GB860476A - Improvements relating to cathode-ray tube systems and to cathode-ray tubes for use th - Google Patents

Improvements relating to cathode-ray tube systems and to cathode-ray tubes for use th

Info

Publication number
GB860476A
GB860476A GB3940958A GB3940958A GB860476A GB 860476 A GB860476 A GB 860476A GB 3940958 A GB3940958 A GB 3940958A GB 3940958 A GB3940958 A GB 3940958A GB 860476 A GB860476 A GB 860476A
Authority
GB
United Kingdom
Prior art keywords
infra
phosphor
cathode
red
ultra
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
GB3940958A
Inventor
Michael Duke Dudley
Jack Vernon Shaw
George Christie Turner
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.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB3940958A priority Critical patent/GB860476A/en
Publication of GB860476A publication Critical patent/GB860476A/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
    • H01J29/18—Luminescent screens
    • H01J29/182—Luminescent screens acting upon the lighting-up of the luminescent material other than by the composition of the luminescent material, e.g. by infra red or UV radiation, heating or electric fields

Landscapes

  • Luminescent Compositions (AREA)

Abstract

860,476. Luminescent screens. FERRANTI Ltd. Nov. 20, 1959 [Dec. 8, 1958], No. 39409/58. Class 39(1). A dark-trace cathode-ray tube particularly for use in radar presentation units and oscilloscopes has a double layer phosphor screen, the layer facing the gun comprising an infra-red emitting phosphor and the bottom layer a phosphor which emits light only when irradiated with ultra-violet radiation and in the absence of infra-red radiation. The source of the ultra-violet radiation is an ultra-violet lamp. The infra-red emitting phosphor may consist of zinc cadmium sulphide activated with silver, and the infra-red quenched phosphor of zinc sulphide activated with copper and cobalt. A third layer of transparent silica impervious to electrons but transparent to infra-red radiation may be disposed between the two phosphor layers.
GB3940958A 1958-12-08 1958-12-08 Improvements relating to cathode-ray tube systems and to cathode-ray tubes for use th Expired GB860476A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3940958A GB860476A (en) 1958-12-08 1958-12-08 Improvements relating to cathode-ray tube systems and to cathode-ray tubes for use th

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3940958A GB860476A (en) 1958-12-08 1958-12-08 Improvements relating to cathode-ray tube systems and to cathode-ray tubes for use th

Publications (1)

Publication Number Publication Date
GB860476A true GB860476A (en) 1961-02-08

Family

ID=10409388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3940958A Expired GB860476A (en) 1958-12-08 1958-12-08 Improvements relating to cathode-ray tube systems and to cathode-ray tubes for use th

Country Status (1)

Country Link
GB (1) GB860476A (en)

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