US1893759A - X-ray tube - Google Patents

X-ray tube Download PDF

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Publication number
US1893759A
US1893759A US186522A US18652227A US1893759A US 1893759 A US1893759 A US 1893759A US 186522 A US186522 A US 186522A US 18652227 A US18652227 A US 18652227A US 1893759 A US1893759 A US 1893759A
Authority
US
United States
Prior art keywords
anticathode
cathode
tube
ray tube
metal
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
US186522A
Other languages
English (en)
Inventor
Bouwers Albert
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of US1893759A publication Critical patent/US1893759A/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
    • H01J35/24—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
    • H01J35/26—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof by rotation of the anode or anticathode
    • 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
    • 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
    • H01J35/1017—Bearings for rotating anodes
    • H01J35/1024—Rolling bearings
    • 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)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/12—Cooling
    • H01J2235/1225—Cooling characterised by method
    • H01J2235/1262—Circulating fluids
    • H01J2235/1266—Circulating fluids flow being via moving conduit or shaft

Definitions

  • the invention relates to X-ray tubes. lit is known that during the operation of an X-ray tube the anticathode becomes burnt in or is otherwise uniavorably affected when 5 the load of the focal spot exceeds a definite value.
  • the tube For preventing the anticathode from becoming burnt in, it has been proposed to rotate the X-ray tube during its operation.
  • the tube is enclosed at one of its ends in a clamping device mounted in an eccentric balhbearing, the other end of the tube being connected by a universal joint to a fixed point of support.
  • the tube When driven, the tube performs a certain conical oscillatingmovement and consequently the anticathode performs a circular movement in its plane.
  • the cathode rays are concentrated by means of a set of magnets on the desired focal point.
  • Such an installation is very complicated and the X-ray tube used therein has a short life.
  • the anticathode of an X-ray tube having an outer wall which is partly of metal is constructed so as to constitute the armature of an electric motor.
  • t e anticathode is constructed as a rotor of an induction motor the stator of 5 which is located outside the tube, the Shell of the said motor being conductively connected to the metal wall portion of the tube, which portion is grounded.
  • the cathode can be eccentrically arranged in the tube. It is quite possible, however, to accomplish the same purpose by eccentrically disposing only the aperture of the focusing device, through which the cathode rays must pass.
  • the glass portion of an X-ray tube is indicated at 1: 2 is a metal intermediate piece which preferably consists of chrome-iron be cause this alloy is not porous and can readily be sealed to glass.
  • the intermediate metal piece 2 is provided with a window 12 through which the active X-rays can emerge from the tube.
  • 3 represents that portion of an anticathode which serves to intercept the cathode-rays and which is preferably made of tungsten. This tungsten portion is secured to a cylinder which terminates in a conical end surface the outer surface of which preferably consists of copper while the inner surface consists of a metal having a great permeability and which cylinder rests on ball-bearings 6 which permit the anticathode to rotate around a shaft 5 which may be hollow for the purpose of cooling.
  • the anticathode constitutes the rotor of an induction motor, the stator of which consists of a magnet system 9 and a stator winding 11.
  • the shell 10 of the motor is connected to the metal intermediate piece 2 which is grounded.
  • the anticathode preferably consists of a copper cylinder 8, which surrounds an inner cylinder 7 made of a metal having a great permeability, for instance of iron.
  • An incandescent cathode 4 is directly connected at one of its ends to a is continually shifted with respect to the surface of the anticathode.
  • An X-ray tube having a cylindrically shaped outer envelope having mounted therein a cathode adapted to be heated to incandescence and a rotatable anticathode body, an electromagnetic stator for rotating said anticathode body mounted outside the tube, said anticathode body comprising an annular part located within the magnetic field of the said stator, said annular part comprising an outer copper portion surrounding and fixed to a form-magnetic cylinder.
  • An X-ray tube having a cylindrically shaped outer envelope enclosing a cathode adapted to be heated to incandescence, a focuss ng device surrounding said cathode and having an aperture for the passage of cathode rays, and an anticathode body, said anticathode body being rotatably mounted on a support. secured to the outer envelope centrally with respect to the tube, and means for rotating said anticathode body, said anticathode body terminat ng at the side turned to the cathode in a conical face, the aperture for the cathode rays in said focussing device being eccentrically arranged with respect to the axis of the tube.
  • an anticathode hody adapted to be used as the rotor of an induction motor and comprising an inner metal cylinder having a great magnetic permeability and an outer copper cylinder surrounding the inner cylinder.
  • a rotatable anti-cathode body comprising a cylinder of metal of great magnetic permeability, and a thin-walled copper cylinder closely surrounding said first-mentioned cylinder, and carrying a target of refractory metal.
  • An X-ray tube having an envelope, a cathode and. an anode therein. means to provide relative motion between the cathode and the anode, the said means comprising an electro-magnetic stator mounted exteriorly to the said envelope and adjacent the said anode, the said. anode having a tubular portion comprising an inner layer of iron and an outer layer of copper, a shaft arranged coaxially within said tube, and bearing elements between said shaft and said tubular portion, for the rotatable support of said anode.
  • An X-ray tube having a cylindrically shaped outer envelope consisting partly of metal and having mounted therein a cathode adapted to be heated to incandescence and a rotatable anticathode body, and means for providing relative motion etween said cathode and said anticathode body, said means comprising an electro-magnetic stator mounted outside the tube adjacent the anticathode body and conductively connected to the metal wall portion of the tube and forming together with the anticathode body and an induction motor, the anticathode body constituting the rotor of the motor and being for the greater part located in the magnetic field of said stator.
  • An X-ray tube having a cylindrically shaped outer envelope partly consisting of metal and enclosing a cathode adapted to be heated to incandescence and an anticathode body, said anticathode body being rotatably mounted on a support secured to the outer envelope centrally with respect to the tube, and comprising a head portion carrying a target and continuing at the side turned away from the cathode in an annular portion surrounding the said support, said tube having mcans for rotating the anticathode body, said means comprising an electric-magnetic stator mounted outside the tube adjacent the said annular portion of the anticathode body and conductively connected to the metallic wall portion of the tube and forming together with the anticathode body an induction motor, the rotor of which is constituted by the .anticathode body and comprises a magnetizable body.
  • An X-ray tube comprising an envelope, having mounted therein a cathode and an anticathode body disposed to rotate on the axis of the envelope, said anticathode body terminating in a front piece having a conical ray-emitting surface located opposite to said cathode, said cathode having an axis arranged eccentrically but substantially parallel with respect to the axis of the envelope, and means to continuously rotate the anticathode body.
  • An X-ray tube having an outer envelope, a cathode and an anode therein, means for providing relative motion between the cathode and the anode, the said means comprising an electro-magnetic stator, mounted exteriorly to the said outer envelope and adjacent the said anode, the said anode comprising a tubular cylindrical body formed of magnetically permeable material and having means defining portions of ball races therein, a second cylindrical-body encircling the first cylindrical body and having a target mounted in the end thereof adjacent the said cathode: and a supporting member surrounded. by said tubular cylindrical body of said anode, means on said member forming the inner portion of the ball races, and balls in said races.
  • an anticathode comprising a rotor an induction motor, and compnsing a magnetic portion surrounded by a. jacket formed of meterial of high electrical conductivity, and a. target of highly refractory metal carried thereby.

