EP0059238B1 - X-ray tube - Google Patents

X-ray tube Download PDF

Info

Publication number
EP0059238B1
EP0059238B1 EP81108428A EP81108428A EP0059238B1 EP 0059238 B1 EP0059238 B1 EP 0059238B1 EP 81108428 A EP81108428 A EP 81108428A EP 81108428 A EP81108428 A EP 81108428A EP 0059238 B1 EP0059238 B1 EP 0059238B1
Authority
EP
European Patent Office
Prior art keywords
tube
screen
anode
glass
insulating
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
Application number
EP81108428A
Other languages
German (de)
French (fr)
Other versions
EP0059238A1 (en
Inventor
Rudolf Dipl.-Phys. Friedel
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.)
Siemens AG
Original Assignee
Siemens AG
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
Priority to DE3107949 priority Critical
Priority to DE19813107949 priority patent/DE3107949A1/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0059238A1 publication Critical patent/EP0059238A1/en
Application granted granted Critical
Publication of EP0059238B1 publication Critical patent/EP0059238B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00X-ray tubes
    • H01J35/02Details
    • H01J35/16Vessels; Containers; Shields associated therewith
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00X-ray tubes
    • H01J2235/16Vessels
    • H01J2235/165Shielding arrangements
    • H01J2235/168Shielding arrangements against charged particles

Description

  • The invention relates to an X-ray tube according to the preamble of claim 1. Such an X-ray tube is known from the publication "Progress in the field of X-rays", Volume XXXIII, Issue 4 (1925), pages 575/576.
  • In the known tube, the tube housing and the shield were at the same potential, so that a breakdown through the glass tube bulb was largely prevented. In addition, the shielding caught electrons, which led to a deterioration in the achievable X-ray beam. However, it was disadvantageous that a difficult and expensive glass technology was necessary on the one hand, and on the other hand with today's high tube outputs and tube energies, the shielding, which is inevitably thermally largely insulated with this design, is heated to an impermissibly high level.
  • The object of the invention is to enable an x-ray tube according to the preamble of claim 1 in addition to an improvement in the dielectric strength and a manufacturing-friendly structure focal near blanking and to achieve increased anode load capacity. This object is achieved according to the invention by the measures specified in the characterizing part of claim 1. Advantageous further developments and refinements of the invention are the subject of the dependent claims.
  • By using means by which the shielding is kept at a potential which is greater than half the tube voltage but less than the anode potential, the solution to the above problem is that a larger part of the backscattered electrons than known tubes is removed from the focal spot becomes, which increases the anode load capacity. In addition, the proportion of extravocal radiation in the useful beam is reduced. Furthermore, a very close-to-focus blanking of the radiation cone is possible because the potential difference between the screen and the anode is smaller and therefore the distance between the focus and the aperture can be smaller than in previously used arrangements.
  • The shielding according to the invention can advantageously be held on a metal ring which is concentric with the discharge space. The metal ring can carry an insulating part at one end to which the cathode is attached and an insulating part at its other end which carries the anode. Using known advantageous techniques, the insulating parts can be made of glass so that the usual glass blowing technique can be used.
  • The shield usually takes the form of a cylinder, which encloses both the cathode and the anode. The resulting largely metallic discharge space prevents the glass wall of the tube bulb from being hit by electrons and metal vapor deposits. In addition, long insulation distances are guaranteed, which guarantee high high-voltage strength.
  • Further details and advantages of the invention are explained below with reference to the embodiment shown in the drawing.
  • In the exemplary embodiment of a rotating anode X-ray tube 1 shown in section, 2 denotes a metal ring made of Vacon, which has the shape of an approximately 15 mm long piece of pipe, the wall of which is 1 mm thick and which is connected at one end to a glass part 3, on the inside of which a cathode arrangement 4 is attached. At its other end, the metal ring carries a glass part 5, which at its end has an anode arrangement 6, which consists of an anode plate 7, which via a shaft 8 carries a rotor 9, which connects to the connecting piece fixed to the glass part 5 10. On the inside of the ring 2, a shield 11 is attached, which is fixed in the tube 1 via holding connections 12. In the present example, a copper (Cu) sheet which is 1.5 mm thick is used as shielding. Other sheets, such as those made of nickel or stainless steel are suitable if they are stable under the conditions in the tube.
  • To generate X-rays, a heating current is applied between lines 20 and 21 in a manner known per se, which causes the cathode 22 to glow. In addition, the tube voltage is applied to the tube via one of the lines 20 or 21 and the connector 10, so that an electron current 23 strikes a focal spot path 24 of the anode plate 7. As a result, an X-ray cone 25 is generated, which exits through a window 26 in the shield 11 and a window 27 in the tube bulb. The two windows 26 and 27 advantageously consist of beryllium and represent 0.5 mm thick foils which are inserted into corresponding openings in the shield 11 or the wall 5 of the glass bulb part.

