GB1137685A - Photosensitive pickup tube including an electron multiplier - Google Patents

Photosensitive pickup tube including an electron multiplier

Info

Publication number
GB1137685A
GB1137685A GB15208/66A GB1520866A GB1137685A GB 1137685 A GB1137685 A GB 1137685A GB 15208/66 A GB15208/66 A GB 15208/66A GB 1520866 A GB1520866 A GB 1520866A GB 1137685 A GB1137685 A GB 1137685A
Authority
GB
United Kingdom
Prior art keywords
coating
cathode
organic material
nickel
dynode
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
GB15208/66A
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 GB1137685A publication Critical patent/GB1137685A/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
    • H01J43/10—Dynodes
    • 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

Landscapes

  • Electron Tubes For Measurement (AREA)
  • Solid Thermionic Cathode (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1,137,685. Cathode-ray tubes. RADIO CORPORATION OF AMERICA. 5 April, 1966 [27 April, 1965], No. 15208/66. Heading H1D. The first dynode of the electron multiplier in an image orthicon has the beam limiting aperture 32 facing the cathode 40 flared as shown, and coated with secondary electron inhibiting material, e.g. colloidal graphite or a carbon compound such as petroleum lubricating oil or grease, or a metal such as chromium, palladium or gold. Carbonates or oxides, e.g. of barium, strontium and calcium, emitted from the cathode 40 may react with a coating of organic material to produce a compound having a relatively low secondary emission ratio. The organic material may be applied by brushing or by causing the material to flow through the aperture 32 in liquid form under a differential pressure. Preferably the coating is porous; the coating of organic material may be rendered porous by sand-blasting. The coating thickness is at least about 200 Angstroms. The secondary emissive coating 38 of the dynode is a thin coating, e.g. about 100 Angstroms thick, of magnesium oxide. The surface of the nickel substrate 36 is highly smooth and this is accomplished by using a plating bath consisting of nickel sulphamate, boric acid and nickel chloride in de-ionized water.
GB15208/66A 1965-04-27 1966-04-05 Photosensitive pickup tube including an electron multiplier Expired GB1137685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US451228A US3346752A (en) 1965-04-27 1965-04-27 Electron multiplier dynode having an aperture of reduced secondary emission

Publications (1)

Publication Number Publication Date
GB1137685A true GB1137685A (en) 1968-12-27

Family

ID=23791345

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15208/66A Expired GB1137685A (en) 1965-04-27 1966-04-05 Photosensitive pickup tube including an electron multiplier

Country Status (3)

Country Link
US (1) US3346752A (en)
DE (1) DE1564526B2 (en)
GB (1) GB1137685A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718836A (en) * 1970-11-18 1973-02-27 Itt Multipactor ion generator
US4347458A (en) * 1980-03-26 1982-08-31 Rca Corporation Photomultiplier tube having a gain modifying Nichrome dynode
GB2080016A (en) * 1980-07-09 1982-01-27 Philips Electronic Associated Channel plate electron multiplier

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201630A (en) * 1955-03-30 1965-08-17 Itt Charge storage sheet with tapered apertures
US2955229A (en) * 1956-11-14 1960-10-04 Gen Electric Secondary emission suppression in electron beam tubes
US2942132A (en) * 1957-10-02 1960-06-21 Rca Corp Electron multiplier
US3252034A (en) * 1962-04-16 1966-05-17 Eitel Mccullough Inc R-f window for high power electron tubes

Also Published As

Publication number Publication date
DE1564526B2 (en) 1971-02-04
US3346752A (en) 1967-10-10
DE1564526A1 (en) 1970-09-17

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