FR2349949A1 - Focussing system for image intensifier tube - has dished cathode, perforated intermediate anode and second spaced planar anode - Google Patents

Focussing system for image intensifier tube - has dished cathode, perforated intermediate anode and second spaced planar anode

Info

Publication number
FR2349949A1
FR2349949A1 FR7714145A FR7714145A FR2349949A1 FR 2349949 A1 FR2349949 A1 FR 2349949A1 FR 7714145 A FR7714145 A FR 7714145A FR 7714145 A FR7714145 A FR 7714145A FR 2349949 A1 FR2349949 A1 FR 2349949A1
Authority
FR
France
Prior art keywords
anode
cathode
focussing system
dished
image intensifier
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
FR7714145A
Other languages
French (fr)
Other versions
FR2349949B3 (en
Inventor
Robert Evrard
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.)
South African Inventions Development Corp
Original Assignee
South African Inventions Development 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 South African Inventions Development Corp filed Critical South African Inventions Development Corp
Publication of FR2349949A1 publication Critical patent/FR2349949A1/en
Application granted granted Critical
Publication of FR2349949B3 publication Critical patent/FR2349949B3/fr
Granted legal-status Critical Current

Links

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

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

The focussing system contains a concave cathode (14) and an intermediate anode (16), spaced from the cathode, and having plane surfaces and a perforation (20). The focussing system anode (18) is mounted at the intermediate anode side away from the cathode, the second anode being also flat. Pref. the cathode is partly spherical so that its concave surface faces the intermediate anode. The three electrodes are so designed that, on application of suitable potential differences, curved equipotential surfaces are produced between the cathode and the intermediate anode, but flat equipotential surfaces between the intermediate anode and the anode proper. The perforation of the intermediate anode may be circular and concentric to the cathode.
FR7714145A 1976-04-30 1977-04-29 Focussing system for image intensifier tube - has dished cathode, perforated intermediate anode and second spaced planar anode Granted FR2349949A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA762611A ZA762611B (en) 1976-04-30 1976-04-30 An electron beam device

Publications (2)

Publication Number Publication Date
FR2349949A1 true FR2349949A1 (en) 1977-11-25
FR2349949B3 FR2349949B3 (en) 1980-03-07

Family

ID=25570265

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7714145A Granted FR2349949A1 (en) 1976-04-30 1977-04-29 Focussing system for image intensifier tube - has dished cathode, perforated intermediate anode and second spaced planar anode

Country Status (3)

Country Link
DE (1) DE2718423A1 (en)
FR (1) FR2349949A1 (en)
ZA (1) ZA762611B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686731A1 (en) * 1992-01-27 1993-07-30 Csir IONIZING RADIATION CONVERTER AND DIAGNOSTIC APPARATUS USING SUCH CONVERTER.
FR2688939A1 (en) * 1992-03-17 1993-09-24 Siemens Ag Radiological image intensifier
FR2688938A1 (en) * 1992-03-17 1993-09-24 Siemens Ag Radiological image intensifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686731A1 (en) * 1992-01-27 1993-07-30 Csir IONIZING RADIATION CONVERTER AND DIAGNOSTIC APPARATUS USING SUCH CONVERTER.
EP0554076A1 (en) * 1992-01-27 1993-08-04 Csir Ionising radiation converter
US5357100A (en) * 1992-01-27 1994-10-18 Csir Ionizing radiation converter with catadioptric electron focusing
FR2688939A1 (en) * 1992-03-17 1993-09-24 Siemens Ag Radiological image intensifier
FR2688938A1 (en) * 1992-03-17 1993-09-24 Siemens Ag Radiological image intensifier

Also Published As

Publication number Publication date
FR2349949B3 (en) 1980-03-07
ZA762611B (en) 1977-12-28
DE2718423A1 (en) 1977-11-10

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Legal Events

Date Code Title Description
ST Notification of lapse