GB1191463A - Improvements relating to Low-Pressure Mercury Vapour Discharge Lamps - Google Patents

Improvements relating to Low-Pressure Mercury Vapour Discharge Lamps

Info

Publication number
GB1191463A
GB1191463A GB21428/67A GB2142867A GB1191463A GB 1191463 A GB1191463 A GB 1191463A GB 21428/67 A GB21428/67 A GB 21428/67A GB 2142867 A GB2142867 A GB 2142867A GB 1191463 A GB1191463 A GB 1191463A
Authority
GB
United Kingdom
Prior art keywords
mixture
boride
pressure mercury
low
mercury vapour
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
GB21428/67A
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 GB1191463A publication Critical patent/GB1191463A/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)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Luminescent Compositions (AREA)

Abstract

1,191,463. Cathode materials. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 9 May, 1967 [12 May, 1966; 15 Oct., 1966], No. 21428/67. Heading H1D. A low-pressure mercury vapour lamp stated to give rise to reduced interference radiation, includes two thermionic electrodes, each of which consists of a support coated with a mixture which includes an electron emission material consisting of at least one alkaline earth metal oxide and a boride of a metal of the lanthanide or actinide series or of the second, fourth, fifth or seventh groups of the Periodic Table, the quantity of boride lying in the range 0À1 to 15%-and preferably in the range of 0À1 to 7%-by weight of the alkaline earth metal oxide. The borides of Ca, La, Ce, Pr, Sm, U, Zr, V, Ta and Mn are specifically referred to, the grain size of the boride particles 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 1 to 5% by weight of the electronic emissive material. A mixture of the 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.
GB21428/67A 1966-05-12 1967-05-09 Improvements relating to Low-Pressure Mercury Vapour Discharge Lamps Expired GB1191463A (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
GB1191463A true GB1191463A (en) 1970-05-13

Family

ID=26644037

Family Applications (2)

Application Number Title Priority Date Filing Date
GB21427/67A Expired GB1193864A (en) 1966-05-12 1967-05-09 Improvements relating to Low-Pressure Mercury-Vapour Discharge Lamps
GB21428/67A Expired GB1191463A (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
GB21427/67A Expired GB1193864A (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) ES340339A1 (en)
FR (2) FR1522814A (en)
GB (2) GB1193864A (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
EP0270083A2 (en) * 1986-12-02 1988-06-08 Hitachi, Ltd. Low-pressure discharge lamp

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321503A (en) * 1978-11-06 1982-03-23 Westinghouse Electric Corp. HID Lamp electrode comprising barium-calcium niobate or tantalate
DE3715375C1 (en) * 1987-05-08 1988-10-13 Heraeus Gmbh W C Hydrogen 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
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
EP0738423B1 (en) * 1994-11-08 1999-01-13 Koninklijke 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
NL80503C (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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0270083A2 (en) * 1986-12-02 1988-06-08 Hitachi, Ltd. Low-pressure discharge lamp
EP0270083A3 (en) * 1986-12-02 1990-06-27 Hitachi, Ltd. Low-pressure discharge lamp

Also Published As

Publication number Publication date
DE1589248A1 (en) 1970-04-30
FR1522814A (en) 1968-04-26
ES340339A1 (en) 1968-06-01
FR1522815A (en) 1968-04-26
NO118120B (en) 1969-11-10
DE1589247A1 (en) 1970-04-09
DE1589247B2 (en) 1976-04-15
CH490732A (en) 1970-05-15
AT279735B (en) 1970-03-10
BE698366A (en) 1967-11-13
US3505553A (en) 1970-04-07
DE1589248B2 (en) 1976-04-15
GB1193864A (en) 1970-06-03
CH464354A (en) 1968-10-31
BE698451A (en) 1967-11-13
ES340338A1 (en) 1968-06-01
SE304558B (en) 1968-09-30
SE305031B (en) 1968-10-14

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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