GB1193864A - Improvements relating to Low-Pressure Mercury-Vapour Discharge Lamps - Google Patents

Improvements relating to Low-Pressure Mercury-Vapour Discharge Lamps

Info

Publication number
GB1193864A
GB1193864A GB21427/67A GB2142767A GB1193864A GB 1193864 A GB1193864 A GB 1193864A GB 21427/67 A GB21427/67 A GB 21427/67A GB 2142767 A GB2142767 A GB 2142767A GB 1193864 A GB1193864 A GB 1193864A
Authority
GB
United Kingdom
Prior art keywords
boron
mixture
electron emissive
tungsten
compound
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
GB21427/67A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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
Priority claimed from NL6606479A external-priority patent/NL6606479A/xx
Priority claimed from NL6614550A external-priority patent/NL6614550A/xx
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1193864A publication Critical patent/GB1193864A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material

Landscapes

  • Discharge Lamp (AREA)
  • Solid Thermionic Cathode (AREA)
  • Luminescent Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

1,193,864. Electrode materials. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 9 May, 1967 [12 May, 1966], No. 21427/67. Heading H1D. A low-pressure mercury-vapour lamp stated to give rise to reduced interference radiation has two thermionic electrodes, each electrode consisting of a support coated with a mixture which includes an electron emissive substance together with elemental boron, or a compound of boron with oxygen, chromium, tungsten, or molybdenum, the electron emissive substance containing at least one alkaline earth metal oxide, and the quantity of boron or boron compound lying in the range 0À1 to 15%-and preferably 0À1 to 10% by weight of the alkaline earth oxide. The compounds boron trioxide, chromium triboride, tungsten monoboride, and molybdenum diboride are specifically referred to, the grain size of the boron or boron compound being not greater than 30, and preferably less than 15, the mean grain size of the electron emissive particles. The mixture may additionally include zirconium in amount from 1 to 5% by weight of the electron emissive substance. A mixture of the boron or boride, zirconium, and an 8: 5: 7 mixture of barium, calcium and strontium carbonates may be coated on a tungsten wire support which is subsequently heated to decompose the carbonates to oxides. Examples of compositions are given.
GB21427/67A 1966-05-12 1967-05-09 Improvements relating to Low-Pressure Mercury-Vapour Discharge Lamps Expired GB1193864A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL6606479A NL6606479A (en) 1966-05-12 1966-05-12
NL6614550A NL6614550A (en) 1966-10-15 1966-10-15

Publications (1)

Publication Number Publication Date
GB1193864A true GB1193864A (en) 1970-06-03

Family

ID=26644037

Family Applications (2)

Application Number Title Priority Date Filing Date
GB21428/67A Expired GB1191463A (en) 1966-05-12 1967-05-09 Improvements relating to Low-Pressure Mercury Vapour Discharge Lamps
GB21427/67A Expired GB1193864A (en) 1966-05-12 1967-05-09 Improvements relating to Low-Pressure Mercury-Vapour Discharge Lamps

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB21428/67A Expired GB1191463A (en) 1966-05-12 1967-05-09 Improvements relating to Low-Pressure Mercury Vapour Discharge Lamps

Country Status (10)

Country Link
US (1) US3505553A (en)
AT (1) AT279735B (en)
BE (2) BE698366A (en)
CH (2) CH490732A (en)
DE (2) DE1589247B2 (en)
ES (2) ES340338A1 (en)
FR (2) FR1522814A (en)
GB (2) GB1191463A (en)
NO (1) NO118120B (en)
SE (2) SE304558B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010742A1 (en) * 1978-11-06 1980-05-14 Westinghouse Electric Corporation H.I.D. lamp electrode comprising barium-calcium niobate or tantalate

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63141252A (en) * 1986-12-02 1988-06-13 Hitachi Ltd Low pressure discharge lamp
US4910431A (en) * 1987-04-24 1990-03-20 W. C. Heraeus Gmbh Hydrogen discharge ultraviolet light source or lamp, and method of its manufacture
DE3715375C1 (en) * 1987-05-08 1988-10-13 Heraeus Gmbh W C Hydrogen discharge lamp
DE3713704A1 (en) * 1987-04-24 1988-11-03 Heraeus Gmbh W C HYDROGEN DISCHARGE LAMP AND METHOD FOR THE PRODUCTION THEREOF
US5391523A (en) * 1993-10-27 1995-02-21 Marlor; Richard C. Electric lamp with lead free glass
US5675214A (en) * 1994-09-21 1997-10-07 U.S. Philips Corporation Low-pressure discharge lamp having hollow electrodes
WO1996014654A1 (en) * 1994-11-08 1996-05-17 Philips Electronics N.V. Low-pressure discharge lamp
US5686789A (en) * 1995-03-14 1997-11-11 Osram Sylvania Inc. Discharge device having cathode with micro hollow array
JPH103879A (en) * 1996-06-12 1998-01-06 Tdk Corp Ceramic cathode fluorescent lamp
US5856726A (en) * 1996-03-15 1999-01-05 Osram Sylvania Inc. Electric lamp with a threaded electrode
US6713950B2 (en) 2001-08-22 2004-03-30 General Electric Company Low volatility slurry for emission mix powder

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE502232A (en) * 1950-03-31
US2878411A (en) * 1955-03-21 1959-03-17 Chromatic Television Lab Inc Color television display screen
US2959702A (en) * 1958-07-02 1960-11-08 Westinghouse Electric Corp Lamp and mount
US3027480A (en) * 1958-12-15 1962-03-27 Raytheon Co Electron discharge device cathodes
GB1015840A (en) * 1964-09-08 1966-01-05 Standard Telephones Cables Ltd Thermionic valves
GB1178052A (en) * 1966-04-20 1970-01-14 Matsushita Electronics Corp A Noiseless Discharge Tube
GB1178051A (en) * 1966-04-20 1970-01-14 Matsushita Electronics Corp Noiseless Discharge Tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010742A1 (en) * 1978-11-06 1980-05-14 Westinghouse Electric Corporation H.I.D. lamp electrode comprising barium-calcium niobate or tantalate

Also Published As

Publication number Publication date
US3505553A (en) 1970-04-07
CH490732A (en) 1970-05-15
ES340339A1 (en) 1968-06-01
FR1522815A (en) 1968-04-26
ES340338A1 (en) 1968-06-01
DE1589248B2 (en) 1976-04-15
SE304558B (en) 1968-09-30
FR1522814A (en) 1968-04-26
SE305031B (en) 1968-10-14
BE698451A (en) 1967-11-13
NO118120B (en) 1969-11-10
GB1191463A (en) 1970-05-13
CH464354A (en) 1968-10-31
DE1589247A1 (en) 1970-04-09
DE1589247B2 (en) 1976-04-15
DE1589248A1 (en) 1970-04-30
AT279735B (en) 1970-03-10
BE698366A (en) 1967-11-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee