GB353394A - Improvements in light sensitive electric discharge devices - Google Patents

Improvements in light sensitive electric discharge devices

Info

Publication number
GB353394A
GB353394A GB1744/30A GB174430A GB353394A GB 353394 A GB353394 A GB 353394A GB 1744/30 A GB1744/30 A GB 1744/30A GB 174430 A GB174430 A GB 174430A GB 353394 A GB353394 A GB 353394A
Authority
GB
United Kingdom
Prior art keywords
magnesium
metal
cathode
barium
disc
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
GB1744/30A
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Publication of GB353394A publication Critical patent/GB353394A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Gyroscopes (AREA)
  • Lasers (AREA)

Abstract

353,394. Photo-electric cells. ASSOCIATED ELECTRICAL INDUSTRIES, Ltd., Bush House, Aldwych, London.-(Assignees of Knowles, D. D.; 194, Castlegate Road, Wilkinsburg, Pennsylvania, U.S.A.) Jan. 17, 1930, No. 1744. Convention date, Jan. 18, 1929. Void Published under Sect. 91 of the Acts]. [Class 39 (i).] A photo-electric cell has a cathode consisting of a thin layer of an alkali metal or barium on a layer of magnesium, an alkalineearth metal, misch metal, silver, or silver oxide, and a filling of a noble gas such as helium. A cathode consisting of a layer of barium on magnesium has maximum sensitivity in the red region of the spectrum ; by substituting caesium for barium the maximum is displaced towards the blue-green region, and by using rubidium, potassium or sodium as the surface layer the maximum is moved towards the ultra-violet region. Lithium or two or more alkali metals may be used. The lead 2 for the cathode 8 has an extension carrying a disc 4 on which a piece of magnesium 5 is welded. After evacuation of the envelope, the disc is treated by high frequency current and the magnesium is vaporized and deposited on the wall. Alkali metal may be introduced by heating a tube containing the metal; or caesium trinitride may be painted on a part of the disc 4 removed from the magnesium ; or a salt of the alkali metal may be heated by bombardment. The anode 3 consists of a wire enclosed by a glass sleeve 6, the area of the cathode being at least 10 times the active area of the anode.
GB1744/30A 1929-01-18 1930-01-17 Improvements in light sensitive electric discharge devices Expired GB353394A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US353394XA 1929-01-18 1929-01-18
US333389A US1955335A (en) 1929-01-18 1929-01-18 Photoglow tube

Publications (1)

Publication Number Publication Date
GB353394A true GB353394A (en) 1931-07-23

Family

ID=26712007

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1744/30A Expired GB353394A (en) 1929-01-18 1930-01-17 Improvements in light sensitive electric discharge devices

Country Status (2)

Country Link
US (1) US1955335A (en)
GB (1) GB353394A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434622A (en) * 1942-09-24 1948-01-13 Gen Electric Light sensitive electric discharge device
US2537225A (en) * 1947-04-22 1951-01-09 Continental Electric Company Photoelectric tube and method of manufacture
US2685531A (en) * 1948-06-28 1954-08-03 Gen Electric Light-sensitive electron-emissive electrode
BE521169A (en) * 1948-12-03
US2688648A (en) * 1951-01-10 1954-09-07 Oran T Mcilvaine Electron-generating element for pilot flame safety controls
US2764709A (en) * 1952-11-10 1956-09-25 Oran T Mcilvaine Electronic noise generator
YU286278A (en) * 1978-12-07 1983-12-31 Esref Halilovic Photoactive ionizing high-voltage pulsator of a system for starting engines having carburetors

Also Published As

Publication number Publication date
US1955335A (en) 1934-04-17

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