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GB504927A - Improvements in or relating to electron permeable electrodes - Google Patents

Improvements in or relating to electron permeable electrodes

Info

Publication number
GB504927A
GB504927A GB29426/37A GB2942637A GB504927A GB 504927 A GB504927 A GB 504927A GB 29426/37 A GB29426/37 A GB 29426/37A GB 2942637 A GB2942637 A GB 2942637A GB 504927 A GB504927 A GB 504927A
Authority
GB
United Kingdom
Prior art keywords
film
electrodes
mesh
mosaic
focusing
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
GB29426/37A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB29426/37A priority Critical patent/GB504927A/en
Priority to US237217A priority patent/US2254617A/en
Publication of GB504927A publication Critical patent/GB504927A/en
Expired 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
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/48—Tubes with amplification of output effected by electron multiplier arrangements within the vacuum space
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/023—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof secondary-electron emitting electrode arrangements
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y10T29/301—Method
    • Y10T29/302—Clad or other composite foil or thin metal making

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

504,927. Electron multipliers. McGEE, J. D. Oct. 28, 1937, Nos. 29426 and 33884. [Class 39 (i)] [Also in Group XXII] An electrode for use in electron multipliers comprises a thin film supported on a mesh structure ; the impingement of electrons on one side of the film causes emission of secondary electrons from the other side. The interstices of mesh may be 0À1 mm. in diameter with a shadow ratio of 10 per cent and are sufficiently small to support the film against air currents encountered in a room during assembly. The mesh, which may be made by electrodeposition and mounted and stretched as described in Specification 479,024, is immersed in a solution of cellulose acetate or collodion in acetone and withdrawn at an angle so as to leave solution in the meshes. When the solvent has evaporated, the metallic film is applied, as by sputtering, and the cellulose or collodion film is dissolved away, leaving the metal film on the mesh. To avoid local variations of surface tension likely to disrupt the film, the solution is performed slowly by starting with a nearly saturated solution and gradually diluting it. The film may comprise more than one metal layer; for example, caesium may be applied to oxidized silver. The thickness of the film is preferably such as just to prevent the incident electrons emerging from the other side. The electrodes may be used in an image intensifier with the final screen fluorescent or mosaic, focusing coils being provided between each electrode. In a modification to avoid focusing, the electrodes 4-7, Fig. 2, are placed so close together that lateral spreading cannot occur. The mesh supports are aligned so that they reduce the impenetrable area and assist focusing. If the meshes are coated with insulation such as lithium borate or alkali fluoride, the electrodes may be placed in contact. In the form shown the electron stream from photo-cathode 2 is amplified by the electrodes 4 ...7 and falls on a double-sided mosaic 9. Focusing coil 8a and grid 8 may be dispensed with and the mosaic (or a fluorescent screen) placed close to electrode 7. The large capacity between the mosaic and the other electrodes may reduce its sensitivity and this is avoided by high resistances placed in the leads to electrodes 4 ... 7. Specification 457,493 is referred to.
GB29426/37A 1937-10-28 1937-10-28 Improvements in or relating to electron permeable electrodes Expired GB504927A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB29426/37A GB504927A (en) 1937-10-28 1937-10-28 Improvements in or relating to electron permeable electrodes
US237217A US2254617A (en) 1937-10-28 1938-10-27 Electron discharge device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29426/37A GB504927A (en) 1937-10-28 1937-10-28 Improvements in or relating to electron permeable electrodes

Publications (1)

Publication Number Publication Date
GB504927A true GB504927A (en) 1939-04-28

Family

ID=10291381

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29426/37A Expired GB504927A (en) 1937-10-28 1937-10-28 Improvements in or relating to electron permeable electrodes

Country Status (2)

Country Link
US (1) US2254617A (en)
GB (1) GB504927A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1037610B (en) * 1954-06-04 1958-08-28 Westinghouse Electric Corp Electron multiplier with a large number of dynodes arranged between the cathode and the fluorescent screen, in which the carriers of the secondary electron emission layers are grid-like structures
GB2231198A (en) * 1989-03-31 1990-11-07 Litton Systems Inc Enhanced secondary electron emitter.

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537250A (en) * 1945-08-03 1951-01-09 Rca Corp Electronic tube
US2618761A (en) * 1949-02-23 1952-11-18 Rca Corp Negative stored charge pickup tube
US2782332A (en) * 1949-04-06 1957-02-19 Sheldon Edward Emanuel Method and device for reading images of invisible radiation
US2645734A (en) * 1949-09-29 1953-07-14 Rca Corp Storage tube with electron multiplying and selecting electrodes
US2839602A (en) * 1951-10-09 1958-06-17 Julius Cato Vredenburg Inglesb Method of and apparatus for recording pictures
US2992346A (en) * 1952-05-07 1961-07-11 Itt Light translating device
GB790416A (en) * 1953-06-05 1958-02-12 Emi Ltd Improvements in or relating to electron discharge devices incorporating electron multipliers
BE535919A (en) * 1954-02-26
US2992358A (en) * 1954-03-03 1961-07-11 Itt Radiation translating device
US2821643A (en) * 1954-06-21 1958-01-28 George A Morton Light sensitive storage tube and system
US3038095A (en) * 1956-04-26 1962-06-05 Westinghouse Electric Corp Electron discharge device
US2928969A (en) * 1956-05-11 1960-03-15 Westinghouse Electric Corp Image device
GB819217A (en) * 1956-11-30 1959-09-02 Nat Res Dev Improvements in or relating to photo-electron image multipliers
US3039017A (en) * 1960-04-12 1962-06-12 Clinton E Brown Image intensifier apparatus
US3202853A (en) * 1960-08-16 1965-08-24 Rca Corp Electron beam tube with less than three hundred mils spacing between the target electrode and photocathode electrode
US3137802A (en) * 1960-11-23 1964-06-16 Radames K H Gebel Screen raster photocathode having photoemissive and secondary emissive properties
NL277821A (en) * 1961-04-28
US3424937A (en) * 1965-01-08 1969-01-28 Goodyear Aerospace Corp Electron image correlator tube
FR2445018A1 (en) * 1978-12-22 1980-07-18 Anvar ELECTRON MULTIPLIER TUBE WITH AXIAL MAGNETIC FIELD

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1037610B (en) * 1954-06-04 1958-08-28 Westinghouse Electric Corp Electron multiplier with a large number of dynodes arranged between the cathode and the fluorescent screen, in which the carriers of the secondary electron emission layers are grid-like structures
GB2231198A (en) * 1989-03-31 1990-11-07 Litton Systems Inc Enhanced secondary electron emitter.
US4975656A (en) * 1989-03-31 1990-12-04 Litton Systems, Inc. Enhanced secondary electron emitter
GB2231198B (en) * 1989-03-31 1994-04-27 Litton Systems Inc Secondary electron emission cathode

Also Published As

Publication number Publication date
US2254617A (en) 1941-09-02

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