Claims (5)

1. An X-ray tube having a screen which laterally embraces the discharge space which is arranged between the anode and the cathode, characterised in that means are provided by means of which the screen (11) is maintained at a potential which is greater than half of and less than the full anode potential.
2. A tube as claimed in Claim 1, characterised in that the screen surrounds the discharge space in that it also has defining parts in the radial direction.
3. A tube as claimed in Claim 1, characterised in that the screen (11) has a holder which acts upon an annular component (2) which is concentrically arranged with respect to the tube axis and is made of metal and which on one side borders on an insulating member (3) which supports the cathode arrangement (4), and on the other side borders on an insulating member (5) which supports the anode arrangement (6).
4. A tube as claimed in Claim 3, characterised in that the insulating members are made of glass.
5. A tube as claimed in Claim 1, characterised in that the screen (11) and the ring (2) are made of a highly heat-conducting material.
EP81108428A 1981-03-02 1981-10-16 X-ray tube Expired EP0059238B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3107949 1981-03-02
DE19813107949 DE3107949A1 (en) 1981-03-02 1981-03-02 X-ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT81108428T AT17802T (en) 1981-03-02 1981-10-16 X-ray tubes.

Publications (2)

Publication Number Publication Date
EP0059238A1 EP0059238A1 (en) 1982-09-08
EP0059238B1 true EP0059238B1 (en) 1986-01-29

Family

ID=6126181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108428A Expired EP0059238B1 (en) 1981-03-02 1981-10-16 X-ray tube

Country Status (4)

Country Link
US (1) US4468802A (en)
EP (1) EP0059238B1 (en)
AT (1) AT17802T (en)
DE (1) DE3107949A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008020163A1 (en) 2008-04-22 2009-10-29 Siemens Aktiengesellschaft Cathode has incandescent emitter made from material, which emits electrons thermally, where emission layer is applied partially or completely on incandescent emitter

