EP0241726A1 - Tube intensificateur d'images - Google Patents

Tube intensificateur d'images Download PDF

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Publication number
EP0241726A1
EP0241726A1 EP87103724A EP87103724A EP0241726A1 EP 0241726 A1 EP0241726 A1 EP 0241726A1 EP 87103724 A EP87103724 A EP 87103724A EP 87103724 A EP87103724 A EP 87103724A EP 0241726 A1 EP0241726 A1 EP 0241726A1
Authority
EP
European Patent Office
Prior art keywords
parts
vacuum
image intensifier
flanges
intensifier 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.)
Granted
Application number
EP87103724A
Other languages
German (de)
English (en)
Other versions
EP0241726B1 (fr
Inventor
Hans Stübler
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6298553&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0241726(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0241726A1 publication Critical patent/EP0241726A1/fr
Application granted granted Critical
Publication of EP0241726B1 publication Critical patent/EP0241726B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/28—Vacuum-tight joints between parts of vessel between conductive parts of vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes

Definitions

  • the present invention relates to an image intensifier tube according to the preamble of patent claim 1.
  • Such image intensifier tubes are produced in such a way that the tube is first constructed mechanically and then at least some materials for producing the photocathode layer, in particular in the form of metal vapors, are introduced through the pump connection. This is followed by formation steps and, if necessary, further evaporation, until the tube is finally pumped out and the pump nozzles are closed. During the final inspection or even before the tube is finally pumped out, faults in the photocathode layer can become noticeable, which lead to the tube being unusable and which cannot be repaired when the tube is assembled. The tube must therefore be opened again in order to insert a new photocathode support.
  • the present invention has for its object to provide a novel structure of an image intensifier tube mentioned above, which is easy to open in the case of an unusable photocathode and enables the installation of a new photocathode support, the risk of undesirable electron emissions occurring being largely avoided. This is particularly important if it is an image intensifier tube that has a multichannel electron intensifier plate in close proximity to the fluorescent screen (2nd generation image intensifier, inverter type).
  • the main advantage of the image intensifier tube according to the invention is that the opening of the tube takes place at a location which also allows removal or replacement of the wall parts which tend to undesired electron emissions.
  • These include insulating rings of the vacuum housing, which are partially covered with the materials used to vaporize the photocathode. Such deposits on insulating parts are partially converted when the tube is opened and exposed to the normal atmosphere for a long time and lead to such disruptive materials which emit unwanted electrons.
  • These are, in particular, those wall parts between the electrode with low electron passage opening and the photocathode.
  • the electrode with the small passage opening largely shields the space on the fluorescent screen side from the vapor deposition materials for the photocathode.
  • the image intensifier tube has an essentially rotationally symmetrical structure, i. H. the insulating parts and the electrodes or their holders are essentially rotationally symmetrical parts.
  • the cathode electrode 1 which is at the cathode potential, consists of several parts and has one or two pump connections 14 and 15. The material vapors for producing the photocathode are also at least partially introduced through the pump nozzle.
  • the cathode electrode carries an input window 3, which, for. B. consists of an optical fiber disc.
  • the photocathode layer 5 is applied to the inner surface of this input window 3.
  • an anode electrode 6 which has an electron passage opening 16 of small diameter, e.g. B. 1 to 2 mm in diameter.
  • the beam waist (crossover) of the electron beam emerging from the photocathode 5 is located in this area.
  • This anode electrode 6 is held between two ceramic insulating rings 2 and 9 by means of a metallic ring part.
  • the tube also has a transparent fluorescent screen support 4, on the inner surface of which the fluorescent screen layer 7 is arranged.
  • a multichannel electron amplifier plate 8 is attached which, like the fluorescent screen support 4, is connected in a vacuum-tight manner to insulating rings 2 with the interposition of mounts designed as metal rings.
  • the insulating rings 2 and 9, which are preferably made of ceramic, ensure the desired distance on the one hand and the desired insulation of the electrodes on the other hand.
  • annular metal part is now inserted into the vacuum vessel, which consists of two parts 11a and 11b, each of which has an outwardly facing annular flange 12.
  • the vacuum-tight connection of the two parts 11a and 11b takes place on the circumference 13 of the two ring flanges 12 lying one on top of the other in such a way that this connection can be removed again by twisting or grinding, so that the tube can be easily opened at this point.
  • the two ring parts 11a and 11b which are each connected with their other ends in a vacuum-tight manner to insulating rings 2, are located in the region between the anode electrode 6 and the multi-channel plate 8.
  • the tube is opened by removing the vacuum-tight connection 13 and the part 11a with the parts attached to the cathode is exchanged for a new part.
  • the part with the expensive multi-channel amplifier plate 8 and the fluorescent screen 7 can be used again and on the other hand that the parts of the vacuum envelope, including the insulating rings 9 of the vacuum envelope, are located in the space between the photocathode 5 and the anode electrode 6, be replaced with. Because of the production of the photocathode 5, vapors of the metals which are used for the production of the photocathode have also deposited on the wall parts of the insulating ring 9 in this space.
  • the anode electrode 6 with its small electron opening 16 largely acts as a shield against these metal vapors during photocathode manufacture, so that the wall parts in the space between the anode electrode 6 and the fluorescent screen 7 are essentially not exposed to such vapors and therefore also after opening are reusable.
  • the pump sockets 15 and 14 which may already have been mechanically deformed by being squeezed, are located on the part that is replaced when the tube has to be opened, so that the new spare part also has new pump sockets.
  • the vacuum-tight connection on the circumference 13 of the flanges 12 of the two metal rings 11a and 11b preferably consists of a welded connection.
  • the connections between the ceramic parts 2, 9 and the metal electrode holders are preferably soldered connections.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP87103724A 1986-04-12 1987-03-14 Tube intensificateur d'images Expired EP0241726B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3612368 1986-04-12
DE19863612368 DE3612368A1 (de) 1986-04-12 1986-04-12 Bildverstaerkerroehre

Publications (2)

Publication Number Publication Date
EP0241726A1 true EP0241726A1 (fr) 1987-10-21
EP0241726B1 EP0241726B1 (fr) 1989-11-23

Family

ID=6298553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103724A Expired EP0241726B1 (fr) 1986-04-12 1987-03-14 Tube intensificateur d'images

Country Status (2)

Country Link
EP (1) EP0241726B1 (fr)
DE (2) DE3612368A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638281A1 (fr) * 1988-10-25 1990-04-27 Thomson Csf Tube electronique de construction compacte

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1764315A1 (de) * 1968-05-15 1971-07-01 Siemens Ag Elektronenroehre
US3868536A (en) * 1971-10-18 1975-02-25 Varian Associates Image intensifier tube employing a microchannel electron multiplier
US4039877A (en) * 1975-07-09 1977-08-02 International Telephone And Telegraph Corporation Image intensifier with fiber optic faceplates sealed with indium-bismuth alloy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1764315A1 (de) * 1968-05-15 1971-07-01 Siemens Ag Elektronenroehre
US3868536A (en) * 1971-10-18 1975-02-25 Varian Associates Image intensifier tube employing a microchannel electron multiplier
US4039877A (en) * 1975-07-09 1977-08-02 International Telephone And Telegraph Corporation Image intensifier with fiber optic faceplates sealed with indium-bismuth alloy

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638281A1 (fr) * 1988-10-25 1990-04-27 Thomson Csf Tube electronique de construction compacte
EP0367652A1 (fr) * 1988-10-25 1990-05-09 Thomson-Csf Tube électronique de construction compacte et procédé de fabrication
US5017827A (en) * 1988-10-25 1991-05-21 Thomson-Csf Compactly built electron tube and fabrication method thereof

Also Published As

Publication number Publication date
DE3761032D1 (en) 1989-12-28
DE3612368A1 (de) 1987-10-15
EP0241726B1 (fr) 1989-11-23

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