US2873379A - Protecting envelope for x-ray tubes - Google Patents

Protecting envelope for x-ray tubes Download PDF

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Publication number
US2873379A
US2873379A US666536A US66653657A US2873379A US 2873379 A US2873379 A US 2873379A US 666536 A US666536 A US 666536A US 66653657 A US66653657 A US 66653657A US 2873379 A US2873379 A US 2873379A
Authority
US
United States
Prior art keywords
envelope
wall
window
ray tubes
insulating material
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
US666536A
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English (en)
Inventor
Berends Werner
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 US2873379A publication Critical patent/US2873379A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to metal protecting-envelopes for use in X-ray tubes, the wall of which comprises a window of insulating material, for example casting resin or moulded insulating material, for the passage of the X-rays. It is customary to fill the envelope with oil and, in order for the layer of oil between the tube wall and the window to be thin the window is connected to the wall of the envelope by means of a re-entrant edge.
  • closure means are provided in front of the aperture for the passage of the rays, for example an ionisation chamber connected to the wall or the aperture is partly closed by a diaphragm limiting the beam, the air inside the closed space simulates an air-bubble in the oil filling.
  • the air is strongly ionized by the X-rays and consequently has good electrical conductivity in comparison with the insulating material of the window and the oil-filling of the envelope.
  • the influence thereof corresponds to that of a grounded electrode closely spaced from the glass wall of the X-ray tube.
  • the present invention provides a simple expedient for avoiding this detrimental phenomenon.
  • the space enclosed by the window having a re-entrant edge and connected to the wall of the envelope is least partially filled with high-grade insulating material containing a large number of individual airbubbles.
  • the space may be filled up with granular material and may be shielded by means of a wall transparent to X-rays.
  • the space may be filled with a material of foamy structure, a very suitable material being polystyrene.
  • a material of foamy structure a very suitable material being polystyrene.
  • the marked result obtained by the invention may be explained by the fact that, although ionisation occurs in the space separated by the window from the interior of the envelope, this ionisation is limited to the air inside the bubbles, and the air-inclusions thus rendered conductve are insulated from one. another.
  • the material used as a filler takes a part of the potential difference set up between the tube wall and the envelope of the tube, thus reducing the electrical load of the window, the layer of oil and the wall of the tube.
  • FIG. 1 shows that portion of the envelope of the tube accord ing to the invention, which comprises a window 3 for the passage of the X-rays.
  • the wall 1 of the envelope surrounds an X-ray tube 2 comprising a cathode 3 and an anode i.
  • the envelope may be filled with oil.
  • the window 5 for the passage of the X-rays is connected through the edge 6 to the wall 1 of the envelope.
  • a space 7 bounded by the window and the edge is filled with a material 8 of foamy structure.
  • a protecting envelope for use in X-ray tubes the
  • I wall of which comprises a window of insulating material for the passage of the rays, said window being connected with a re-entrant edge to the wall of the envelope defining therewith an enclosed space which is at least partially filled with high-grade insulating material contraining a great number of individual air-bubbles.

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  • X-Ray Techniques (AREA)
US666536A 1956-07-19 1957-06-19 Protecting envelope for x-ray tubes Expired - Lifetime US2873379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM31166A DE1017297B (de) 1956-07-19 1956-07-19 Schutzgehaeuse fuer Roentgenroehren

Publications (1)

Publication Number Publication Date
US2873379A true US2873379A (en) 1959-02-10

Family

ID=7301156

Family Applications (1)

Application Number Title Priority Date Filing Date
US666536A Expired - Lifetime US2873379A (en) 1956-07-19 1957-06-19 Protecting envelope for x-ray tubes

Country Status (6)

Country Link
US (1) US2873379A (enrdf_load_stackoverflow)
BE (1) BE559346A (enrdf_load_stackoverflow)
DE (1) DE1017297B (enrdf_load_stackoverflow)
FR (1) FR1179048A (enrdf_load_stackoverflow)
GB (1) GB832399A (enrdf_load_stackoverflow)
NL (1) NL103562C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519752A (en) * 1994-10-13 1996-05-21 Sandia Corporation X-ray transmissive debris shield

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2387427A (en) * 1942-10-22 1945-10-23 Gen Electric X Ray Corp X-ray apparatus
US2699506A (en) * 1950-11-02 1955-01-11 Hartford Nat Bank & Trust Co Device for measuring the x-ray energy of an x-ray tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2387427A (en) * 1942-10-22 1945-10-23 Gen Electric X Ray Corp X-ray apparatus
US2699506A (en) * 1950-11-02 1955-01-11 Hartford Nat Bank & Trust Co Device for measuring the x-ray energy of an x-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519752A (en) * 1994-10-13 1996-05-21 Sandia Corporation X-ray transmissive debris shield

Also Published As

Publication number Publication date
DE1017297B (de) 1957-10-10
GB832399A (en) 1960-04-13
BE559346A (enrdf_load_stackoverflow) 1958-01-18
NL103562C (nl) 1963-01-15
FR1179048A (fr) 1959-05-20

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