GB1178052A - A Noiseless Discharge Tube - Google Patents

A Noiseless Discharge Tube

Info

Publication number
GB1178052A
GB1178052A GB1671967A GB1671967A GB1178052A GB 1178052 A GB1178052 A GB 1178052A GB 1671967 A GB1671967 A GB 1671967A GB 1671967 A GB1671967 A GB 1671967A GB 1178052 A GB1178052 A GB 1178052A
Authority
GB
United Kingdom
Prior art keywords
oxides
mixture
emissive
tube
borides
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
GB1671967A
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.)
Matsushita Electronics Corp
Original Assignee
Matsushita Electronics Corp
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
Priority to JP2563166 priority Critical
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Publication of GB1178052A publication Critical patent/GB1178052A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/04Electrodes; Screens; Shields
    • H01J61/06Main electrodes
    • H01J61/073Main electrodes for high-pressure discharge lamps
    • H01J61/0735Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0737Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material

Abstract

1,178,052. Cathode materials and processing. MATSUSHITA ELECTRONICS CORP. 12 April, 1967 [20 April, 1966], No. 16719/67. Heading H1D. A discharge tube, more especially a low pressure Hg fluorescent lamp, has cathodes coated with emissive material comprising the oxides of Ba, Sr and Ca together with, in a proportion of from 0À05-10% by weight of the oxides, a substance having the composition of: {(1-x)Fe : xCo} 2 By where 0À15 # x #0À6 and 1 # y # 1À15, i.e. consisting principally of Fe-Co borides, the mixture of borides and 0 xides further containing, in a proportion of from 1-8% by weight of the oxides, one or more of the high melting point metals selected from the group comprising Zr, Hf, Nb and Ta. Initially, with the oxides present as carbonates, the emissive mixture may be suspended in a butyl acetate solution of nitrocellulose and applied to double or triple W coil supports and the resulting coated coils may then be heated during the degassing of the tube to convert the carbonates to oxides. Fluorescent lamps incorporating such cathodes reduce the interference noise to 15dB or less and the blackening of the tube envelope is held at an acceptable level. A number of specific examples of the composition of the emissive mixture are given.
GB1671967A 1966-04-20 1967-04-12 A Noiseless Discharge Tube Expired GB1178052A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2563166 1966-04-20

Publications (1)

Publication Number Publication Date
GB1178052A true GB1178052A (en) 1970-01-14

Family

ID=12171199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1671967A Expired GB1178052A (en) 1966-04-20 1967-04-12 A Noiseless Discharge Tube

Country Status (5)

Country Link
US (1) US3427492A (en)
BE (1) BE697244A (en)
DE (1) DE1589231B2 (en)
GB (1) GB1178052A (en)
NL (1) NL146637B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505553A (en) * 1966-05-12 1970-04-07 Philips Corp Radio-interference-free low-pressure mercury-vapor lamp
US5834895A (en) * 1990-10-25 1998-11-10 Fusion Lighting, Inc. Visible lamp including selenium

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473358A (en) * 1946-08-23 1949-06-14 Raytheon Mfg Co Cathode coating for electron discharge devices
US2820920A (en) * 1952-09-17 1958-01-21 Claude Ets Manufacture of coated electrodes
BE526330A (en) * 1953-02-09
US2849637A (en) * 1956-02-02 1958-08-26 Weiss Harry Electrode for fluorescent lamp
US3312856A (en) * 1963-03-26 1967-04-04 Gen Electric Rhenium supported metallic boride cathode emitters

Also Published As

Publication number Publication date
DE1589231A1 (en) 1970-09-10
US3427492A (en) 1969-02-11
NL146637B (en) 1975-07-15
DE1589231B2 (en) 1971-09-30
BE697244A (en) 1967-10-02
NL6705394A (en) 1967-10-23

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