GB546764A - Improvements in photo-cathodes - Google Patents

Improvements in photo-cathodes

Info

Publication number
GB546764A
GB546764A GB4212/41A GB421241A GB546764A GB 546764 A GB546764 A GB 546764A GB 4212/41 A GB4212/41 A GB 4212/41A GB 421241 A GB421241 A GB 421241A GB 546764 A GB546764 A GB 546764A
Authority
GB
United Kingdom
Prior art keywords
alloy
per cent
cathode
antimony
layer
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
GB4212/41A
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.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph Co 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB546764A publication Critical patent/GB546764A/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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
    • H01J40/02—Details
    • H01J40/04—Electrodes
    • H01J40/06—Photo-emissive cathodes

Abstract

546,764. Silver-antimony alloy. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 28, 1941, No. 4212. Convention date, March 28, 1940. [Class 82 (i)] [Also in Group XL] A photo electric cathode which is irresponsive to red and infra-red rays is obtained by forming a film of a silver-antimony alloy on a glass support and then depositing a caesium layer on the alloy. The alloy contains from 17 per cent. to 13 per cent. antimony and the layers are thin enough to transmit 30 per cent. to 53 per cent. incident light or the alloy layer may be opaque and form a mosaic. The cµsium is applied without prior oxidation of the alloy but a small amount of oxygen may be applied to the layer for a very short time, to improve the action of the cathode in its colour response. As applied to an image intensifier the photo cathode is formed on a glass wall W of the tube by (1) vaporizing alloy pellets 7 by means of a filament 6 and (2) vaporizing cµsium pellets 9 from the side tube 8. Lens elements 2, 3, 4 and an anode 5 direct the electron image on the fluorescent screen S ; a gap 14 in the element 4 allows the caesium to flow freely from the side tube. Specification 488,920, [Group XL], is referred to.
GB4212/41A 1940-03-28 1941-03-28 Improvements in photo-cathodes Expired GB546764A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US879745XA 1940-03-28 1940-03-28
US546764XA 1940-03-28 1940-03-28

Publications (1)

Publication Number Publication Date
GB546764A true GB546764A (en) 1942-07-29

Family

ID=26733343

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4212/41A Expired GB546764A (en) 1940-03-28 1941-03-28 Improvements in photo-cathodes

Country Status (1)

Country Link
GB (1) GB546764A (en)

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