Families Citing this family (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964148A (en) * 1987-11-30 1990-10-16 Meicor, Inc. Air cooled metal ceramic x-ray tube construction
US5056126A (en) * 1987-11-30 1991-10-08 Medical Electronic Imaging Corporation Air cooled metal ceramic x-ray tube construction
US5136625A (en) * 1991-10-18 1992-08-04 Varian Associates, Inc. Metal center x-ray tube
US5384820A (en) * 1992-01-06 1995-01-24 Picker International, Inc. Journal bearing and radiation shield for rotating housing and anode/stationary cathode X-ray tubes
DE4429910B4 (en) * 1994-01-11 2006-06-29 Siemens Ag X-ray tube with shielding part
GB9519715D0 (en) * 1995-09-27 1995-11-29 Kevex X Ray Inc X-ray tube
DE19542438C1 (en) * 1995-11-14 1996-11-28 Siemens Ag X=ray tube with vacuum housing having cathode and anode
DE19627025C2 (en) * 1996-07-04 1998-05-20 Siemens Ag X-ray tube
US7079624B1 (en) 2000-01-26 2006-07-18 Varian Medical Systems, Inc. X-Ray tube and method of manufacture
US6749337B1 (en) * 2000-01-26 2004-06-15 Varian Medical Systems, Inc. X-ray tube and method of manufacture
US6619842B1 (en) * 1997-08-29 2003-09-16 Varian Medical Systems, Inc. X-ray tube and method of manufacture
US6005918A (en) * 1997-12-19 1999-12-21 Picker International, Inc. X-ray tube window heat shield
DE19842467A1 (en) * 1998-09-16 2000-03-23 Siemens Ag Miniature X-ray tube for insertion into narrow objects, especially vessel systems in living tissue
AU9661101A (en) * 2000-10-23 2002-05-06 Varian Med Sys Inc X-ray tube and method of manufacture
US6570962B1 (en) * 2002-01-30 2003-05-27 Koninklijke Philips Electronics N.V. X-ray tube envelope with integral corona shield
US7209546B1 (en) 2002-04-15 2007-04-24 Varian Medical Systems Technologies, Inc. Apparatus and method for applying an absorptive coating to an x-ray tube
US8275091B2 (en) 2002-07-23 2012-09-25 Rapiscan Systems, Inc. Compact mobile cargo scanning system
US7963695B2 (en) 2002-07-23 2011-06-21 Rapiscan Systems, Inc. Rotatable boom cargo scanning system
US8837669B2 (en) 2003-04-25 2014-09-16 Rapiscan Systems, Inc. X-ray scanning system
US8094784B2 (en) * 2003-04-25 2012-01-10 Rapiscan Systems, Inc. X-ray sources
US8451974B2 (en) 2003-04-25 2013-05-28 Rapiscan Systems, Inc. X-ray tomographic inspection system for the identification of specific target items
GB0309374D0 (en) * 2003-04-25 2003-06-04 Cxr Ltd X-ray sources
US8243876B2 (en) 2003-04-25 2012-08-14 Rapiscan Systems, Inc. X-ray scanners
US9208988B2 (en) 2005-10-25 2015-12-08 Rapiscan Systems, Inc. Graphite backscattered electron shield for use in an X-ray tube
US9113839B2 (en) 2003-04-25 2015-08-25 Rapiscon Systems, Inc. X-ray inspection system and method
GB0309387D0 (en) * 2003-04-25 2003-06-04 Cxr Ltd X-Ray scanning
GB0309383D0 (en) 2003-04-25 2003-06-04 Cxr Ltd X-ray tube electron sources
US8223919B2 (en) 2003-04-25 2012-07-17 Rapiscan Systems, Inc. X-ray tomographic inspection systems for the identification of specific target items
GB0309371D0 (en) * 2003-04-25 2003-06-04 Cxr Ltd X-Ray tubes
GB0309379D0 (en) * 2003-04-25 2003-06-04 Cxr Ltd X-ray scanning
US10483077B2 (en) 2003-04-25 2019-11-19 Rapiscan Systems, Inc. X-ray sources having reduced electron scattering
JP2007504634A (en) * 2003-05-30 2007-03-01 コニンクリユケ フィリップス エレクトロニクス エヌ.ブイ. Enhanced electron backscattering in X-ray tubes
US6928141B2 (en) 2003-06-20 2005-08-09 Rapiscan, Inc. Relocatable X-ray imaging system and method for inspecting commercial vehicles and cargo containers
US7471764B2 (en) 2005-04-15 2008-12-30 Rapiscan Security Products, Inc. X-ray imaging system having improved weather resistance
US7949101B2 (en) 2005-12-16 2011-05-24 Rapiscan Systems, Inc. X-ray scanners and X-ray sources therefor
GB0525593D0 (en) 2005-12-16 2006-01-25 Cxr Ltd X-ray tomography inspection systems
GB0803641D0 (en) 2008-02-28 2008-04-02 Rapiscan Security Products Inc Scanning systems
GB0803644D0 (en) 2008-02-28 2008-04-02 Rapiscan Security Products Inc Scanning systems
US20090284124A1 (en) * 2008-04-22 2009-11-19 Wolfgang Kutschera Cathode composed of materials with different electron works functions
GB0809110D0 (en) 2008-05-20 2008-06-25 Rapiscan Security Products Inc Gantry scanner systems
GB0812864D0 (en) 2008-07-15 2008-08-20 Cxr Ltd Coolign anode
DE102008038569A1 (en) * 2008-08-20 2010-02-25 Siemens Aktiengesellschaft X-ray tube
GB0816823D0 (en) 2008-09-13 2008-10-22 Cxr Ltd X-ray tubes
GB0901338D0 (en) 2009-01-28 2009-03-11 Cxr Ltd X-Ray tube electron sources
US9046465B2 (en) 2011-02-24 2015-06-02 Rapiscan Systems, Inc. Optimization of the source firing pattern for X-ray scanning systems
US9218933B2 (en) 2011-06-09 2015-12-22 Rapidscan Systems, Inc. Low-dose radiographic imaging system
BR112014013226A2 (en) 2013-01-31 2017-06-13 Rapiscan Systems Inc portable security inspection system
JP1528933S (en) * 2014-09-25 2015-07-13
JP1529492S (en) * 2014-09-25 2015-07-21
JP1528467S (en) * 2014-09-25 2015-07-13
JP1528468S (en) * 2014-09-25 2015-07-13
JP1528934S (en) * 2014-09-25 2015-07-13
JP1528466S (en) * 2014-09-25 2015-07-13

