US3846654A - Vacuum image converter - Google Patents

Vacuum image converter Download PDF

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Publication number
US3846654A
US3846654A US00339228A US33922873A US3846654A US 3846654 A US3846654 A US 3846654A US 00339228 A US00339228 A US 00339228A US 33922873 A US33922873 A US 33922873A US 3846654 A US3846654 A US 3846654A
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US
United States
Prior art keywords
anode
flask
vacuum
image converter
carrier
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
US00339228A
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English (en)
Inventor
K Franz
H Christigau
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
Siemens Corp
Original Assignee
Siemens 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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3846654A publication Critical patent/US3846654A/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
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • H01J31/501—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output with an electrostatic electron optic system

Definitions

  • a vacuum image converter has a vacuum flask containing an electrode device for reproducing an electron ray bundle released at the cathode upon an anode separated from the cathode.
  • the converter is particularly characterized in that the electrode system is built into the flask as an element produced and adjusted outside of the flask.
  • This invention relates to a vacuum image converter having a vacuum flask containing an electrode device for reproducing an electron ray bundle released at the cathode upon an anode located at a distance from the cathode.
  • X-ray tubes of this type contain an electrooptically operating photocathode which releases electrons when struck by rays, such as X-rays, which are to be transformed in their frequency and intensity and the electrons of which are distributed corresponding to the distribution of the density of the rays in the ray bundle, for example, corresponding to an image. Then follows the electrode arrangement of the electron optics, which is so constructed that the electron image is represented upon the anode. To make the image visible the anode can be coated with a luminous substance which is lit by the electrons.
  • the anode can be also the target of a television device. In that case the image converter is a part of a television receiving tube.
  • the vacuum flask contains the electrodes to a large extent as independent units which must be individually introduced and adjusted within the flask.
  • the electrodes there are also other constructions wherein a part of the electrodes is applied as coatings upon the walls of the flask. In such construction an adjustment step is also necessary, to correctly set the coated walls relatively to each other. At the same time it is necessary to carry out the already difficult vacuum tight relative adjustment of the parts of the flask.
  • An object of the present invention is to simplify the manufacture of vacuum image converters.
  • the construction is a simple one it is most advantageous to provide for a plurality of electrodes a common basic element which can consist of an electrically insulating material. Then the electrodes can be applied as coatings. Only those parts which provide difficulties during the manufacture of the carrier in one piece, must be produced as separate parts and inserted into the carrier or placed thereon.
  • a photocathode device which closes the cylindrical structural element on one side as a cover. The side opposite the cathode is constituted by the anode arrangement upon which the electrons are represented as small units. The anode is the bottom of the structure. An electrode located directly in front of this electrode and substantially parallel thereto is inserted in the simplest way as a separate part upon this bottom and is fixed by gluing or the like.
  • Plastics have also the advantage that they can be welded among themselves or glued with metals and other materials.
  • plastics can be used polyimides or polysulfons, particularly polyarilsufons, since they are sufficiently vacuum tight during heating as well as in operation. The same plastic materials can be also used as glues.
  • metal layers are used as electrically conducting layers, such as those of aluminum, chromium or chromium-nickel, which are applied by steaming.
  • other application methods can be also used, as, for example, cathode spraying, electrolysis, poyrolysis etc.
  • Conducting lacquers and coatings are also useable as long as they conform to requirements of the high vacuum of the image converter tube.
  • FIGURE shows by way of example only, a section through an X-ray image converter along its longitudinal axis.
  • the drawing shows a vacuum tube 1 consisting of two pot-like parts 2 and 3 of glass.
  • the parts 2 and 3 have adjacent edges carrying flanges 4 and 5 of vacan or some other suitable melting alloy.
  • the flanges lie one on top of the other and they are vacuumtightly welded at their outer edge 6.
  • the flask 1 contains a cup-shaped part 7 serving as a carrier and consisting of polyimide.
  • the shape of the part 7 is substantially that of the flask l; at its bottom is an oppositely extending part 8 constituting the actual anode.
  • a part 9 placed in the groove 10 at the bottom of the part 7, constitutes the electrode mounted in front of the anode.
  • the part 9 is glued in the groove 10 with polyimide lacquer, and so is the side extension 11 to the extension 12 of the flange 5 and, as well as the projection 13 of the cap 14 to the upper end of the part 7.
  • the parts 7, 9 and 14 have a wall thickness of 1 mm, so that in case of a diameter of 300 mm they are sufficiently stable.
  • This construction constitutes the electrode arrangement which is produced in that a cap 14 having the shape of a section of a sphere receives a luminous layer 15 consisting of activated cesium iodide steamed on in high vacuum.
  • the further layer 16 is steamed on in the usual manner after the completion of the flask; it consists of antimony which has been activated by cesium metals.
  • the electrical connection takes place by a steamed on side metal layer 17 consisting of aluminum and having a thickness of 500 mg.
  • the electrodes 18 and 19 as well as the coatings 20 and 21 of further electrodes and of the anode 8 also consist of steamed on aluminum layers with a thickness of 500 mu.
  • the known luminous screen 22 mounted upon a support 23 consisting of a glass plate 1 mm thick.
  • the support also carrier a luminous layer 24 consisting of zinc-cadmium-sulfide activated with silver and having a thickness of 7a.
  • Extending toward the interior of the flask is an electrically conducting covering 25 which consists of aluminum and is 200 mp. thick.
  • the electrical supply of the image converter takes place in the known manner through contacts 26 to 30, whereby between contacts 26 and 27 100 v. are provided, between contacts 27 and 28 300 v., between contacts 28 and 29 35 kv and between contact 29 and the connection 30 of the anode 8 a voltage of 25 kV is supplied.
  • a vacuum image converter comprising a vacuum flask, a cathode within said flask for releasing an electron ray bundle, an anode within said flask and spaced from said cathode for receiving said electron ray bundle and an electrode system actuating said bundle of electrons and said vacuum image converter further comprising a carrier disposed within said vacuum flask consisting of an electrically insulating substance, said electrode system comprising a plurality of electrodes located between said cathode and said anode and mounted as electrically conducting coatings upon said carrier, said carrier having the shape of a pot with a bottom enclosing the anode and a top constituting a cover carrying said anode.
  • An image converter according to claim 1 comprising a luminous screen and a photo-cathode layer, and a carrier consisting of a plastic material and located opposite the anode.