Landscapes

  • X-Ray Techniques (AREA)
  • Sliding-Contact Bearings (AREA)
  • Lubricants (AREA)
US186522A 1927-01-18 1927-04-25 X-ray tube Expired - Lifetime US1893759A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL35727A NL24781C (de) 1927-01-18 1927-01-18
NL45957A NL31411C (de) 1927-01-18 1929-04-19

Publications (1)

Publication Number Publication Date
US1893759A true US1893759A (en) 1933-01-10

Family

ID=33566891

Family Applications (2)

Application Number Title Priority Date Filing Date
US186522A Expired - Lifetime US1893759A (en) 1927-01-18 1927-04-25 X-ray tube
US435581A Expired - Lifetime US1977275A (en) 1927-01-18 1930-03-13 X-ray tube

Family Applications After (1)

Application Number Title Priority Date Filing Date
US435581A Expired - Lifetime US1977275A (en) 1927-01-18 1930-03-13 X-ray tube

Country Status (9)

Country Link
US (2) US1893759A (de)
AT (1) AT138948B (de)
BE (3) BE372145A (de)
CH (2) CH124857A (de)
DE (3) DE559089C (de)
DK (1) DK44675C (de)
FR (2) FR633598A (de)
GB (2) GB286436A (de)
NL (2) NL24781C (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718605A (en) * 1950-08-28 1955-09-20 Fenner Eckhard Electrical discharge tube
US2797350A (en) * 1952-12-01 1957-06-25 Philips Corp X-ray tube
US3331978A (en) * 1962-05-28 1967-07-18 Varian Associates Electron beam x-ray generator with movable, fluid-cooled target
US4811375A (en) * 1981-12-02 1989-03-07 Medical Electronic Imaging Corporation X-ray tubes
US4920551A (en) * 1985-09-30 1990-04-24 Kabushiki Kaisha Toshiba Rotating anode X-ray tube
EP1120808A2 (de) * 1999-12-02 2001-08-01 Lohmann X-Ray GmbH Röntgenröhre mit Kerndrehanode
WO2010070574A1 (en) 2008-12-17 2010-06-24 Koninklijke Philips Electronics N.V. Attachment of a high-z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL52715C (de) * 1937-08-02
DE765667C (de) * 1937-08-20 1954-04-05 Mueller C H F Ag Roentgenroehre
US2430800A (en) * 1943-10-02 1947-11-11 Gen Electric X Ray Corp Rotating anode construction
DE923312C (de) * 1950-08-19 1955-02-10 Siemens Reiniger Werke Ag Elektrische Hochvakuum-Entladungsroehre mit drehbar gelagerter Elektrode
DE2607618A1 (de) * 1976-02-25 1977-09-01 Philips Patentverwaltung Roentgenroehre

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718605A (en) * 1950-08-28 1955-09-20 Fenner Eckhard Electrical discharge tube
US2797350A (en) * 1952-12-01 1957-06-25 Philips Corp X-ray tube
US3331978A (en) * 1962-05-28 1967-07-18 Varian Associates Electron beam x-ray generator with movable, fluid-cooled target
US4811375A (en) * 1981-12-02 1989-03-07 Medical Electronic Imaging Corporation X-ray tubes
US4920551A (en) * 1985-09-30 1990-04-24 Kabushiki Kaisha Toshiba Rotating anode X-ray tube
EP1120808A2 (de) * 1999-12-02 2001-08-01 Lohmann X-Ray GmbH Röntgenröhre mit Kerndrehanode
EP1120808A3 (de) * 1999-12-02 2001-09-19 Lohmann X-Ray GmbH Röntgenröhre mit Kerndrehanode
WO2010070574A1 (en) 2008-12-17 2010-06-24 Koninklijke Philips Electronics N.V. Attachment of a high-z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target
US8553843B2 (en) 2008-12-17 2013-10-08 Koninklijke Philips N.V. Attachment of a high-Z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target

Also Published As

Publication number Publication date
AT138948B (de) 1934-10-10
US1977275A (en) 1934-10-16
GB286436A (en) 1928-03-08
NL24781C (de) 1931-09-15
CH124857A (de) 1928-03-01
DE599029C (de) 1934-06-23
GB344692A (en) 1931-03-12
CH148896A (de) 1931-08-15
DK44675C (da) 1931-10-05
BE341624A (de)
DE559089C (de) 1932-09-15
FR633598A (fr) 1928-01-31
FR38180E (fr) 1931-04-21
BE372145A (de)
DE567674C (de) 1933-01-07
NL31411C (de) 1933-12-15
BE368929A (de)

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