GB841343A - Improvements in or relating to low-pressure mercury vapour discharge tubes - Google Patents

Improvements in or relating to low-pressure mercury vapour discharge tubes

Info

Publication number
GB841343A
GB841343A GB31817/58A GB3181758A GB841343A GB 841343 A GB841343 A GB 841343A GB 31817/58 A GB31817/58 A GB 31817/58A GB 3181758 A GB3181758 A GB 3181758A GB 841343 A GB841343 A GB 841343A
Authority
GB
United Kingdom
Prior art keywords
extension
tube
approximately
wall
temperature
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
GB31817/58A
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 Electrical Industries Ltd
Original Assignee
Philips 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB841343A publication Critical patent/GB841343A/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
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

841,343. Discharge lamps. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 6, 1958 [Oct. 9, 1957], No. 31817/58. Addition to 835,183. Class 39(1). A low pressure mercury vapour discharge tube 1, preferably fluorescent, which in operation has a lowest external wall temperature of from 30‹C to 45‹C and a wall loading exceeding 50 mWs. per sq. cm., comprises at least one wall extension 5 intermediate the alkalineearth activated thermionic electrodes 4 and containing mercury 6, the radial size of the extension exceeding 20% of the radius of the tube and each electrode being surrounded by a chrome-iron disintegration screen ring 8, which is insulated from it. The screens 8 can contain from 15 to 35% by weight of chromium, preferably 24%. The extension 5 may be annular as indicated at 7. The rings 8 are supported from the pinches 2 by stay wires 9. The tube can have a filling of argon at approximately 0À8 mms. pressure and the wall loading can be approximately 74 mWs. per sq. cm., the temperature of the tip of the extension 5 being approximately 38‹C. The tube 1 can be provided with a layer of luminescent halogen phosphate with a colour temperature of about 4200‹C.
GB31817/58A 1957-10-09 1958-10-06 Improvements in or relating to low-pressure mercury vapour discharge tubes Expired GB841343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL841343X 1957-10-09

Publications (1)

Publication Number Publication Date
GB841343A true GB841343A (en) 1960-07-13

Family

ID=19845015

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31817/58A Expired GB841343A (en) 1957-10-09 1958-10-06 Improvements in or relating to low-pressure mercury vapour discharge tubes

Country Status (1)

Country Link
GB (1) GB841343A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001344A1 (en) * 1979-11-07 1981-05-14 Lumalampan Ab Cathode unit for fluorescent tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001344A1 (en) * 1979-11-07 1981-05-14 Lumalampan Ab Cathode unit for fluorescent tube

Similar Documents

Publication Publication Date Title
GB1319063A (en) Method of introducing mercury into a gas discharge tube and tube produced by a process involving this method
GB1042183A (en) Mercury vapour discharge lamps
GB841343A (en) Improvements in or relating to low-pressure mercury vapour discharge tubes
GB854751A (en) Improvements in or relating to high-pressure electric discharge tubes
ES399456A1 (en) High pressure mercury vapour discharge lamp
GB1042266A (en) Gaseous cold cathode indicator tube
US2840751A (en) Electrode coating composition and electrode for cold cathode gas discharge lamp
GB835183A (en) Improvements in or relating to low-pressure mercury vapour discharge tubes
US2176134A (en) Electric gaseous discharge device
GB698452A (en) Improvements in electrical discharge lamps
GB952600A (en) Improvements in low pressure mercury vapour discharge lamps
GB644409A (en) Improvements in electric discharge lamps
GB863467A (en) Improvements in or relating to low pressure electric discharge lamps
GB725685A (en) Improvements in or relating to cold-cathode gas-discharge tubes
GB866466A (en) Improvements in or relating to electric discharge lamps
US2939985A (en) Low-pressure mercury vapour discharge tube
GB790959A (en) Improvements in or relating to low-pressure arc discharge tubes
US2182778A (en) Gaseous electric discharge device
GB937391A (en) Cold-cathode glow-discharge tubes
US1972647A (en) Electric glow discharge tube
GB644462A (en) Improvements in or relating to glow lamps
GB1035593A (en) Improvements in or relating to low-pressure mercury vapour discharge lamps
GB1329929A (en) Electric discharge vessels
GB926045A (en) Improvements in or relating to high pressure mercury vapour electric discharge lamps
GB794285A (en) Improvements in or relating to low pressure mercury vapour electric discharge lamps