GB1395441A - Image intensifiers - Google Patents

Image intensifiers

Info

Publication number
GB1395441A
GB1395441A GB267873A GB267873A GB1395441A GB 1395441 A GB1395441 A GB 1395441A GB 267873 A GB267873 A GB 267873A GB 267873 A GB267873 A GB 267873A GB 1395441 A GB1395441 A GB 1395441A
Authority
GB
United Kingdom
Prior art keywords
layer
reflective
membranes
input electrode
thick
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
GB267873A
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB267873A priority Critical patent/GB1395441A/en
Priority to US433534A priority patent/US3898498A/en
Priority to DE2401662A priority patent/DE2401662A1/en
Priority to JP49007806A priority patent/JPS49106279A/ja
Priority to FR7401583A priority patent/FR2214964B2/fr
Publication of GB1395441A publication Critical patent/GB1395441A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/04—Electron multipliers
    • H01J43/06—Electrode arrangements
    • H01J43/18—Electrode arrangements using essentially more than one dynode
    • H01J43/24—Dynodes having potential gradient along their surfaces
    • 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
    • H01J31/506—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output tubes using secondary emission effect
    • H01J31/507—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output tubes using secondary emission effect using a large number of channels, e.g. microchannel plates
    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
    • H01J9/125—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes of secondary emission electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/32—Secondary emission electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Electron Tubes For Measurement (AREA)

Abstract

1395441 Image intensifier tubes; electron multipliers MULLARD Ltd 18 Jan 1973 2678/73 Addition to 1175599 Heading HID An image intensifier tube comprises in combination a channel plate as claimed in any one of claims 1 to 4 of the parent Specification, a photo-cathode spaced from the input face of the plate, and a display screen, wherein the channel plate input face comprising the conductive membranes is substantially non-reflective of radiation of wavelengths to which the photocathode is sensitive. The membrane may be continuous, superposed on the input electrode as in Fig. 2, or insulated from the input electrode to be at a different potential as in Fig. 3 (not shown). Alternatively membranes may be extensions of the input electrode to form together a continuous layer, Fig. 4 (not shown). Opaqueness of membranes to visible and U.V. radi tion inhibits feedback from a display screen which then requires no metal backing. Membranes D may be separate elements with their edges in electrical contact with input electrode in which ease the latter are also non- reflective. A continuous layer may include a self-supporting layer or film of A1 which is crystalline (non-reflective) and a second layer of amorphous A1 (non-reflective or "black"). In fabrication, a lacquer film is produced by flotation on water, placed over an input face in Figs. 2, 3 or on a glass substrate for the Fig. 4 device, followed by evaporation of the A1. For a glass matrix reduction of a metal (e.g. Pb) compound in the matrix for the requisite conductivity, may be repeated after final baking of the second layer in air or oxygen or can be postponed until after baking. The first A1 layer should be 200 Š thick. The second A1 layer is also evaporated but in an inert gas (e.g. nitrogen at 0À05 torr), the lacquer then being burned off. The amorphous layer thickness may be assessed by reflection of a glowing filament and is preferably 300 to 800 Š thick. Channel plate specifications are given with an A1 film Df 500 to 1000 Š thick. Image intensifier tubes of "proximity" and "inverter" type are exemplified.
GB267873A 1973-01-18 1973-01-18 Image intensifiers Expired GB1395441A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB267873A GB1395441A (en) 1973-01-18 1973-01-18 Image intensifiers
US433534A US3898498A (en) 1973-01-18 1974-01-14 Channel multiplier having non-reflective amorphous aluminum layer obturating channel entrances on side facing photocathode
DE2401662A DE2401662A1 (en) 1973-01-18 1974-01-15 ELECTRON MULTIPLE
JP49007806A JPS49106279A (en) 1973-01-18 1974-01-16
FR7401583A FR2214964B2 (en) 1973-01-18 1974-01-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB267873A GB1395441A (en) 1973-01-18 1973-01-18 Image intensifiers

Publications (1)

Publication Number Publication Date
GB1395441A true GB1395441A (en) 1975-05-29

Family

ID=9743853

Family Applications (1)

Application Number Title Priority Date Filing Date
GB267873A Expired GB1395441A (en) 1973-01-18 1973-01-18 Image intensifiers

Country Status (5)

Country Link
US (1) US3898498A (en)
JP (1) JPS49106279A (en)
DE (1) DE2401662A1 (en)
FR (1) FR2214964B2 (en)
GB (1) GB1395441A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475059A (en) * 1982-06-01 1984-10-02 International Telephone And Telegraph Corporation Image intensifier tube with reduced veiling glare and method of making same
US4691099A (en) * 1985-08-29 1987-09-01 Itt Electro Optical Products Secondary cathode microchannel plate tube
US5268612A (en) * 1991-07-01 1993-12-07 Intevac, Inc. Feedback limited microchannel plate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243626A (en) * 1962-07-17 1966-03-29 Rca Corp Photosensitive cathode with closely adjacent light-diffusing layer
GB1175599A (en) * 1967-11-28 1969-12-23 Mullard Ltd Improvements in or relating to Image Intensifiers and the like
US3588570A (en) * 1968-04-29 1971-06-28 Westinghouse Electric Corp Masked photocathode structure with a masked,patterned layer of titanium oxide

Also Published As

Publication number Publication date
DE2401662A1 (en) 1974-08-08
US3898498A (en) 1975-08-05
JPS49106279A (en) 1974-10-08
FR2214964B2 (en) 1976-11-26
FR2214964A2 (en) 1974-08-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years