GB929618A - Improvements in or relating to multiple-groove discharge lamps - Google Patents

Improvements in or relating to multiple-groove discharge lamps

Info

Publication number
GB929618A
GB929618A GB11039/59A GB1103959A GB929618A GB 929618 A GB929618 A GB 929618A GB 11039/59 A GB11039/59 A GB 11039/59A GB 1103959 A GB1103959 A GB 1103959A GB 929618 A GB929618 A GB 929618A
Authority
GB
United Kingdom
Prior art keywords
grooves
envelope
wall
pressure
groove
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
GB11039/59A
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.)
General Electric Co
Original Assignee
General Electric Co
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 US734569A external-priority patent/US2973447A/en
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB929618A publication Critical patent/GB929618A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/30Vessels; Containers
    • H01J61/33Special shape of cross-section, e.g. for producing cool spot

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)

Abstract

929,618. Discharge lamps. GENERAL ELECTRIC CO. April 1, 1959 [April 18, 1958; May 12, 1958 (2)], No. 11039/59. Class 39 (1). A low-pressure discharge lamp, such as a fluorescent lamp, comprises an elongated vitreous envelope 2 having electrodes 6 sealed into opposite ends and containing an inert starting gas and a metal vapour, the envelope having a generally circular cylindrical boundary and a plurality of relatively short longitudinallyextending channel-shaped grooves 10, 11 alternately arranged on opposite sides of the envelope and forming a generally kidney-shaped cross-section at least at the centre portions of the grooves, wherein the groove throw A is between <SP>2</SP>/ 3 and <SP>3</SP>/ 2 of the diameter of the envelope boundary, and wherein the grooves have slanting end walls in a longitudinal direction to form a generally sinusoidal discharge path, the width of this path, measured in the medial plane of the grooves, being such that the wall-to-wall spacing C measured between the slanting end walls of two adjacent grooves is in the range of 60-150% of the wall-to-wall spacing D in the grooved portions of the envelope. The wall-to-wall spacing C can be approximately 80% of the wall-to-wall spacing D and the groove throw A can be approximately equal to the diameter of the envelope boundary. The channel-shaped grooves can have, in a transverse plane, a generally rounded crosssection, Fig. 3, with an aperture angle B of at least 90 degrees, preferably 100 degrees. The slanting end walls of the grooves can be curved in cross-section, as shown at 15a, 16a in Fig. 4a, or substantially straight, as shown at 15b and 16b in Fig. 4b. At least one of the grooves can be asymmetrically located with respect to the diametral plane through the longitudinal axis of the envelope to provide a wider rail portion 13<SP>1</SP>, Fig. 5, on one side and a narrower rail portion 14<SP>1</SP> on the other side, thus producing regions of different operating temperature. Two differently asymmetrically located grooves can be provided of which one is displaced to one side and the other is displaced to the opposite side of the diametral plane and can be located near the centre of the envelope and three grooves throws apart. At least one of the grooves 10<SP>11</SP>, 11<SP>11</SP>, Fig. 7, can be provided with an upstanding narrow fin 25, 26 extending outwardly from the bottom wall of the groove to provide a constricted zone within the envelope. Alternatively a depression or short indentation can be provided in the bottom or inner wall of one or more of the grooves and project inwardly into the envelope space, preferably to one side of the medial plane of the groove. The starting gas can be one or more of the inert rare gases, e.g. argon at a pressure of 0.5-5 mm., or a mixture of argon and not over approximately 50% neon or helium within this pressure range. Preferably argon at a pressure of 1.4 mm. together with mercury at a partial pressure of 1-20 microns, preferably 6 microns, are used. Krypton and xenon are also referred to as starting gases. A phosphor coating 8 of alkaline earth halophosphate is provided on the inside of the envelope. Specifications 802,877 and 821,321 are referred to.
GB11039/59A 1958-04-18 1959-04-01 Improvements in or relating to multiple-groove discharge lamps Expired GB929618A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US729425A US2965789A (en) 1958-04-18 1958-04-18 Vapor pressure control in discharge lamps
US73451158A 1958-05-12 1958-05-12
US734569A US2973447A (en) 1958-05-12 1958-05-12 Grooved lamp vapor pressure control

Publications (1)

Publication Number Publication Date
GB929618A true GB929618A (en) 1963-06-26

Family

ID=27419131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11039/59A Expired GB929618A (en) 1958-04-18 1959-04-01 Improvements in or relating to multiple-groove discharge lamps

Country Status (5)

Country Link
US (1) US2965789A (en)
DE (1) DE1123047B (en)
FR (2) FR75582E (en)
GB (1) GB929618A (en)
NL (1) NL238268A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182199A (en) * 1985-09-28 1987-05-07 Toshiba Kk A fluorescent lamp device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121183A (en) * 1960-08-31 1964-02-11 Duro Test Corp Fluorescent lamp
US3331977A (en) * 1965-03-15 1967-07-18 Westinghouse Electric Corp High output discharge lamp with vapor pressure control means
FR2108916B1 (en) * 1970-10-13 1973-11-30 Gerland Ste Chimique
WO2003085695A2 (en) * 2002-04-11 2003-10-16 Koninklijke Philips Electronics N.V. Low-pressure mercury vapor discharge lamp
US7276853B2 (en) 2002-04-11 2007-10-02 Koninklijke Philips Electronics, N.V. Low-pressure mercury vapor discharge lamp
DE10391495D2 (en) * 2002-04-17 2005-02-24 Continental Teves Ag & Co Ohg Method of detecting tire properties
AU2003260931A1 (en) * 2002-10-04 2004-04-23 Koninklijke Philips Electronics N.V. Low-pressure mercury vapour discharge lamp

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2020726A (en) * 1932-10-01 1935-11-12 Gen Electric Gaseous electric discharge device
US2213245A (en) * 1935-12-23 1940-09-03 Germer Edmund Electrical discharge device
FR802714A (en) * 1936-02-12 1936-09-14 Improvements to luminescent tubes
US2190009A (en) * 1937-05-22 1940-02-13 Boucher Inv S Ltd Luminescent tube and system
FR861799A (en) * 1938-11-26 1941-02-17 Lampes Sa Improvements to light discharge devices
US2317265A (en) * 1940-07-26 1943-04-20 Foerste William Fluorescent lamp
ES173962A1 (en) * 1944-12-21 1946-07-16 The General Electric Company Ltd AN ELECTRIC SHOCK LAMP
AT199750B (en) * 1954-12-14 1958-09-25 Gen Electric Discharge lamp
BE556663A (en) * 1954-12-14

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182199A (en) * 1985-09-28 1987-05-07 Toshiba Kk A fluorescent lamp device
US4746835A (en) * 1985-09-28 1988-05-24 Kabushiki Kaisha Toshiba Fluorescent lamp device having oval cross sectional tubes
GB2182199B (en) * 1985-09-28 1990-03-21 Toshiba Kk Fluorescent lamp device

Also Published As

Publication number Publication date
DE1123047B (en) 1962-02-01
FR75582E (en) 1961-07-17
NL238268A (en)
US2965789A (en) 1960-12-20
FR75708E (en) 1961-08-04

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