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US00339228A 1972-03-15 1973-03-08 Vacuum image converter Expired - Lifetime US3846654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722212579 DE2212579A1 (de) 1972-03-15 1972-03-15 Vakuum-bildwandler

Publications (1)

Publication Number Publication Date
US3846654A true US3846654A (en) 1974-11-05

Family

ID=5839014

Family Applications (1)

Application Number Title Priority Date Filing Date
US00339228A Expired - Lifetime US3846654A (en) 1972-03-15 1973-03-08 Vacuum image converter

Country Status (4)

Country Link
US (1) US3846654A (enExample)
JP (1) JPS4912761A (enExample)
DE (1) DE2212579A1 (enExample)
FR (1) FR2175953B1 (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045700A (en) * 1974-12-23 1977-08-30 Siemens Aktiengesellschaft X-ray image intensifier
US4943254A (en) * 1988-07-08 1990-07-24 Thomson-Csf Method for the fabrication of an improved X-ray image intensifier tube, and intensifier tube, and intensifier tube obtained thereby

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53121455A (en) * 1977-03-31 1978-10-23 Toshiba Corp Electrode constituent of x-ray image tube
JPS61147620A (ja) * 1984-12-21 1986-07-05 Hitachi Ltd Ｐｃｍ搬送装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752519A (en) * 1952-08-27 1956-06-26 John E Ruedy Method and apparatus for use in chemical evaporation processes
US2803770A (en) * 1950-09-18 1957-08-20 Fernseh Gmbh Electron discharge tube apparatus
US3300668A (en) * 1962-01-24 1967-01-24 Rauland Corp Image converter tube
US3617791A (en) * 1968-03-14 1971-11-02 Siemens Ag Image intensifier including polyimide support

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803770A (en) * 1950-09-18 1957-08-20 Fernseh Gmbh Electron discharge tube apparatus
US2752519A (en) * 1952-08-27 1956-06-26 John E Ruedy Method and apparatus for use in chemical evaporation processes
US3300668A (en) * 1962-01-24 1967-01-24 Rauland Corp Image converter tube
US3617791A (en) * 1968-03-14 1971-11-02 Siemens Ag Image intensifier including polyimide support

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045700A (en) * 1974-12-23 1977-08-30 Siemens Aktiengesellschaft X-ray image intensifier
US4943254A (en) * 1988-07-08 1990-07-24 Thomson-Csf Method for the fabrication of an improved X-ray image intensifier tube, and intensifier tube, and intensifier tube obtained thereby

Also Published As

Publication number Publication date
FR2175953A1 (enExample) 1973-10-26
DE2212579A1 (de) 1973-09-27
JPS4912761A (enExample) 1974-02-04
FR2175953B1 (enExample) 1978-04-21

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