriction process and product
US2496112A (en) * 1941-11-20 1950-01-31 Hartford Nat Bank & Trust Co X-ray tube
US2336271A (en) * 1941-12-23 1943-12-07 Machlett Lab Inc Rotary anode x-ray tube
US3710162A (en) * 1970-02-27 1973-01-09 Radiologie Cie Gle X-ray tube having a rotary anode

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187442A (en) * 1978-09-05 1980-02-05 General Electric Company Rotating anode X-ray tube with improved thermal capacity
DE2935222A1 (de) * 1978-09-05 1980-03-13 Gen Electric Drehanodenroentgenroehre
EP0051295A2 (de) * 1980-11-04 1982-05-12 Hitachi, Ltd. Röntgenröhrenvorrichtung
EP0051295A3 (en) * 1980-11-04 1982-09-08 Hitachi, Ltd. X-ray tube apparatus
FR2569051A1 (fr) * 1984-08-07 1986-02-14 Thomson Csf Tube radiogene a anode tournante
US4679220A (en) * 1985-01-23 1987-07-07 Kabushiki Kaisha Toshiba X-ray tube device with a rotatable anode
US4852140A (en) * 1987-06-11 1989-07-25 Siemens Medical Systems, Inc. X-ray tube bearing arc suppressor
US4866748A (en) * 1988-08-15 1989-09-12 Varian Associates, Inc. Rotor structure brazed joint
FR2637733A1 (fr) * 1988-08-15 1990-04-13 Varian Associates Structure de rotor de tube a rayons x
FR2637734A1 (fr) * 1988-08-15 1990-04-13 Varian Associates Joint brase de structure de rotor
US4969172A (en) * 1988-08-15 1990-11-06 Machlett Labs. Inc. X-ray tube rotor structure
US4935948A (en) * 1988-12-12 1990-06-19 General Electric Company X-ray tube noise reduction by mounting a ring mass
US5345492A (en) * 1993-01-04 1994-09-06 Eureka X-Ray Tube Corp. Rotating anode x-ray tube
US5425067A (en) * 1994-04-13 1995-06-13 Varian Associates, Inc. X-ray tube noise and vibration reduction
WO2001099142A2 (en) * 2000-06-20 2001-12-27 Varian Medical Systems, Inc. Drive assembly for an x-ray tube having a rotating anode
US6480571B1 (en) 2000-06-20 2002-11-12 Varian Medical Systems, Inc. Drive assembly for an x-ray tube having a rotating anode
WO2001099142A3 (en) * 2000-06-20 2002-03-28 Varian Med Sys Inc Drive assembly for an x-ray tube having a rotating anode
US6693990B1 (en) 2001-05-14 2004-02-17 Varian Medical Systems Technologies, Inc. Low thermal resistance bearing assembly for x-ray device
US6751293B1 (en) 2001-10-05 2004-06-15 Varian Medical Systems, Inc. Rotary component support system
US20050160588A1 (en) * 2001-12-07 2005-07-28 Miller Robert S. Integrated component mounting system
US7248673B2 (en) 2001-12-07 2007-07-24 Varian Medical Systems Technologies, Inc. Integrated component mounting system
US6819742B1 (en) 2001-12-07 2004-11-16 Varian Medical Systems, Inc. Integrated component mounting system for use in an X-ray tube
US7004635B1 (en) 2002-05-17 2006-02-28 Varian Medical Systems, Inc. Lubricated ball bearings
US6751292B2 (en) 2002-08-19 2004-06-15 Varian Medical Systems, Inc. X-ray tube rotor assembly having augmented heat transfer capability
US20040032929A1 (en) * 2002-08-19 2004-02-19 Andrews Gregory C. X-ray tube rotor assembly having augmented heat transfer capability
US20060018433A1 (en) * 2004-07-26 2006-01-26 Ge Medical Systems Global Technology Company, Llc Bearing temperature and focal spot position controlled anode for a ct system
US7190765B2 (en) * 2004-07-26 2007-03-13 General Electric Company Bearing temperature and focal spot position controlled anode for a CT system
US20090060139A1 (en) * 2007-08-28 2009-03-05 Subraya Madhusudhana T Tungsten coated x-ray tube frame and anode assembly
US9159523B2 (en) 2007-08-28 2015-10-13 General Electric Company Tungsten oxide coated X-ray tube frame and anode assembly
US8983037B2 (en) 2009-09-30 2015-03-17 Koninklijke Philips N.V. Balancing of the rotary anode of an X-ray tube

Also Published As

Publication number Publication date
CA1004279A (en) 1977-01-25
DE2454823C2 (de) 1985-03-07
DE2454823A1 (de) 1975-06-19
GB1461008A (en) 1977-01-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VARIAN ASSOCIATES, INC., A DE CORP., STATELESS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MACHLETT LABORATORIES;REEL/FRAME:005060/0761

Effective date: 19890129