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE559352C (en) * 1930-10-14 1932-09-19 Philips Nv X-ray tube with a metallic central part or metallic coating on the tube wall
DE612213C (en) * 1931-07-26 1935-04-16 Mueller C H F Ag Entladungsgefaess, particularly x-ray tube, with pure electron discharge
US2952790A (en) * 1957-07-15 1960-09-13 Raytheon Co X-ray tubes
US3916202A (en) * 1974-05-03 1975-10-28 Gen Electric Lens-grid system for electron tubes
US4309637A (en) * 1979-11-13 1982-01-05 Emi Limited Rotating anode X-ray tube

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Fortschritte auf dem Gebiete der Röntgenstrahlen, Band XXXIII Heft 4, Seiten 575, 576 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008020163A1 (en) 2008-04-22 2009-10-29 Siemens Aktiengesellschaft Cathode has incandescent emitter made from material, which emits electrons thermally, where emission layer is applied partially or completely on incandescent emitter

Also Published As

Publication number Publication date
EP0059238A1 (en) 1982-09-08
DE3107949A1 (en) 1982-09-16
US4468802A (en) 1984-08-28
AT17802T (en) 1986-02-15

Similar Documents

Publication Publication Date Title
CN103718653B (en) Lonizing radiation generator and radiation imaging apparatus
KR101581313B1 (en) Target structure and x-ray generating apparatus
US6490340B1 (en) X-ray generating apparatus
US9281155B2 (en) Radiation generating apparatus and radiation imaging apparatus
CN103765547B (en) X ray generator and x-ray imaging device
EP0096824B1 (en) Fine focus x-ray tube and method for the production of a finely focused electron emission from an x-ray filament cathode
US3679927A (en) High power x-ray tube
EP0924742B1 (en) Means for preventing excessive heating of an X-ray tube window
JP6039283B2 (en) Radiation generator and radiation imaging apparatus
US4250425A (en) Rotating anode X-ray tube for tomodensitometers
US5105456A (en) High duty-cycle x-ray tube
JP2013051164A (en) Transmission x-ray generator
JP5713832B2 (en) Radiation generator and radiation imaging apparatus using the same
JP2713860B2 (en) X-ray tube device
US5633907A (en) X-ray tube electron beam formation and focusing
US5689541A (en) X-ray tube wherein damage to the radiation exit window due to back-scattered electrons is avoided
EP0110734A2 (en) X-ray tube generating a high power beam, particularly a collimated beam
US4184097A (en) Internally shielded X-ray tube
US20130016811A1 (en) Radiation generating apparatus and radiation imaging apparatus
US2569872A (en) Electron discharge tube
US2291948A (en) High voltage X-ray tube shield
US20010007587A1 (en) X-ray tube
US4075526A (en) Hot-cathode x-ray tube having an end-mounted anode
US9514911B2 (en) X-ray tube aperture body with shielded vacuum wall
US9530528B2 (en) X-ray tube aperture having expansion joints

Legal Events

Date Code Title Description
AK Designated contracting states

Designated state(s): AT CH DE FR

17P Request for examination filed

Effective date: 19811016

AK Designated contracting states

Designated state(s): AT CH DE FR LI

REF Corresponds to:

Ref document number: 17802

Country of ref document: AT

Date of ref document: 19860215

Kind code of ref document: T

Format of ref document f/p: P

REF Corresponds to:

Ref document number: 3173649

Country of ref document: DE

Date of ref document: 19860313

Format of ref document f/p: P

ET Fr: translation filed
26N No opposition filed
PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: AT

Payment date: 19920918

Year of fee payment: 12

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: FR

Payment date: 19921016

Year of fee payment: 12

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: DE

Payment date: 19921216

Year of fee payment: 12

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: CH

Payment date: 19930121

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19931016

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19931031

Ref country code: LI

Effective date: 19931031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST