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GB662757A - Electron discharge device - Google Patents

Electron discharge device

Info

Publication number
GB662757A
GB662757A GB32476/48A GB3247648A GB662757A GB 662757 A GB662757 A GB 662757A GB 32476/48 A GB32476/48 A GB 32476/48A GB 3247648 A GB3247648 A GB 3247648A GB 662757 A GB662757 A GB 662757A
Authority
GB
United Kingdom
Prior art keywords
stage
collector
target
electrode
screen
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
GB32476/48A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB662757A publication Critical patent/GB662757A/en
Expired legal-status Critical Current

Links

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
    • H01J29/02—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
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
    • H01J31/36—Tubes with image amplification section, e.g. image-orthicon
    • 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
    • H01J43/08—Cathode arrangements

Landscapes

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

Abstract

662,757. Cathode-ray tubes. RADIO CORPORATION OF AMERICA. Dec. 15, 1948 [Dec. 19, 1947], No. 32476/48. Class 39 (i). The emissive surface of the first dynode of a low-velocity scanning type of image tube is convexly curved towards the impinging electrons, the radius of curvature being small enough to give uniform collection of secondary electrons by the collector and large enough so that substantially no tangents to the emissive surface will intersect any part of the collector electrode. The electron gun structure of the tube comprises a cathode 26, control grid 28, accelerating electrode 30 and limiting apertures electrodes 32, 34, and provides a low velocity beam which is focused by a wall coating and coil, and scanned on to a conducting glass target, the beam being reflected in accordance with the charge image on the target. A fine mesh collector screen is mounted close to and on the image side of the glass target. The convexly-curved electrode 32 is the first stage of a multiplier section and is formed of a silver magnesium sheet to provide a dynode surface. The multiplier has further stages 44, 46, 48, 52 each maintained at progressively higher potentials, with a final collecting stage 50 at the highest potential. Each stage 44, 46, 48 consists of a thirty-two blade pin-wheel of silver magnesium alloy, the blades of consecutive pin-wheels being formed in an opposite sense and each stage has a 90 per cent transmission screen 51, 53, 55 preventing the suppression of the secondaries to be collected. The collector 50 comprises an annular ring with a metal screen stretched across it. A persuader electrode 42 encloses the first stage 32 and is slightly more negative than the enclosed stage, giving a practically field-free space above the surface of the anode. A finemesh screen is mounted close to the glass target on the photo-cathode side and is several volts positive relative to the equilibrium potential of the target collecting the secondaries emitted therefrom. The dynode surface 32 is located in the weak fringe field of the solenoid 16 (not shown).
GB32476/48A 1947-12-19 1948-12-15 Electron discharge device Expired GB662757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US792797A US2498082A (en) 1947-12-19 1947-12-19 Gun structure for cathode-ray tubes

Publications (1)

Publication Number Publication Date
GB662757A true GB662757A (en) 1951-12-12

Family

ID=25158098

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32476/48A Expired GB662757A (en) 1947-12-19 1948-12-15 Electron discharge device

Country Status (6)

Country Link
US (1) US2498082A (en)
BE (1) BE486327A (en)
DE (1) DE838472C (en)
FR (1) FR975875A (en)
GB (1) GB662757A (en)
NL (2) NL83421C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146169A (en) * 1983-05-25 1985-04-11 Philips Nv Photomultiplier tube

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777970A (en) * 1950-10-03 1957-01-15 Paul K Weimer Television camera storage tube
US2942132A (en) * 1957-10-02 1960-06-21 Rca Corp Electron multiplier
US3716738A (en) * 1971-04-26 1973-02-13 Itt Television camera tube having channel multiplier surrounding electron gun
US8255835B2 (en) 2004-02-24 2012-08-28 Research In Motion Limited Method and system for managing unread electronic messages

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1559460A (en) * 1920-06-30 1925-10-27 Ruben Samuel Electron tube
US2204503A (en) * 1937-02-20 1940-06-11 Firm Of Fernseh Ag Electron multiplier
US2424850A (en) * 1944-04-07 1947-07-29 Farnsworth Television & Radio Photoelectron multiplier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146169A (en) * 1983-05-25 1985-04-11 Philips Nv Photomultiplier tube

Also Published As

Publication number Publication date
BE486327A (en) 1948-12-31
NL143880B (en)
FR975875A (en) 1951-03-12
NL83421C (en) 1956-07-16
DE838472C (en) 1952-05-08
US2498082A (en) 1950-02-21

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